mutex — mutex module

The mutex module provides a mutual-exclusion primitive for protecting critical sections of code or shared data from concurrent access by an interrupt service routine and the main thread.

Lock acquisition and release is performed via a context manager (with statement), which blocks until the mutex is available. A non-blocking Mutex.test() method is also provided.

class Mutex – mutex object

class mutex.Mutex

Creates an unlocked mutex object.

release() → None

Unlock the mutex. Raises mutex.MutexException if the mutex is not currently locked.

test() → bool

Try to acquire the mutex in a non-blocking way. Returns True on success and False if the mutex is already locked.

To acquire the mutex in a blocking way, use the instance as a context manager (with statement). The mutex is released automatically on exit.

Exceptions

exception mutex.MutexException

Subclass of OSError. Raised by Mutex.release when the mutex is already unlocked.