pld-builder.new/PLD_Builder/lock.py

   1 # vi: encoding=utf-8 ts=8 sts=4 sw=4 et
   2
   3 import fcntl
   4
   5 import path
   6
   7 locks_list = []
   8
   9 def lock(n, non_block = 0):
  10     f = open(path.lock_dir + '/' + n, "a")
  11     # blah, otherwise it gets garbage collected and doesn't work
  12     locks_list.append(f)
  13     if non_block:
  14         try:
  15             fcntl.flock(f, fcntl.LOCK_EX | fcntl.LOCK_NB)
  16         except:
  17             f.close()
  18             return None
  19     else:
  20         fcntl.flock(f, fcntl.LOCK_EX)
  21     return f