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#!/usr/bin/python
import os, errno, time
def try_lock_file(fn):
lp = "%s.%i" % (fn, os.getpid())
fd = os.open(lp, os.O_RDWR|os.O_CREAT, 0666)
try:
os.link(lp, fn)
except OSError, e:
os.close(fd)
os.unlink(lp)
if e.errno != errno.EEXIST:
raise e
return False
os.close(fd)
os.unlink(lp)
return True
def unlock_file(fn):
os.unlink(fn)
if __name__ == "__main__":
if not try_lock_file("test.lock"):
print "FAILED"
else:
try:
print "LOCKED"
time.sleep(60)
finally:
unlock_file("test.lock")
print "UNLOCKED"
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