144 lines
2.9 KiB
C++
144 lines
2.9 KiB
C++
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __UTIL_THREAD_H__
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#define __UTIL_THREAD_H__
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#include <thread>
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#include <mutex>
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#include <condition_variable>
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#include <functional>
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#include <queue>
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#ifdef _WIN32
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# include "util_windows.h"
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#else
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# include <pthread.h>
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#endif
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#ifdef __APPLE__
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# include <libkern/OSAtomic.h>
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#endif
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#include "util/util_function.h"
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CCL_NAMESPACE_BEGIN
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typedef std::mutex thread_mutex;
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typedef std::unique_lock<std::mutex> thread_scoped_lock;
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typedef std::condition_variable thread_condition_variable;
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/* own pthread based implementation, to avoid boost version conflicts with
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* dynamically loaded blender plugins */
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class thread {
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public:
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/* NOTE: Node index of -1 means that affinity will be inherited from the
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* parent thread and no override on top of that will happen. */
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thread(function<void()> run_cb, int node = -1);
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~thread();
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static void *run(void *arg);
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bool join();
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protected:
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function<void()> run_cb_;
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std::thread thread_;
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bool joined_;
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int node_;
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};
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/* Own wrapper around pthread's spin lock to make it's use easier. */
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class thread_spin_lock {
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public:
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#ifdef __APPLE__
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inline thread_spin_lock() {
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spin_ = OS_SPINLOCK_INIT;
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}
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inline void lock() {
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OSSpinLockLock(&spin_);
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}
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inline void unlock() {
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OSSpinLockUnlock(&spin_);
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}
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#elif defined(_WIN32)
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inline thread_spin_lock() {
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const DWORD SPIN_COUNT = 50000;
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InitializeCriticalSectionAndSpinCount(&cs_, SPIN_COUNT);
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}
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inline ~thread_spin_lock() {
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DeleteCriticalSection(&cs_);
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}
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inline void lock() {
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EnterCriticalSection(&cs_);
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}
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inline void unlock() {
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LeaveCriticalSection(&cs_);
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}
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#else
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inline thread_spin_lock() {
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pthread_spin_init(&spin_, 0);
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}
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inline ~thread_spin_lock() {
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pthread_spin_destroy(&spin_);
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}
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inline void lock() {
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pthread_spin_lock(&spin_);
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}
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inline void unlock() {
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pthread_spin_unlock(&spin_);
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}
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#endif
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protected:
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#ifdef __APPLE__
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OSSpinLock spin_;
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#elif defined(_WIN32)
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CRITICAL_SECTION cs_;
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#else
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pthread_spinlock_t spin_;
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#endif
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};
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class thread_scoped_spin_lock {
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public:
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explicit thread_scoped_spin_lock(thread_spin_lock& lock)
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: lock_(lock) {
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lock_.lock();
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}
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~thread_scoped_spin_lock() {
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lock_.unlock();
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}
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/* TODO(sergey): Implement manual control over lock/unlock. */
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protected:
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thread_spin_lock& lock_;
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};
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CCL_NAMESPACE_END
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#endif /* __UTIL_THREAD_H__ */
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