libmemif: introduce 'memif_per_thread_' namespace

APIs in 'memif_per_thread_' namespace are used to split the global
database into separate databases, to improve multi-thread use cases.

Using 'memif_per_thread_init' client can create separate libmemif
databases (libmemif_main_t). Client will reference these databases
using memif_per_thread_handle_t. Each database requires unique socket.
Created interface will be stored in the same database as the socket
passed in connection arguments.

Example code: extras/libmemif/examples/icmp_responder_3-1/main.c

Type: feature

Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
Change-Id: I261563ecc34761a76e94f20c20015394398ddfd7
Signed-off-by: Jakub Grajciar <jgrajcia@cisco.com>
(cherry picked from commit 17f2a7bbf25f54dbd71aa8f377875828b7b88e35)

9 files changed, 1314 insertions, 113 deletions

diff --git a/extras/libmemif/examples/CMakeLists.txt b/extras/libmemif/examples/CMakeLists.txt
index 52b8f54216d..1cf50002b8a 100644
--- a/extras/libmemif/examples/CMakeLists.txt
+++ b/extras/libmemif/examples/CMakeLists.txt
@@ -22,6 +22,7 @@ list(APPEND EXAMPLES_LIST
   icmp_responder/main.c
   icmp_responder-epoll/main.c
   icmp_responder-mt/main.c
+  icmp_responder-mt_3-1/main.c
   icmp_responder-eb/main.c
   icmp_responder-zero-copy-slave/main.c
 )
@@ -33,4 +34,3 @@ foreach (EXAMPLE_SRC ${EXAMPLES_LIST})
   target_include_directories(${EXECUTABLE} PRIVATE $<BUILD_INTERFACE:${HEADERS_DIR}>)
   target_link_libraries(${EXECUTABLE} ${LIBMEMIF} ${CMAKE_THREAD_LIBS_INIT})
 endforeach()
-
diff --git a/extras/libmemif/examples/icmp_responder-mt_3-1/main.c b/extras/libmemif/examples/icmp_responder-mt_3-1/main.c
new file mode 100644
index 00000000000..a7b11bb1ebc
--- /dev/null
+++ b/extras/libmemif/examples/icmp_responder-mt_3-1/main.c
@@ -0,0 +1,549 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2019 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <getopt.h>
+#include <errno.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <stdbool.h>
+#include <unistd.h>
+
+#include <sys/epoll.h>
+#include <sys/eventfd.h>
+
+#include <libmemif.h>
+#include <icmp_proto.h>
+
+
+#define APP_NAME "ICMP_Responder_mt_v3.1"
+#define IF_NAME  "memif_connection"
+
+#ifdef ICMP_DBG
+#define DBG(...) do {                                               \
+                    printf (APP_NAME":%s:%d: ", __func__, __LINE__);         \
+                    printf (__VA_ARGS__);                           \
+                    printf ("\n");                                  \
+                } while (0)
+#else
+#define DBG(...)
+#endif
+
+#define ICMPR_BUFFER_LENGTH		32
+#define ICMPR_SOCKET_FILENAME_LEN	256
+#define ICMPR_MEMIF_BUFFER_NUM		256
+
+static struct option options[] = {
+  {"threads", required_argument, 0, 't'},
+  {"if_num", required_argument, 0, 'i'}
+};
+
+struct memif_connection
+{
+  uint16_t id;			/* unique interface id */
+  bool connected;		/* is connected */
+  struct per_thread_data *ptd;	/* per thread data */
+  memif_conn_handle_t handle;	/* memif connection handle */
+  uint8_t ip_addr[4];		/* ip4 address */
+};
+
+struct per_thread_data
+{
+  bool running;			/* is thread main loop running */
+  uint8_t index;		/* thread index */
+  int epfd;			/* epoll file descriptor */
+  int pcfd;			/* poll cancel file descriptor */
+  uint16_t if_num;		/* number of interfaces on this thread */
+  struct memif_connection *conns;	/* memif connections pool */
+  memif_per_thread_main_handle_t pt_main;	/* memif per thread main handle */
+  memif_socket_handle_t socket_handle;		/* memif socket handle */
+};
+
+struct icmpr_main
+{
+  uint8_t threads;		/* number of threads */
+  uint16_t per_thread_if_num;	/* number of interfaces per thread */
+  struct per_thread_data *ptd;	/* per thread data pool */
+  pthread_t *pthread;		/* thread pool */
+};
+
+struct icmpr_main icmpr_main;
+
+int
+add_epoll_fd (int epfd, int fd, uint32_t events)
+{
+  if (fd < 0)
+    {
+      DBG ("invalid fd %d", fd);
+      return -1;
+    }
+  struct epoll_event evt;
+  memset (&evt, 0, sizeof (evt));
+  evt.events = events;
+  evt.data.fd = fd;
+  if (epoll_ctl (epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
+    {
+      DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
+      return -1;
+    }
+  DBG ("fd %d added to epoll", fd);
+  return 0;
+}
+
+int
+mod_epoll_fd (int epfd, int fd, uint32_t events)
+{
+  if (fd < 0)
+    {
+      DBG ("invalid fd %d", fd);
+      return -1;
+    }
+  struct epoll_event evt;
+  memset (&evt, 0, sizeof (evt));
+  evt.events = events;
+  evt.data.fd = fd;
+  if (epoll_ctl (epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
+    {
+      DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
+      return -1;
+    }
+  DBG ("fd %d moddified on epoll", fd);
+  return 0;
+}
+
+int
+del_epoll_fd (int epfd, int fd)
+{
+  if (fd < 0)
+    {
+      DBG ("invalid fd %d", fd);
+      return -1;
+    }
+  struct epoll_event evt;
+  memset (&evt, 0, sizeof (evt));
+  if (epoll_ctl (epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
+    {
+      DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
+      return -1;
+    }
+  DBG ("fd %d removed from epoll", fd);
+  return 0;
+}
+
+/* Called when libmemif requests an update on any of its file descriptors */
+static int
+control_fd_update (int fd, uint8_t events, void *private_ctx)
+{
+  struct per_thread_data *ptd = (struct per_thread_data *) private_ctx;
+  uint32_t evt = 0;
+
+  if (ptd == NULL)
+    return -1;
+
+  /* convert memif event definitions to epoll events */
+  if (events & MEMIF_FD_EVENT_DEL)
+    return del_epoll_fd (ptd->epfd, fd);
+
+  if (events & MEMIF_FD_EVENT_READ)
+    evt |= EPOLLIN;
+  if (events & MEMIF_FD_EVENT_WRITE)
+    evt |= EPOLLOUT;
+
+  if (events & MEMIF_FD_EVENT_MOD)
+    return mod_epoll_fd (ptd->epfd, fd, evt);
+
+  return add_epoll_fd (ptd->epfd, fd, evt);
+}
+
+static int
+on_connect (memif_conn_handle_t conn, void *private_ctx)
+{
+  struct per_thread_data *ptd = (struct per_thread_data *) private_ctx;
+  struct memif_connection *c;
+  int i = 0;
+
+  while (i < ptd->if_num && ptd->conns[i].handle != conn)
+    i++;
+  c = &ptd->conns[i];
+
+  c->connected = true;
+  DBG ("Connected: %u", c->id);
+
+  memif_refill_queue (conn, 0, -1, 0);
+
+  return 0;
+}
+
+static int
+on_disconnect (memif_conn_handle_t conn, void *private_ctx)
+{
+  struct per_thread_data *ptd = (struct per_thread_data *) private_ctx;
+  struct memif_connection *c;
+  int i = 0;
+
+  while (i < ptd->if_num && ptd->conns[i].handle != conn)
+    i++;
+  c = &ptd->conns[i];
+
+  c->connected = false;
+  DBG ("Disconnected: %u", c->id);
+
+  return 0;
+}
+
+static int
+on_interrupt (memif_conn_handle_t conn, void *private_ctx, uint16_t qid)
+{
+  struct per_thread_data *ptd = (struct per_thread_data *) private_ctx;
+  struct memif_connection *c;
+  memif_buffer_t mbufs[ICMPR_MEMIF_BUFFER_NUM];
+  uint16_t rx = 0;
+  uint16_t tx = 0;
+  uint16_t ret;
+  memif_err_t err;
+  int i = 0;
+
+  memset (mbufs, 0, sizeof (memif_buffer_t) * ICMPR_MEMIF_BUFFER_NUM);
+
+  while (i < ptd->if_num && ptd->conns[i].handle != conn)
+    i++;
+  c = &ptd->conns[i];
+
+  /* receive data from shared memory buffers */
+  err = memif_rx_burst (conn, qid, mbufs, ICMPR_MEMIF_BUFFER_NUM, &rx);
+  if (err != MEMIF_ERR_SUCCESS)
+  {
+    printf ("memif_rx_burst: %s\n", memif_strerror (err));
+    goto error;
+  }
+
+  /* resolve packet in place (zer-copy slave) */
+  for (i = 0; i < rx; i++)
+    resolve_packet2 (mbufs[i].data, &mbufs[i].len, c->ip_addr);
+
+  /* enqueue received buffers */
+  err = memif_buffer_enq_tx (conn, qid, mbufs, i, &tx);
