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This approach leverages JavaScript's built-in setTimeout and clearTimeout functions. We schedule a timeout to execute the function fn after t milliseconds, and we return a cancelFn that, when called, cancels this scheduled timeout.
In C, without a standard set of functions for asynchronous timeouts, it's less about algorithmic complexity and more about the overhead of managing threads, which varies based on the implementation details.
C does not have direct support for asynchronous delay management similar to setTimeout in JavaScript, particularly in standard libraries. Such functionality generally requires external libraries or platform-specific code for thread and timer management.
This alternative approach involves using Promises to manage asynchronous execution and potential cancelation. By wrapping the setTimeout within a Promise, we can have more control over its execution and cancelation by managing the Promise lifecycle.
Time Complexity and space complexity would depend on the specific threading mechanism and the use of synchronization primitives.
1import asyncio
2
3async def cancellable(fn, args, t):
4 task = asyncio.ensure_future(asyncio.sleep(t / 1000))
5
6 async def cancel_task():
7 if not task.done():
8 task.cancel()
9 print("Cancelled")
10
11 try:
12 await task
13 fn(*args)
14 except asyncio.CancelledError:
15 pass
16 return cancel_task
17
18async def main():
19 async def myFunction(x):
20 print(x * 5)
21
22 cancel_fn = await cancellable(myFunction, [2], 20)
23
24 # Simulate cancel call
25 await asyncio.sleep(0.01) # Less than 20ms, hence should cancel the execution
26 await cancel_fn()
27
28asyncio.run(main())Python's asyncio library is employed to establish async tasks similar to Promises. We define an asynchronous cancellable function to handle the timeout and a separate task for cancelation, leveraging the async/await syntax.