From: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
The event_wait() function uses the CLOCK_REALTIME time base for
calculating expiration times (default time base for gettimeofday()).
Using the CLOCK_REALTIME time base can introduce incorrect expiration
timeout calculations if the REALTIME clock changes, making a timeout
too long (possibly hours or days), or too short.
Update time base usage to the CLOCK_MONOTONIC time base to avoid time
change issues.
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@xxxxxxxxx>
---
ibacm/linux/osd.h | 20 +++++++++++---------
1 files changed, 11 insertions(+), 9 deletions(-)
diff --git a/ibacm/linux/osd.h b/ibacm/linux/osd.h
index eabf5ed..1617176 100644
--- a/ibacm/linux/osd.h
+++ b/ibacm/linux/osd.h
@@ -88,20 +88,23 @@ typedef struct { volatile int val; } atomic_t;
typedef struct { pthread_cond_t cond; pthread_mutex_t mutex; } event_t;
static inline void event_init(event_t *e)
{
- pthread_cond_init(&e->cond, NULL);
+ pthread_condattr_t attr;
+
+ pthread_condattr_init(&attr);
+ pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
+ pthread_cond_init(&e->cond, &attr);
pthread_mutex_init(&e->mutex, NULL);
}
#define event_signal(e) pthread_cond_signal(&(e)->cond)
#define ONE_SEC_IN_NSEC 1000000000ULL
static inline int event_wait(event_t *e, int timeout)
{
- struct timeval curtime;
struct timespec wait;
int ret;
- gettimeofday(&curtime, NULL);
- wait.tv_sec = curtime.tv_sec + ((unsigned) timeout) / 1000;
- wait.tv_nsec = (curtime.tv_usec + (((unsigned) timeout) % 1000) * 1000) * 1000;
+ clock_gettime(CLOCK_MONOTONIC, &wait);
+ wait.tv_sec = wait.tv_sec + ((unsigned int) timeout) / 1000;
+ wait.tv_nsec = (wait.tv_nsec + (((unsigned int) timeout) % 1000) * 1000000);
if (wait.tv_nsec > ONE_SEC_IN_NSEC) {
wait.tv_sec++;
wait.tv_nsec -= ONE_SEC_IN_NSEC;
@@ -114,10 +117,9 @@ static inline int event_wait(event_t *e, int timeout)
static inline uint64_t time_stamp_us(void)
{
- struct timeval curtime;
- timerclear(&curtime);
- gettimeofday(&curtime, NULL);
- return (uint64_t) curtime.tv_sec * 1000000 + (uint64_t) curtime.tv_usec;
+ struct timespec t;
+ clock_gettime(CLOCK_MONOTONIC, &t);
+ return (t.tv_sec * ONE_SEC_IN_NSEC + t.tv_nsec) / 1000;
}
#define time_stamp_ms() (time_stamp_us() / (uint64_t) 1000)
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
