threadPool.waitForDone()什么意思?
时间: 2024-02-04 12:02:08 浏览: 159
threadPool.waitForDone()是一个线程池的方法,它的作用是等待所有线程任务执行完成后再继续执行主程序。
具体来说,当我们创建一个线程池并向其中提交了多个任务时,这些任务会在不同的线程中并发执行。而在某些情况下,我们需要等待这些任务全部完成后再继续执行主程序,比如要求这些任务的结果必须全部返回后才能进行下一步操作。
这时就可以使用threadPool.waitForDone()方法,它会阻塞当前线程,直到线程池中的所有任务都执行完成。这样,我们就可以保证所有任务都已经完成并返回了结果,再进行下一步操作。
相关问题
class Worker(QObject): mySignal = pyqtSignal() def init(self): super().init() def run(self): self.mySignal.emit() class MyRunnable(QRunnable): def init(self, func,*param): super().init() self.func = func self.param = param def run(self): self.func(self.param[0][0],self.param[0][1]) class test(QWidget): def init(self): super().init() self.name = 'name' self.setWindowTitle('测试') self.initUI() def initUI(self): self.label = QLabel(self) thread = QThread() worker = Worker() worker.moveToThread(thread) worker1 = Worker() worker1.moveToThread(thread) worker2 = Worker() worker2.moveToThread(thread) threadPool = QThreadPool() task1 = MyRunnable(self.func1, (1, 2)) task2 = MyRunnable(self.func2, (2, 2)) task3 = MyRunnable(self.func3, (3, 2)) #thread.started.connect(task1) worker.mySignal.connect(task1.run) worker1.mySignal.connect(task2.run) worker2.mySignal.connect(task3.run) threadPool.start(worker) threadPool.start(worker1) threadPool.start(worker2) threadPool.waitForDone() def func1(self,x,y): print(x+y) def func4(): self.label.setText(str(x+y)) func4() time.sleep(1) def func2(self, x,y): print(x + y) self.label.setText(str(x + y)) time.sleep(1) def func3(self, x,y): print(x + y) self.label.setText(str(x + y)) time.sleep(1) app = QApplication(sys.argv) main = test() main.show() sys.exit(app.exec_())报警:TypeError: arguments did not match any overloaded call: start(self, QRunnable, priority: int = 0): argument 1 has unexpected type 'Worker' start(self, Callable[[], None], priority: int = 0): argument 1 has unexpected type 'Worker'怎么解决?
在这段代码中,你使用了错误的类型将 `worker`、`worker1` 和 `worker2` 对象传递给 `threadPool.start()` 方法。正确的类型应该是 `MyRunnable` 对象,因为 `QThreadPool` 的 `start()` 方法需要一个 `QRunnable` 对象作为参数。
为了解决这个问题,你需要将三个 `Worker` 对象分别替换为对应的 `MyRunnable` 对象。修改代码如下:
```
task1 = MyRunnable(self.func1, (1, 2))
task2 = MyRunnable(self.func2, (2, 2))
task3 = MyRunnable(self.func3, (3, 2))
threadPool.start(task1)
threadPool.start(task2)
threadPool.start(task3)
```
这样就可以将 `MyRunnable` 对象传递给 `QThreadPool` 的 `start()` 方法了。
class Worker(QObject): mySignal = pyqtSignal() def __init__(self): super().__init__() def run(self): self.mySignal.emit() class MyRunnable(QRunnable): def __init__(self, func,*param): super().__init__() self.func = func self.param = param def run(self): self.func(self.param[0][0],self.param[0][1]) class test(QWidget): def __init__(self): super().__init__() self.name = 'name' self.setWindowTitle('测试') self.initUI() def initUI(self): self.label = QLabel(self) thread = QThread() worker = Worker() worker.moveToThread(thread) worker1 = Worker() worker1.moveToThread(thread) worker2 = Worker() worker2.moveToThread(thread) threadPool = QThreadPool() task1 = MyRunnable(self.func1, (1, 2)) task2 = MyRunnable(self.func2, (2, 2)) task3 = MyRunnable(self.func3, (3, 2)) #thread.started.connect(task1) worker.mySignal.connect(task1) worker1.mySignal.connect(task2) worker2.mySignal.connect(task3) threadPool.start(worker) threadPool.start(worker1) threadPool.start(worker2) threadPool.waitForDone() def func1(self,x,y): print(x+y) def func4(): self.label.setText(str(x+y)) func4() time.sleep(1) def func2(self, x,y): print(x + y) self.label.setText(str(x + y)) time.sleep(1) def func3(self, x,y): print(x + y) self.label.setText(str(x + y)) time.sleep(1) app = QApplication(sys.argv) main = test() main.show() sys.exit(app.exec_())报警:worker.mySignal.connect(task1) TypeError: argument 1 has unexpected type 'MyRunnable'怎么解决?
在这段代码中,`worker.mySignal` 是一个信号,它发出的信号将会触发 `task1` 的运行。但是你在连接信号和槽时,使用了错误的语法。正确的语法是将信号连接到槽,而你却在将信号连接到了 `MyRunnable` 对象。为了解决这个问题,你需要将 `worker.mySignal` 连接到 `task1.run` 方法。修改代码如下:
```
worker.mySignal.connect(task1.run)
worker1.mySignal.connect(task2.run)
worker2.mySignal.connect(task3.run)
```
这样就可以将信号和槽正确地连接起来了。
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