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Proper use of QThread.currentThreadId ()

I thought the identifier definition for QThreadis currently performed by a function QThread.currentThreadId(). However, I believe that this does not give the expected results (in PyQt5 with python 3, but I have no reason to believe that this will be different from pyqt4 / py 2, therefore, common tags). The thread identifier changes in such a way that I cannot explain, which indicates that I cannot use it, where the QThread instance identifier changes predictably, indicating that I should use this to identify the current thread. To check, I created this:

from PyQt5 import QtCore, QtWidgets
from PyQt5.QtCore import pyqtSignal
import time
import sys

def logthread(caller):
    print('%-25s: %s, %s' % (caller, QtCore.QThread.currentThread(), QtCore.QThread.currentThreadId()))


class Worker(QtCore.QObject):
    done = pyqtSignal()

    def __init__(self, parent=None):
        logthread('worker.__init__')
        super().__init__(parent)

    def run(self, m=10):
        logthread('worker.run')
        for x in range(m):
            y = x + 2
            time.sleep(0.001) 
        logthread('worker.run finished')

        self.done.emit()


class MainWindow(QtWidgets.QWidget):
    def __init__(self, parent=None):
        logthread('mainwin.__init__')
        super().__init__(parent)

        self.worker = Worker()
        self.workerThread = None

        self.btn = QtWidgets.QPushButton('Start worker in thread')
        self.btn2 = QtWidgets.QPushButton('Run worker here')
        layout = QtWidgets.QVBoxLayout(self)
        layout.addWidget(self.btn)
        layout.addWidget(self.btn2)

        self.run()

    def run(self):
        logthread('mainwin.run')

        self.workerThread = QtCore.QThread()
        self.worker.moveToThread(self.workerThread)
        self.worker.done.connect(self.workerDone)
        self.btn.clicked.connect(self.worker.run)
        self.btn2.clicked.connect(self.runWorkerHere)

        self.workerThread.start()
        self.show()

    def workerDone(self):
        logthread('mainwin.workerDone')

    def runWorkerHere(self):
        logthread('mainwin.runWorkerHere')
        self.worker.run()


if __name__ == '__main__':
    app = QtWidgets.QApplication([])
    logthread('main')

    window = MainWindow()
    sys.exit(app.exec_())

, , QThread.currentThread() Python , QThread.currentThreadId() :

main                     : <PyQt5.QtCore.QThread object at 0x01ABDD00>, <sip.voidptr object at 0x01A4ABC0>
mainwin.__init__         : <PyQt5.QtCore.QThread object at 0x01ABDD50>, <sip.voidptr object at 0x01A4ABC0>
worker.__init__          : <PyQt5.QtCore.QThread object at 0x01ABDDA0>, <sip.voidptr object at 0x01A4ABC0>
mainwin.run              : <PyQt5.QtCore.QThread object at 0x01ABDE90>, <sip.voidptr object at 0x01A4ABC0>

, QThread Python , , , QThread ++.

" ": worker.run , , . :

mainwin.runWorkerHere    : <PyQt5.QtCore.QThread object at 0x01ABDEE0>, <sip.voidptr object at 0x01A4ABC0>
worker.run               : <PyQt5.QtCore.QThread object at 0x01ABDEE0>, <sip.voidptr object at 0x01A4ABC0>
worker.run finished      : <PyQt5.QtCore.QThread object at 0x01ABDEE0>, <sip.voidptr object at 0x01A4ACC8>
mainwin.workerDone       : <PyQt5.QtCore.QThread object at 0x01ABDEE0>, <sip.voidptr object at 0x01A4ABC0>

, QThread , . , , worker.run, ! , , QThread .

" ". worker.run, . 3 :

worker.run               : <PyQt5.QtCore.QThread object at 0x01ABDE90>, <sip.voidptr object at 0x01A4ABC0>
worker.run finished      : <PyQt5.QtCore.QThread object at 0x01ABDE90>, <sip.voidptr object at 0x01A4ACC8>
mainwin.workerDone       : <PyQt5.QtCore.QThread object at 0x01ABDEE0>, <sip.voidptr object at 0x01A4ACC8>

QThread worker.run ( ), , . , (sip.voidptr) , : , 2 0x01A4ABC0, , 3- ().

, logthread QtWidgets.QApplication.instance().thread(), , QThread QThread, , _run` . ( , ).

, , QThread , QApplication , (currentThreadId()) . , , , QThread.currentThread() , , app.thread(), currentThreadId(). - - , ? , , currentThreadId()? , ?

+4
1

, sip.voidptr . int(QThread.currentThreadId()), . , , , threadId, , , . .

, Python ​​ (. ).

, , , self.worker QThread, , " ". , .

, , PyQt4 Python 2.7!

from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import pyqtSignal
import time
import sys
import threading

def logthread(caller):
    print('%-25s: %s, %s,' % (caller, QtCore.QThread.currentThread(), int(QtCore.QThread.currentThreadId())))
    print('%-25s: %s, %s,' % (caller, threading.current_thread().name, threading.current_thread().ident))


class Worker(QtCore.QObject):
    done = pyqtSignal()

    def __init__(self, parent=None):
        logthread('worker.__init__')
        super(Worker, self).__init__(parent)

    def run(self, m=10):
        logthread('worker.run')
        for x in range(m):
            y = x + 2
            time.sleep(0.001) 
        logthread('worker.run finished')

        self.done.emit()


class MainWindow(QtGui.QWidget):
    def __init__(self, parent=None):
        logthread('mainwin.__init__')
        super(MainWindow, self).__init__(parent)

        self.worker = Worker()
        self.workerThread = None

        self.btn = QtGui.QPushButton('Start worker in thread')
        self.btn2 = QtGui.QPushButton('Run worker here')
        layout = QtGui.QVBoxLayout(self)
        layout.addWidget(self.btn)
        layout.addWidget(self.btn2)

        self.run()

    def run(self):
        logthread('mainwin.run')

        self.workerThread = QtCore.QThread()
        self.worker.moveToThread(self.workerThread)
        self.worker.done.connect(self.workerDone)
        self.btn.clicked.connect(self.worker.run)
        self.btn2.clicked.connect(self.runWorkerHere)

        self.workerThread.start()
        self.show()

    def workerDone(self):
        logthread('mainwin.workerDone')

    def runWorkerHere(self):
        logthread('mainwin.runWorkerHere')
        worker = Worker()
        worker.done.connect(self.workerDone)
        worker.run()
        # self.worker.run()


if __name__ == '__main__':
    app = QtGui.QApplication([])
    logthread('main')

    window = MainWindow()
    sys.exit(app.exec_())
+5

Source: https://habr.com/ru/post/1539143/

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