Samuele E. Locatelli
32 lines
876 B
Python
32 lines
876 B
Python
import fcntl
|
|
import os
|
|
import logging
|
|
|
|
#---------------------------------------------------------------
|
|
# meccanismo di file lock per evitare multiple instances
|
|
# The function will try to lock the file specified , if it success, return True, else return False.
|
|
# The nice thing is that the lock will be dropped when the program terminates.
|
|
# >>>Use :
|
|
# if not lockFile(".lock.pod"):
|
|
# sys.exit(0)
|
|
|
|
def lockFile ( lockfile ) :
|
|
|
|
fd = os.open ( lockfile , os.O_CREAT | os.O_TRUNC | os.O_WRONLY )
|
|
try:
|
|
# Request exclusive (EX) non-blocking (NB) advisory lock.
|
|
fcntl.lockf ( fd , fcntl.LOCK_EX | fcntl.LOCK_NB )
|
|
except IOError:
|
|
return False
|
|
|
|
return True
|
|
|
|
if not lockFile ( ".lockfile" ) :
|
|
print '\n noi non siamo soli ...\n'
|
|
logging.error( "LOCK: Piu istanze aperte")
|
|
#sys.exit ( 0 )
|
|
|
|
#- print '\n running alone ...\n'
|
|
|
|
|