/* *------------------------------------------------------------------ * persist.c - persistent data structure storage test / demo code * * Copyright (c) 2013 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 <stdio.h> #include <stdlib.h> #include <sys/types.h> #include <sys/mman.h> #include <sys/stat.h> #include <netinet/in.h> #include <signal.h> #include <pthread.h> #include <unistd.h> #include <time.h> #include <fcntl.h> #include <string.h> #include <vppinfra/clib.h> #include <vppinfra/vec.h> #include <vppinfra/hash.h> #include <vppinfra/bitmap.h> #include <vppinfra/fifo.h> #include <vppinfra/time.h> #include <vppinfra/mheap.h> #include <vppinfra/heap.h> #include <vppinfra/pool.h> #include <vppinfra/format.h> #include <vppinfra/serialize.h> #include <svmdb.h> typedef struct { svmdb_client_t *c; } persist_main_t; persist_main_t persist_main; typedef struct { u8 *string1; u8 *string2; } demo_struct2_t; typedef struct { demo_struct2_t *demo2; u8 *name; } demo_struct1_t; /* * Data structures in persistent shared memory, all the time */ clib_error_t * persist_malloc (persist_main_t * pm) { demo_struct2_t *demo2; demo_struct1_t *demo1; time_t starttime = time (0); char *datestring = ctime (&starttime); void *oldheap; /* Get back the root pointer */ demo1 = svmdb_local_get_variable_reference (pm->c, SVMDB_NAMESPACE_VEC, "demo1_location"); /* It doesnt exist create our data structures */ if (demo1 == 0) { /* If you want MP / thread safety, lock the region... */ pthread_mutex_lock (&pm->c->db_rp->mutex); /* Switch to the shared memory region heap */ oldheap = svm_push_data_heap (pm->c->db_rp); /* Allocate the top-level structure as a single element vector */ vec_validate (demo1, 0); /* Allocate the next-level structure as a plain old memory obj */ demo2 = clib_mem_alloc (sizeof (*demo2)); demo1->demo2 = demo2; demo1->name = format (0, "My name is Ishmael%c", 0); demo2->string1 = format (0, "Here is string1%c", 0); demo2->string2 = format (0, "Born at %s%c", datestring, 0); /* Back to the process-private heap */ svm_pop_heap (oldheap); pthread_mutex_unlock (&pm->c->db_rp->mutex); /* * Set the root pointer. Note: this guy switches heaps, locks, etc. * We allocated demo1 as a vector to make this "just work..." */ svmdb_local_set_vec_variable (pm->c, "demo1_location", demo1, sizeof (demo1)); } else { /* retrieve and print data from shared memory */ demo2 = demo1->demo2; fformat (stdout, "name: %s\n", demo1->name); fformat (stdout, "demo2 location: %llx\n", demo2); fformat (stdout, "string1: %s\n", demo2->string1); fformat (stdout, "string2: %s\n", demo2->string2); } return 0; } void unserialize_demo1 (serialize_main_t * sm, va_list * args) { demo_struct1_t **result = va_arg (*args, demo_struct1_t **); demo_struct1_t *demo1; demo_struct2_t *demo2; /* Allocate data structures in process private memory */ demo1 = clib_mem_alloc (sizeof (*demo1)); demo2 = clib_mem_alloc (sizeof (*demo2)); demo1->demo2 = demo2; /* retrieve data from shared memory checkpoint */ unserialize_cstring (sm, (char **) &demo1->name); unserialize_cstring (sm, (char **) &demo2->string1); unserialize_cstring (sm, (char **) &demo2->string2); *result = demo1; } void serialize_demo1 (serialize_main_t * sm, va_list * args) { demo_struct1_t *demo1 = va_arg (*args, demo_struct1_t *); demo_struct2_t *demo2 = demo1->demo2; serialize_cstring (sm, (char *) demo1->name); serialize_cstring (sm, (char *) demo2->string1); serialize_cstring (sm, (char *) demo2->string2); } /* Serialize / unserialize variant */ clib_error_t * persist_serialize (persist_main_t * pm) { u8 *checkpoint; serialize_main_t sm; demo_struct2_t *demo2; demo_struct1_t *demo1; time_t starttime = time (0); char *datestring = ctime (&starttime); /* Get back the root pointer */ checkpoint = svmdb_local_get_vec_variable (pm->c, "demo1_checkpoint", sizeof (u8)); /* It doesnt exist create our data structures */ if (checkpoint == 0) { /* Allocate data structures in process-private memory */ demo1 = clib_mem_alloc (sizeof (*demo2)); vec_validate (demo1, 0); demo2 = clib_mem_alloc (sizeof (*demo2)); demo1->demo2 = demo2; demo1->name = format (0, "My name is Ishmael%c", 0); demo2->string1 = format (0, "Here is string1%c", 0); demo2->string2 = format (0, "Born at %s%c", datestring, 0); /* Create checkpoint */ serialize_open_vector (&sm, checkpoint); serialize (&sm, serialize_demo1, demo1); checkpoint = serialize_close_vector (&sm); /* Copy checkpoint into shared memory */ svmdb_local_set_vec_variable (pm->c, "demo1_checkpoint", checkpoint, sizeof (u8)); /* Toss the process-private-memory original.. */ vec_free (checkpoint); } else { /* Open the checkpoint */ unserialize_open_data (&sm, checkpoint, vec_len (checkpoint)); unserialize (&sm, unserialize_demo1, &demo1); /* Toss the process-private-memory checkpoint copy */ vec_free (checkpoint); /* Off we go... */ demo2 = demo1->demo2; fformat (stdout, "name: %s\n", demo1->name); fformat (stdout, "demo2 location: %llx\n", demo2); fformat (stdout, "string1: %s\n", demo2->string1); fformat (stdout, "string2: %s\n", demo2->string2); } return 0; } int main (int argc, char **argv) { unformat_input_t _input, *input = &_input; persist_main_t *pm = &persist_main; clib_error_t *error = 0; /* Make a 4mb database arena, chroot so it's truly private */ pm->c = svmdb_map_chroot_size ("/ptest", 4 << 20); ASSERT (pm->c); unformat_init_command_line (input, argv); while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "malloc")) error = persist_malloc (pm); else if (unformat (input, "serialize")) error = persist_serialize (pm); else { error = clib_error_return (0, "Unknown flavor '%U'", format_unformat_error, input); break; } } svmdb_unmap (pm->c); if (error) { clib_error_report (error); exit (1); } return 0; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */