| // Copyright 2015 The Shaderc Authors. All rights reserved. |
| // |
| // 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. |
| |
| #ifndef LIBSHADERC_UTIL_INC_MUTEX_H |
| #define LIBSHADERC_UTIL_INC_MUTEX_H |
| |
| // shaderc_util::mutex will be defined and specialized |
| // depending on the platform that is being compiled. |
| // It is more or less conformant to the C++11 specification of std::mutex. |
| // However it does not implement try_lock. |
| |
| #ifdef _WIN32 |
| // windows.h #defines min and max if we don't define this. |
| // this means things like std::min and std::max break |
| #ifndef NOMINMAX |
| #define NOMINMAX |
| #endif |
| |
| #include <windows.h> |
| namespace shaderc_util { |
| |
| // As the name suggests, this mutex class is for running on windows. |
| // It conforms to the c++11 mutex implementation, and should be a |
| // drop in replacement. |
| class windows_mutex { |
| public: |
| using native_handle_type = HANDLE; |
| |
| windows_mutex() { mutex_ = CreateMutex(nullptr, false, nullptr); } |
| |
| ~windows_mutex() { |
| if (mutex_ != INVALID_HANDLE_VALUE) { |
| CloseHandle(mutex_); |
| } |
| } |
| |
| windows_mutex(const windows_mutex&) = delete; |
| windows_mutex& operator=(const windows_mutex&) = delete; |
| |
| // Locks this mutex, waiting until the mutex is unlocked if it is not already. |
| // It is not valid to lock a mutex that has already been locked. |
| void lock() { WaitForSingleObject(mutex_, INFINITE); } |
| |
| // Unlocks this mutex. It is invalid to unlock a mutex that this thread |
| // has not already locked. |
| void unlock() { ReleaseMutex(mutex_); } |
| |
| // Returns the native handle for this mutex. In this case a HANDLE object. |
| native_handle_type native_handle() { return mutex_; } |
| |
| private: |
| HANDLE mutex_; |
| }; |
| |
| using mutex = windows_mutex; |
| } |
| |
| #else |
| #include <pthread.h> |
| #include <memory> |
| namespace shaderc_util { |
| |
| // As the name suggests, this mutex class is for running with pthreads. |
| // It conforms to the c++11 mutex implementation, and should be a |
| // drop in replacement. |
| class posix_mutex { |
| public: |
| using native_handle_type = pthread_mutex_t*; |
| |
| posix_mutex() { pthread_mutex_init(&mutex_, nullptr); } |
| |
| ~posix_mutex() { pthread_mutex_destroy(&mutex_); } |
| |
| posix_mutex(const posix_mutex&) = delete; |
| posix_mutex& operator=(const posix_mutex&) = delete; |
| |
| // Locks this mutex, waiting until the mutex is unlocked if it is not already. |
| // It is not valid to lock a mutex that has already been locked. |
| void lock() { pthread_mutex_lock(&mutex_); } |
| |
| // Unlocks this mutex. It is invalid to unlock a mutex that this thread |
| // has not already locked. |
| void unlock() { pthread_mutex_unlock(&mutex_); } |
| |
| // Returns the native handle for this mutex. In this case a pthread_mutex_t*. |
| native_handle_type native_handle() { return &mutex_; } |
| |
| private: |
| pthread_mutex_t mutex_; |
| }; |
| |
| using mutex = posix_mutex; |
| } |
| #endif |
| |
| #endif // LIBSHADERC_UTIL_INC_MUTEX_H |