d6d439f3f7
* Fixes sharing semantics, so non-shared semaphores in non-shared memory do not become shared after a fork. * Adds two new system calls: _user_mutex_sem_acquire/release(), which reuse the user_mutex address-hashed wait mechanism. * Named semaphores continue to use traditional sem_id semaphores.
45 lines
892 B
C
45 lines
892 B
C
/*
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* Copyright 2008-2015 Haiku, Inc.
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* Distributed under the terms of the MIT License.
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*/
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#ifndef _SEMAPHORE_H_
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#define _SEMAPHORE_H_
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#include <fcntl.h>
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#include <stdint.h>
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#include <sys/cdefs.h>
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#include <time.h>
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typedef struct _sem_t {
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int32_t type;
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union {
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int32_t named_sem_id;
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int32_t unnamed_sem;
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} u;
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int32_t padding[2];
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} sem_t;
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#define SEM_FAILED ((sem_t*)(long)-1)
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__BEGIN_DECLS
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sem_t* sem_open(const char* name, int openFlags,...);
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int sem_close(sem_t* semaphore);
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int sem_unlink(const char* name);
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int sem_init(sem_t* semaphore, int shared, unsigned value);
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int sem_destroy(sem_t* semaphore);
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int sem_post(sem_t* semaphore);
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int sem_timedwait(sem_t* semaphore, const struct timespec* timeout);
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int sem_trywait(sem_t* semaphore);
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int sem_wait(sem_t* semaphore);
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int sem_getvalue(sem_t* semaphore, int* value);
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__END_DECLS
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#endif /* _SEMAPHORE_H_ */
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