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20 Threads and Concurrency
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A Timer object, t, has the following methods:
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tstart()
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Starts the timerThe function func supplied to Timer() will be executed after the specified timer interval
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tcancel()
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Cancels the timer if the function has not executed yet
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Lock Objects
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A primitive lock (or mutual exclusion lock) is a synchronization primitive that s in either a locked or unlocked stateTwo methods, acquire() and release(), are used to change the state of the lock If the state is locked, attempts to acquire the lock are blocked until the lock is released If more than one thread is waiting to acquire the lock, only one is allowed to proceed when the lock is releasedThe order in which waiting threads proceed is undefined A new Lock instance is created using the following constructor:
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Lock()
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Creates a new Lock object that s initially unlocked A Lock instance, lock, supports the following methods:
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lockacquire([blocking ])
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Acquires the lock, blocking until the lock is released if necessary If blocking is supplied and set to False, the function returns immediately with a value of False if the lock could not be acquired or True if locking was successful
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lockrelease()
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Releases a lock It s an error to call this method when the lock is in an unlocked state or from a different thread than the one that originally called acquire()
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RLock
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A reentrant lock is a synchronization primitive that s similar to a Lock object, but it can be acquired multiple times by the same threadThis allows the thread owning the lock to perform nested acquire() and release() operations In this case, only the outermost release() operation resets the lock to its unlocked state A new RLock object is created using the following constructor:
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RLock()
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Creates a new reentrant lock object An RLock object, rlock, supports the following methods:
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rlockacquire([blocking ])
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Acquires the lock, blocking until the lock is released if necessary If no thread owns the lock, it s locked and the recursion level is set to 1 If this thread already owns the lock, the recursion level of the lock is increased by one and the function returns immediately
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rlockrelease()
Releases a lock by decrementing its recursion level If the recursion level is zero after the decrement, the lock is reset to the unlocked state Otherwise, the lock remains lockedThis function should only be called by the thread that currently owns the lock
Semaphore and Bounded Semaphore
A semaphore is a synchronization primitive based on a counter that s decremented by each acquire() call and incremented by each release() call If the counter ever reaches zero, the acquire() method blocks until some other thread calls release()
Semaphore([value])
Creates a new semaphore value is the initial value for the counter If omitted, the counter is set to a value of 1 A Semaphore instance, s, supports the following methods:
sacquire([blocking])
Acquires the semaphore If the internal counter is larger than zero on entry, this method decrements it by 1 and returns immediately If it s zero, this method blocks until another thread calls release()The blocking argument has the same behavior as described for Lock and RLock objects
srelease()
Releases a semaphore by incrementing the internal counter by 1 If the counter is zero and another thread is waiting, that thread is awakened If multiple threads are waiting, only one will be returned from its acquire() callThe order in which threads are released is not deterministic
BoundedSemaphore([value])
Creates a new semaphore value is the initial value for the counter If value is omitted, the counter is set to a value of 1 A BoundedSemaphore works exactly like a Semaphore except the number of release() operations cannot exceed the number of acquire() operations A subtle difference between a semaphore and a mutex lock is that a semaphore can be used for signaling For example, the acquire() and release() methods can be called from different threads to communicate between producer and consumer threads
produced = threadingSemaphore(0) consumed = threadingSemaphore(1) def producer(): while True: consumedacquire() produce_item() producedrelease() def consumer(): while True: producedacquire() item = get_item() consumedrelease()