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/*
* mutex.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*/
#include "pthread.h"
#include "implement.h"
int
pthread_mutex_init(pthread_mutex_t *mutex, pthread_mutex_attr_t *attr)
{
if (mutex == NULL)
{
return EINVAL;
}
/* Create a critical section. */
InitializeCriticalSection(mutex);
return 0;
}
int
pthread_mutex_destroy(pthread_mutex_t *mutex)
{
if (mutex == NULL)
{
return EINVAL;
}
DeleteCriticalSection(mutex);
return 0;
}
int
pthread_mutexattr_init(pthread_mutexattr_t *attr)
{
if (attr == NULL)
{
/* This is disallowed. */
return EINVAL;
}
/* None of the optional attributes are supported yet. */
return 0;
}
int
pthread_mutexattr_destroy(pthread_mutexattr_t *attr)
{
/* Nothing to do. */
return 0;
}
int
pthread_mutexattr_setpshared(pthread_mutexattr_t *attr, int process_shared)
{
/* This function is not supported. */
return ENOSYS;
}
int
pthread_mutexattr_getpshared(const pthread_mutexattr_t *attr,
int *process_shared)
{
/* This function is not supported. */
return ENOSYS;
}
int
pthread_mutex_lock(pthread_mutex_t *mutex)
{
EnterCriticalSection(mutex);
return 0;
}
int
pthread_mutex_unlock(pthread_mutex_t *mutex)
{
LeaveCriticalSection(mutex);
return 0;
}
int
pthread_mutex_trylock(pthread_mutex_t *mutex)
{
/* Typically evaluates to 31. */
int numbits = (sizeof(DWORD) * 8) - 1;
if ((GetVersion() >> numbits) != 1)
{
/* We're not on Windows NT; return ENOSYS. */
return ENOSYS;
}
if (mutex == NULL)
{
return EINVAL;
}
return (TryEnterCriticalSection(mutex) != TRUE) ? EBUSY : 0;
}
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