qmutex

How to correctly lock Qthreads in pyqt5 using Python3

由 …衆ロ難τιáo~ 提交于 2021-02-10 06:29:09
问题 I am relatively new to python, but was able to get a reasonably useful program to run to crunch a lot of data. I am able to run it over multiple sets of data sequentially using another python script to call the program serially, but I wanted to create a GUI and use multithreading to allow others to use it without knowing all the ins and outs of programming. I created the GUI successfully, and can feed data bidirectionally using signals and slots. What I am having trouble with is creating

Does QMutex need to be static so other threads calls of this class instance know to suspend their operations?

由 ▼魔方 西西 提交于 2019-12-05 01:39:28
问题 From multiple threads the following append function is called. I don't want data to re-write an append because the counter had not yet been incremented. Will this suspend all threads coming in except for the one currently using Append? Or will the other threads just continue running and not append the data? Does the mutex need to be "STATIC" or will each instance know to suspend operations? If I don't want hiccups, I assume I have to build a buffer to back log data? void classA::Append(int

Does QMutex need to be static so other threads calls of this class instance know to suspend their operations?

由 你离开我真会死。 提交于 2019-12-03 17:23:26
From multiple threads the following append function is called. I don't want data to re-write an append because the counter had not yet been incremented. Will this suspend all threads coming in except for the one currently using Append? Or will the other threads just continue running and not append the data? Does the mutex need to be "STATIC" or will each instance know to suspend operations? If I don't want hiccups, I assume I have to build a buffer to back log data? void classA::Append(int _msg) { static int c = 0; QMutex mutex; //need to be static so other threads know to suspend? //there are

Qt: Best practice for a single instance app protection

由 ╄→尐↘猪︶ㄣ 提交于 2019-11-26 06:19:40
问题 QSingleApplication ? QMutex ? QSharedMemory ? I\'m looking for something that will work smoothly in Windows, OSX and Linux (Ubuntu). Using Qt 4.7.1 回答1: Simple solution, that does what you want. Without network dependency (as QtSingleApplication ) and without any overhead. Usage: int main() { RunGuard guard( "some_random_key" ); if ( !guard.tryToRun() ) return 0; QAppplication a(/*...*/); // ... } RunGuard.h #ifndef RUNGUARD_H #define RUNGUARD_H #include <QObject> #include <QSharedMemory>
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