/*------------------------------------------------------------------------- * drawElements Thread Library * --------------------------- * * Copyright 2014 The Android Open Source Project * * 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. * *//*! * \file * \brief Win32 implementation of semaphore. *//*--------------------------------------------------------------------*/ #include "deSemaphore.h" #if (DE_OS == DE_OS_WIN32 || DE_OS == DE_OS_WINCE) #define VC_EXTRALEAN #define WIN32_LEAN_AND_MEAN #include <windows.h> #define WIN32_SEM_MAX_VALUE 0x7fffffff DE_STATIC_ASSERT(sizeof(deSemaphore) >= sizeof(HANDLE)); deSemaphore deSemaphore_create (int initialValue, const deSemaphoreAttributes* attributes) { HANDLE handle; DE_UNREF(attributes); handle = CreateSemaphore(DE_NULL, initialValue, WIN32_SEM_MAX_VALUE, DE_NULL); if (!handle) return 0; DE_ASSERT((deSemaphore)handle != 0); return (deSemaphore)handle; } void deSemaphore_destroy (deSemaphore semaphore) { HANDLE handle = (HANDLE)semaphore; CloseHandle(handle); } void deSemaphore_increment (deSemaphore semaphore) { HANDLE handle = (HANDLE)semaphore; BOOL ret = ReleaseSemaphore(handle, 1, DE_NULL); DE_ASSERT(ret); } void deSemaphore_decrement (deSemaphore semaphore) { HANDLE handle = (HANDLE)semaphore; DWORD ret = WaitForSingleObject(handle, INFINITE); DE_ASSERT(ret == WAIT_OBJECT_0); } deBool deSemaphore_tryDecrement (deSemaphore semaphore) { HANDLE handle = (HANDLE)semaphore; DWORD ret = WaitForSingleObject(handle, 0); return (ret == WAIT_OBJECT_0); } #endif /* DE_OS */