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Add a start time to sem_tickwait() to account for any elapsed time before the timer is actually started

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This commit is contained in:
Gregory Nutt
2015-08-01 14:57:31 -06:00
parent 030573ba5c
commit ffec6124f2
2 changed files with 31 additions and 9 deletions
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include/nuttx/semaphore.h
+8 -3
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@@ -94,8 +94,13 @@ extern "C"
*
* Parameters:
* sem - Semaphore object
* ticks - Ticks to wait until the semaphore is posted. If ticks is
* zero, then this function is equivalent to sem_trywait().
* start - The system time that the delay is relative to. If the
* current time is not the same as the start time, then the
* delay will be adjust so that the end time will be the same
* in any event.
* delay - Ticks to wait from the start time until the semaphore is
* posted. If ticks is zero, then this function is equivalent
* to sem_trywait().
*
* Return Value:
* Zero (OK) is returned on success. A negated errno value is returned on
@@ -103,7 +108,7 @@ extern "C"
*
****************************************************************************/
int sem_tickwait(FAR sem_t *sem, uint32_t ticks);
int sem_tickwait(FAR sem_t *sem, uint32_t start, uint32_t delay);
#undef EXTERN
#ifdef __cplusplus