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semaphore.h    53 lines (42 with data), 1.3 kB

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/*
* -------------------------------------------------------------
*
* Module: semaphore.h
*
* Purpose:
* Semaphores aren't actually part of the PThreads standard.
* They are defined by the POSIX Standard:
*
* POSIX 1003.1b-1993 (POSIX.1b)
*
* They are supposed to follow the older UNIX convention for
* reporting errors. That is, on failure they are supposed
* to return a value of -1 and store the appropriate error
* number into 'errno'.
* HOWEVER,errno cannot be modified in a multithreaded
* program on WIN32; therefore, the value is returned as
* the function value.
* It is recommended that you compare for zero (0) for success
* instead of -1 for failure when checking the status of
* these functions.
*
* -------------------------------------------------------------
*/
#if !defined( SEMAPHORE_H )
#define SEMAPHORE_H
#include <process.h>
#include <errno.h>
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
typedef HANDLE sem_t;
int sem_init (sem_t * sem, int pshared, unsigned int value);
int sem_destroy (sem_t * sem);
int sem_trywait (sem_t * sem);
int sem_wait (sem_t * sem);
int sem_post (sem_t * sem);
#ifdef __cplusplus
} /* End of extern "C" */
#endif /* __cplusplus */
#endif /* !SEMAPHORE_H */