What is the difference between asynchrony and…

Asynchronous and multithreading are approaches to executing parallel tasks.

Multithreading involves creating and executing multiple threads within a single process. Threads run in parallel (on multi-core systems) or pseudo-parallel (on single-core systems through context switching). Suitable for CPU-intensive tasks.

import threading
import time

def task(name):
    # Simulate work
    time.sleep(1)
    print(f"Thread {name} finished")

threads = []
for i in range(3):
    thread = threading.Thread(target=task, args=(i,))
    threads.append(thread)
    thread.start() # Start thread

for thread in threads:
    thread.join() # Wait for thread to finish

print("All threads finished")

Asynchronous (async) is based on using a single thread (or a small number of threads) with an event-driven architecture. Instead of waiting for a blocking operation (like I/O) to complete, the task "yields" control, allowing other tasks to run, and then "resumes" when the operation is complete. Suitable for I/O-bound tasks.

import asyncio
import time

async def async_task(name):
    # Simulate asynchronous blocking operation (e.g., network request)
    await asyncio.sleep(1)
    print(f"Asynchronous task {name} finished")

async def main():
    tasks = []
    for i in range(3):
        task = asyncio.create_task(async_task(i))
        tasks.append(task)

    await asyncio.gather(*tasks) # Wait for all async tasks to complete

if __name__ == "__main__":
    asyncio.run(main())
    print("All asynchronous tasks finished")

Main differences:

Aspect	Multithreading	Asyncio
Execution	Multiple threads, in parallel or pseudo-parallel	Usually one thread with task switching
Model	Based on OS threads, preemptive multitasking	Based on event loop, cooperative multitasking
Complexity	Thread management, locks, GIL (in Python)	Coroutine management, await/async
Usage	CPU-bound tasks	I/O-bound tasks
GIL (Python)	Limits real parallelism for CPU-bound code	Not an issue for I/O-bound tasks

What is the difference between asynchrony and multithreading?