rt-thread-official/components/pthreads/semaphore.h

#ifndef __POSIX_SEMAPHORE_H__
#define __POSIX_SEMAPHORE_H__

#include <rtthread.h>
#include <sys/time.h>

struct posix_sem
{
	/* reference count and unlinked */
	rt_uint16_t refcount;
	rt_uint8_t unlinked;
	rt_uint8_t unamed;

	/* RT-Thread semaphore */
	rt_sem_t sem;

	/* next posix semaphore */
	struct posix_sem* next;
};
typedef struct posix_sem posix_sem_t;

struct semdes
{
	rt_uint32_t flags;
	posix_sem_t* sem;
};
typedef struct semdes sem_t;

int sem_close(sem_t *sem);
int sem_destroy(sem_t *sem);
int sem_getvalue(sem_t *sem, int *sval);
int sem_init(sem_t *sem, int pshared, unsigned int value);
sem_t *sem_open(const char *name, int oflag, ...);
int sem_post(sem_t *sem);
int sem_timedwait(sem_t *sem, const struct timespec *abs_timeout);
int sem_trywait(sem_t *sem);
int sem_unlink(const char *name);
int sem_wait(sem_t *sem);

#endif