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/* Plain mutexes (native Windows implementation).
Copyright (C) 2005-2020 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <https://www.gnu.org/licenses/>. */
/* Written by Bruno Haible <bruno@clisp.org>, 2005.
Based on GCC's gthr-win32.h. */
#include <config.h>
/* Specification. */
#include "windows-mutex.h"
#include <errno.h>
void
glwthread_mutex_init (glwthread_mutex_t *mutex)
{
InitializeCriticalSection (&mutex->lock);
mutex->guard.done = 1;
}
int
glwthread_mutex_lock (glwthread_mutex_t *mutex)
{
if (!mutex->guard.done)
{
if (InterlockedIncrement (&mutex->guard.started) == 0)
/* This thread is the first one to need this mutex. Initialize it. */
glwthread_mutex_init (mutex);
else
{
/* Don't let mutex->guard.started grow and wrap around. */
InterlockedDecrement (&mutex->guard.started);
/* Yield the CPU while waiting for another thread to finish
initializing this mutex. */
while (!mutex->guard.done)
Sleep (0);
}
}
EnterCriticalSection (&mutex->lock);
return 0;
}
int
glwthread_mutex_trylock (glwthread_mutex_t *mutex)
{
if (!mutex->guard.done)
{
if (InterlockedIncrement (&mutex->guard.started) == 0)
/* This thread is the first one to need this mutex. Initialize it. */
glwthread_mutex_init (mutex);
else
{
/* Don't let mutex->guard.started grow and wrap around. */
InterlockedDecrement (&mutex->guard.started);
/* Let another thread finish initializing this mutex, and let it also
lock this mutex. */
return EBUSY;
}
}
if (!TryEnterCriticalSection (&mutex->lock))
return EBUSY;
return 0;
}
int
glwthread_mutex_unlock (glwthread_mutex_t *mutex)
{
if (!mutex->guard.done)
return EINVAL;
LeaveCriticalSection (&mutex->lock);
return 0;
}
int
glwthread_mutex_destroy (glwthread_mutex_t *mutex)
{
if (!mutex->guard.done)
return EINVAL;
DeleteCriticalSection (&mutex->lock);
mutex->guard.done = 0;
return 0;
}
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