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timeval: Wake up all threads when time is warped.

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This commit makes the main thread wake up all other threads when time is
warped.

Signed-off-by: Alex Wang <alexw@nicira.com>
Signed-off-by: Ethan Jackson <ethan@nicira.com>
Acked-by: Ben Pfaff <blp@nicira.com>
Acked-by: Ethan Jackson <ethan@nicira.com>
This commit is contained in:
Alex Wang
2013-10-09 04:30:36 +00:00
committed by Ethan Jackson
parent 47aaca8823
commit 53d98a1e9c
3 changed files with 28 additions and 1 deletions
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26
lib/timeval.c
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@@ -33,6 +33,7 @@
#include "hmap.h"
#include "ovs-thread.h"
#include "signals.h"
#include "seq.h"
#include "unixctl.h"
#include "util.h"
#include "vlog.h"
@@ -57,6 +58,14 @@ static struct clock wall_clock; /* CLOCK_REALTIME. */
/* The monotonic time at which the time module was initialized. */
static long long int boot_time;
/* True only when timeval_dummy_register() is called. */
static bool timewarp_enabled;
/* Reference to the seq struct. Threads other than main thread can
* wait on timewarp_seq and be waken up when time is warped. */
static struct seq *timewarp_seq;
/* Last value of 'timewarp_seq'. */
DEFINE_STATIC_PER_THREAD_DATA(uint64_t, last_seq, 0);
/* Monotonic time in milliseconds at which to die with SIGALRM (if not
* LLONG_MAX). */
static long long int deadline = LLONG_MAX;
@@ -79,6 +88,7 @@ init_clock(struct clock *c, clockid_t id)
ovs_mutex_init(&c->mutex);
atomic_init(&c->slow_path, false);
xclock_gettime(c->id, &c->cache);
timewarp_seq = seq_create();
}
static void
@@ -313,6 +323,19 @@ xclock_gettime(clock_t id, struct timespec *ts)
}
}
/* Makes threads wait on timewarp_seq and be waken up when time is warped.
* This function will be no-op unless timeval_dummy_register() is called. */
void
timewarp_wait(void)
{
if (timewarp_enabled) {
uint64_t *last_seq = last_seq_get();
*last_seq = seq_read(timewarp_seq);
seq_wait(timewarp_seq, *last_seq);
}
}
static long long int
timeval_diff_msec(const struct timeval *a, const struct timeval *b)
{
@@ -511,13 +534,14 @@ timeval_warp_cb(struct unixctl_conn *conn,
atomic_store(&monotonic_clock.slow_path, true);
timespec_add(&monotonic_clock.warp, &monotonic_clock.warp, &ts);
ovs_mutex_unlock(&monotonic_clock.mutex);
seq_change(timewarp_seq);
unixctl_command_reply(conn, "warped");
}
void
timeval_dummy_register(void)
{
timewarp_enabled = true;
unixctl_command_register("time/stop", "", 0, 0, timeval_stop_cb, NULL);
unixctl_command_register("time/warp", "MSECS", 1, 1,
timeval_warp_cb, NULL);