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20 Threads and Concurrency
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threading
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The threading module provides a Thread class and a variety of synchronization primitives for writing multithreaded programs
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Thread Objects
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The Thread class is used to represent a separate thread of control A new thread can be created as follows:
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Thread(group=None, target=None, name=None, args=(), kwargs={})
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This creates a new Thread instance group is None and is reserved for future extensions target is a callable object invoked by the run() method when the thread starts By default, it s None, meaning that nothing is called name is the thread name By default, a unique name of the form "Thread-N" is created args is a tuple of arguments passed to the target function kwargs is a dictionary of keyword arguments passed to target A Thread instance t supports the following methods and attributes:
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tstart()
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Starts the thread by invoking the run() method in a separate thread of controlThis method can be invoked only once
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trun()
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This method is called when the thread starts By default, it calls the target function passed in the constructorThis method can also be redefined in subclasses of Thread
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tjoin([timeout])
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Waits until the thread terminates or a timeout occurs timeout is a floating-point number specifying a timeout in seconds A thread cannot join itself, and it s an error to join a thread before it has been started
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Returns True if the thread is alive and False otherwise A thread is alive from the moment the start() method returns until its run() method terminates tisAlive() is an alias for this method in older code
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tname
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The thread nameThis is a string that is used for identification only and which can be changed to a more meaningful value if desired (which may simplify debugging) In older code, tgetName() and tsetName(name) are used to manipulate the thread name
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An integer thread identifier If the thread has not yet started, the value is None
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tdaemon
The thread s Boolean daemonic flagThis must be set prior to calling start() and the initial value is inherited from daemonic status of the creating threadThe entire Python program exits when no active non-daemon threads are left All programs have a main
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thread that represents the initial thread of control and which is not daemonic In older code, tsetDaemon(flag) and tisDaemon() are used to manipulate this value Here is an example that shows how to create and launch a function (or other callable) as a thread:
import threading import time def clock(interval): while True: print("The time is %s" % timectime()) timesleep(interval) t = threadingThread(target=clock, args=(15,)) tdaemon = True tstart()
Here is an example that shows how to define the same thread as a class:
import threading import time class ClockThread(threadingThread): def _ _init_ _(self,interval): threadingThread_ _init_ _(self) selfdaemon = True selfinterval = interval def run(self): while True: print("The time is %s" % timectime()) timesleep(selfinterval) t = ClockProcess(15) tstart()
If you define a thread as a class and define your own _ _init_ _() method, it is critically important to call the base class constructor Thread_ _init_ _() as shown If you forget this, you will get a nasty error Other than run(), it is an error to override any of the other methods already defined for a thread The setting of the daemon attribute in these examples is a common feature of threads that will run forever in the background Normally, Python waits for all threads to terminate before the interpreter exits However, for nonterminating background tasks, this behavior is often undesirable Setting the daemon flag makes the interpreter quit immediately after the main program exits In this case, the daemonic threads are simply destroyed
Timer Objects
A Timer object is used to execute a function at some later time
Timer(interval, func [, args [, kwargs]])
Creates a timer object that runs the function func after interval seconds have elapsed args and kwargs provide the arguments and keyword arguments passed to funcThe timer does not start until the start() method is called