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-rw-r--r--src/vppinfra.am13
-rw-r--r--src/vppinfra/test_tw_timer.c592
-rw-r--r--src/vppinfra/tw_timer_16t_2w_512sl.c26
-rw-r--r--src/vppinfra/tw_timer_16t_2w_512sl.h46
-rw-r--r--src/vppinfra/tw_timer_2t_1w_2048sl.c26
-rw-r--r--src/vppinfra/tw_timer_2t_1w_2048sl.h46
-rw-r--r--src/vppinfra/tw_timer_template.c341
-rw-r--r--src/vppinfra/tw_timer_template.h199
8 files changed, 1289 insertions, 0 deletions
diff --git a/src/vppinfra.am b/src/vppinfra.am
index 724f21c9705..eb8a92b89b8 100644
--- a/src/vppinfra.am
+++ b/src/vppinfra.am
@@ -37,6 +37,7 @@ TESTS += test_bihash_template \
test_socket \
test_time \
test_timing_wheel \
+ test_tw_timer \
test_vec \
test_zvec
endif
@@ -65,6 +66,7 @@ test_slist_SOURCES = vppinfra/test_slist.c
test_socket_SOURCES = vppinfra/test_socket.c
test_time_SOURCES = vppinfra/test_time.c
test_timing_wheel_SOURCES = vppinfra/test_timing_wheel.c
+test_tw_timer_SOURCES = vppinfra/test_tw_timer.c
test_vec_SOURCES = vppinfra/test_vec.c
test_zvec_SOURCES = vppinfra/test_zvec.c
@@ -91,6 +93,7 @@ test_serialize_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
test_slist_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
test_time_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
test_timing_wheel_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
+test_tw_timer_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
test_vec_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
test_zvec_CPPFLAGS = $(AM_CPPFLAGS) -DCLIB_DEBUG
@@ -115,6 +118,7 @@ test_slist_LDADD = libvppinfra.la
test_socket_LDADD = libvppinfra.la
test_time_LDADD = libvppinfra.la -lm
test_timing_wheel_LDADD = libvppinfra.la -lm
+test_tw_timer_LDADD = libvppinfra.la
test_vec_LDADD = libvppinfra.la
test_zvec_LDADD = libvppinfra.la
@@ -139,6 +143,7 @@ test_slist_LDFLAGS = -static
test_socket_LDFLAGS = -static
test_time_LDFLAGS = -static
test_timing_wheel_LDFLAGS = -static
+test_tw_timer_LDFLAGS = -static
test_vec_LDFLAGS = -static
test_zvec_LDFLAGS = -static
@@ -199,6 +204,9 @@ nobase_include_HEADERS = \
vppinfra/time.h \
vppinfra/timing_wheel.h \
vppinfra/timer.h \
+ vppinfra/tw_timer_2t_1w_2048sl.h \
+ vppinfra/tw_timer_16t_2w_512sl.h \
+ vppinfra/tw_timer_template.h \
vppinfra/types.h \
vppinfra/unix.h \
vppinfra/vec.h \
@@ -247,6 +255,11 @@ CLIB_CORE = \
vppinfra/string.c \
vppinfra/time.c \
vppinfra/timing_wheel.c \
+ vppinfra/tw_timer_template.h \
+ vppinfra/tw_timer_2t_1w_2048sl.h \
+ vppinfra/tw_timer_2t_1w_2048sl.c \
+ vppinfra/tw_timer_16t_2w_512sl.h \
+ vppinfra/tw_timer_16t_2w_512sl.c \
vppinfra/unformat.c \
vppinfra/vec.c \
vppinfra/vector.c \
diff --git a/src/vppinfra/test_tw_timer.c b/src/vppinfra/test_tw_timer.c
new file mode 100644
index 00000000000..a0287b89862
--- /dev/null
+++ b/src/vppinfra/test_tw_timer.c
@@ -0,0 +1,592 @@
+#include <vppinfra/time.h>
+#include <vppinfra/cache.h>
+#include <vppinfra/error.h>
+#include <vppinfra/tw_timer_2t_1w_2048sl.h>
+#include <vppinfra/tw_timer_16t_2w_512sl.h>
+
+typedef struct
+{
+ /** Handle returned from tw_start_timer */
+ u32 stop_timer_handle;
+
+ /** Test item should expire at this clock tick */
+ u32 expected_to_expire;
+} tw_timer_test_elt_t;
+
+typedef struct
+{
+ /** Pool of test objects */
+ tw_timer_test_elt_t *test_elts;
+
+ /** The single-wheel */
+ tw_timer_wheel_2t_1w_2048sl_t single_wheel;
+
+ /** The double-wheel */
+ tw_timer_wheel_16t_2w_512sl_t double_wheel;
+
+ /** random number seed */
+ u32 seed;
+
+ /** number of timers */
+ u32 ntimers;
+
+ /** number of "churn" iterations */
+ u32 niter;
+
+ /** number of clock ticks per churn iteration */
+ u32 ticks_per_iter;
+
+ /** cpu timer */
+ clib_time_t clib_time;
+} tw_timer_test_main_t;
+
+tw_timer_test_main_t tw_timer_test_main;
+
+static void
+run_single_wheel (tw_timer_wheel_2t_1w_2048sl_t * tw, u32 n_ticks)
+{
+ u32 i;
+ f64 now = tw->last_run_time + 1.01;
+
+ for (i = 0; i < n_ticks; i++)
+ {
