loky/backend/semlock.py
def _sem_open(name, value=None):
    """ Construct or retrieve a semaphore with the given name

    If value is None, try to retrieve an existing named semaphore.
    Else create a new semaphore with the given value
    """
    if value is None:
        handle = pthread.sem_open(ctypes.c_char_p(name), 0)
    else:
        handle = pthread.sem_open(ctypes.c_char_p(name), SEM_OFLAG, SEM_PERM,
                                  ctypes.c_int(value))

    if handle == SEM_FAILURE:
        e = ctypes.get_errno()
        if e == errno.EEXIST:
            raise FileExistsError("a semaphore named %s already exists" % name)
        elif e == errno.ENOENT:
            raise FileNotFoundError('cannot find semaphore named %s' % name)
        elif e == errno.ENOSYS:
            raise NotImplementedError('No semaphore implementation on this '
                                      'system')
        else:
            raiseFromErrno()

    return handle
def _sem_open(name, value=None):
    if value is None:
        handle = pthread.sem_open(ctypes.c_char_p(name), 0)
    else:
        handle = pthread.sem_open(ctypes.c_char_p(name), SEM_OFLAG, SEM_PERM,
                                  ctypes.c_int(value))

    if handle == SEM_FAILURE:
        e = ctypes.get_errno()
        if e == errno.EEXIST:
            raise FileExistsError("a semaphore named %s already exists" % name)
        elif e == errno.ENOENT:
            raise FileNotFoundError('cannot find semaphore named %s' % name)
        elif e == errno.ENOSYS:
            raise NotImplementedError('No semaphore implementation on this '
                                      'system')
        else:
            raiseFromErrno()

    return handle
def _sem_open ( name , value = None ) : if value is None : handle = pthread . sem_open ( ctypes . c_char_p ( name ) , 0 ) else : handle = pthread . sem_open ( ctypes . c_char_p ( name ) , SEM_OFLAG , SEM_PERM , ctypes . c_int ( value ) ) if handle == SEM_FAILURE : e = ctypes . get_errno ( ) if e == errno . EEXIST : raise FileExistsError ( "a semaphore named %s already exists" % name ) elif e == errno . ENOENT : raise FileNotFoundError ( 'cannot find semaphore named %s' % name ) elif e == errno . ENOSYS : raise NotImplementedError ( 'No semaphore implementation on this ' 'system' ) else : raiseFromErrno ( ) return handle
Construct or retrieve a semaphore with the given name

    If value is None, try to retrieve an existing named semaphore.
    Else create a new semaphore with the given value
Construct or retrieve a semaphore with the given name