+  if (err != MEMIF_ERR_SUCCESS)
+  {
+    printf ("memif_rx_burst: %s\n", memif_strerror (err));
+    goto error;
+  }
+
+  /* mark shared memory buffers as free */
+  err = memif_refill_queue (conn, qid, rx, 0);
+  if (err != MEMIF_ERR_SUCCESS)
+  {
+    printf ("memif_rx_burst: %s\n", memif_strerror (err));
+    goto error;
+  }
+
+  err = memif_tx_burst (conn, qid, mbufs, tx, &ret);
+  if (err != MEMIF_ERR_SUCCESS)
+  {
+    printf ("memif_rx_burst: %s\n", memif_strerror (err));
+    goto error;
+  }
+
+  return 0;
+
+error:
+  memif_refill_queue (conn, qid, -1, 0);
+  return -1;
+}
+
+int
+poll_event (memif_per_thread_main_handle_t pt_main, int pcfd, int epfd,
+	    int timeout)
+{
+  struct epoll_event evt;
+  int en = 0;
+  uint8_t events = 0;
+  memset (&evt, 0, sizeof (evt));
+  evt.events = EPOLLIN | EPOLLOUT;
+
+  en = epoll_pwait (epfd, &evt, 1, timeout, NULL);
+  if (en < 0)
+    {
+      printf ("epoll_pwait: %s\n", strerror (errno));
+      return -1;
+    }
+
+  if (en > 0)
+    {
+      /* Cancel event polling */
+      if (evt.data.fd == pcfd)
+	return 1;
+
+      if (evt.events & EPOLLIN)
+	events |= MEMIF_FD_EVENT_READ;
+      if (evt.events & EPOLLOUT)
+	events |= MEMIF_FD_EVENT_WRITE;
+      if (evt.events & EPOLLERR)
+	events |= MEMIF_FD_EVENT_ERROR;
+
+      /* No need to use locks, as the database is separated */
+      memif_per_thread_control_fd_handler (pt_main, evt.data.fd, events);
+    }
+
+  return 0;
+}
+
+static void *
+icmpr_thread_fn (void *data)
+{
+  struct per_thread_data *ptd = (struct per_thread_data *) data;
+  int rv;
+  uint16_t i;
+  char socket_filename[ICMPR_SOCKET_FILENAME_LEN] = "/run/vpp/memif";
+  memif_conn_args_t args;
+
+  ptd->epfd = epoll_create (1);
+
+  ptd->conns = malloc (sizeof (struct memif_connection) * ptd->if_num);
+  if (ptd->conns == NULL)
+    {
+      printf ("%s\n", strerror (errno));
+      return NULL;
+    }
+
+  memset (ptd->conns, 0, sizeof (struct memif_connection) * ptd->if_num);
+
+  /* Initialize memif database (per thread). */
+  rv =
+    memif_per_thread_init (&ptd->pt_main, ptd, control_fd_update, APP_NAME,
+			   NULL, NULL, NULL);
+  if (rv != MEMIF_ERR_SUCCESS)
+    {
+      printf ("memif_per_thread_init: %s\n", memif_strerror (rv));
+      return NULL;
+    }
+
+  /*  Create unique socket. Each thread requires uniqueue socket. Interfaces created
+   *  on the same thread can share one socket.
+   */
+  socket_filename[strlen (socket_filename)] = '0' + ptd->index;
+  strncpy (socket_filename + strlen (socket_filename), ".sock", 5);
+  DBG ("socket_filename: %s", socket_filename);
+
+  rv = memif_per_thread_create_socket (ptd->pt_main, &ptd->socket_handle,
+				       socket_filename, ptd);
+  if (rv != MEMIF_ERR_SUCCESS)
+    {
+      printf ("memif_per_thread_create_socket: %s\n", memif_strerror (rv));
+      return NULL;
+    }
+
+  /* Create interfaces on this thread */
+  for (i = 0; i < ptd->if_num; i++)
+    {
+      ptd->conns[i].ip_addr[0] = 192;
+      ptd->conns[i].ip_addr[1] = 168;
+      ptd->conns[i].ip_addr[2] = ptd->index + 1;
+      ptd->conns[i].ip_addr[3] = i * 2 + 2;
+
+      memset (&args, 0, sizeof (args));
+
+      args.socket = ptd->socket_handle;
+      ptd->conns[i].id = i;
+      args.interface_id = i;
+
+      rv = memif_create (&ptd->conns[i].handle, &args, on_connect,
+			 on_disconnect, on_interrupt, ptd);
+      if (rv < 0)
+	{
+	  printf ("%s\n", memif_strerror (rv));
+	  return NULL;
+	}
+    }
+
+  /* Poll cancel file descriptor. When an event is received on this fd, exit thread
+   * loop in respective thread.
+   */
+  ptd->pcfd = eventfd (0, EFD_NONBLOCK);
+  if (ptd->pcfd < 0)
+    {
+      printf ("eventfd: %s\n", strerror (errno));
+      return NULL;
+    }
+  if (add_epoll_fd (ptd->epfd, ptd->pcfd, EPOLLIN) < 0)
+    {
+      printf ("Failed to add poll cancel fd to epfd.");
+      return NULL;
+    }
+
+  /* Thread loop */
+  ptd->running = true;
+  while (ptd->running)
+    {
+      rv = poll_event (ptd->pt_main, ptd->pcfd, ptd->epfd, -1);
+      if (rv != 0)
+	ptd->running = false;
+    }
+
+  /* Clean up */
+  for (i = 0; i < ptd->if_num; i++)
+    memif_delete (&ptd->conns[i].handle);
+
+  memif_delete_socket (&ptd->socket_handle);
+
+  memif_per_thread_cleanup (&ptd->pt_main);
+
+  free (ptd->conns);
+  close (ptd->pcfd);
+
+  return NULL;
+}
+
+static void
+icmpr_print_help ()
+{
+  printf
+    ("exit - Exits the application.\nhelp - Print this help.\nshow - Show memif interfaces\n");
+}
+
+static void
+icmpr_show_memifs ()
+{
+  struct icmpr_main *im = &icmpr_main;
+  int i, j;
+  memif_socket_handle_t sh;
+
+  printf ("%u Threads %u Memifs (per thread)\n", im->threads,
+	  im->per_thread_if_num);
+  printf ("=================================\n");
+
+  for (i = 0; i < im->threads; i++)
+    {
+      sh = im->ptd[i].socket_handle;
+      printf ("Thread %u %s\n", i, memif_get_socket_filename (sh));
+      for (j = 0; j < im->per_thread_if_num; j++)
+	{
+	  printf ("\tMemif id %u\n\t%s\n", im->ptd[i].conns[j].id,
+		  im->ptd[i].conns[j].connected ? "Link up" : "Link down");
+	}
+    }
+}
+
+int
+main (int argc, char **argv)
+{
+  struct icmpr_main *im = &icmpr_main;
+  int rv, i;
+  int option_index = 0;
+  bool running;
+  char buffer[ICMPR_BUFFER_LENGTH];
+  uint64_t b = 1;
+
+  memset (im, 0, sizeof (struct icmpr_main));
+
+  /* Default args */
+  im->threads = 4;
+  im->per_thread_if_num = 1;
+
+  /* Parse args */
+  while ((rv =
+	  getopt_long (argc, argv, "t:i:", options, &option_index)) != (-1))
+    {
+      switch (rv)
+	{
+	case 't':
+	  im->threads = strtoul (optarg, NULL, 10);
+	  break;
+	case 'i':
+	  im->per_thread_if_num = strtoul (optarg, NULL, 10);
+	  break;
+	default:
+	  break;
+	}
+    }
+
+  /* Check args */
+  if (im->threads < 1)
+    {
+      printf ("threads < 1\n");
+      exit (EXIT_FAILURE);
+    }
+
+  if (im->per_thread_if_num < 1)
+    {
+      printf ("if_num < 1\n");
+      exit (EXIT_FAILURE);
+    }
+
+  /* Allocate memory */
+  im->ptd = malloc (sizeof (struct per_thread_data) * im->threads);
+  if (im->ptd == NULL)
+    {
+      printf ("%s\n", strerror (errno));
+      return -1;
+    }
+  im->pthread = malloc (sizeof (pthread_t) * im->threads);
+  if (im->pthread == NULL)
+    {
+      printf ("%s\n", strerror (errno));
+      return -1;
+    }
+
+  /* Initialize and create threads */
+  for (i = 0; i < im->threads; i++)
+    {
+      im->ptd[i].index = i;
+      im->ptd[i].if_num = im->per_thread_if_num;
+      pthread_create (&im->pthread[i], NULL, icmpr_thread_fn, &im->ptd[i]);
+    }
+
+  icmpr_print_help ();
+
+  /* Main loop */
+  running = true;
+  while (running)
+    {
+      printf ("cmd: ");
+      memset (buffer, 0, ICMPR_BUFFER_LENGTH);
+      if (fgets (buffer, ICMPR_BUFFER_LENGTH, stdin) != buffer)
+	{
+	  printf ("%s\n", strerror (errno));
+	  running = false;
+	}
+
+      if (strncmp (buffer, "exit", 4) == 0)
+	running = false;
+      else if (strncmp (buffer, "help", 4) == 0)
+	icmpr_print_help ();
+      else if (strncmp (buffer, "show", 4) == 0)
+	icmpr_show_memifs ();
+    }
+
+  for (i = 0; i < im->threads; i++)
+    {
+      /* Stop polling */
+      rv = write (im->ptd[i].pcfd, &b, sizeof (b));
+      if (rv < 0)
+	{
+	  printf ("Failed to cancel polling. %s\n", strerror (errno));
+	  exit (EXIT_FAILURE);
+	}
+      pthread_join (im->pthread[i], NULL);
+    }
+
+  free (im->pthread);
+  free (im->ptd);
+
+  return 0;
+}
diff --git a/extras/libmemif/src/libmemif.h b/extras/libmemif/src/libmemif.h
index cdbf04aea0d..609b98a7ba4 100644
--- a/extras/libmemif/src/libmemif.h
+++ b/extras/libmemif/src/libmemif.h
@@ -23,7 +23,7 @@
 #define _LIBMEMIF_H_
 
