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65 lines
1.2 KiB
65 lines
1.2 KiB
2 months ago
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/*
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* The UCW Library -- POSIX semaphores wrapper
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*
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* (c) 2006 Robert Spalek <robert@ucw.cz>
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*
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* This software may be freely distributed and used according to the terms
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* of the GNU Lesser General Public License.
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*/
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#ifndef _UCW_SEMAPHORE_H
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#define _UCW_SEMAPHORE_H
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#include <semaphore.h>
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#ifdef CONFIG_DARWIN
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#include <unistd.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ucw/fastbuf.h> // For the temp_file_name
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/* In Darwin, sem_init() is unfortunately not implemented and the guide
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* recommends emulating it using sem_open(). */
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static inline sem_t *sem_alloc(void)
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{
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char buf[TEMP_FILE_NAME_LEN];
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int mode, retry = 10;
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sem_t *sem;
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do
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{
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temp_file_name(buf, &mode);
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sem = sem_open(buf, mode | O_CREAT, 0777, 0);
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}
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while (sem == (sem_t*) SEM_FAILED && errno == EEXIST && retry --);
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ASSERT(sem != (sem_t*) SEM_FAILED);
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return sem;
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}
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static inline void sem_free(sem_t *sem)
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{
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sem_close(sem);
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}
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#else
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static inline sem_t *sem_alloc(void)
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{
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sem_t *sem = xmalloc(sizeof(sem_t));
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int res = sem_init(sem, 0, 0);
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ASSERT(!res);
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return sem;
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}
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static inline void sem_free(sem_t *sem)
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{
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sem_destroy(sem);
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xfree(sem);
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}
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#endif
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#endif
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