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timeval: Add ability to fast-forward time, for unit testing.

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Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2011-12-07 13:15:54 -08:00
parent cee03df4f5
commit 6197af6e4b
2 changed files with 56 additions and 1 deletions
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54
lib/timeval.c
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@@ -20,13 +20,16 @@
#include <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include "coverage.h"
#include "dummy.h"
#include "fatal-signal.h"
#include "signals.h"
#include "unixctl.h"
#include "util.h"
#include "vlog.h"
@@ -48,6 +51,9 @@ static volatile sig_atomic_t monotonic_tick = true;
static struct timespec wall_time;
static struct timespec monotonic_time;
/* Fixed monotonic time offset, for use by unit tests. */
static struct timespec warp_offset;
/* Time at which to die with SIGALRM (if not TIME_MIN). */
static time_t deadline = TIME_MIN;
@@ -62,6 +68,8 @@ static void unblock_sigalrm(const sigset_t *);
static void log_poll_interval(long long int last_wakeup);
static struct rusage *get_recent_rusage(void);
static void refresh_rusage(void);
static void timespec_add(struct timespec *sum,
const struct timespec *a, const struct timespec *b);
/* Initializes the timetracking module.
*
@@ -180,6 +188,7 @@ refresh_monotonic(void)
refresh_wall_if_ticked();
monotonic_time = wall_time;
}
timespec_add(&monotonic_time, &monotonic_time, &warp_offset);
monotonic_tick = false;
}
@@ -407,6 +416,23 @@ timeval_diff_msec(const struct timeval *a, const struct timeval *b)
return timeval_to_msec(a) - timeval_to_msec(b);
}
static void
timespec_add(struct timespec *sum,
const struct timespec *a,
const struct timespec *b)
{
struct timespec tmp;
tmp.tv_sec = a->tv_sec + b->tv_sec;
tmp.tv_nsec = a->tv_nsec + b->tv_nsec;
if (tmp.tv_nsec >= 1000 * 1000 * 1000) {
tmp.tv_nsec -= 1000 * 1000 * 1000;
tmp.tv_sec++;
}
*sum = tmp;
}
static void
log_poll_interval(long long int last_wakeup)
{
@@ -522,3 +548,31 @@ get_cpu_usage(void)
{
return cpu_usage;
}
/* Unixctl interface. */
static void
timeval_warp_cb(struct unixctl_conn *conn,
int argc OVS_UNUSED, const char *argv[], void *aux OVS_UNUSED)
{
struct timespec ts;
int msecs;
msecs = atoi(argv[1]);
if (msecs <= 0) {
unixctl_command_reply(conn, 501, "invalid MSECS");
return;
}
ts.tv_sec = msecs / 1000;
ts.tv_nsec = (msecs % 1000) * 1000 * 1000;
timespec_add(&warp_offset, &warp_offset, &ts);
unixctl_command_reply(conn, 200, "warped");
}
void
timeval_dummy_register(void)
{
unixctl_command_register("time/warp", "MSECS", 1, 1,
timeval_warp_cb, NULL);
}