1 /*-------------------------------------------------------------------------
2 * drawElements Thread Library
3 * ---------------------------
5 * Copyright 2014 The Android Open Source Project
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
11 * http://www.apache.org/licenses/LICENSE-2.0
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.
21 * \brief Win32 implementation of semaphore.
22 *//*--------------------------------------------------------------------*/
24 #include "deSemaphore.h"
26 #if (DE_OS == DE_OS_WIN32 || DE_OS == DE_OS_WINCE)
29 #define WIN32_LEAN_AND_MEAN
32 #define WIN32_SEM_MAX_VALUE 0x7fffffff
34 DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(HANDLE));
36 deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes)
42 handle = CreateSemaphore(DE_NULL, initialValue, WIN32_SEM_MAX_VALUE, DE_NULL);
46 DE_ASSERT((deSemaphore)handle != 0);
48 return (deSemaphore)handle;
51 void deSemaphore_destroy (deSemaphore semaphore)
53 HANDLE handle = (HANDLE)semaphore;
57 void deSemaphore_increment (deSemaphore semaphore)
59 HANDLE handle = (HANDLE)semaphore;
60 BOOL ret = ReleaseSemaphore(handle, 1, DE_NULL);
65 void deSemaphore_decrement (deSemaphore semaphore)
67 HANDLE handle = (HANDLE)semaphore;
68 DWORD ret = WaitForSingleObject(handle, INFINITE);
69 DE_ASSERT(ret == WAIT_OBJECT_0);
73 deBool deSemaphore_tryDecrement (deSemaphore semaphore)
75 HANDLE handle = (HANDLE)semaphore;
76 DWORD ret = WaitForSingleObject(handle, 0);
77 return (ret == WAIT_OBJECT_0);