Unlock the Power of lock-defer: A Comprehensive Guide to Mastering APIs

The lock-defer library is a powerful tool for developers, offering a range of APIs to simplify complex tasks. Whether you are looking to synch tasks or manage resources efficiently, lock-defer has an API for you. Let’s dive into the introduction and key APIs with practical code snippets.

Introduction to lock-defer

lock-defer provides utilities to manage locks on shared resources, allowing for deferred execution of tasks. It ensures that resources are not accessed simultaneously, thus avoiding potential issues like race conditions.

API Examples

1. Basic Lock Usage

Acquire and release a lock to ensure that a critical section of code is executed by only one thread at a time.

  import lockDefer

  lock = lockDefer.Lock()

  def critical_section():
      with lock:
          # perform some thread-safe operation
          pass

2. Deferred Execution

Execute some code after a lock is released.

  def deferred():
      print("This runs after the lock is released!")

  lock = lockDefer.Lock()

  def critical_section():
      with lock:
          # perform some thread-safe operation
          lock.defer(deferred)

3. Timeouts

Acquire a lock with a specified timeout. If the lock cannot be acquired within the timeout period, it raises an exception.

  import lockDefer
  import time

  lock = lockDefer.Lock()

  def critical_section():
      try:
          with lock.acquire(timeout=2.0):
              # perform some thread-safe operation within 2 seconds
              time.sleep(1.5)
      except lockDefer.AsyncTimeoutError:
          print("Could not acquire lock within the timeout period.")

4. Stacked Locks

Manage multiple locks more efficiently using the StackedLocks feature.

  locks = [lockDefer.Lock(), lockDefer.Lock()]

  def critical_section():
      with lockDefer.StackedLocks(*locks):
          # perform some operation under multiple locks
          pass

5. Context Manager Support

Use lock-defer with Python’s context managers for more readable code.

  lock = lockDefer.Lock()

  @lock.context_manager
  def critical_section():
      # perform some thread-safe operation
      pass

  critical_section()

App Example

Here’s a simple example of an app that uses the lock-defer library to manage a shared resource.

  import lockDefer
  import threading

  resource = 0

  lock = lockDefer.Lock()

  def increment_resource():
      global resource
      with lock:
          temp = resource
          temp += 1
          resource = temp
          print(f"Resource incremented to {resource}")

  threads = [threading.Thread(target=increment_resource) for _ in range(5)]

  for thread in threads:
      thread.start()

  for thread in threads:
      thread.join()

In this example, multiple threads increment a shared resource while ensuring safe access through the use of a lock.

We hope these examples help you harness the full potential of the lock-defer library in your projects!

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