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Move many Thread related classes

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Vinnie Falco
2013-10-04 13:49:24 -07:00
parent 93e9d8622e
commit 6c7f5d093c
48 changed files with 1043 additions and 2158 deletions
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197
beast/threads/ThreadLocalValue.h Normal file
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//------------------------------------------------------------------------------
/*
This file is part of Beast: https://github.com/vinniefalco/Beast
Copyright 2013, Vinnie Falco <vinnie.falco@gmail.com>
Portions of this file are from JUCE.
Copyright (c) 2013 - Raw Material Software Ltd.
Please visit http://www.juce.com
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#ifndef BEAST_THREADS_THREADLOCALVALUE_H_INCLUDED
#define BEAST_THREADS_THREADLOCALVALUE_H_INCLUDED
#include "../Config.h"
#include "SpinLock.h"
#include "Thread.h"
namespace beast {
// (NB: on win32, native thread-locals aren't possible in a dynamically loaded DLL in XP).
#if ! ((BEAST_MSVC && (BEAST_64BIT || ! defined (BeastPlugin_PluginCode))) \
|| (BEAST_MAC && BEAST_CLANG && defined (MAC_OS_X_VERSION_10_7) \
&& MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_7))
#define BEAST_NO_COMPILER_THREAD_LOCAL 1
#endif
//==============================================================================
/**
Provides cross-platform support for thread-local objects.
This class holds an internal list of objects of the templated type, keeping
an instance for each thread that requests one. The first time a thread attempts
to access its value, an object is created and added to the list for that thread.
Typically, you'll probably want to create a static instance of a ThreadLocalValue
object, or hold one within a singleton.
The templated class for your value could be a primitive type, or any class that
has a default constructor and copy operator.
When a thread no longer needs to use its value, it can call releaseCurrentThreadStorage()
to allow the storage to be re-used by another thread. If a thread exits without calling
this method, the object storage will be left allocated until the ThreadLocalValue object
is deleted.
*/
template <typename Type>
class ThreadLocalValue : public Uncopyable
{
public:
/** */
ThreadLocalValue() noexcept
{
}
/** Destructor.
When this object is deleted, all the value objects for all threads will be deleted.
*/
~ThreadLocalValue()
{
#if BEAST_NO_COMPILER_THREAD_LOCAL
for (ObjectHolder* o = first.value; o != nullptr;)
{
ObjectHolder* const next = o->next;
delete o;
o = next;
}
#endif
}
/** Returns a reference to this thread's instance of the value.
Note that the first time a thread tries to access the value, an instance of the
value object will be created - so if your value's class has a non-trivial
constructor, be aware that this method could invoke it.
*/
Type& operator*() const noexcept { return get(); }
/** Returns a pointer to this thread's instance of the value.
Note that the first time a thread tries to access the value, an instance of the
value object will be created - so if your value's class has a non-trivial
constructor, be aware that this method could invoke it.
*/
operator Type*() const noexcept { return &get(); }
/** Accesses a method or field of the value object.
Note that the first time a thread tries to access the value, an instance of the
value object will be created - so if your value's class has a non-trivial
constructor, be aware that this method could invoke it.
*/
Type* operator->() const noexcept { return &get(); }
/** Assigns a new value to the thread-local object. */
ThreadLocalValue& operator= (const Type& newValue) { get() = newValue; return *this; }
/** Returns a reference to this thread's instance of the value.
Note that the first time a thread tries to access the value, an instance of the
value object will be created - so if your value's class has a non-trivial
constructor, be aware that this method could invoke it.
*/
Type& get() const noexcept
{
#if BEAST_NO_COMPILER_THREAD_LOCAL
const Thread::ThreadID threadId = Thread::getCurrentThreadId();
for (ObjectHolder* o = first.get(); o != nullptr; o = o->next)
if (o->threadId == threadId)
return o->object;
for (ObjectHolder* o = first.get(); o != nullptr; o = o->next)
{
if (o->threadId == nullptr)
{
{
SpinLock::ScopedLockType sl (lock);
if (o->threadId != nullptr)
continue;
o->threadId = threadId;
}
o->object = Type();
return o->object;
}
}
ObjectHolder* const newObject = new ObjectHolder (threadId);
do
{
newObject->next = first.get();
}
while (! first.compareAndSetBool (newObject, newObject->next));
return newObject->object;
#elif BEAST_MAC
static __thread Type object;
return object;
#elif BEAST_MSVC
static __declspec(thread) Type object;
return object;
#endif
}
/** Called by a thread before it terminates, to allow this class to release
any storage associated with the thread.
*/
void releaseCurrentThreadStorage()
{
#if BEAST_NO_COMPILER_THREAD_LOCAL
const Thread::ThreadID threadId = Thread::getCurrentThreadId();
for (ObjectHolder* o = first.get(); o != nullptr; o = o->next)
{
if (o->threadId == threadId)
{
SpinLock::ScopedLockType sl (lock);
o->threadId = nullptr;
}
}
#endif
}
private:
//==============================================================================
#if BEAST_NO_COMPILER_THREAD_LOCAL
struct ObjectHolder : public Uncopyable
{
ObjectHolder (const Thread::ThreadID& tid)
: threadId (tid), object()
{}
Thread::ThreadID threadId;
ObjectHolder* next;
Type object;
};
mutable Atomic<ObjectHolder*> first;
SpinLock lock;
#endif
};
}
#endif