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