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The kind of signaling shown in this example is often instead carried out using condition variables, which will be described shortly
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Events
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Events are used to communicate between threads One thread signals an event, and one or more other threads wait for it An Event instance manages an internal 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
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Creates a new Event instance with the internal flag set to false An Event instance, e, supports the following methods:
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Sets the internal flag to true All threads waiting for it to become true are awakened
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Resets the internal flag to false
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Blocks until the internal flag is true If the internal flag is true on entry, this method returns immediately Otherwise, it blocks until another thread calls set() to set the flag to true or until the optional timeout occurs timeout is a floating-point number specifying a timeout period in seconds Although Event objects can be used to signal other threads, they should not be used to implement the kind of notification that is typical in producer/consumer problems For example, you should avoid code like this:
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evt = Event() def producer(): while True: # produce item evtsignal() def consumer(): while True: # Wait for an item evtwait() # Consume the item # Clear the event and wait again evtclear()
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This code does not work reliably because the producer might produce a new item in between the evtwait() and evtclear() operations However, by clearing the event, this new item won t be seen by the consumer until the producer creates a new item In the best case, the program will experience a minor hiccup where the processing
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of an item is inexplicably delayed In the worst case, the whole program will hang due to the loss of an event signal For these types of problems, you are better off using condition variables
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Condition Variables
A condition variable is a synchronization primitive, built on top of another lock that s used when a thread is interested in a particular change of state or event occurring A typical use is a producer-consumer problem where one thread is producing data to be consumed by another thread A new Condition instance is created using the following constructor:
Condition([lock])
Creates a new condition variable lock is an optional Lock or RLock instance If not supplied, a new RLock instance is created for use with the condition variable A condition variable, cv, supports the following methods:
cvacquire(*args)
Acquires the underlying lockThis method calls the corresponding acquire(*args) method on the underlying lock and returns the result
cvrelease()
Releases the underlying lockThis method calls the corresponding release() method on the underlying lock
cvwait([timeout])
Waits until notified or until a timeout occursThis method is called after the calling thread has already acquired the lockWhen called, the underlying lock is released, and the thread goes to sleep until it s awakened by a notify() or notifyAll() call performed on the condition variable by another thread Once awakened, the thread reacquires the lock and the method returns timeout is a floating-point number in seconds If this time expires, the thread is awakened, the lock reacquired, and control returned
cvnotify([n])
Wakes up one or more threads waiting on this condition variableThis method is called only after the calling thread has acquired the lock, and it does nothing if no threads are waiting n specifies the number of threads to awaken and defaults to 1 Awakened threads don t return from the wait() call until they can reacquire the lock
cvnotify_all()
Wakes up all threads waiting on this conditionThis method is called notifyAll() in older code Here is an example that provides a template of using condition variables:
cv = threadingCondition() def producer(): while True: cvacquire() produce_item() cvnotify() cvrelease()