| /*------------------------------------------------------------------------- |
| * 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 mutex. |
| *//*--------------------------------------------------------------------*/ |
| |
| #include "deMutex.h" |
| |
| #if (DE_OS == DE_OS_WIN32 || DE_OS == DE_OS_WINCE) |
| |
| #include "deMemory.h" |
| |
| #define VC_EXTRALEAN |
| #define WIN32_LEAN_AND_MEAN |
| #define NOMINMAX |
| #include <windows.h> |
| |
| /* Critical section objects are more lightweight than mutexes on Win32. */ |
| #define USE_CRITICAL_SECTION 1 |
| |
| #if defined(USE_CRITICAL_SECTION) |
| |
| enum |
| { |
| CRITICAL_SECTION_SPIN_COUNT = 2048 |
| }; |
| |
| DE_STATIC_ASSERT(sizeof(deMutex) >= sizeof(CRITICAL_SECTION*)); |
| |
| deMutex deMutex_create (const deMutexAttributes* attributes) |
| { |
| CRITICAL_SECTION* criticalSection = (CRITICAL_SECTION*)deMalloc(sizeof(CRITICAL_SECTION)); |
| if (!criticalSection) |
| return 0; |
| |
| DE_UNREF(attributes); |
| /* \note [2012-11-05 pyry] Critical sections are always recursive. */ |
| |
| if (!InitializeCriticalSectionAndSpinCount(criticalSection, CRITICAL_SECTION_SPIN_COUNT)) |
| { |
| deFree(criticalSection); |
| return 0; |
| } |
| |
| return (deMutex)criticalSection; |
| } |
| |
| void deMutex_destroy (deMutex mutex) |
| { |
| DeleteCriticalSection((CRITICAL_SECTION*)mutex); |
| deFree((CRITICAL_SECTION*)mutex); |
| } |
| |
| void deMutex_lock (deMutex mutex) |
| { |
| EnterCriticalSection((CRITICAL_SECTION*)mutex); |
| } |
| |
| void deMutex_unlock (deMutex mutex) |
| { |
| LeaveCriticalSection((CRITICAL_SECTION*)mutex); |
| } |
| |
| deBool deMutex_tryLock (deMutex mutex) |
| { |
| return TryEnterCriticalSection((CRITICAL_SECTION*)mutex) == TRUE; |
| } |
| |
| #else |
| |
| DE_STATIC_ASSERT(sizeof(deMutex) >= sizeof(HANDLE)); |
| |
| deMutex deMutex_create (const deMutexAttributes* attributes) |
| { |
| HANDLE handle = DE_NULL; |
| |
| DE_UNREF(attributes); |
| /* \note [2009-11-12 pyry] Created mutex is always recursive. */ |
| |
| handle = CreateMutex(DE_NULL, FALSE, DE_NULL); |
| return (deMutex)handle; |
| } |
| |
| void deMutex_destroy (deMutex mutex) |
| { |
| HANDLE handle = (HANDLE)mutex; |
| CloseHandle(handle); |
| } |
| |
| void deMutex_lock (deMutex mutex) |
| { |
| HANDLE handle = (HANDLE)mutex; |
| DWORD ret = WaitForSingleObject(handle, INFINITE); |
| DE_ASSERT(ret == WAIT_OBJECT_0); |
| } |
| |
| void deMutex_unlock (deMutex mutex) |
| { |
| HANDLE handle = (HANDLE)mutex; |
| BOOL ret = ReleaseMutex(handle); |
| DE_ASSERT(ret == TRUE); |
| } |
| |
| deBool deMutex_tryLock (deMutex mutex) |
| { |
| HANDLE handle = (HANDLE)mutex; |
| DWORD ret = WaitForSingleObject(handle, 0); |
| return (ret == WAIT_OBJECT_0); |
| } |
| |
| #endif /* USE_CRITICAL_SECTION */ |
| |
| #endif /* DE_OS */ |