pidlockfile.py for windows

기존에 있던 lockfile.pidlockfile 모듈을 참조하여 pid 부분을 수정

import os import errno from win32com.client import GetObject class PIDLockError(Exception):     pass class AlreadyLocked(PIDLockError):     def __init__(self, path):         self.path = path              def __str__(self):         return "%s is already locked" % self.path class LockFailed(PIDLockError):     def __init__(self, path):         self.path = path     def __str__(self):         return "failed to create %s" % self.path class PIDLockFile(object):     def __init__(self, path):         self.path = path     def read_pid(self):         return self.read_pid_from_pidfile()     def is_locked(self):         return os.path.exists(self.path)     def i_am_locking(self):         running_process = []         wmi = GetObject('winmgmts:')         processes = wmi.InstancesOf('win32_Process')         for pro in processes:             running_process.append(pro.Properties_('ProcessId').value)                      if self.is_locked():             if self.read_pid() in running_process:                 return True         return False     def acquire(self):         if not self.i_am_locking():             self.break_lock()                      try:             self.write_pid_to_pidfile()         except OSError, exc:             if exc.errno == errno.EEXIST:                 raise AlreadyLocked(self.path)             else:                 raise LockFailed(self.path)         else:             return     def release(self):         self.remove_existing_pidfile()     def break_lock(self):         self.remove_existing_pidfile()              def read_pid_from_pidfile(self):         pid = None         try:             pidfile = open(self.path, 'r')         except IOError:             pass         else:             line = pidfile.readline().strip()             try:                 pid = int(line)             except ValueError:                 pass             pidfile.close()         return pid     def write_pid_to_pidfile(self):         pidfile_fd = os.open(self.path, os.O_CREAT | os.O_EXCL | os.O_WRONLY)         pidfile = os.fdopen(pidfile_fd, 'w')         pid = os.getpid()         pidfile.write("%s\n" % pid)         pidfile.close()             def remove_existing_pidfile(self):         if self.is_locked(): os.remove(self.path)  # example import os import traceback import pidlockfile import PIDLockFile, PIDLockError def main():     pid_file = os.path.join("C:\\", "run", "run.pid")     plock = PIDLockFile(pid_file)     try:         plock.acquire()         print "hellow"          plock.release()              except PIDLockError, exc:         print exc     except Exception, exc:         print traceback.format_exc()          if __name__ == "__main__":     main()