From 43ec4d594870656fa2fb0ef169912e288d66101a Mon Sep 17 00:00:00 2001
From: Zac Medico <zmedico@gentoo.org>
Date: Mon, 31 Dec 2012 14:24:04 -0800
Subject: _LockThread: use thread-safe EventLoop.idle_add()

---
 pym/_emerge/AsynchronousLock.py | 43 ++++++++---------------------------------
 1 file changed, 8 insertions(+), 35 deletions(-)

(limited to 'pym')

diff --git a/pym/_emerge/AsynchronousLock.py b/pym/_emerge/AsynchronousLock.py
index 5bb9663a1..2de1acdcf 100644
--- a/pym/_emerge/AsynchronousLock.py
+++ b/pym/_emerge/AsynchronousLock.py
@@ -105,19 +105,9 @@ class _LockThread(AbstractPollTask):
 	"""
 
 	__slots__ = ('path',) + \
-		('_files', '_force_dummy', '_lock_obj',
-		'_thread', '_reg_id',)
+		('_force_dummy', '_lock_obj', '_thread',)
 
 	def _start(self):
-		pr, pw = os.pipe()
-		self._files = {}
-		self._files['pipe_read'] = pr
-		self._files['pipe_write'] = pw
-		for f in self._files.values():
-			fcntl.fcntl(f, fcntl.F_SETFL,
-				fcntl.fcntl(f, fcntl.F_GETFL) | os.O_NONBLOCK)
-		self._reg_id = self.scheduler.io_add_watch(self._files['pipe_read'],
-			self.scheduler.IO_IN, self._output_handler)
 		self._registered = True
 		threading_mod = threading
 		if self._force_dummy:
@@ -128,22 +118,14 @@ class _LockThread(AbstractPollTask):
 
 	def _run_lock(self):
 		self._lock_obj = lockfile(self.path, wantnewlockfile=True)
-		os.write(self._files['pipe_write'], b'\0')
-
-	def _output_handler(self, f, event):
-		buf = None
-		if event & self.scheduler.IO_IN:
-			try:
-				buf = os.read(self._files['pipe_read'], self._bufsize)
-			except OSError as e:
-				if e.errno not in (errno.EAGAIN,):
-					raise
-		if buf:
-			self._unregister()
-			self.returncode = os.EX_OK
-			self.wait()
+		# Thread-safe callback to EventLoop
+		self.scheduler.idle_add(self._run_lock_cb)
 
-		return True
+	def _run_lock_cb(self):
+		self._unregister()
+		self.returncode = os.EX_OK
+		self.wait()
+		return False
 
 	def _cancel(self):
 		# There's currently no way to force thread termination.
@@ -164,15 +146,6 @@ class _LockThread(AbstractPollTask):
 			self._thread.join()
 			self._thread = None
 
-		if self._reg_id is not None:
-			self.scheduler.source_remove(self._reg_id)
-			self._reg_id = None
-
-		if self._files is not None:
-			for f in self._files.values():
-				os.close(f)
-			self._files = None
-
 class _LockProcess(AbstractPollTask):
 	"""
 	This uses the portage.locks module to acquire a lock asynchronously,
-- 
cgit v1.2.3-1-g7c22