diff options
Diffstat (limited to 'libgps_shm.c')
| -rw-r--r-- | libgps_shm.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/libgps_shm.c b/libgps_shm.c index 90e962c8..bc245bea 100644 --- a/libgps_shm.c +++ b/libgps_shm.c @@ -75,9 +75,10 @@ int gps_shm_open(/*@out@*/struct gps_data_t *gpsdata) bool gps_shm_waiting(const struct gps_data_t *gpsdata, int timeout) /* check to see if new data has been written */ +/* timeout is in uSec */ { volatile struct shmexport_t *shared = (struct shmexport_t *)PRIVATE(gpsdata)->shmseg; - timestamp_t basetime = timestamp(); + timestamp_t endtime = timestamp() + (((double)timeout)/1000000);; volatile bool newdata = false; /* busy-waiting sucks, but there's not really an alternative */ @@ -90,7 +91,7 @@ bool gps_shm_waiting(const struct gps_data_t *gpsdata, int timeout) memory_barrier(); if (bookend1 == bookend2 && bookend1 > PRIVATE(gpsdata)->tick) newdata = true; - if (newdata || (timestamp() - basetime >= (double)timeout)) + if (newdata || (timestamp() >= endtime)) break; } |