Synchronizing Threads in Python: Managing Concurrent Access to Shared Resources

The threading module provided with Python includes a simple-to-implement locking mechanism that allows you to synchronize threads. A new lock is created by calling the Lock() method, which returns the new lock.

The acquire(blocking) method of the new lock object is used to force the threads to run synchronously. The optional blocking parameter enables you to control whether the thread waits to acquire the lock.

If blocking is set to 0, the thread returns immediately with a 0 value if the lock cannot be acquired and with a 1 if the lock was acquired. If blocking is set to 1, the thread blocks and wait for the lock to be released.

The release() method of the new lock object is used to release the lock when it is no longer required.

Example

import threading import time class myThread (threading.Thread): def __init__(self, threadID, name, counter): threading.Thread.__init__(self) self.threadID = threadID self.name = name self.counter = counter def run(self): print ("Starting " + self.name) # Get lock to synchronize threads threadLock.acquire() print_time(self.name, self.counter, 3) # Free lock to release next thread threadLock.release() def print_time(threadName, delay, counter): while counter: time.sleep(delay) print ("%s: %s" % (threadName, time.ctime(time.time()))) counter -= 1 threadLock = threading.Lock() threads = [] # Create new threads thread1 = myThread(1, "Thread-1", 1) thread2 = myThread(2, "Thread-2", 2) # Start new Threads thread1.start() thread2.start() # Add threads to thread list threads.append(thread1) threads.append(thread2) # Wait for all threads to complete for t in threads: t.join() print ("Exiting Main Thread")

Output

When the above code is executed, it produces the following output −

Starting Thread-1
Starting Thread-2
Thread-1: Thu Jul 13 21:10:11 2023
Thread-1: Thu Jul 13 21:10:12 2023
Thread-1: Thu Jul 13 21:10:13 2023
Thread-2: Thu Jul 13 21:10:15 2023
Thread-2: Thu Jul 13 21:10:17 2023
Thread-2: Thu Jul 13 21:10:19 2023
Exiting Main Thread


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Synchronizing Threads in Python: Managing Concurrent Access to Shared Resources

Example

Output

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Synchronizing Threads in Python: Managing Concurrent Access to Shared Resources

Example

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