semaphore.h

 
#ifndef KERNEL_SEMAPHORE_H
#define KERNEL_SEMAPHORE_H
 
#include <kernel/spinlock.h>
#include <kernel/waitqueue.h>
 
struct semaphore {
    spinlock_t lock;
    struct waitqueue waitqueue;
    unsigned int count;
};
 
typedef struct semaphore semaphore_t;
 
#define INIT_SEMAPHORE(_name, _count)                   \
    _name = ((struct semaphore){                        \
        .count = (_count),                              \
        __INIT_SPINLOCK(.lock),                         \
        .waitqueue = __WAITQUEUE_INIT(_name.waitqueue), \
    })
 
#define DECLARE_SEMAPHORE(_name, _count) \
    struct semaphore _name = SEMAPHORE_INIT(_count)
 
#define INIT_MUTEX(_name) INIT_SEMAPHORE(_name, 1)
 
#define DECLARE_MUTEX(_name) semaphore_t INIT_MUTEX(_name)
 
struct semaphore *semaphore_acquire(struct semaphore *);
 
void semaphore_release(struct semaphore *);
 
#endif /* KERNEL_SEMAPHORE_H */