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posix: semaphore: fix bugs and simplify code

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Modifies several functions that are causing wrong
behaviour.

 * semaphore.h: add missing restrict keyword.
 * sem_destroy(): check that nobody is waiting
   before destroying the object.
 * sem_timedwait(): simpify function logic and
   fix a bug when abstime > currtime, that passed
   ticks instead of ms to k_sem_take().
 * sem_wait(): avoid unnecessary checks.
 * sem_init(): add pshared value assertion.

Signed-off-by: Juan Manuel Torres Palma <j.m.torrespalma@gmail.com>
This commit is contained in:
Juan Manuel Torres Palma 2018-03-16 15:35:27 +09:00 • committed by Andrew Boie
commit 342da7ac72
2 changed files with 29 additions and 50 deletions
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4
include/posix/semaphore.h
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@ -14,10 +14,10 @@ extern "C" {
#include <time.h>
int sem_destroy(sem_t *semaphore);
int sem_getvalue(sem_t *semaphore, int *value);
int sem_getvalue(sem_t *restrict semaphore, int *restrict value);
int sem_init(sem_t *semaphore, int pshared, unsigned int value);
int sem_post(sem_t *semaphore);
int sem_timedwait(sem_t *semaphore, struct timespec *abstime);
int sem_timedwait(sem_t *restrict semaphore, struct timespec *restrict abstime);
int sem_trywait(sem_t *semaphore);
int sem_wait(sem_t *semaphore);