FreeRDP/winpr/libwinpr/synch/mutex.c

/**
 * WinPR: Windows Portable Runtime
 * Synchronization Functions
 *
 * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.com>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include <winpr/synch.h>

#include "synch.h"

#ifndef _WIN32

#include "../handle/handle.h"
static BOOL MutexCloseHandle(HANDLE handle);

static BOOL MutexIsHandled(HANDLE handle)
{
	WINPR_TIMER* pMutex = (WINPR_TIMER*) handle;

	if (!pMutex || pMutex->Type != HANDLE_TYPE_MUTEX)
	{
		SetLastError(ERROR_INVALID_HANDLE);
		return FALSE;
	}

	return TRUE;
}

static int MutexGetFd(HANDLE handle)
{
	WINPR_MUTEX *mux = (WINPR_MUTEX *)handle;
	if (!MutexIsHandled(handle))
		return -1;

	/* TODO: Mutex does not support file handles... */
	(void)mux;
	return -1;
}

BOOL MutexCloseHandle(HANDLE handle) {
	WINPR_MUTEX *mutex = (WINPR_MUTEX *) handle;

	if (!MutexIsHandled(handle))
		return FALSE;

	if(pthread_mutex_destroy(&mutex->mutex))
		return FALSE;

	free(handle);

	return TRUE;
}

static HANDLE_OPS ops = {
		MutexIsHandled,
		MutexCloseHandle,
		MutexGetFd,
		NULL /* CleanupHandle */
};

HANDLE CreateMutexW(LPSECURITY_ATTRIBUTES lpMutexAttributes, BOOL bInitialOwner, LPCWSTR lpName)
{
	HANDLE handle = NULL;
	WINPR_MUTEX* mutex;

	mutex = (WINPR_MUTEX*) calloc(1, sizeof(WINPR_MUTEX));

	if (mutex)
	{
		pthread_mutex_init(&mutex->mutex, 0);

		WINPR_HANDLE_SET_TYPE(mutex, HANDLE_TYPE_MUTEX);
		mutex->ops = &ops;

		handle = (HANDLE) mutex;

		if (bInitialOwner)
			pthread_mutex_lock(&mutex->mutex);
	}

	return handle;
}

HANDLE CreateMutexA(LPSECURITY_ATTRIBUTES lpMutexAttributes, BOOL bInitialOwner, LPCSTR lpName)
{
	return CreateMutexW(lpMutexAttributes, bInitialOwner, NULL);
}

HANDLE CreateMutexExA(LPSECURITY_ATTRIBUTES lpMutexAttributes, LPCTSTR lpName, DWORD dwFlags, DWORD dwDesiredAccess)
{
	return CreateMutexW(lpMutexAttributes, FALSE, NULL);
}

HANDLE CreateMutexExW(LPSECURITY_ATTRIBUTES lpMutexAttributes, LPCWSTR lpName, DWORD dwFlags, DWORD dwDesiredAccess)
{
	return CreateMutexW(lpMutexAttributes, FALSE, NULL);
}

HANDLE OpenMutexA(DWORD dwDesiredAccess, BOOL bInheritHandle,LPCSTR lpName)
{
	return NULL;
}

HANDLE OpenMutexW(DWORD dwDesiredAccess, BOOL bInheritHandle,LPCWSTR lpName)
{
	return NULL;
}

BOOL ReleaseMutex(HANDLE hMutex)
{
	ULONG Type;
	PVOID Object;
	WINPR_MUTEX* mutex;

	if (!winpr_Handle_GetInfo(hMutex, &Type, &Object))
		return FALSE;

	if (Type == HANDLE_TYPE_MUTEX)
	{
		mutex = (WINPR_MUTEX*) Object;
		pthread_mutex_unlock(&mutex->mutex);
		return TRUE;
	}

	return FALSE;
}

#endif