 /** Libmemif version. */
-#define LIBMEMIF_VERSION "3.0"
+#define LIBMEMIF_VERSION "3.1"
 /** Default name of application using libmemif. */
 #define MEMIF_DEFAULT_APP_NAME "libmemif-app"
 
@@ -96,6 +96,12 @@ typedef enum
 #define MEMIF_FD_EVENT_MOD   (1 << 4)
 /** @} */
 
+/** \brief Memif per thread main handle
+    Pointer of type void, pointing to internal structure.
+    Used to identify internal per thread database.
+*/
+typedef void *memif_per_thread_main_handle_t;
+
 /** \brief Memif connection handle
     pointer of type void, pointing to internal structure
 */
@@ -227,6 +233,24 @@ void memif_register_external_region (memif_add_external_region_t * ar,
 				     memif_del_external_region_t * dr,
 				     memif_get_external_buffer_offset_t * go);
 
+/** \brief Register external region
+    @param pt_main - per thread main handle
+    @param ar - add external region callback
+    @param gr - get external region addr callback
+    @param dr - delete external region callback
+    @param go - get external buffer offset callback (optional)
+*/
+void memif_per_thread_register_external_region (memif_per_thread_main_handle_t
+						pt_main,
+						memif_add_external_region_t *
+						ar,
+						memif_get_external_region_addr_t
+						* gr,
+						memif_del_external_region_t *
+						dr,
+						memif_get_external_buffer_offset_t
+						* go);
+
 /** @} */
 
 /**
@@ -246,7 +270,11 @@ typedef enum
 #endif /* _MEMIF_H_ */
 
 /** \brief Memif connection arguments
-    @param socket - memif socket handle, if NULL default socket will be used
+    @param socket - Memif socket handle, if NULL default socket will be used.
+		    Default socket is only supported in global database (see memif_init).
+		    Custom database does not create a default socket
+		    (see memif_per_thread_init).
+		    Memif connection is stored in the same database as the socket.
     @param secret - otional parameter used as interface autenthication
     @param num_s2m_rings - number of slave to master rings
     @param num_m2s_rings - number of master to slave rings
@@ -465,6 +493,28 @@ int memif_init (memif_control_fd_update_t * on_control_fd_update,
 		char *app_name, memif_alloc_t * memif_alloc,
 		memif_realloc_t * memif_realloc, memif_free_t * memif_free);
 
+/** \brief Memif per thread initialization
+    @param pt_main - per thread main handle
+    @param private_ctx - private context
+    @param on_control_fd_update - if control fd updates inform user to watch new fd
+    @param app_name - application name (will be truncated to 32 chars)
+    @param memif_alloc - cutom memory allocator, NULL = default
+    @param memif_realloc - custom memory reallocation, NULL = default
+    @param memif_free - custom memory free, NULL = default
+
+    Per thread version of memif_init ().
+    Instead of using global database, creates and initializes unique database,
+    identified by 'memif_per_thread_main_handle_t'.
+
+    \return memif_err_t
+*/
+int memif_per_thread_init (memif_per_thread_main_handle_t * pt_main,
+			   void *private_ctx,
+			   memif_control_fd_update_t * on_control_fd_update,
+			   char *app_name, memif_alloc_t * memif_alloc,
+			   memif_realloc_t * memif_realloc,
+			   memif_free_t * memif_free);
+
 /** \brief Memif cleanup
 
     Free libmemif internal allocations.
@@ -473,6 +523,15 @@ int memif_init (memif_control_fd_update_t * on_control_fd_update,
 */
 int memif_cleanup ();
 
+/** \brief Memif per thread cleanup
+    @param pt_main - per thread main handle
+
+    Free libmemif internal allocations and sets the handle to NULL.
+
+    \return memif_err_t
+*/
+int memif_per_thread_cleanup (memif_per_thread_main_handle_t * pt_main);
+
 /** \brief Memory interface create function
     @param conn - connection handle for client app
     @param args - memory interface connection arguments
@@ -521,6 +580,19 @@ int memif_create (memif_conn_handle_t * conn, memif_conn_args_t * args,
 */
 int memif_control_fd_handler (int fd, uint8_t events);
 
+/** \brief Memif per thread control file descriptor handler
+    @param pt_main - per thread main handle
+    @param fd - file descriptor on which the event occured
+    @param events - event type(s) that occured
+
+    Per thread version of memif_control_fd_handler.
+
+    \return memif_err_t
+
+*/
+int memif_per_thread_control_fd_handler (memif_per_thread_main_handle_t
+					 pt_main, int fd, uint8_t events);
+
 /** \brief Memif delete
     @param conn - pointer to memif connection handle
 
@@ -608,6 +680,17 @@ int memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
 */
 int memif_poll_event (int timeout);
 
+/** \brief Memif poll event
+    @param pt_main - per thread main handle
+    @param timeout - timeout in seconds
+
+    Per thread version of memif_poll_event.
+
+    \return memif_err_t
+*/
+int memif_per_thread_poll_event (memif_per_thread_main_handle_t pt_main,
+				 int timeout);
+
 /** \brief Send signal to stop concurrently running memif_poll_event().
 
     The function, however, does not wait for memif_poll_event() to stop.
@@ -622,6 +705,15 @@ int memif_poll_event (int timeout);
 */
 #define MEMIF_HAVE_CANCEL_POLL_EVENT 1
 int memif_cancel_poll_event ();
+/** \brief Send signal to stop concurrently running memif_poll_event().
+    @param pt_main - per thread main handle
+
+    Per thread version of memif_cancel_poll_event.
+
+    \return memif_err_t
+*/
+int memif_per_thread_cancel_poll_event (memif_per_thread_main_handle_t
+					pt_main);
 
 /** \brief Set connection request timer value
     @param timer - new timer value
@@ -633,6 +725,19 @@ int memif_cancel_poll_event ();
 */
 int memif_set_connection_request_timer (struct itimerspec timer);
 
+/** \brief Set connection request timer value
+    @param pt_main - per thread main handle
+    @param timer - new timer value
+
+    Per thread version of memif_set_connection_request_timer
+
+    \return memif_err_t
+*/
+int
+memif_per_thread_set_connection_request_timer (memif_per_thread_main_handle_t
+					       pt_main,
+					       struct itimerspec timer);
+
 /** \brief Send connection request
     @param conn - memif connection handle
 
@@ -656,8 +761,22 @@ int memif_request_connection (memif_conn_handle_t conn);
 
     \return memif_err_t
 */
-int memif_create_socket (memif_socket_handle_t * sock, const char * filename,
-			 void * private_ctx);
+int memif_create_socket (memif_socket_handle_t * sock, const char *filename,
+			 void *private_ctx);
+
+/** \brief Create memif socket
+    @param pt_main - per thread main handle
+    @param sock - socket handle for client app
+    @param filename - path to socket file
+    @param private_ctx - private context
+
+    Per thread version of memif_create_sopcket.
+
+    \return memif_err_t
+*/
+int memif_per_thread_create_socket (memif_per_thread_main_handle_t pt_main,
+				    memif_socket_handle_t * sock,
+				    const char *filename, void *private_ctx);
 
 /** \brief Delete memif socket
     @param sock - socket handle for client app
@@ -669,6 +788,15 @@ int memif_create_socket (memif_socket_handle_t * sock, const char * filename,
 */
 int memif_delete_socket (memif_socket_handle_t * sock);
 
+/** \brief Get socket filename
+    @param sock - socket handle for client app
+
+    Return constant pointer to socket filename.
+
+    \return cosnt char *
+*/
+const char *memif_get_socket_filename (memif_socket_handle_t sock);
+
 /** @} */
 
 #endif /* _LIBMEMIF_H_ */
diff --git a/extras/libmemif/src/main.c b/extras/libmemif/src/main.c
index 42dfeafb247..def51a729f7 100644
--- a/extras/libmemif/src/main.c
+++ b/extras/libmemif/src/main.c
@@ -66,8 +66,6 @@
 #endif /* __x86_x64__ */
 
 libmemif_main_t libmemif_main;
-int memif_epfd;
-int poll_cancel_fd = -1;
 
 static char memif_buf[MAX_ERRBUF_LEN];
 
