Lock Guard Coordination Report

Try a nonblocking lock several times and report whether the guard stayed open or blocked a later attempt.

lock_guard_coordination_report.py

import threading


holds = 
guard = threading.Lock()
acquired = 0
blocked = 0

for _ in range(holds):
    if guard.acquire(blocking=False):
        acquired += 1
    else:
        blocked += 1

status = "open" if acquired == 0 else "blocked" if blocked > 0 else "guarded"

if acquired > 0:
    guard.release()

print("holds=" + str(holds) + " acquired=" + str(acquired) + " blocked=" + str(blocked) + " status=" + status)

import threading


holds = 
guard = threading.Lock()
acquired = 0
blocked = 0

for _ in range(holds):
    if guard.acquire(blocking=False):
        acquired += 1
    else:
        blocked += 1

status = "open" if acquired == 0 else "blocked" if blocked > 0 else "guarded"

if acquired > 0:
    guard.release()

print("holds=" + str(holds) + " acquired=" + str(acquired) + " blocked=" + str(blocked) + " status=" + status)

import threading


holds = 
guard = threading.Lock()
acquired = 0
blocked = 0

for _ in range(holds):
    if guard.acquire(blocking=False):
        acquired += 1
    else:
        blocked += 1

status = "open" if acquired == 0 else "blocked" if blocked > 0 else "guarded"

if acquired > 0:
    guard.release()

print("holds=" + str(holds) + " acquired=" + str(acquired) + " blocked=" + str(blocked) + " status=" + status)

nonblocking lock A `threading.Lock` acquired without blocking reports whether the guard was free, so a second attempt that fails shows the lock is already held.