import threading
import sys

def tracer(frame, event, arg):
    if event == 'call':
        print(f"Entering: {frame.f_code.co_name}")
        return tracer
    elif event == 'c_call':
        print(f"C --- Entering: {arg.__name__}")
    elif event == 'return':
        print(f"Returning: {arg!r}")
    elif event == 'c_return':
        print(f"C --- Returning from: {arg.__name__}")


lock = threading.Lock()

sys.setprofile(tracer)
threading.setprofile(tracer)

print("Begin...")

# In the following case, we would see the C functions being called: acquire and release
lock.acquire()
print("Do some routine with explicit locking")
lock.release()

print("In the middle...")

# In the following case, we cannot see that any locking is happening, despite it working
with lock:
    print("Do some routine with locking using context management")

print("End...")