@@ -236,8 +234,17 @@ memif_syscall_error_handler (int err_code)
   return MEMIF_ERR_SYSCALL;
 }
 
+/* Always valid */
+libmemif_main_t *
+get_libmemif_main (memif_socket_t * ms)
+{
+  if (ms != NULL && ms->lm != NULL)
+    return ms->lm;
+  return &libmemif_main;
+}
+
 static int
-memif_add_epoll_fd (int fd, uint32_t events)
+memif_add_epoll_fd (libmemif_main_t * lm, int fd, uint32_t events)
 {
   if (fd < 0)
     {
@@ -248,7 +255,7 @@ memif_add_epoll_fd (int fd, uint32_t events)
   memset (&evt, 0, sizeof (evt));
   evt.events = events;
   evt.data.fd = fd;
-  if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
+  if (epoll_ctl (lm->epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
     {
       DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
       return -1;
@@ -258,7 +265,7 @@ memif_add_epoll_fd (int fd, uint32_t events)
 }
 
 static int
-memif_mod_epoll_fd (int fd, uint32_t events)
+memif_mod_epoll_fd (libmemif_main_t * lm, int fd, uint32_t events)
 {
   if (fd < 0)
     {
@@ -269,7 +276,7 @@ memif_mod_epoll_fd (int fd, uint32_t events)
   memset (&evt, 0, sizeof (evt));
   evt.events = events;
   evt.data.fd = fd;
-  if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
+  if (epoll_ctl (lm->epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
     {
       DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
       return -1;
@@ -279,7 +286,7 @@ memif_mod_epoll_fd (int fd, uint32_t events)
 }
 
 static int
-memif_del_epoll_fd (int fd)
+memif_del_epoll_fd (libmemif_main_t * lm, int fd)
 {
   if (fd < 0)
     {
@@ -288,7 +295,7 @@ memif_del_epoll_fd (int fd)
     }
   struct epoll_event evt;
   memset (&evt, 0, sizeof (evt));
-  if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
+  if (epoll_ctl (lm->epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
     {
       DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
       return -1;
@@ -300,8 +307,15 @@ memif_del_epoll_fd (int fd)
 int
 memif_control_fd_update (int fd, uint8_t events, void *private_ctx)
 {
+  libmemif_main_t *lm;
+
+  if (private_ctx == NULL)
+    return MEMIF_ERR_INVAL_ARG;
+
+  lm = (libmemif_main_t *) private_ctx;
+
   if (events & MEMIF_FD_EVENT_DEL)
-    return memif_del_epoll_fd (fd);
+    return memif_del_epoll_fd (lm, fd);
 
   uint32_t evt = 0;
   if (events & MEMIF_FD_EVENT_READ)
@@ -310,15 +324,15 @@ memif_control_fd_update (int fd, uint8_t events, void *private_ctx)
     evt |= EPOLLOUT;
 
   if (events & MEMIF_FD_EVENT_MOD)
-    return memif_mod_epoll_fd (fd, evt);
+    return memif_mod_epoll_fd (lm, fd, evt);
 
-  return memif_add_epoll_fd (fd, evt);
+  return memif_add_epoll_fd (lm, fd, evt);
 }
 
 int
-add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
+add_list_elt (libmemif_main_t * lm, memif_list_elt_t * e,
+	      memif_list_elt_t ** list, uint16_t * len)
 {
-  libmemif_main_t *lm = &libmemif_main;
   memif_list_elt_t *tmp;
   int i;
 
@@ -413,9 +427,9 @@ free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
 }
 
 static void
-memif_control_fd_update_register (memif_control_fd_update_t * cb)
+memif_control_fd_update_register (libmemif_main_t * lm,
+				  memif_control_fd_update_t * cb)
 {
-  libmemif_main_t *lm = &libmemif_main;
   lm->control_fd_update = cb;
 }
 
@@ -433,23 +447,20 @@ memif_register_external_region (memif_add_external_region_t * ar,
 }
 
 static void
-memif_alloc_register (memif_alloc_t * ma)
+memif_alloc_register (libmemif_main_t * lm, memif_alloc_t * ma)
 {
-  libmemif_main_t *lm = &libmemif_main;
   lm->alloc = ma;
 }
 
 static void
-memif_realloc_register (memif_realloc_t * mr)
+memif_realloc_register (libmemif_main_t * lm, memif_realloc_t * mr)
 {
-  libmemif_main_t *lm = &libmemif_main;
   lm->realloc = mr;
 }
 
 static void
-memif_free_register (memif_free_t * mf)
+memif_free_register (libmemif_main_t * lm, memif_free_t * mf)
 {
-  libmemif_main_t *lm = &libmemif_main;
   lm->free = mf;
 }
 
@@ -473,6 +484,27 @@ memif_set_connection_request_timer (struct itimerspec timer)
 }
 
 int
+memif_per_thread_set_connection_request_timer (memif_per_thread_main_handle_t
+					       pt_main,
+					       struct itimerspec timer)
+{
+  libmemif_main_t *lm = (libmemif_main_t *) pt_main;
+  int err = MEMIF_ERR_SUCCESS;
+
+  lm->arm = timer;
+
+  /* overwrite timer, if already armed */
+  if (lm->disconn_slaves != 0)
+    {
+      if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
+	{
+	  err = memif_syscall_error_handler (errno);
+	}
+    }
+  return err;
+}
+
+int
 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
 	    memif_alloc_t * memif_alloc, memif_realloc_t * memif_realloc,
 	    memif_free_t * memif_free)
@@ -481,24 +513,25 @@ memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
   libmemif_main_t *lm = &libmemif_main;
   memset (lm, 0, sizeof (libmemif_main_t));
 
+  /* register custom memory management */
   if (memif_alloc != NULL)
     {
-      memif_alloc_register (memif_alloc);
+      memif_alloc_register (lm, memif_alloc);
     }
   else
-    memif_alloc_register (malloc);
+    memif_alloc_register (lm, malloc);
 
   if (memif_realloc != NULL)
     {
-      memif_realloc_register (memif_realloc);
+      memif_realloc_register (lm, memif_realloc);
     }
   else
-    memif_realloc_register (realloc);
+    memif_realloc_register (lm, realloc);
 
   if (memif_free != NULL)
-    memif_free_register (memif_free);
+    memif_free_register (lm, memif_free);
   else
-    memif_free_register (free);
+    memif_free_register (lm, free);
 
   if (app_name != NULL)
     {
@@ -512,20 +545,21 @@ memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
 	       strlen (MEMIF_DEFAULT_APP_NAME));
     }
 
+  lm->poll_cancel_fd = -1;
   /* register control fd update callback */
   if (on_control_fd_update != NULL)
-    memif_control_fd_update_register (on_control_fd_update);
+    memif_control_fd_update_register (lm, on_control_fd_update);
   else
     {
-      memif_epfd = epoll_create (1);
-      memif_control_fd_update_register (memif_control_fd_update);
-      if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
+      lm->epfd = epoll_create (1);
+      memif_control_fd_update_register (lm, memif_control_fd_update);
+      if ((lm->poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
 	{
 	  err = errno;
 	  DBG ("eventfd: %s", strerror (err));
 	  return memif_syscall_error_handler (err);
 	}
-      lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ, NULL);
+      lm->control_fd_update (lm->poll_cancel_fd, MEMIF_FD_EVENT_READ, NULL);
       DBG ("libmemif event polling initialized");
     }
 
@@ -606,6 +640,13 @@ memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
       goto error;
     }
 
+  /* Create default socket */
+  err = memif_create_socket ((memif_socket_handle_t *) &
+			     lm->default_socket,
+			     MEMIF_DEFAULT_SOCKET_PATH, NULL);
+  if (err != MEMIF_ERR_SUCCESS)
+    goto error;
+
   return err;
 
