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 DE_UNREF(ret); 63 } 64 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 73 deBool 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
