def singleinstance(name):
"""
Return True if no other instance of the application identified by name is running,
False otherwise.
@param name: The name to lock.
@type name: string
"""
if iswindows:
mutexname = "mutexforsingleinstanceof" + __appname__ + name
mutex = win32event.CreateMutex(None, False, mutexname)
err = win32api.GetLastError()
if err == winerror.ERROR_ALREADY_EXISTS:
# Close this handle other wise this handle will prevent the mutex
# from being deleted when the process that created it exits.
win32api.CloseHandle(mutex)
elif mutex and err != winerror.ERROR_INVALID_HANDLE:
atexit.register(win32api.CloseHandle, mutex)
return not err == winerror.ERROR_ALREADY_EXISTS
else:
path = os.path.expanduser("~/." + __appname__ + "_" + name + ".lock")
try:
f = open(path, "w")
fcntl.lockf(f.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
atexit.register(_clean_lock_file, f)
return True
except IOError:
return False
return False
def singleinstance(name):
'''
Return True if no other instance of the application identified by name is running,
False otherwise.
@param name: The name to lock.
@type name: string
'''
if iswindows:
mutexname = 'mutexforsingleinstanceof'+__appname__+name
mutex = win32event.CreateMutex(None, False, mutexname)
err = win32api.GetLastError()
if err == winerror.ERROR_ALREADY_EXISTS:
# Close this handle other wise this handle will prevent the mutex
# from being deleted when the process that created it exits.
win32api.CloseHandle(mutex)
elif mutex and err != winerror.ERROR_INVALID_HANDLE:
atexit.register(win32api.CloseHandle, mutex)
return not err == winerror.ERROR_ALREADY_EXISTS
else:
path = os.path.expanduser('~/.'+__appname__+'_'+name+'.lock')
try:
f = open(path, 'w')
fcntl.lockf(f.fileno(), fcntl.LOCK_EX|fcntl.LOCK_NB)
atexit.register(_clean_lock_file, f)
return True
except IOError:
return False
return False
def __enter__(self):
self.file = WindowsExclFile(self.path, self.timeout) if iswindows else unix_open(self.path)
self.file.seek(0)
timeout = self.timeout
if not iswindows:
while self.timeout < 0 or timeout >= 0:
try:
fcntl.lockf(self.file.fileno(), fcntl.LOCK_EX | fcntl.LOCK_NB)
break
except IOError:
time.sleep(1)
timeout -= 1
if timeout < 0 and self.timeout >= 0:
self.file.close()
raise LockError("Failed to lock")
return self.file
def __enter__(self):
self.file = WindowsExclFile(self.path, self.timeout) if iswindows else unix_open(self.path)
self.file.seek(0)
timeout = self.timeout
if not iswindows:
while self.timeout < 0 or timeout >= 0:
try:
fcntl.lockf(self.file.fileno(), fcntl.LOCK_EX|fcntl.LOCK_NB)
break
except IOError:
time.sleep(1)
timeout -= 1
if timeout < 0 and self.timeout >= 0:
self.file.close()
raise LockError('Failed to lock')
return self.file
