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
deSemaphore_create(int initialValue,const deSemaphoreAttributes * attributes)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
deSemaphore_destroy(deSemaphore semaphore)51 void deSemaphore_destroy(deSemaphore semaphore)
52 {
53 HANDLE handle = (HANDLE)semaphore;
54 CloseHandle(handle);
55 }
56
deSemaphore_increment(deSemaphore semaphore)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 DE_UNREF(ret);
63 }
64
deSemaphore_decrement(deSemaphore semaphore)65 void deSemaphore_decrement(deSemaphore semaphore)
66 {
67 HANDLE handle = (HANDLE)semaphore;
68 DWORD ret = WaitForSingleObject(handle, INFINITE);
69 DE_ASSERT(ret == WAIT_OBJECT_0);
70 DE_UNREF(ret);
71 }
72
deSemaphore_tryDecrement(deSemaphore semaphore)73 bool deSemaphore_tryDecrement(deSemaphore semaphore)
74 {
75 HANDLE handle = (HANDLE)semaphore;
76 DWORD ret = WaitForSingleObject(handle, 0);
77 return (ret == WAIT_OBJECT_0);
78 }
79
80 #endif /* DE_OS */
81