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8infy
35 lines
724 B
C
35 lines
724 B
C
#ifndef _SEMAPHORE_H
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#define _SEMAPHORE_H
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#include <stddef.h>
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#include <stdbool.h>
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#include <spinlock.h>
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#include <time.h>
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#define SEM_TAIL 0
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#define SEM_HEAD 1
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typedef struct semaphore_t{
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int i;
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spinlock_t lock;
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struct thread_t *tail;
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struct thread_t *head;
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} semaphore_t;
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#define SEMAPHORE_INIT(x, v) { \
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(x)->i = v; \
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SPINLOCK_INIT((x)->lock); \
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(x)->tail = NULL; \
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(x)->head = NULL; \
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}
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int semaphore_wait(semaphore_t *sem, bool interruptible);
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int semaphore_timedwait(semaphore_t *sem, time_t timeoutusec, bool interruptible);
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void semaphore_signal(semaphore_t *sem);
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void semaphore_reset(semaphore_t *sem);
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bool semaphore_test(semaphore_t *sem);
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bool semaphore_haswaiters(semaphore_t *sem);
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#endif
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