+ tw_timer_expire_timers_2t_1w_2048sl (tw, now);
+ now += 1.01;
+ }
+}
+
+static void
+run_double_wheel (tw_timer_wheel_16t_2w_512sl_t * tw, u32 n_ticks)
+{
+ u32 i;
+ f64 now = tw->last_run_time + 1.01;
+
+ for (i = 0; i < n_ticks; i++)
+ {
+ tw_timer_expire_timers_16t_2w_512sl (tw, now);
+ now += 1.01;
+ }
+}
+
+static void
+expired_timer_single_callback (u32 * expired_timers)
+{
+ int i;
+ u32 pool_index, timer_id;
+ tw_timer_test_elt_t *e;
+ tw_timer_test_main_t *tm = &tw_timer_test_main;
+
+ for (i = 0; i < vec_len (expired_timers); i++)
+ {
+ pool_index = expired_timers[i] & 0x7FFFFFFF;
+ timer_id = expired_timers[i] >> 31;
+
+ ASSERT (timer_id == 1);
+
+ e = pool_elt_at_index (tm->test_elts, pool_index);
+
+ if (e->expected_to_expire != tm->single_wheel.current_tick)
+ {
+ fformat (stdout, "[%d] expired at %d not %d\n",
+ e - tm->test_elts, tm->single_wheel.current_tick,
+ e->expected_to_expire);
+ }
+ pool_put (tm->test_elts, e);
+ }
+}
+
+static void
+expired_timer_double_callback (u32 * expired_timers)
+{
+ int i;
+ u32 pool_index, timer_id;
+ tw_timer_test_elt_t *e;
+ tw_timer_test_main_t *tm = &tw_timer_test_main;
+
+ for (i = 0; i < vec_len (expired_timers); i++)
+ {
+ pool_index = expired_timers[i] & 0x0FFFFFFF;
+ timer_id = expired_timers[i] >> 28;
+
+ ASSERT (timer_id == 14);
+
+ e = pool_elt_at_index (tm->test_elts, pool_index);
+
+ if (e->expected_to_expire != tm->double_wheel.current_tick)
+ {
+ fformat (stdout, "[%d] expired at %d not %d\n",
+ e - tm->test_elts, tm->double_wheel.current_tick,
+ e->expected_to_expire);
+ }
+ pool_put (tm->test_elts, e);
+ }
+}
+
+static clib_error_t *
+test2_single (tw_timer_test_main_t * tm)
+{
+ u32 i, j;
+ tw_timer_test_elt_t *e;
+ u32 initial_wheel_offset;
+ u32 expiration_time;
+ u32 max_expiration_time = 0;
+ u32 *deleted_indices = 0;
+ u32 adds = 0, deletes = 0;
+ f64 before, after;
+
+ clib_time_init (&tm->clib_time);
+
+ tw_timer_wheel_init_2t_1w_2048sl (&tm->single_wheel,
+ expired_timer_single_callback,
+ 1.0 /* timer interval */ );
+
+ /* Prime offset */
+ initial_wheel_offset = 757;
+
+ run_single_wheel (&tm->single_wheel, initial_wheel_offset);
+
+ fformat (stdout, "test %d timers, %d iter, %d ticks per iter, 0x%x seed\n",
+ tm->ntimers, tm->niter, tm->ticks_per_iter, tm->seed);
+
+ before = clib_time_now (&tm->clib_time);
+
+ /* Prime the pump */
+ for (i = 0; i < tm->ntimers; i++)
+ {
+ pool_get (tm->test_elts, e);
+ memset (e, 0, sizeof (*e));
+
+ do
+ {
+ expiration_time = random_u32 (&tm->seed) & (2047);
+ }
+ while (expiration_time == 0);
+
+ if (expiration_time > max_expiration_time)
+ max_expiration_time = expiration_time;
+
+ e->expected_to_expire = expiration_time + initial_wheel_offset;
+ e->stop_timer_handle =
+ tw_timer_start_2t_1w_2048sl (&tm->single_wheel, e - tm->test_elts,
+ 1 /* timer id */ ,
+ expiration_time);
+ }
+
+ adds += i;
+
+ for (i = 0; i < tm->niter; i++)
+ {
+ run_single_wheel (&tm->single_wheel, tm->ticks_per_iter);
+
+ j = 0;
+ vec_reset_length (deleted_indices);
+ /* *INDENT-OFF* */
+ pool_foreach (e, tm->test_elts,
+ ({
+ tw_timer_stop_2t_1w_2048sl (&tm->single_wheel, e->stop_timer_handle);
+ vec_add1 (deleted_indices, e - tm->test_elts);
+ if (++j >= tm->ntimers / 4)
+ goto del_and_re_add;
+ }));
+ /* *INDENT-ON* */
+
+ del_and_re_add:
+ for (j = 0; j < vec_len (deleted_indices); j++)
+ pool_put_index (tm->test_elts, deleted_indices[j]);
+
+ deletes += j;
+
+ for (j = 0; j < tm->ntimers / 4; j++)
+ {
+ pool_get (tm->test_elts, e);
+ memset (e, 0, sizeof (*e));
+
+ do
+ {
+ expiration_time = random_u32 (&tm->seed) & (2047);
+ }
+ while (expiration_time == 0);
+
+ if (expiration_time > max_expiration_time)
+ max_expiration_time = expiration_time;
+
+ e->expected_to_expire =
+ expiration_time + tm->single_wheel.current_tick;
+ e->stop_timer_handle = tw_timer_start_2t_1w_2048sl
+ (&tm->single_wheel, e - tm->test_elts, 1 /* timer id */ ,
+ expiration_time);
+ }
+ adds += j;
+ }
+
