def create_thread_notifier_pipe(new = True, purge = False):
"""
Creates a new pipe for the thread notifier. If new is True, a new pipe
will always be created; if it is False, it will only be created if one
already exists. If purge is True, any previously queued work will be
discarded.
This is an internal function, but we export it for kaa.utils.daemonize.
"""
global _thread_notifier_pipe
log.info('create thread notifier pipe')
if not _thread_notifier_pipe and not new:
return
elif _thread_notifier_pipe:
# There is an existing pipe already, so stop monitoring it.
notifier.socket_remove(_thread_notifier_pipe[0])
if purge:
_thread_notifier_lock.acquire()
del _thread_notifier_queue[:]
_thread_notifier_lock.release()
_thread_notifier_pipe = os.pipe()
fcntl.fcntl(_thread_notifier_pipe[0], fcntl.F_SETFL, os.O_NONBLOCK)
fcntl.fcntl(_thread_notifier_pipe[1], fcntl.F_SETFL, os.O_NONBLOCK)
notifier.socket_add(_thread_notifier_pipe[0], _thread_notifier_run_queue)
if _thread_notifier_queue:
# A thread is already running and wanted to run something in the
# mainloop before the mainloop is started. In that case we need
# to wakeup the loop ASAP to handle the requests.
os.write(_thread_notifier_pipe[1], "1")
def close( self ):
"""
Close the IO to the child.
"""
notifier.socket_remove( self.fp )
self.fp.close()
if self.logger:
self.logger.close()
self.logger = None
def unregister(self):
"""
Unregister the IOMonitor
"""
if not self.active:
return
if not is_mainthread():
return MainThreadCallback(self.unregister)()
notifier.socket_remove(self._id, self._condition-1)
super(IOMonitor, self).unregister()
except IOError, (errno, msg):
if errno == 11 and not flushing:
# Resource temporarily unavailable; if we try to read on a
# non-blocking descriptor we'll get this message. If we're
# being called from flush(), it could be because the child
# process is dead, in which case this errno will occur but
# we don't want to return True.
return True
data = None
except ValueError:
# socket already closed
return False
if not data:
log.info('No data on %s for pid %s.' % ( self.name, os.getpid()))
notifier.socket_remove( self.fp )
self.fp.close()
if self.logger:
self.logger.close()
# FIXME: we know the child is dead. Rather than wait for it
# to be reaped we can call __child_died in Process instance.
return False
if self.raw_signal.count():
self.raw_signal.emit(data)
if self.signal.count() == 0:
# Nothing connected to the per-line handler, so need to parse.
# (And if we're dealing with binary data, it may be important
# _not to parse.)
return True