 error:
@@ -613,6 +654,172 @@ error:
   return err;
 }
 
+int
+memif_per_thread_init (memif_per_thread_main_handle_t * pt_main,
+		       void *private_ctx,
+		       memif_control_fd_update_t * on_control_fd_update,
+		       char *app_name, memif_alloc_t * memif_alloc,
+		       memif_realloc_t * memif_realloc,
+		       memif_free_t * memif_free)
+{
+  memif_err_t err = MEMIF_ERR_SUCCESS;
+  int i;
+  libmemif_main_t *lm;
+
+  /* Allocate unique libmemif main */
+  if (memif_alloc != NULL)
+    lm = memif_alloc (sizeof (libmemif_main_t));
+  else
+    lm = malloc (sizeof (libmemif_main_t));
+
+  if (lm == NULL)
+    return MEMIF_ERR_NOMEM;
+
+  memset (lm, 0, sizeof (libmemif_main_t));
+
+  /* register custom memory management */
+  if (memif_alloc != NULL)
+    {
+      memif_alloc_register (lm, memif_alloc);
+    }
+  else
+    memif_alloc_register (lm, malloc);
+
+  if (memif_realloc != NULL)
+    {
+      memif_realloc_register (lm, memif_realloc);
+    }
+  else
+    memif_realloc_register (lm, realloc);
+
+  if (memif_free != NULL)
+    memif_free_register (lm, memif_free);
+  else
+    memif_free_register (lm, free);
+
+  lm->private_ctx = private_ctx;
+
+  /* set app name */
+  if (app_name != NULL)
+    {
+      uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
+	? strlen (app_name) : MEMIF_NAME_LEN;
+      strncpy ((char *) lm->app_name, app_name, len);
+    }
+  else
+    {
+      strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
+	       strlen (MEMIF_DEFAULT_APP_NAME));
+    }
+
+  lm->poll_cancel_fd = -1;
+  /* register control fd update callback */
+  if (on_control_fd_update != NULL)
+    memif_control_fd_update_register (lm, on_control_fd_update);
+  else
+    {
+      lm->epfd = epoll_create (1);
+      memif_control_fd_update_register (lm, memif_control_fd_update);
+      if ((lm->poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
+	{
+	  err = errno;
+	  DBG ("eventfd: %s", strerror (err));
+	  return memif_syscall_error_handler (err);
+	}
+      lm->control_fd_update (lm->poll_cancel_fd, MEMIF_FD_EVENT_READ,
+			     lm->private_ctx);
+      DBG ("libmemif event polling initialized");
+    }
+
+  /* Initialize lists */
+  lm->control_list_len = 2;
+  lm->interrupt_list_len = 2;
+  lm->socket_list_len = 1;
+  lm->pending_list_len = 1;
+
+  lm->control_list =
+    lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
+  if (lm->control_list == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+  lm->interrupt_list =
+    lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
+  if (lm->interrupt_list == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+  lm->socket_list =
+    lm->alloc (sizeof (memif_list_elt_t) * lm->socket_list_len);
+  if (lm->socket_list == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+  lm->pending_list =
+    lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
+  if (lm->pending_list == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+
+  for (i = 0; i < lm->control_list_len; i++)
+    {
+      lm->control_list[i].key = -1;
+      lm->control_list[i].data_struct = NULL;
+    }
+  for (i = 0; i < lm->interrupt_list_len; i++)
+    {
+      lm->interrupt_list[i].key = -1;
+      lm->interrupt_list[i].data_struct = NULL;
+    }
+  for (i = 0; i < lm->socket_list_len; i++)
+    {
+      lm->socket_list[i].key = -1;
+      lm->socket_list[i].data_struct = NULL;
+    }
+  for (i = 0; i < lm->pending_list_len; i++)
+    {
+      lm->pending_list[i].key = -1;
+      lm->pending_list[i].data_struct = NULL;
+    }
+
+  /* Initialize autoconnect */
+  lm->disconn_slaves = 0;
+
+  lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
+  if (lm->timerfd < 0)
+    {
+      err = memif_syscall_error_handler (errno);
+      goto error;
+    }
+
+  lm->arm.it_value.tv_sec = MEMIF_DEFAULT_RECONNECT_PERIOD_SEC;
+  lm->arm.it_value.tv_nsec = MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC;
+  lm->arm.it_interval.tv_sec = MEMIF_DEFAULT_RECONNECT_PERIOD_SEC;
+  lm->arm.it_interval.tv_nsec = MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC;
+
+  if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ,
+			     lm->private_ctx) < 0)
+    {
+      DBG ("callback type memif_control_fd_update_t error!");
+      err = MEMIF_ERR_CB_FDUPDATE;
+      goto error;
+    }
+
+  *pt_main = lm;
+
+  return err;
+
+error:
+  *pt_main = lm;
+  memif_per_thread_cleanup (pt_main);
+  return err;
+}
+
 static inline memif_ring_t *
 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
 		uint16_t ring_num)
@@ -649,7 +856,7 @@ memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
 static int
 memif_socket_start_listening (memif_socket_t * ms)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (ms);
   memif_list_elt_t elt;
   struct stat file_stat;
   struct sockaddr_un un = { 0 };
@@ -703,7 +910,7 @@ memif_socket_start_listening (memif_socket_t * ms)
   /* add socket to libmemif main */
   elt.key = ms->fd;
   elt.data_struct = ms;
-  add_list_elt (&elt, &lm->socket_list, &lm->socket_list_len);
+  add_list_elt (lm, &elt, &lm->socket_list, &lm->socket_list_len);
   lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ, ms->private_ctx);
 
   ms->type = MEMIF_SOCKET_TYPE_LISTENER;
@@ -799,12 +1006,96 @@ error:
 }
 
 int
+memif_per_thread_create_socket (memif_per_thread_main_handle_t pt_main,
+				memif_socket_handle_t * sock,
+				const char *filename, void *private_ctx)
+{
+  libmemif_main_t *lm = (libmemif_main_t *) pt_main;
+  memif_socket_t *ms = (memif_socket_t *) * sock;
+  int i, err = MEMIF_ERR_SUCCESS;
+
+  if (lm == NULL)
+    return MEMIF_ERR_INVAL_ARG;
+
+  for (i = 0; i < lm->socket_list_len; i++)
+    {
+      if ((ms = (memif_socket_t *) lm->socket_list[i].data_struct) != NULL)
+	{
+	  if (strncmp ((char *) ms->filename, filename,
+		       strlen ((char *) ms->filename)) == 0)
+	    return MEMIF_ERR_INVAL_ARG;
+	}
+    }
+
+  /* allocate memif_socket_t */
+  ms = NULL;
+  ms = lm->alloc (sizeof (memif_socket_t));
+  if (ms == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+  memset (ms, 0, sizeof (memif_socket_t));
+  ms->lm = lm;
+  /* set filename */
+  ms->filename = lm->alloc (strlen (filename) + sizeof (char));
+  if (ms->filename == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+  memset (ms->filename, 0, strlen (filename) + sizeof (char));
+  strncpy ((char *) ms->filename, filename, strlen (filename));
+
+  ms->type = MEMIF_SOCKET_TYPE_NONE;
+
+  ms->interface_list_len = 1;
+  ms->interface_list =
+    lm->alloc (sizeof (memif_list_elt_t) * ms->interface_list_len);
+  if (ms->interface_list == NULL)
+    {
+      err = MEMIF_ERR_NOMEM;
+      goto error;
+    }
+  ms->interface_list[0].key = -1;
+  ms->interface_list[0].data_struct = NULL;
+
+  *sock = ms;
+
+  return err;
+
+error:
+  if (ms != NULL)
+    {
+      if (ms->filename != NULL)
+	{
+	  lm->free (ms->filename);
+	  ms->filename = NULL;
+	}
+      if (ms->fd > 0)
+	{
+	  close (ms->fd);
+	  ms->fd = -1;
+	}
+      if (ms->interface_list != NULL)
+	{
+	  lm->free (ms->interface_list);
+	  ms->interface_list = NULL;
+	  ms->interface_list_len = 0;
+	}
+      lm->free (ms);
+      *sock = ms = NULL;
+    }
+  return err;
+}
+
+int
 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
 	      memif_connection_update_t * on_connect,
 	      memif_connection_update_t * on_disconnect,
 	      memif_interrupt_t * on_interrupt, void *private_ctx)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (args->socket);
   int err, index = 0;
   memif_list_elt_t elt;
   memif_connection_t *conn = (memif_connection_t *) * c;
@@ -815,6 +1106,7 @@ memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
       DBG ("This handle already points to existing memif.");
       return MEMIF_ERR_CONN;
     }
+
   conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
   if (conn == NULL)
     {
@@ -865,19 +1157,14 @@ memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
 
   if (args->socket != NULL)
     conn->args.socket = args->socket;
+  else if (lm->default_socket != NULL)
+    conn->args.socket = lm->default_socket;
   else
     {
-      if (lm->default_socket == NULL)
-	{
-	  err =
-	    memif_create_socket ((memif_socket_handle_t *) &
-				 lm->default_socket,
-				 MEMIF_DEFAULT_SOCKET_PATH, NULL);
-	  if (err != MEMIF_ERR_SUCCESS)
-	    goto error;
-	}
-      conn->args.socket = lm->default_socket;
+      err = MEMIF_ERR_INVAL_ARG;
+      goto error;
     }
+
   ms = (memif_socket_t *) conn->args.socket;
 
   if ((conn->args.is_master && ms->type == MEMIF_SOCKET_TYPE_CLIENT) ||
@@ -889,22 +1176,25 @@ memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
 
   elt.key = conn->args.interface_id;
   elt.data_struct = conn;
-  add_list_elt (&elt, &ms->interface_list, &ms->interface_list_len);
+  add_list_elt (lm, &elt, &ms->interface_list, &ms->interface_list_len);
   ms->use_count++;
 
   if (conn->args.is_master)
     {
       if (ms->type == MEMIF_SOCKET_TYPE_NONE)
-	err = memif_socket_start_listening (ms);
-      if (err != MEMIF_ERR_SUCCESS)
-	goto error;
+	{
+	  err = memif_socket_start_listening (ms);
+	  if (err != MEMIF_ERR_SUCCESS)
+	    goto error;
+	}
     }
   else
     {
       elt.key = -1;
       elt.data_struct = conn;
       if ((index =
-	   add_list_elt (&elt, &lm->control_list, &lm->control_list_len)) < 0)
+	   add_list_elt (lm, &elt, &lm->control_list,
+			 &lm->control_list_len)) < 0)
 	{
 	  err = MEMIF_ERR_NOMEM;
 	  goto error;
@@ -923,7 +1213,7 @@ memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
 	      goto error;
 	    }
 	}
-	lm->disconn_slaves++;
+      lm->disconn_slaves++;
     }
 
   *c = conn;
@@ -940,8 +1230,8 @@ error:
 int
 memif_request_connection (memif_conn_handle_t c)
 {
-  libmemif_main_t *lm = &libmemif_main;
   memif_connection_t *conn = (memif_connection_t *) c;
+  libmemif_main_t *lm = get_libmemif_main (conn->args.socket);
   memif_socket_t *ms;
   int err = MEMIF_ERR_SUCCESS;
   int sockfd = -1;
@@ -995,8 +1285,7 @@ memif_request_connection (memif_conn_handle_t c)
   else
     {
       err = memif_syscall_error_handler (errno);
-      strcpy ((char *) conn->remote_disconnect_string,
-	      memif_strerror (err));
+      strcpy ((char *) conn->remote_disconnect_string, memif_strerror (err));
       goto error;
     }
 
@@ -1083,7 +1372,121 @@ memif_control_fd_handler (int fd, uint8_t events)
       get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
       if (e != NULL)
 	{
-	  err = memif_read_ready (fd);
+	  err = memif_read_ready (lm, fd);
+	  return err;
+	}
+
+      get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
+      if (e != NULL)
+	{
+	  if (events & MEMIF_FD_EVENT_READ)
+	    {
+	      err =
+		((memif_connection_t *) e->data_struct)->
+		read_fn (e->data_struct);
+	      if (err != MEMIF_ERR_SUCCESS)
+		return err;
+	    }
+	  if (events & MEMIF_FD_EVENT_WRITE)
+	    {
+	      err =
+		((memif_connection_t *) e->data_struct)->
+		write_fn (e->data_struct);
+	      if (err != MEMIF_ERR_SUCCESS)
+		return err;
+	    }
+	  if (events & MEMIF_FD_EVENT_ERROR)
+	    {
+	      err =
+		((memif_connection_t *) e->data_struct)->
+		error_fn (e->data_struct);
+	      if (err != MEMIF_ERR_SUCCESS)
+		return err;
+	    }
+	}
+    }
+
+  return MEMIF_ERR_SUCCESS;	/* 0 */
+
+error:
+  return err;
+}
+
+int
+memif_per_thread_control_fd_handler (memif_per_thread_main_handle_t pt_main,
+				     int fd, uint8_t events)
+{
+  int i, err = MEMIF_ERR_SUCCESS;	/* 0 */
+  uint16_t num;
+  memif_list_elt_t *e = NULL;
+  memif_connection_t *conn;
+  libmemif_main_t *lm = (libmemif_main_t *) pt_main;
+
+  if (fd == lm->timerfd)
+    {
+      uint64_t b;
+      ssize_t size;
+      size = read (fd, &b, sizeof (b));
+
+      if (size == -1)
+	goto error;
+
+      for (i = 0; i < lm->control_list_len; i++)
+	{
+	  if ((lm->control_list[i].key < 0)
+	      && (lm->control_list[i].data_struct != NULL))
+	    {
+	      conn = lm->control_list[i].data_struct;
+	      if (conn->args.is_master)
+		continue;
+	      err = memif_request_connection (conn);
+	      if (err != MEMIF_ERR_SUCCESS)
+		DBG ("memif_request_connection: %s", memif_strerror (err));
+	    }
+	}
+    }
+  else
+    {
+      get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
+      if (e != NULL)
+	{
+	  if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
+	    {
+	      num =
+		(((memif_connection_t *) e->data_struct)->
+		 args.is_master) ? ((memif_connection_t *) e->
+				    data_struct)->run_args.
+		num_s2m_rings : ((memif_connection_t *) e->data_struct)->
+		run_args.num_m2s_rings;
+	      for (i = 0; i < num; i++)
+		{
+		  if (((memif_connection_t *) e->data_struct)->
+		      rx_queues[i].int_fd == fd)
+		    {
+		      ((memif_connection_t *) e->data_struct)->
+			on_interrupt ((void *) e->data_struct,
+				      ((memif_connection_t *) e->
+				       data_struct)->private_ctx, i);
+		      return MEMIF_ERR_SUCCESS;
+		    }
+		}
+	    }
+	  return MEMIF_ERR_SUCCESS;
+	}
+      get_list_elt (&e, lm->socket_list, lm->socket_list_len, fd);
+      if (e != NULL
+	  && ((memif_socket_t *) e->data_struct)->type ==
+	  MEMIF_SOCKET_TYPE_LISTENER)
+	{
+	  err =
+	    memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
+	  return err;
+	}
+
+      get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
+      if (e != NULL)
+	{
+	  err = memif_read_ready (lm, fd);
 	  return err;
 	}
 
@@ -1126,6 +1529,7 @@ error:
 int
 memif_poll_event (int timeout)
 {
+  libmemif_main_t *lm = &libmemif_main;
   struct epoll_event evt;
   int en = 0, err = MEMIF_ERR_SUCCESS;	/* 0 */
   uint32_t events = 0;
@@ -1135,7 +1539,7 @@ memif_poll_event (int timeout)
   evt.events = EPOLLIN | EPOLLOUT;
   sigset_t sigset;
   sigemptyset (&sigset);
-  en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
+  en = epoll_pwait (lm->epfd, &evt, 1, timeout, &sigset);
   if (en < 0)
     {
       err = errno;
@@ -1144,7 +1548,50 @@ memif_poll_event (int timeout)
     }
   if (en > 0)
     {
-      if (evt.data.fd == poll_cancel_fd)
+      if (evt.data.fd == lm->poll_cancel_fd)
+	{
+	  r = read (evt.data.fd, &counter, sizeof (counter));
+	  if (r == -1)
+	    return MEMIF_ERR_DISCONNECTED;
+
+	  return MEMIF_ERR_POLL_CANCEL;
+	}
+      if (evt.events & EPOLLIN)
+	events |= MEMIF_FD_EVENT_READ;
+      if (evt.events & EPOLLOUT)
+	events |= MEMIF_FD_EVENT_WRITE;
+      if (evt.events & EPOLLERR)
+	events |= MEMIF_FD_EVENT_ERROR;
+      err = memif_control_fd_handler (evt.data.fd, events);
+      return err;
+    }
+  return 0;
+}
+
+int
+memif_per_thread_poll_event (memif_per_thread_main_handle_t pt_main,
+			     int timeout)
+{
+  libmemif_main_t *lm = (libmemif_main_t *) pt_main;
+  struct epoll_event evt;
+  int en = 0, err = MEMIF_ERR_SUCCESS;	/* 0 */
+  uint32_t events = 0;
+  uint64_t counter = 0;
+  ssize_t r = 0;
+  memset (&evt, 0, sizeof (evt));
+  evt.events = EPOLLIN | EPOLLOUT;
+  sigset_t sigset;
+  sigemptyset (&sigset);
+  en = epoll_pwait (lm->epfd, &evt, 1, timeout, &sigset);
+  if (en < 0)
+    {
+      err = errno;
+      DBG ("epoll_pwait: %s", strerror (err));
+      return memif_syscall_error_handler (err);
+    }
+  if (en > 0)
+    {
+      if (evt.data.fd == lm->poll_cancel_fd)
 	{
 	  r = read (evt.data.fd, &counter, sizeof (counter));
 	  if (r == -1)
@@ -1167,12 +1614,32 @@ memif_poll_event (int timeout)
 int
 memif_cancel_poll_event ()
 {
+  libmemif_main_t *lm = &libmemif_main;
   uint64_t counter = 1;
   ssize_t w = 0;
 
-  if (poll_cancel_fd == -1)
+  if (lm->poll_cancel_fd == -1)
     return 0;
-  w = write (poll_cancel_fd, &counter, sizeof (counter));
+  w = write (lm->poll_cancel_fd, &counter, sizeof (counter));
+  if (w < sizeof (counter))
+    return MEMIF_ERR_INT_WRITE;
+
+  return 0;
+}
+
+int
+memif_per_thread_cancel_poll_event (memif_per_thread_main_handle_t pt_main)
+{
+  libmemif_main_t *lm = (libmemif_main_t *) pt_main;
+  uint64_t counter = 1;
+  ssize_t w = 0;
+
+  if (lm == NULL)
+    return MEMIF_ERR_INVAL_ARG;
+
+  if (lm->poll_cancel_fd == -1)
+    return 0;
+  w = write (lm->poll_cancel_fd, &counter, sizeof (counter));
   if (w < sizeof (counter))
     return MEMIF_ERR_INT_WRITE;
 
@@ -1194,16 +1661,17 @@ memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
 int
 memif_disconnect_internal (memif_connection_t * c)
 {
+  uint16_t num;
+  int err = MEMIF_ERR_SUCCESS, i;	/* 0 */
+  memif_queue_t *mq;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
+  memif_list_elt_t *e;
+
   if (c == NULL)
     {
       DBG ("no connection");
       return MEMIF_ERR_NOCONN;
     }
-  uint16_t num;
-  int err = MEMIF_ERR_SUCCESS, i;	/* 0 */
-  memif_queue_t *mq;
-  libmemif_main_t *lm = &libmemif_main;
-  memif_list_elt_t *e;
 
   c->on_disconnect ((void *) c, c->private_ctx);
 
