QWaitCondition 2. qwaitcondition

QWaitCondition 2. qwaitcondition

 

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• Q: Which threads does the QWaitCondition wake () and wakeall () functions wake up?

Can the suspended threads caused by various objects in this class be awakened globally?

A: No. I wrote an example to prove that:

QWaitCondition only wakes up by A thread blocked by A specific QWaitCondition object (for example, A). It can be awakened through A. wakeOne (), or A. wakeAll.

If necessary, leave a message and upload the example.

 

• I personally think there are two ways to synchronize threads

Active mode, such as mutex and semaphores. Features: The blocked thread can actively detect whether it can run and does not need to be awakened

Passive mode, such as QWaitCondition. Features: The thread is blocked, and the blocked thread is activated through wake/wakeall to continue running as conditions permit.