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本文鏈接：https://blog.csdn.net/wsj18808050/article/details/51603006
在GUN標准中，提供了__thread關鍵字，配合static后，可以實現讓一個線程擁有自己的全局變量。
我對__thread進行了簡單的封裝，可以用於存儲class。並且防止了內存泄露（如果使用Qt線程類）。
測試中，我一共開啟了兩個線程，從輸出可以得知每個線程都擁有自己的變量，並且在線程退出后被正常釋放。
測試代碼：
// Qt lib import
#include <QtCore>
#include <QtConcurrent>
class MyClass
{
public:
MyClass()
{
qDebug() << "MyClass" << this << QThread::currentThread();
}
~MyClass()
{
qDebug() << "~MyClass" << this << QThread::currentThread();
}
};
template< class T >
class ThreadStore
{
public:
T &getQuote()
{
if ( !t )
{
t = new T;
auto thread = qobject_cast< QThread * >( QThread::currentThread() );
if ( thread && thread->isRunning() )
{
QObject::connect( QThread::currentThread(), &QThread::finished, [ this ]()
{
if ( t )
{
delete t;
t = nullptr;
}
} );
}
}
return *t;
}
private:
T *t;
};
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
auto myTest = []()
{
static __thread ThreadStore< MyClass > threadStore;
auto &myData = threadStore.getQuote();
qDebug() << "myData:" << &myData;
QThread::sleep( 1 );
};
QThreadPool::globalInstance()->setMaxThreadCount( 2 );
QtConcurrent::run( myTest );
QtConcurrent::run( myTest );
QtConcurrent::run( myTest );
QtConcurrent::run( myTest );
QThreadPool::globalInstance()->waitForDone();
return a.exec();
}
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輸出結果：
MyClass 0x7fe842e09b10 QThread(0x7fe842d0cbe0, name = "Thread (pooled)")
MyClass 0x7fe842c1d6a0 QThread(0x7fe842d0df60, name = "Thread (pooled)")
myData: 0x7fe842e09b10
myData: 0x7fe842c1d6a0
myData: 0x7fe842e09b10
myData: 0x7fe842c1d6a0
~MyClass 0x7fe842e09b10 QThread(0x7fe842d0cbe0, name = "Thread (pooled)")
~MyClass 0x7fe842c1d6a0 QThread(0x7fe842d0df60, name = "Thread (pooled)")
————————————————
版權聲明：本文為CSDN博主「Jason188080501」的原創文章，遵循 CC 4.0 BY-SA 版權協議，轉載請附上原文出處鏈接及本聲明。
原文鏈接：https://blog.csdn.net/wsj18808050/article/details/51603006