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/*
* Copyright (C) 2014 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef PerThread_h
#define PerThread_h
#include "BPlatform.h"
#include "Inline.h"
#include <mutex>
#include <pthread.h>
#if defined(__has_include)
#if __has_include(<System/pthread_machdep.h>)
#include <System/pthread_machdep.h>
#define HAVE_PTHREAD_MACHDEP_H 1
#else
#define HAVE_PTHREAD_MACHDEP_H 0
#endif
#else
#define HAVE_PTHREAD_MACHDEP_H 0
#endif
namespace bmalloc {
// Usage:
// Object* object = PerThread<Object>::get();
template<typename T>
class PerThread {
public:
static T* get();
static T* getFastCase();
static T* getSlowCase();
private:
static void destructor(void*);
};
#if HAVE_PTHREAD_MACHDEP_H
class Cache;
template<typename T> struct PerThreadStorage;
// For now, we only support PerThread<Cache>. We can expand to other types by
// using more keys.
template<> struct PerThreadStorage<Cache> {
static const pthread_key_t key = __PTK_FRAMEWORK_JAVASCRIPTCORE_KEY0;
static void* get()
{
return _pthread_getspecific_direct(key);
}
static void init(void* object, void (*destructor)(void*))
{
_pthread_setspecific_direct(key, object);
pthread_key_init_np(key, destructor);
}
};
#else
template<typename T> struct PerThreadStorage {
static bool s_didInitialize;
static pthread_key_t s_key;
static std::once_flag s_onceFlag;
static void* get()
{
if (!s_didInitialize)
return nullptr;
return pthread_getspecific(s_key);
}
static void init(void* object, void (*destructor)(void*))
{
std::call_once(s_onceFlag, [destructor]() {
pthread_key_create(&s_key, destructor);
s_didInitialize = true;
});
pthread_setspecific(s_key, object);
}
};
template<typename T> bool PerThreadStorage<T>::s_didInitialize;
template<typename T> pthread_key_t PerThreadStorage<T>::s_key;
template<typename T> std::once_flag PerThreadStorage<T>::s_onceFlag;
#endif
template<typename T>
INLINE T* PerThread<T>::getFastCase()
{
return static_cast<T*>(PerThreadStorage<T>::get());
}
template<typename T>
inline T* PerThread<T>::get()
{
T* t = getFastCase();
if (!t)
return getSlowCase();
return t;
}
template<typename T>
void PerThread<T>::destructor(void* p)
{
T* t = static_cast<T*>(p);
delete t;
}
template<typename T>
T* PerThread<T>::getSlowCase()
{
BASSERT(!getFastCase());
T* t = new T;
PerThreadStorage<T>::init(t, destructor);
return t;
}
} // namespace bmalloc
#endif // PerThread_h
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