QThread & QMutex

[VeNToR]

How do you know that the thread has already mutexed ? QThread::isRunning is not answer...

[SGaist]

Hi,

You can use tryLock for example.

Out of curiosity, what is your use case ?

[VeNToR]

@SGaist said in QThread & QMutex:

Out of curiosity, what is your use case ?

Hi;

tryLock always returns true.

	// RSM is own object (Remote Service Manager.  It likes OO-RPC (and likes Qt Remote Object).
	CChRSM
	{
		id	: chRSM
	}

	CChRSMNetworkAccessManager
	{
		id			: chTestx

		chRSM		: chRSM
	}

	Loader
	{
		id		: chLoaderPage
			
		source	: "rsmfile:///Content/ChPageTest.ui.qml"

		// if true, everthing ok !!!
		//asynchronous: true

		onLoaded:
		{
			item.chRSM = chRSM;
		}
	}

QNetworkAccessManager* CChQMLRSMNetworkAccessManagerFactory::create(
	QObject*	ChParent)
{
	// dead lock occurs here, cause'f m_ChQMLRSM is in main thread and locked !
	m_ChQMLRSM->ChGetSessionInfo();
....
}

[Buckwheat]

@VeNToR said in QThread & QMutex:

ck always returns true.

Hi @VeNToR!

By chance is your mutex created using QMutex::Recursive and are you using tryLock in the same thread?

from QMutex documentation:
"Calling this function multiple times on the same mutex from the same thread is allowed if this mutex is a recursive mutex. If this mutex is a non-recursive mutex, this function will always return false when attempting to lock the mutex recursively."