7.5 threading -- Higher-level threading interface

This module constructs higher-level threading interfaces on top of the lower level thread module.

This module is safe for use with "from threading import *". It defines the following functions and objects:

networkCount()
Return the number of currently active Thread objects. The returned count is equal to the length of the list returned by enumerate(). A function that returns the number of currently active threads.

Condition()
A factory function that returns a new condition variable object. A condition variable allows one or more threads to wait until they are notified by another thread.

currentThread()
Return the current Thread object, corresponding to the caller's thread of control. If the caller's thread of control was not created through the threading module, a dummy thread object with limited functionality is returned.

enumerate()
Return a list of all currently active Thread objects. The list includes daemonic threads, dummy thread objects created by currentThread(), and the main thread. It excludes terminated threads and threads that have not yet been started.

Event()
A factory function that returns a new event object. An event manages a flag that can be set to true with the set() method and reset to false with the clear() method. The wait() method blocks until the flag is true.

Lock()
A factory function that returns a new primitive lock object. Once a thread has acquired it, subsequent attempts to acquire it block, until it is released; any thread may release it.

RLock()
A factory function that returns a new reentrant lock object. A reentrant lock must be released by the thread that acquired it. Once a thread has acquired a reentrant lock, the same thread may acquire it again without blocking; the thread must release it once for each time it has acquired it.

Semaphore()
A factory function that returns a new semaphore object. A semaphore manages a counter representing the number of release() calls minus the number of acquire() calls, plus an initial value. The acquire() method blocks if necessary until it can return without making the counter negative.

class Thread
A class that represents a thread of control. This class can be safely subclassed in a limited fashion.

Detailed interfaces for the objects are documented below.

The design of this module is loosely based on Java's threading model. However, where Java makes locks and condition variables basic behavior of every object, they are separate objects in Python. Python's Thread class supports a subset of the behavior of Java's Thread class; currently, there are no priorities, no thread groups, and threads cannot be destroyed, stopped, suspended, resumed, or interrupted. The static methods of Java's Thread class, when implemented, are mapped to module-level functions.

All of the methods described below are executed atomically.


Subsections
See About this document... for information on suggesting changes.


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