mirror of https://github.com/diegocr/libnix.git
83 lines
1.9 KiB
C
83 lines
1.9 KiB
C
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/**
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* POSIX Semaphores Emulation for AmigaOS
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* Copyright (C)2009 Diego Casorran
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*
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* Public Domain as long this copyright notice is left unchanged.
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*
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* Implementation conforms to POSIX.1-2008 where possible.
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*/
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#ifndef _SEMAPHORE_H
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#define _SEMAPHORE_H 1
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#ifndef AMIGA
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# error this header is designed for AmigaOS or compatible systems
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#endif /* !AMIGA */
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#include <sys/types.h>
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#include <sys/time.h>
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/* Value returned if `sem_open' failed. */
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#define SEM_FAILED ((sem_t *) 0L)
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#define SEM_VALUE_MAX (~0U)
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#define __SIZEOF_SEM_T 130
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#if defined(__SIZEOF_SEM_T_PAD)
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# if __SIZEOF_SEM_T_PAD == 0
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# undef __SIZEOF_SEM_T_PAD
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# define __SIZEOF_SEM_T_PAD __SIZEOF_SEM_T
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# elif __SIZEOF_SEM_T_PAD < __SIZEOF_SEM_T
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# undef __SIZEOF_SEM_T_PAD
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# endif
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#endif
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#ifndef __SIZEOF_SEM_T_PAD
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# define __SIZEOF_SEM_T_PAD 256
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#endif
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typedef union {
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char __size[__SIZEOF_SEM_T];
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char __pad[__SIZEOF_SEM_T_PAD];
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} sem_t;
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__BEGIN_DECLS
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/* Initialize semaphore object SEM to VALUE. If PSHARED then share it
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with other processes. */
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extern int sem_init (sem_t *__sem, int __pshared, unsigned int __value);
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/* Free resources associated with semaphore object SEM. */
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extern int sem_destroy (sem_t *__sem);
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/* Open a named semaphore NAME with open flags OFLAG. */
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extern sem_t *sem_open (const char *__name, int __oflag, ...);
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/* Close descriptor for named semaphore SEM. */
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extern int sem_close (sem_t *__sem);
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/* Remove named semaphore NAME. */
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extern int sem_unlink (const char *__name);
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/* Wait for SEM being posted. */
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extern int sem_wait (sem_t *__sem);
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/* Similar to `sem_wait' but wait only until ABSTIME. */
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extern int sem_timedwait (sem_t *__sem, const struct timespec *__abstime);
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/* Test whether SEM is posted. */
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extern int sem_trywait (sem_t *__sem);
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/* Post SEM. */
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extern int sem_post (sem_t *__sem) ;
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/* Get current value of SEM and store it in *SVAL. */
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extern int sem_getvalue (sem_t *__sem, int *__sval);
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__END_DECLS
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#endif /* semaphore.h */
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