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/*
* Copyright 2011-2013 Blender Foundation
*
* 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 __UTIL_THREAD_H__
#define __UTIL_THREAD_H__
#include <condition_variable>
#include <functional>
#include <mutex>
#include <queue>
#include <thread>
#ifdef _WIN32
# include "util_windows.h"
#else
# include <pthread.h>
#endif
#ifdef __APPLE__
# include <libkern/OSAtomic.h>
#endif
#include "util/util_function.h"
CCL_NAMESPACE_BEGIN
typedef std::mutex thread_mutex;
typedef std::unique_lock<std::mutex> thread_scoped_lock;
typedef std::condition_variable thread_condition_variable;
/* Own thread implementation similar to std::thread, so we can set a
* custom stack size on macOS. */
class thread {
public:
/* NOTE: Node index of -1 means that affinity will be inherited from the
* parent thread and no override on top of that will happen. */
thread(function<void()> run_cb, int node = -1);
~thread();
static void *run(void *arg);
bool join();
protected:
function<void()> run_cb_;
#ifdef __APPLE__
pthread_t pthread_id;
#else
std::thread std_thread;
#endif
bool joined_;
int node_;
};
/* Own wrapper around pthread's spin lock to make it's use easier. */
class thread_spin_lock {
public:
#ifdef __APPLE__
inline thread_spin_lock()
{
spin_ = OS_SPINLOCK_INIT;
}
inline void lock()
{
OSSpinLockLock(&spin_);
}
inline void unlock()
{
OSSpinLockUnlock(&spin_);
}
#elif defined(_WIN32)
inline thread_spin_lock()
{
const DWORD SPIN_COUNT = 50000;
InitializeCriticalSectionAndSpinCount(&cs_, SPIN_COUNT);
}
inline ~thread_spin_lock()
{
DeleteCriticalSection(&cs_);
}
inline void lock()
{
EnterCriticalSection(&cs_);
}
inline void unlock()
{
LeaveCriticalSection(&cs_);
}
#else
inline thread_spin_lock()
{
pthread_spin_init(&spin_, 0);
}
inline ~thread_spin_lock()
{
pthread_spin_destroy(&spin_);
}
inline void lock()
{
pthread_spin_lock(&spin_);
}
inline void unlock()
{
pthread_spin_unlock(&spin_);
}
#endif
protected:
#ifdef __APPLE__
OSSpinLock spin_;
#elif defined(_WIN32)
CRITICAL_SECTION cs_;
#else
pthread_spinlock_t spin_;
#endif
};
class thread_scoped_spin_lock {
public:
explicit thread_scoped_spin_lock(thread_spin_lock &lock) : lock_(lock)
{
lock_.lock();
}
~thread_scoped_spin_lock()
{
lock_.unlock();
}
/* TODO(sergey): Implement manual control over lock/unlock. */
protected:
thread_spin_lock &lock_;
};
CCL_NAMESPACE_END
#endif /* __UTIL_THREAD_H__ */
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