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      1 /*-------------------------------------------------------------------------
      2  * drawElements Thread Library
      3  * ---------------------------
      4  *
      5  * Copyright 2014 The Android Open Source Project
      6  *
      7  * Licensed under the Apache License, Version 2.0 (the "License");
      8  * you may not use this file except in compliance with the License.
      9  * You may obtain a copy of the License at
     10  *
     11  *      http://www.apache.org/licenses/LICENSE-2.0
     12  *
     13  * Unless required by applicable law or agreed to in writing, software
     14  * distributed under the License is distributed on an "AS IS" BASIS,
     15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     16  * See the License for the specific language governing permissions and
     17  * limitations under the License.
     18  *
     19  *//*!
     20  * \file
     21  * \brief Win32 implementation of semaphore.
     22  *//*--------------------------------------------------------------------*/
     23 
     24 #include "deSemaphore.h"
     25 
     26 #if (DE_OS == DE_OS_WIN32 || DE_OS == DE_OS_WINCE)
     27 
     28 #define VC_EXTRALEAN
     29 #define WIN32_LEAN_AND_MEAN
     30 #include <windows.h>
     31 
     32 #define WIN32_SEM_MAX_VALUE 0x7fffffff
     33 
     34 DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(HANDLE));
     35 
     36 deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes)
     37 {
     38 	HANDLE	handle;
     39 
     40 	DE_UNREF(attributes);
     41 
     42 	handle = CreateSemaphore(DE_NULL, initialValue, WIN32_SEM_MAX_VALUE, DE_NULL);
     43 	if (!handle)
     44 		return 0;
     45 
     46 	DE_ASSERT((deSemaphore)handle != 0);
     47 
     48 	return (deSemaphore)handle;
     49 }
     50 
     51 void deSemaphore_destroy (deSemaphore semaphore)
     52 {
     53 	HANDLE	handle	= (HANDLE)semaphore;
     54 	CloseHandle(handle);
     55 }
     56 
     57 void deSemaphore_increment (deSemaphore semaphore)
     58 {
     59 	HANDLE	handle	= (HANDLE)semaphore;
     60 	BOOL	ret		= ReleaseSemaphore(handle, 1, DE_NULL);
     61 	DE_ASSERT(ret);
     62 }
     63 
     64 void deSemaphore_decrement (deSemaphore semaphore)
     65 {
     66 	HANDLE	handle	= (HANDLE)semaphore;
     67 	DWORD	ret		= WaitForSingleObject(handle, INFINITE);
     68 	DE_ASSERT(ret == WAIT_OBJECT_0);
     69 }
     70 
     71 deBool deSemaphore_tryDecrement (deSemaphore semaphore)
     72 {
     73 	HANDLE	handle	= (HANDLE)semaphore;
     74 	DWORD	ret		= WaitForSingleObject(handle, 0);
     75 	return (ret == WAIT_OBJECT_0);
     76 }
     77 
     78 #endif /* DE_OS */
     79