@@ -1311,11 +1779,22 @@ memif_disconnect_internal (memif_connection_t * c)
   return err;
 }
 
+const char *
+memif_get_socket_filename (memif_socket_handle_t sock)
+{
+  memif_socket_t *ms = (memif_socket_t *) sock;
+
+  if (ms == NULL)
+    return NULL;
+
+  return (char *) ms->filename;
+}
+
 int
 memif_delete_socket (memif_socket_handle_t * sock)
 {
   memif_socket_t *ms = (memif_socket_t *) * sock;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (ms);
 
   /* check if socket is in use */
   if (ms == NULL || ms->type != MEMIF_SOCKET_TYPE_NONE)
@@ -1335,7 +1814,7 @@ int
 memif_delete (memif_conn_handle_t * conn)
 {
   memif_connection_t *c = (memif_connection_t *) * conn;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_socket_t *ms = NULL;
   int err = MEMIF_ERR_SUCCESS;
 
@@ -1396,7 +1875,7 @@ memif_delete (memif_conn_handle_t * conn)
 int
 memif_connect1 (memif_connection_t * c)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_region_t *mr;
   memif_queue_t *mq;
   int i;
@@ -1578,7 +2057,7 @@ memif_init_queues (libmemif_main_t * lm, memif_connection_t * conn)
 	return memif_syscall_error_handler (errno);
       e.key = mq[x].int_fd;
       e.data_struct = conn;
-      add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
+      add_list_elt (lm, &e, &lm->interrupt_list, &lm->interrupt_list_len);
 
       mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
       DBG ("RING: %p I: %d", mq[x].ring, x);
@@ -1603,7 +2082,7 @@ memif_init_queues (libmemif_main_t * lm, memif_connection_t * conn)
 	return memif_syscall_error_handler (errno);
       e.key = mq[x].int_fd;
       e.data_struct = conn;
-      add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
+      add_list_elt (lm, &e, &lm->interrupt_list, &lm->interrupt_list_len);
 
       mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
       DBG ("RING: %p I: %d", mq[x].ring, x);
@@ -1623,7 +2102,7 @@ int
 memif_init_regions_and_queues (memif_connection_t * conn)
 {
   memif_region_t *r;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (conn->args.socket);
 
   /* region 0. rings */
   memif_add_region (lm, conn, /* has_buffers */ 0);
@@ -1756,7 +2235,7 @@ memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
   if (EXPECT_FALSE (!count_out))
     return MEMIF_ERR_INVAL_ARG;
 
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_queue_t *mq = &c->tx_queues[qid];
   memif_ring_t *ring = mq->ring;
   memif_buffer_t *b0;
@@ -1878,7 +2357,7 @@ memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
     run_args.num_m2s_rings;
   if (EXPECT_FALSE (qid >= num))
     return MEMIF_ERR_QID;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_queue_t *mq = &c->rx_queues[qid];
   memif_ring_t *ring = mq->ring;
   uint16_t mask = (1 << mq->log2_ring_size) - 1;
@@ -2074,8 +2553,8 @@ int
 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
 		   char *buf, ssize_t buflen)
 {
-  libmemif_main_t *lm = &libmemif_main;
   memif_connection_t *c = (memif_connection_t *) conn;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_socket_t *ms;
   int err = MEMIF_ERR_SUCCESS, i;
   ssize_t l0 = 0, l1;
@@ -2258,7 +2737,7 @@ memif_cleanup ()
 {
   libmemif_main_t *lm = &libmemif_main;
 
-  memif_delete_socket ((memif_socket_handle_t *) &lm->default_socket);
+  memif_delete_socket ((memif_socket_handle_t *) & lm->default_socket);
 
   if (lm->control_list)
     lm->free (lm->control_list);
@@ -2272,8 +2751,40 @@ memif_cleanup ()
   if (lm->pending_list)
     lm->free (lm->pending_list);
   lm->pending_list = NULL;
-  if (poll_cancel_fd != -1)
-    close (poll_cancel_fd);
+  if (lm->poll_cancel_fd != -1)
+    close (lm->poll_cancel_fd);
+
+  return MEMIF_ERR_SUCCESS;	/* 0 */
+}
+
+int
+memif_per_thread_cleanup (memif_per_thread_main_handle_t * pt_main)
+{
+  libmemif_main_t *lm = (libmemif_main_t *) * pt_main;
+
+  if (lm == NULL)
+    return MEMIF_ERR_INVAL_ARG;
+
+  /* No default socket in case of per thread */
+
+  if (lm->control_list)
+    lm->free (lm->control_list);
+  lm->control_list = NULL;
+  if (lm->interrupt_list)
+    lm->free (lm->interrupt_list);
+  lm->interrupt_list = NULL;
+  if (lm->socket_list)
+    lm->free (lm->socket_list);
+  lm->socket_list = NULL;
+  if (lm->pending_list)
+    lm->free (lm->pending_list);
+  lm->pending_list = NULL;
+  if (lm->poll_cancel_fd != -1)
+    close (lm->poll_cancel_fd);
+
+  lm->free (lm);
+
+  *pt_main = NULL;
 
   return MEMIF_ERR_SUCCESS;	/* 0 */
 }
diff --git a/extras/libmemif/src/memif_private.h b/extras/libmemif/src/memif_private.h
index eceac677752..88237dca265 100644
--- a/extras/libmemif/src/memif_private.h
+++ b/extras/libmemif/src/memif_private.h
@@ -120,6 +120,8 @@ typedef struct
   memif_log2_ring_size_t log2_ring_size;
 } memif_conn_run_args_t;
 
+struct libmemif_main;
+
 typedef struct memif_connection
 {
   uint16_t index;
@@ -165,19 +167,25 @@ typedef struct
   uint16_t use_count;
   memif_socket_type_t type;
   uint8_t *filename;
+  /* unique database */
+  struct libmemif_main *lm;
   uint16_t interface_list_len;
   void *private_ctx;
   memif_list_elt_t *interface_list;	/* memif master interfaces listening on this socket */
 } memif_socket_t;
 
-typedef struct
+typedef struct libmemif_main
 {
   memif_control_fd_update_t *control_fd_update;
   int timerfd;
+  int epfd;
+  int poll_cancel_fd;
   struct itimerspec arm, disarm;
   uint16_t disconn_slaves;
   uint8_t app_name[MEMIF_NAME_LEN];
 
+  void *private_ctx;
+
   memif_socket_handle_t default_socket;
 
   memif_add_external_region_t *add_external_region;
@@ -200,7 +208,6 @@ typedef struct
 } libmemif_main_t;
 
 extern libmemif_main_t libmemif_main;
-extern int memif_epfd;
 
 /* main.c */
 
@@ -215,7 +222,7 @@ int memif_disconnect_internal (memif_connection_t * c);
 /* map errno to memif error code */
 int memif_syscall_error_handler (int err_code);
 
-int add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list,
+int add_list_elt (libmemif_main_t *lm, memif_list_elt_t * e, memif_list_elt_t ** list,
 		  uint16_t * len);
 
 int get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list,
@@ -223,6 +230,8 @@ int get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list,
 
 int free_list_elt (memif_list_elt_t * list, uint16_t len, int key);
 
+libmemif_main_t *get_libmemif_main (memif_socket_t * ms);
+
 #ifndef __NR_memfd_create
 #if defined __x86_64__
 #define __NR_memfd_create 319
diff --git a/extras/libmemif/src/socket.c b/extras/libmemif/src/socket.c
index 6efcfb5b5f7..2ea6fabc58b 100644
--- a/extras/libmemif/src/socket.c
+++ b/extras/libmemif/src/socket.c
@@ -71,7 +71,7 @@ memif_msg_send (int fd, memif_msg_t * msg, int afd)
 static_fn int
 memif_msg_enq_ack (memif_connection_t * c)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_msg_queue_elt_t *e =
     (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t));
   if (e == NULL)
@@ -99,9 +99,8 @@ memif_msg_enq_ack (memif_connection_t * c)
 }
 
 static_fn int
-memif_msg_send_hello (int fd)
+memif_msg_send_hello (libmemif_main_t * lm, int fd)
 {
-  libmemif_main_t *lm = &libmemif_main;
   memif_msg_t msg = { 0 };
   memif_msg_hello_t *h = &msg.hello;
   msg.type = MEMIF_MSG_TYPE_HELLO;
@@ -124,7 +123,7 @@ memif_msg_send_hello (int fd)
 static_fn int
 memif_msg_enq_init (memif_connection_t * c)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_msg_queue_elt_t *e =
     (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t));
   if (e == NULL)
@@ -166,7 +165,7 @@ memif_msg_enq_init (memif_connection_t * c)
 static_fn int
 memif_msg_enq_add_region (memif_connection_t * c, uint8_t region_index)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_region_t *mr = &c->regions[region_index];
 
   memif_msg_queue_elt_t *e =
@@ -203,7 +202,7 @@ memif_msg_enq_add_region (memif_connection_t * c, uint8_t region_index)
 static_fn int
 memif_msg_enq_add_ring (memif_connection_t * c, uint8_t index, uint8_t dir)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_msg_queue_elt_t *e =
     (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t));
   if (e == NULL)
@@ -250,7 +249,7 @@ memif_msg_enq_add_ring (memif_connection_t * c, uint8_t index, uint8_t dir)
 static_fn int
 memif_msg_enq_connect (memif_connection_t * c)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_msg_queue_elt_t *e =
     (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t));
   if (e == NULL)
@@ -285,7 +284,7 @@ memif_msg_enq_connect (memif_connection_t * c)
 static_fn int
 memif_msg_enq_connected (memif_connection_t * c)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_msg_queue_elt_t *e =
     (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t));
   if (e == NULL)
@@ -371,10 +370,11 @@ memif_msg_receive_init (memif_socket_t * ms, int fd, memif_msg_t * msg)
   memif_list_elt_t *elt = NULL;
   memif_list_elt_t elt2;
   memif_connection_t *c = NULL;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (ms);
   uint8_t err_string[96];
   memset (err_string, 0, sizeof (char) * 96);
   int err = MEMIF_ERR_SUCCESS;	/* 0 */
+
   if (i->version != MEMIF_VERSION)
     {
       DBG ("MEMIF_VER_ERR");
@@ -464,7 +464,7 @@ memif_msg_receive_init (memif_socket_t * ms, int fd, memif_msg_t * msg)
   elt2.key = c->fd;
   elt2.data_struct = c;
 
-  add_list_elt (&elt2, &lm->control_list, &lm->control_list_len);
+  add_list_elt (lm, &elt2, &lm->control_list, &lm->control_list_len);
   free_list_elt (lm->pending_list, lm->pending_list_len, fd);
 
   return err;
@@ -483,7 +483,7 @@ static_fn int
 memif_msg_receive_add_region (memif_connection_t * c, memif_msg_t * msg,
 			      int fd)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
 
   memif_msg_add_region_t *ar = &msg->add_region;
   memif_region_t *mr;
@@ -517,7 +517,7 @@ memif_msg_receive_add_region (memif_connection_t * c, memif_msg_t * msg,
 static_fn int
 memif_msg_receive_add_ring (memif_connection_t * c, memif_msg_t * msg, int fd)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
 
   memif_msg_add_ring_t *ar = &msg->add_ring;
 
@@ -580,7 +580,7 @@ static_fn int
 memif_msg_receive_connect (memif_connection_t * c, memif_msg_t * msg)
 {
   memif_msg_connect_t *cm = &msg->connect;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   memif_list_elt_t elt;
 
   int err;
@@ -598,7 +598,8 @@ memif_msg_receive_connect (memif_connection_t * c, memif_msg_t * msg)
 	{
 	  elt.key = c->rx_queues[i].int_fd;
 	  elt.data_struct = c;
-	  add_list_elt (&elt, &lm->interrupt_list, &lm->interrupt_list_len);
+	  add_list_elt (lm, &elt, &lm->interrupt_list,
+			&lm->interrupt_list_len);
 
 	  lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ,
 				 c->private_ctx);
@@ -616,7 +617,7 @@ static_fn int
 memif_msg_receive_connected (memif_connection_t * c, memif_msg_t * msg)
 {
   memif_msg_connect_t *cm = &msg->connect;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
 
   int err;
   err = memif_connect1 (c);
@@ -658,7 +659,7 @@ memif_msg_receive_disconnect (memif_connection_t * c, memif_msg_t * msg)
 }
 
 static_fn int
-memif_msg_receive (int ifd)
+memif_msg_receive (libmemif_main_t * lm, int ifd)
 {
   char ctl[CMSG_SPACE (sizeof (int)) +
 	   CMSG_SPACE (sizeof (struct ucred))] = { 0 };
@@ -669,7 +670,6 @@ memif_msg_receive (int ifd)
   int err = MEMIF_ERR_SUCCESS;	/* 0 */
   int fd = -1;
   int i;
-  libmemif_main_t *lm = &libmemif_main;
   memif_connection_t *c = NULL;
   memif_socket_t *ms = NULL;
   memif_list_elt_t *elt = NULL;
@@ -827,8 +827,10 @@ memif_conn_fd_error (memif_connection_t * c)
 int
 memif_conn_fd_read_ready (memif_connection_t * c)
 {
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   int err;
-  err = memif_msg_receive (c->fd);
+
+  err = memif_msg_receive (lm, c->fd);
   if (err != 0)
     {
       err = memif_disconnect_internal (c);
@@ -840,7 +842,7 @@ memif_conn_fd_read_ready (memif_connection_t * c)
 int
 memif_conn_fd_write_ready (memif_connection_t * c)
 {
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (c->args.socket);
   int err = MEMIF_ERR_SUCCESS;	/* 0 */
 
 
@@ -869,7 +871,7 @@ memif_conn_fd_accept_ready (memif_socket_t * ms)
   int addr_len;
   struct sockaddr_un client;
   int conn_fd;
-  libmemif_main_t *lm = &libmemif_main;
+  libmemif_main_t *lm = get_libmemif_main (ms);
 
   DBG ("accept called");
 
@@ -888,19 +890,19 @@ memif_conn_fd_accept_ready (memif_socket_t * ms)
   elt.key = conn_fd;
   elt.data_struct = ms;
 
-  add_list_elt (&elt, &lm->pending_list, &lm->pending_list_len);
+  add_list_elt (lm, &elt, &lm->pending_list, &lm->pending_list_len);
   lm->control_fd_update (conn_fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE,
 			 ms->private_ctx);
 
-  return memif_msg_send_hello (conn_fd);
+  return memif_msg_send_hello (lm, conn_fd);
 }
 
 int
-memif_read_ready (int fd)
+memif_read_ready (libmemif_main_t * lm, int fd)
 {
   int err;
 
-  err = memif_msg_receive (fd);
+  err = memif_msg_receive (lm, fd);
 
   return err;
 }
diff --git a/extras/libmemif/src/socket.h b/extras/libmemif/src/socket.h
index e0792270b53..ea6979d6bd5 100644
--- a/extras/libmemif/src/socket.h
+++ b/extras/libmemif/src/socket.h
@@ -39,7 +39,7 @@ int memif_conn_fd_error (memif_connection_t * c);
 
 int memif_conn_fd_accept_ready (memif_socket_t * ms);
 
-int memif_read_ready (int fd);
+int memif_read_ready (libmemif_main_t *lm, int fd);
 
 int memif_msg_send_disconnect (int fd, uint8_t * err_string,
 			       uint32_t err_code);
@@ -53,7 +53,7 @@ int memif_msg_send (int fd, memif_msg_t * msg, int afd);
 
 int memif_msg_enq_ack (memif_connection_t * c);
 
-int memif_msg_send_hello (int fd);
+int memif_msg_send_hello (libmemif_main_t *lm, int fd);
 
 int memif_msg_enq_init (memif_connection_t * c);
 
diff --git a/extras/libmemif/test/main_test.c b/extras/libmemif/test/main_test.c
index 0a8e091f395..8ad9961157f 100644
--- a/extras/libmemif/test/main_test.c
+++ b/extras/libmemif/test/main_test.c
@@ -94,7 +94,7 @@ START_TEST (test_init_epoll)
   ck_assert_ptr_ne (lm, NULL);
   ck_assert_ptr_ne (lm->control_fd_update, NULL);
   ck_assert_int_gt (lm->timerfd, 2);
-  ck_assert_int_gt (memif_epfd, -1);
+  ck_assert_int_gt (lm->epfd, -1);
 
   if (lm->timerfd > 0)
     close (lm->timerfd);
diff --git a/extras/libmemif/test/socket_test.c b/extras/libmemif/test/socket_test.c
index 589bfd84cb7..2d229383c20 100644
--- a/extras/libmemif/test/socket_test.c
+++ b/extras/libmemif/test/socket_test.c
@@ -296,7 +296,9 @@ START_TEST (test_send_hello)
 		   NULL, NULL)) != MEMIF_ERR_SUCCESS)
     ck_abort_msg ("err code: %u, err msg: %s", err, memif_strerror (err));
 
-  if ((err = memif_msg_send_hello (conn.fd)) != MEMIF_ERR_SUCCESS)
+  conn.args.socket = libmemif_main.default_socket;
+
+  if ((err = memif_msg_send_hello (get_libmemif_main (conn.args.socket), conn.fd)) != MEMIF_ERR_SUCCESS)
     ck_assert_msg (err == MEMIF_ERR_BAD_FD,
 		   "err code: %u, err msg: %s", err, memif_strerror (err));
 }
@@ -387,7 +389,7 @@ START_TEST (test_recv_init)
   memif_list_elt_t elt;
   elt.key = 69;
   elt.data_struct = &conn;
-  add_list_elt (&elt, &ms.interface_list, &ms.interface_list_len);
+  add_list_elt (get_libmemif_main (conn.args.socket), &elt, &ms.interface_list, &ms.interface_list_len);
 
   if ((err =
        memif_init (control_fd_update, TEST_APP_NAME, NULL,