+ vec_free (deleted_indices);
+
+ run_single_wheel (&tm->single_wheel, max_expiration_time + 1);
+
+ after = clib_time_now (&tm->clib_time);
+
+ fformat (stdout, "%d adds, %d deletes, %d ticks\n", adds, deletes,
+ tm->single_wheel.current_tick);
+ fformat (stdout, "test ran %.2f seconds, %.2f ops/second\n",
+ (after - before),
+ ((f64) adds + (f64) deletes +
+ (f64) tm->single_wheel.current_tick) / (after - before));
+
+ if (pool_elts (tm->test_elts))
+ fformat (stdout, "Note: %d elements remain in pool\n",
+ pool_elts (tm->test_elts));
+
+ /* *INDENT-OFF* */
+ pool_foreach (e, tm->test_elts,
+ ({
+ fformat (stdout, "[%d] expected to expire %d\n",
+ e - tm->test_elts,
+ e->expected_to_expire);
+ }));
+ /* *INDENT-ON* */
+
+ pool_free (tm->test_elts);
+ tw_timer_wheel_free_2t_1w_2048sl (&tm->single_wheel);
+ return 0;
+}
+
+static clib_error_t *
+test2_double (tw_timer_test_main_t * tm)
+{
+ u32 i, j;
+ tw_timer_test_elt_t *e;
+ u32 initial_wheel_offset;
+ u32 expiration_time;
+ u32 max_expiration_time = 0;
+ u32 *deleted_indices = 0;
+ u32 adds = 0, deletes = 0;
+ f64 before, after;
+
+ clib_time_init (&tm->clib_time);
+
+ tw_timer_wheel_init_16t_2w_512sl (&tm->double_wheel,
+ expired_timer_double_callback,
+ 1.0 /* timer interval */ );
+
+ /* Prime offset */
+ initial_wheel_offset = 757;
+
+ run_double_wheel (&tm->double_wheel, initial_wheel_offset);
+
+ fformat (stdout, "test %d timers, %d iter, %d ticks per iter, 0x%x seed\n",
+ tm->ntimers, tm->niter, tm->ticks_per_iter, tm->seed);
+
+ before = clib_time_now (&tm->clib_time);
+
+ /* Prime the pump */
+ for (i = 0; i < tm->ntimers; i++)
+ {
+ pool_get (tm->test_elts, e);
+ memset (e, 0, sizeof (*e));
+
+ do
+ {
+ expiration_time = random_u32 (&tm->seed) & ((1 << 17) - 1);
+ }
+ while (expiration_time == 0);
+
+ if (expiration_time > max_expiration_time)
+ max_expiration_time = expiration_time;
+
+ e->expected_to_expire = expiration_time + initial_wheel_offset;
+ e->stop_timer_handle =
+ tw_timer_start_16t_2w_512sl (&tm->double_wheel, e - tm->test_elts,
+ 14 /* timer id */ ,
+ expiration_time);
+ }
+
+ adds += i;
+
+ for (i = 0; i < tm->niter; i++)
+ {
+ run_double_wheel (&tm->double_wheel, tm->ticks_per_iter);
+
+ j = 0;
+ vec_reset_length (deleted_indices);
+ /* *INDENT-OFF* */
+ pool_foreach (e, tm->test_elts,
+ ({
+ tw_timer_stop_16t_2w_512sl (&tm->double_wheel, e->stop_timer_handle);
+ vec_add1 (deleted_indices, e - tm->test_elts);
+ if (++j >= tm->ntimers / 4)
+ goto del_and_re_add;
+ }));
+ /* *INDENT-ON* */
+
+ del_and_re_add:
+ for (j = 0; j < vec_len (deleted_indices); j++)
+ pool_put_index (tm->test_elts, deleted_indices[j]);
+
+ deletes += j;
+
+ for (j = 0; j < tm->ntimers / 4; j++)
+ {
+ pool_get (tm->test_elts, e);
+ memset (e, 0, sizeof (*e));
+
+ do
+ {
+ expiration_time = random_u32 (&tm->seed) & ((1 << 17) - 1);
+ }
+ while (expiration_time == 0);
+
+ if (expiration_time > max_expiration_time)
+ max_expiration_time = expiration_time;
+
+ e->expected_to_expire = expiration_time +
+ tm->double_wheel.current_tick;
+ e->stop_timer_handle = tw_timer_start_16t_2w_512sl
+ (&tm->double_wheel, e - tm->test_elts, 14 /* timer id */ ,
+ expiration_time);
+ }
+ adds += j;
+ }
+
+ vec_free (deleted_indices);
+
+ run_double_wheel (&tm->double_wheel, max_expiration_time + 1);
+
+ after = clib_time_now (&tm->clib_time);
+
+ fformat (stdout, "%d adds, %d deletes, %d ticks\n", adds, deletes,
+ tm->double_wheel.current_tick);
+ fformat (stdout, "test ran %.2f seconds, %.2f ops/second\n",
+ (after - before),
+ ((f64) adds + (f64) deletes +
+ (f64) tm->double_wheel.current_tick) / (after - before));
+
+ if (pool_elts (tm->test_elts))
+ fformat (stdout, "Note: %d elements remain in pool\n",
+ pool_elts (tm->test_elts));
+
+ /* *INDENT-OFF* */
+ pool_foreach (e, tm->test_elts,
+ ({
+ fformat (stdout, "[%d] expected to expire %d\n",
+ e - tm->test_elts,
+ e->expected_to_expire);
+ }));
+ /* *INDENT-ON* */
+
+ pool_free (tm->test_elts);
+ tw_timer_wheel_free_16t_2w_512sl (&tm->double_wheel);
+ return 0;
+}
+
+static clib_error_t *
+test1_single (tw_timer_test_main_t * tm)
+{
+ u32 i;
+ tw_timer_test_elt_t *e;
+ u32 offset;
+
+ tw_timer_wheel_init_2t_1w_2048sl (&tm->single_wheel,
+ expired_timer_single_callback,
+ 1.0 /* timer interval */ );
+
+ /*
+ * Prime offset, to make sure that the wheel starts in a
+ * non-trivial position
+ */
+ offset = 123;
+
+ run_single_wheel (&tm->single_wheel, offset);
+
+ fformat (stdout, "initial wheel time %d, fast index %d\n",
+ tm->single_wheel.current_tick,
+ tm->single_wheel.current_index[TW_TIMER_RING_FAST]);
+
+ for (i = 0; i < tm->ntimers; i++)
+ {
+ u32 expected_to_expire;
+ u32 timer_arg;
+
+ timer_arg = 1 + i;
+ timer_arg &= 2047;
+ if (timer_arg == 0)
+ timer_arg = 1;
+
+ expected_to_expire = timer_arg + offset;
+
+ pool_get (tm->test_elts, e);
+ memset (e, 0, sizeof (*e));
+ e->expected_to_expire = expected_to_expire;
+ e->stop_timer_handle = tw_timer_start_2t_1w_2048sl
+ (&tm->single_wheel, e - tm->test_elts, 1 /* timer id */ ,
+ timer_arg);
+ }
+ run_single_wheel (&tm->single_wheel, tm->ntimers + 3);
+
+ if (pool_elts (tm->test_elts))
+ fformat (stdout, "Note: %d elements remain in pool\n",
+ pool_elts (tm->test_elts));
+
+ /* *INDENT-OFF* */
+ pool_foreach (e, tm->test_elts,
+ ({
+ fformat(stdout, "[%d] expected to expire %d\n",
+ e - tm->test_elts,
+ e->expected_to_expire);
+ }));
+ /* *INDENT-ON* */
+
+ fformat (stdout,
+ "final wheel time %d, fast index %d\n",
+ tm->single_wheel.current_tick,
+ tm->single_wheel.current_index[TW_TIMER_RING_FAST]);
+
+ pool_free (tm->test_elts);
+ tw_timer_wheel_free_2t_1w_2048sl (&tm->single_wheel);
+ return 0;
+}
+
+static clib_error_t *
+test1_double (tw_timer_test_main_t * tm)
+{
+ u32 i;
+ tw_timer_test_elt_t *e;
+ u32 offset;
+
+ tw_timer_wheel_init_16t_2w_512sl (&tm->double_wheel,
+ expired_timer_double_callback,
+ 1.0 /* timer interval */ );
+
+ /*
+ * Prime offset, to make sure that the wheel starts in a
+ * non-trivial position
+ */
+ offset = 227989;
+
+ run_double_wheel (&tm->double_wheel, offset);
+
+ fformat (stdout, "initial wheel time %d, fast index %d\n",
+ tm->double_wheel.current_tick,
+ tm->double_wheel.current_index[TW_TIMER_RING_FAST]);
+
+ for (i = 0; i < tm->ntimers; i++)
+ {
+ pool_get (tm->test_elts, e);
+ memset (e, 0, sizeof (*e));
+
+ e->expected_to_expire = i + offset + 1;
+ e->stop_timer_handle = tw_timer_start_16t_2w_512sl
+ (&tm->double_wheel, e - tm->test_elts, 14 /* timer id */ ,
+ i + 1);
+ }
+ run_double_wheel (&tm->double_wheel, tm->ntimers + 3);
+
+ if (pool_elts (tm->test_elts))
+ fformat (stdout, "Note: %d elements remain in pool\n",
+ pool_elts (tm->test_elts));
+
+ /* *INDENT-OFF* */
+ pool_foreach (e, tm->test_elts,
+ ({
+ fformat(stdout, "[%d] expected to expire %d\n",
+ e - tm->test_elts,
+ e->expected_to_expire);
+ }));
+ /* *INDENT-ON* */
+
+ fformat (stdout,
+ "final wheel time %d, fast index %d\n",
+ tm->double_wheel.current_tick,
+ tm->double_wheel.current_index[TW_TIMER_RING_FAST]);
+
+ pool_free (tm->test_elts);
+ tw_timer_wheel_free_16t_2w_512sl (&tm->double_wheel);
+ return 0;
+}
+
+static clib_error_t *
+timer_test_command_fn (tw_timer_test_main_t * tm, unformat_input_t * input)
+{
+
+ int is_test1 = 0;
+ int num_wheels = 1;
+ int is_test2 = 0;
+
+ memset (tm, 0, sizeof (*tm));
+ /* Default values */
+ tm->ntimers = 100000;
+ tm->seed = 0xDEADDABE;
+ tm->niter = 1000;
+ tm->ticks_per_iter = 727;
+
+ while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (input, "seed %d", &tm->seed))
+ ;
+ else if (unformat (input, "test1"))
+ is_test1 = 1;
+ else if (unformat (input, "test2"))
+ is_test2 = 1;
+ else if (unformat (input, "wheels %d", &num_wheels))
+ ;
+ else if (unformat (input, "ntimers %d", &tm->ntimers))
+ ;
+ else if (unformat (input, "niter %d", &tm->niter))
+ ;
+ else if (unformat (input, "ticks_per_iter %d", &tm->ticks_per_iter))
+ ;
+ }
+
+ if (is_test1 + is_test2 == 0)
+ return clib_error_return (0, "No test specified [test1..n]");
+
+ if (num_wheels < 1 || num_wheels > 2)
+ return clib_error_return (0, "unsupported... 1 or 2 wheels only");
+
+ if (is_test1)
+ {
+ if (num_wheels == 1)
+ return test1_single (tm);
+ else
+ return test1_double (tm);
+ }
+ if (is_test2)
+ {
+ if (num_wheels == 1)
+ return test2_single (tm);
+ else
+ return test2_double (tm);
+ }
+ /* NOTREACHED */
+ return 0;
+}
+
+#ifdef CLIB_UNIX
+int
+main (int argc, char *argv[])
+{
+ unformat_input_t i;
+ clib_error_t *error;
+ tw_timer_test_main_t *tm = &tw_timer_test_main;
+
+ clib_mem_init (0, 3ULL << 30);
+
+ unformat_init_command_line (&i, argv);
+ error = timer_test_command_fn (tm, &i);
+ unformat_free (&i);
+
+ if (error)
+ {
+ clib_error_report (error);
+ return 1;
+ }
+ return 0;
+}
+#endif /* CLIB_UNIX */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/tw_timer_16t_2w_512sl.c b/src/vppinfra/tw_timer_16t_2w_512sl.c
new file mode 100644
index 00000000000..ad1b9a4a4f5
--- /dev/null
+++ b/src/vppinfra/tw_timer_16t_2w_512sl.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2017 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 <vppinfra/error.h>
+#include "tw_timer_16t_2w_512sl.h"
+#include "tw_timer_template.c"
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/tw_timer_16t_2w_512sl.h b/src/vppinfra/tw_timer_16t_2w_512sl.h
new file mode 100644
index 00000000000..93b26d29e20
--- /dev/null
+++ b/src/vppinfra/tw_timer_16t_2w_512sl.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef __included_tw_timer_16t_2w_512sl_h__
+#define __included_tw_timer_16t_2w_512sl_h__
+
+/* ... So that a client app can create multiple wheel geometries */
+#undef TW_TIMER_WHEELS
+#undef TW_SLOTS_PER_RING
+#undef TW_RING_SHIFT
+#undef TW_RING_MASK
+#undef TW_TIMERS_PER_OBJECT
+#undef LOG2_TW_TIMERS_PER_OBJECT
+#undef TW_SUFFIX
+
+#define TW_TIMER_WHEELS 2
+#define TW_SLOTS_PER_RING 512
+#define TW_RING_SHIFT 9
+#define TW_RING_MASK (TW_SLOTS_PER_RING -1)
+#define TW_TIMERS_PER_OBJECT 16
+#define LOG2_TW_TIMERS_PER_OBJECT 4
+#define TW_SUFFIX _16t_2w_512sl
+
+#include <vppinfra/tw_timer_template.h>
+
+#endif /* __included_tw_timer_16t_2w_512sl_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/tw_timer_2t_1w_2048sl.c b/src/vppinfra/tw_timer_2t_1w_2048sl.c
new file mode 100644
index 00000000000..79d293e1dec
--- /dev/null
+++ b/src/vppinfra/tw_timer_2t_1w_2048sl.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2017 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 <vppinfra/error.h>
+#include "tw_timer_2t_1w_2048sl.h"
+#include "tw_timer_template.c"
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/tw_timer_2t_1w_2048sl.h b/src/vppinfra/tw_timer_2t_1w_2048sl.h
new file mode 100644
index 00000000000..d1cf6d07a95
--- /dev/null
+++ b/src/vppinfra/tw_timer_2t_1w_2048sl.h
@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2017 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.
+ */
+
+#ifndef __included_tw_timer_2t_1w_2048sl_h__
+#define __included_tw_timer_2t_1w_2048sl_h__
+
+/* ... So that a client app can create multiple wheel geometries */
+#undef TW_TIMER_WHEELS
+#undef TW_SLOTS_PER_RING
+#undef TW_RING_SHIFT
+#undef TW_RING_MASK
+#undef TW_TIMERS_PER_OBJECT
+#undef LOG2_TW_TIMERS_PER_OBJECT
+#undef TW_SUFFIX
+
+#define TW_TIMER_WHEELS 1
+#define TW_SLOTS_PER_RING 2048
+#define TW_RING_SHIFT 11
+#define TW_RING_MASK (TW_SLOTS_PER_RING -1)
+#define TW_TIMERS_PER_OBJECT 2
+#define LOG2_TW_TIMERS_PER_OBJECT 1
+#define TW_SUFFIX _2t_1w_2048sl
+
+#include <vppinfra/tw_timer_template.h>
+
+#endif /* __included_tw_timer_2t_1w_2048sl_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/tw_timer_template.c b/src/vppinfra/tw_timer_template.c
new file mode 100644
index 00000000000..9aa5624f91f
--- /dev/null
+++ b/src/vppinfra/tw_timer_template.c
@@ -0,0 +1,341 @@
+/*
+ * Copyright (c) 2016 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.
+ */
+
+/** @file
+ * @brief TW timer implementation TEMPLATE ONLY, do not compile directly
+ *
+ *
+ */
+
+static inline u32
+TW (make_internal_timer_handle) (u32 pool_index, u32 timer_id)
+{
+ u32 handle;
+
+ ASSERT (timer_id < TW_TIMERS_PER_OBJECT);
+ ASSERT (pool_index < (1 << (32 - LOG2_TW_TIMERS_PER_OBJECT)));
+
+ handle = (timer_id << (32 - LOG2_TW_TIMERS_PER_OBJECT)) | (pool_index);
+ return handle;
+}
+
+static inline void
+timer_addhead (TWT (tw_timer) * pool, u32 head_index, u32 new_index)
+{
+ TWT (tw_timer) * head = pool_elt_at_index (pool, head_index);
+ TWT (tw_timer) * old_first;
+ u32 old_first_index;
+ TWT (tw_timer) * new;
+
+ new = pool_elt_at_index (pool, new_index);
+
+ if (PREDICT_FALSE (head->next == head_index))
+ {
+ head->next = head->prev = new_index;
+ new->next = new->prev = head_index;
+ return;
+ }
+
+ old_first_index = head->next;
+ old_first = pool_elt_at_index (pool, old_first_index);
+
+ new->next = old_first_index;
+ new->prev = old_first->prev;
+ old_first->prev = new_index;
+ head->next = new_index;
+}
+
+static inline void
+timer_remove (TWT (tw_timer) * pool, u32 index)
+{
+ TWT (tw_timer) * elt = pool_elt_at_index (pool, index);
+ TWT (tw_timer) * next_elt, *prev_elt;
+
+ ASSERT (elt->user_handle != ~0);
+
+ next_elt = pool_elt_at_index (pool, elt->next);
+ prev_elt = pool_elt_at_index (pool, elt->prev);
+
+ next_elt->prev = elt->prev;
+ prev_elt->next = elt->next;
+
+ elt->prev = elt->next = ~0;
+}
+
+/**
+ * @brief Start a Tw Timer
+ * @param tw_timer_wheel_t * tw timer wheel object pointer
+ * @param u32 pool_index user pool index, presumably for a tw session
+ * @param u32 timer_id app-specific timer ID. 4 bits.
+ * @param u32 interval timer interval in ticks
+ * @returns handle needed to cancel the timer
+ */
+u32
+TW (tw_timer_start) (TWT (tw_timer_wheel) * tw, u32 pool_index, u32 timer_id,
+ u32 interval)
+{
+#if TW_TIMER_WHEELS > 1
+ u16 slow_ring_offset;
+ u32 carry;
+#endif
+ u16 fast_ring_offset;
+ tw_timer_wheel_slot_t *ts;
+ TWT (tw_timer) * t;
+
+ ASSERT (interval);
+
+ pool_get (tw->timers, t);
+ t->next = t->prev = ~0;
+#if TW_TIMER_WHEELS > 1
+ t->fast_ring_offset = ~0;
+#endif
+ t->user_handle = TW (make_internal_timer_handle) (pool_index, timer_id);
+
+ fast_ring_offset = interval & TW_RING_MASK;
+ fast_ring_offset += tw->current_index[TW_TIMER_RING_FAST];
+#if TW_TIMER_WHEELS > 1
+ carry = fast_ring_offset >= TW_SLOTS_PER_RING ? 1 : 0;
+ fast_ring_offset %= TW_SLOTS_PER_RING;
+ slow_ring_offset = (interval >> TW_RING_SHIFT) + carry;
+
+ /* Timer duration exceeds ~7 hrs? Oops */
+ ASSERT (slow_ring_offset < TW_SLOTS_PER_RING);
+
+ /* Timer expires more than 51.2 seconds from now? */
+ if (slow_ring_offset)
+ {
+ slow_ring_offset += tw->current_index[TW_TIMER_RING_SLOW];
+ slow_ring_offset %= TW_SLOTS_PER_RING;
+
+ /* We'll want the fast ring offset later... */
+ t->fast_ring_offset = fast_ring_offset;
+ ASSERT (t->fast_ring_offset < TW_SLOTS_PER_RING);
+
+ ts = &tw->w[TW_TIMER_RING_SLOW][slow_ring_offset];
+
+ timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+
+ return t - tw->timers;
+ }
+#else
+ fast_ring_offset %= TW_SLOTS_PER_RING;
+ ASSERT (interval < TW_SLOTS_PER_RING);
+#endif
+
+ /* Timer expires less than one fast-ring revolution from now */
+ ts = &tw->w[TW_TIMER_RING_FAST][fast_ring_offset];
+
+ timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+ return t - tw->timers;
+}
+
+/**
+ * @brief Stop a tw timer
+ * @param tw_timer_wheel_t * tw timer wheel object pointer
+ * @param u32 pool_index user pool index, passed for consistency checking only
+ * @param u32 timer_id 4 bit timer ID, passed for consistency checking only
+ * @param u32 handle timer cancellation returned by tw_timer_start
+ */
+
+void TW (tw_timer_stop) (TWT (tw_timer_wheel) * tw, u32 handle)
+{
+ TWT (tw_timer) * t;
+
+ t = pool_elt_at_index (tw->timers, handle);
+
+ /* in case of idiotic handle (e.g. passing a listhead index) */
+ ASSERT (t->user_handle != ~0);
+
+ timer_remove (tw->timers, handle);
+
+ pool_put_index (tw->timers, handle);
+}
+
+/**
+ * @brief Initialize a tw timer wheel template instance
+ * @param tw_timer_wheel_t * tw timer wheel object pointer
+ * @param void * expired_timer_callback. Passed a u32 * vector of
+ * expired timer handles.
+ * @param f64 timer_interval_in_seconds
+ */
+void
+TW (tw_timer_wheel_init) (TWT (tw_timer_wheel) * tw,
+ void *expired_timer_callback,
+ f64 timer_interval_in_seconds)
+{
+ int ring, slot;
+ tw_timer_wheel_slot_t *ts;
+ TWT (tw_timer) * t;
+ memset (tw, 0, sizeof (*tw));
+ tw->expired_timer_callback = expired_timer_callback;
+ if (timer_interval_in_seconds == 0.0)
+ {
+ clib_warning ("timer interval is zero");
+ abort ();
+ }
+ tw->timer_interval = timer_interval_in_seconds;
+ tw->ticks_per_second = 1.0 / timer_interval_in_seconds;
+
+ for (ring = 0; ring < TW_TIMER_WHEELS; ring++)
+ {
+ for (slot = 0; slot < TW_SLOTS_PER_RING; slot++)
+ {
+ ts = &tw->w[ring][slot];
+ pool_get (tw->timers, t);
+ memset (t, 0xff, sizeof (*t));
+ t->next = t->prev = t - tw->timers;
+ ts->head_index = t - tw->timers;
+ }
+ }
+}
+
+/**
+ * @brief Free a tw timer wheel template instance
+ * @param tw_timer_wheel_t * tw timer wheel object pointer
+ */
+void TW (tw_timer_wheel_free) (TWT (tw_timer_wheel) * tw)
+{
+ int i, j;
+ tw_timer_wheel_slot_t *ts;
+ TWT (tw_timer) * head, *t;
+ u32 next_index;
+
+ for (i = 0; i < TW_TIMER_WHEELS; i++)
+ {
+ for (j = 0; j < TW_SLOTS_PER_RING; j++)
+ {
+ ts = &tw->w[i][j];
+ head = pool_elt_at_index (tw->timers, ts->head_index);
+ next_index = head->next;
+
+ while (next_index != ts->head_index)
+ {
+ t = pool_elt_at_index (tw->timers, next_index);
+ next_index = t->next;
+ pool_put (tw->timers, t);
+ }
+ pool_put (tw->timers, head);
+ }
+ }
+ memset (tw, 0, sizeof (*tw));
+}
+
+/**
+ * @brief Advance a tw timer wheel. Calls the expired timer callback
+ * as needed. This routine should be called once every timer_interval seconds
+ * @param tw_timer_wheel_t * tw timer wheel template instance pointer
+ * @param f64 now the current time, e.g. from vlib_time_now(vm)
+ */
+void TW (tw_timer_expire_timers) (TWT (tw_timer_wheel) * tw, f64 now)
+{
+ u32 nticks, i;
+ tw_timer_wheel_slot_t *ts;
+ TWT (tw_timer) * t, *head;
+ u32 fast_wheel_index;
+ u32 next_index;
+#if TW_TIMER_WHEELS > 1
+ u32 slow_wheel_index;
+#endif
+
+ /* Shouldn't happen */
+ if (PREDICT_FALSE (now < tw->next_run_time))
+ return;
+
+ /* Number of ticks which have occurred */
+ nticks = tw->ticks_per_second * (now - tw->last_run_time);
+ if (nticks == 0)
+ return;
+
+ /* Remember when we ran, compute next runtime */
+ tw->next_run_time = (now + tw->timer_interval);
+ tw->last_run_time = now;
+
+ for (i = 0; i < nticks; i++)
+ {
+ fast_wheel_index = tw->current_index[TW_TIMER_RING_FAST];
+
+ /*
+ * If we've been around the fast ring once,
+ * process one slot in the slow ring before we handle
+ * the fast ring.
+ */
+ if (PREDICT_FALSE (fast_wheel_index == TW_SLOTS_PER_RING))
+ {
+ fast_wheel_index = tw->current_index[TW_TIMER_RING_FAST] = 0;
+
+#if TW_TIMER_WHEELS > 1
+ tw->current_index[TW_TIMER_RING_SLOW]++;
+ tw->current_index[TW_TIMER_RING_SLOW] %= TW_SLOTS_PER_RING;
+ slow_wheel_index = tw->current_index[TW_TIMER_RING_SLOW];
+
+ ts = &tw->w[TW_TIMER_RING_SLOW][slow_wheel_index];
+
+ head = pool_elt_at_index (tw->timers, ts->head_index);
+ next_index = head->next;
+
+ /* Make slot empty */
+ head->next = head->prev = ts->head_index;
+
+ /* traverse slot, deal timers into fast ring */
+ while (next_index != head - tw->timers)
+ {
+ t = pool_elt_at_index (tw->timers, next_index);
+ next_index = t->next;
+
+ /* Remove from slow ring slot (hammer) */
+ t->next = t->prev = ~0;
+ ASSERT (t->fast_ring_offset < TW_SLOTS_PER_RING);
+ /* Add to fast ring */
+ ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
+ timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+ }
+#endif
+ }
+
+ /* Handle the fast ring */
+ vec_reset_length (tw->expired_timer_handles);
+
+ ts = &tw->w[TW_TIMER_RING_FAST][fast_wheel_index];
+
+ head = pool_elt_at_index (tw->timers, ts->head_index);
+ next_index = head->next;
+
+ /* Make slot empty */
+ head->next = head->prev = ts->head_index;
+
+ /* Construct vector of expired timer handles to give the user */
+ while (next_index != ts->head_index)
+ {
+ t = pool_elt_at_index (tw->timers, next_index);
+ next_index = t->next;
+ vec_add1 (tw->expired_timer_handles, t->user_handle);
+ pool_put (tw->timers, t);
+ }
+
+ /* If any timers expired, tell the user */
+ if (vec_len (tw->expired_timer_handles))
+ tw->expired_timer_callback (tw->expired_timer_handles);
+ tw->current_index[TW_TIMER_RING_FAST]++;
+ tw->current_tick++;
+ }
+}
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
diff --git a/src/vppinfra/tw_timer_template.h b/src/vppinfra/tw_timer_template.h
new file mode 100644
index 00000000000..cf15ab8a667
--- /dev/null
+++ b/src/vppinfra/tw_timer_template.h
@@ -0,0 +1,199 @@
+/*
+ * Copyright (c) 2016 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.
+ */
+
+#ifndef TW_SUFFIX
+#error do not include tw_timer_template.h directly
+#endif
+
+#include <vppinfra/clib.h>
+#include <vppinfra/pool.h>
+
+#ifndef _twt
+#define _twt(a,b) a##b##_t
+#define __twt(a,b) _twt(a,b)
+#define TWT(a) __twt(a,TW_SUFFIX)
+
+#define _tw(a,b) a##b
+#define __tw(a,b) _tw(a,b)
+#define TW(a) __tw(a,TW_SUFFIX)
+#endif
+
+/** @file
+ @brief TW timer template header file, do not compile directly
+
+Instantiation of tw_timer_template.h generates named structures to
+implement specific timer wheel geometries. Choices include: number of
+timer wheels (currently, 1 or 2), number of slots per ring (a power of
+two), and the number of timers per "object handle".
+
+Internally, user object/timer handles are 32-bit integers, so if one
+selects 16 timers/object (4 bits), the resulting timer wheel handle is
+limited to 2**28 objects.
+
+Here are the specific settings required to generate a single 2048 slot
+wheel which supports 2 timers per object:
+
+ #define TW_TIMER_WHEELS 1
+ #define TW_SLOTS_PER_RING 2048
+ #define TW_RING_SHIFT 11
+ #define TW_RING_MASK (TW_SLOTS_PER_RING -1)
+ #define TW_TIMERS_PER_OBJECT 2
+ #define LOG2_TW_TIMERS_PER_OBJECT 1
+ #define TW_SUFFIX _2t_1w_2048sl
+
+See tw_timer_2t_1w_2048sl.h for a complete
+example.
+
+tw_timer_template.h is not intended to be #included directly. Client
+codes can include multiple timer geometry header files, although
+extreme caution would required to use the TW and TWT macros in such a
+case.
+
+API usage example:
+
+Initialize a two-timer, single 2048-slot wheel w/ a 1-second
+timer granularity:
+
+ tw_timer_wheel_init_2t_1w_2048sl (&tm->single_wheel,
+ expired_timer_single_callback,
+ 1.0 / * timer interval * / );
+
+Start a timer:
+
+ handle = tw_timer_start_2t_1w_2048sl (&tm->single_wheel, elt_index,
+ [0 | 1] / * timer id * / ,
+ expiration_time_in_u32_ticks);
+
+Stop a timer:
+
+ tw_timer_stop_2t_1w_2048sl (&tm->single_wheel, handle);
+
+Expired timer callback:
+
+ static void
+ expired_timer_single_callback (u32 * expired_timers)
+ {
+ int i;
+ u32 pool_index, timer_id;
+ tw_timer_test_elt_t *e;
+ tw_timer_test_main_t *tm = &tw_timer_test_main;
+
+ for (i = 0; i < vec_len (expired_timers);
+ {
+ pool_index = expired_timers[i] & 0x7FFFFFFF;
+ timer_id = expired_timers[i] >> 31;
+
+ ASSERT (timer_id == 1);
+
+ e = pool_elt_at_index (tm->test_elts, pool_index);
+
+ if (e->expected_to_expire != tm->single_wheel.current_tick)
+ {
+ fformat (stdout, "[%d] expired at %d not %d\n",
+ e - tm->test_elts, tm->single_wheel.current_tick,
+ e->expected_to_expire);
+ }
+ pool_put (tm->test_elts, e);
+ }
+ }
+ */
+
+typedef struct
+{
+ /** next, previous pool indices */
+ u32 next;
+ u32 prev;
+#if TW_TIMER_WHEELS > 0
+ /** fast ring offset, only valid in the slow ring */
+ u16 fast_ring_offset;
+ u16 pad;
+#endif
+ /** user timer handle */
+ u32 user_handle;
+} TWT (tw_timer);
+
+/*
+ * These structures ar used by all geometries,
+ * so they need a private #include block...
+ */
+#ifndef __defined_tw_timer_wheel_slot__
+#define __defined_tw_timer_wheel_slot__
+typedef struct
+{
+ /** Listhead of timers which expire in this interval */
+ u32 head_index;
+} tw_timer_wheel_slot_t;
+typedef enum
+{
+ /** Fast timer ring ID */
+ TW_TIMER_RING_FAST,
+ /** Slow timer ring ID */
+ TW_TIMER_RING_SLOW,
+} tw_ring_index_t;
+#endif /* __defined_tw_timer_wheel_slot__ */
+
+typedef struct
+{
+ /** Timer pool */
+ TWT (tw_timer) * timers;
+
+ /** Next time the wheel should run */
+ f64 next_run_time;
+
+ /** Last time the wheel ran */
+ f64 last_run_time;
+
+ /** Timer ticks per second */
+ f64 ticks_per_second;
+
+ /** Timer interval, also needed to avoid fp divide in speed path */
+ f64 timer_interval;
+
+ /** current tick */
+ u32 current_tick;
+
+ /** current wheel indices */
+ u32 current_index[TW_TIMER_WHEELS];
+
+ /** wheel arrays */
+ tw_timer_wheel_slot_t w[TW_TIMER_WHEELS][TW_SLOTS_PER_RING];
+
+ /** expired timer callback, receives a vector of handles */
+ void (*expired_timer_callback) (u32 * expired_timer_handles);
+
+ /** vector of expired timers */
+ u32 *expired_timer_handles;
+} TWT (tw_timer_wheel);
+
+u32 TW (tw_timer_start) (TWT (tw_timer_wheel) * tw,
+ u32 pool_index, u32 timer_id, u32 interval);
+
+void TW (tw_timer_stop) (TWT (tw_timer_wheel) * tw, u32 handle);
+
+void TW (tw_timer_wheel_init) (TWT (tw_timer_wheel) * tw,
+ void *expired_timer_callback,
+ f64 timer_interval);
+
+void TW (tw_timer_wheel_free) (TWT (tw_timer_wheel) * tw);
+
+void TW (tw_timer_expire_timers) (TWT (tw_timer_wheel) * tw, f64 now);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */