sam7fc/include/rtos/semaphore.h

#ifndef _SEMSPHORE_H_
#define _SEMSPHORE_H_

#include <stdint.h>

#include "rtos/context.h"
#include "rtos/spinlock.h"

struct semaphore {
	struct context *sleep_queue;
	struct spinlock lock;
	int32_t count;
};

uint8_t sem_wait(struct semaphore *sem);
void sem_post(struct semaphore *sem);

void sem_interrupt(struct semaphore *sem, struct context *c);
int32_t sem_get_count(struct semaphore *sem);
void sem_init(struct semaphore *sem, int32_t count);

#endif /* _SEMSPHORE_H_ */