Make sure all idle and timeout routines are thread safe.

Unbeknownst to me, these functions are not run thread safe:

http://library.gnome.org/devel/gdk/unstable/gdk-Threads.html

However since they are run from the main loop, the chance of them conflicting
with another running thread is slim, since we have very few threads that
actually update the UI.

src/virtManager/asyncjob.py

@@ -25,6 +25,8 @@ import gtk.gdk
 import gtk.glade
 import gobject
 
+from virtManager import util
+
 # Displays a progress bar while executing the "callback" method.
 
 class vmmAsyncJob(gobject.GObject):
@@ -61,7 +63,7 @@ class vmmAsyncJob(gobject.GObject):
         self.is_pulsing = True
 
     def run(self):
-        timer = gobject.timeout_add (100, self.exit_if_necessary)
+        timer = util.safe_timeout_add(100, self.exit_if_necessary)
         self.topwin.present()
         self.topwin.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.WATCH))
         self.bg_thread.start()
@@ -74,7 +76,7 @@ class vmmAsyncJob(gobject.GObject):
             # async dialog is running. This forces us to clean up properly
             # and not leave a dead process around.
             logging.debug("Forcing main_quit from async job.")
-            self._exit_if_necessary(force_exit=True)
+            self.exit_if_necessary(force_exit=True)
 
         self.topwin.destroy()
 
@@ -132,16 +134,10 @@ class vmmAsyncJob(gobject.GObject):
             return (None, None)
         return self._error_info
 
-    def exit_if_necessary(self):
+    def exit_if_necessary(self, force_exit=False):
-        gtk.gdk.threads_enter()
-        try:
-            return self._exit_if_necessary()
-        finally:
-            gtk.gdk.threads_leave()
-
-    def _exit_if_necessary(self, force_exit=False):
         if self.bg_thread.isAlive() and not force_exit:
             if (self.is_pulsing):
+                # Don't call pulse_pbar: this function is thread wrapped
                 self.pbar.pulse()
             return True
         else:

src/virtManager/connection.py

@@ -966,14 +966,14 @@ class vmmConnection(gobject.GObject):
         # We want to kill off this thread asap, so schedule a gobject
         # idle even to inform the UI of result
         logging.debug("Background open thread complete, scheduling notify")
-        gobject.idle_add(self._open_notify)
+        util.safe_idle_add(self._open_notify)
         self.connectThread = None
 
     def _open_notify(self):
         logging.debug("Notifying open result")
 
         try:
-            gobject.idle_add(util.idle_emit, self, "state-changed")
+            util.safe_idle_add(util.idle_emit, self, "state-changed")
 
             if self.state == self.STATE_ACTIVE:
                 caps = self.get_capabilities_xml()
@@ -988,7 +988,7 @@ class vmmConnection(gobject.GObject):
                                                  self.vms.keys())
 
             if self.state == self.STATE_DISCONNECTED:
-                gobject.idle_add(util.idle_emit, self, "connect-error",
+                util.safe_idle_add(util.idle_emit, self, "connect-error",
                                    self.connectError)
                 self.connectError = None
         finally:
@@ -1445,7 +1445,7 @@ class vmmConnection(gobject.GObject):
             for name in newNodedevs:
                 self.emit("nodedev-added", self.uri, name)
 
-        gobject.idle_add(tick_send_signals)
+        util.safe_idle_add(tick_send_signals)
 
         # Finally, we sample each domain
         now = time()
@@ -1468,7 +1468,7 @@ class vmmConnection(gobject.GObject):
         if not noStatsUpdate:
             self._recalculate_stats(now)
 
-            gobject.idle_add(util.idle_emit, self, "resources-sampled")
+            util.safe_idle_add(util.idle_emit, self, "resources-sampled")
 
         return 1
 

src/virtManager/console.py

@@ -33,6 +33,7 @@ import socket
 import logging
 import traceback
 
+from virtManager import util
 from virtManager.error import vmmErrorDialog
 
 # Console pages
@@ -477,7 +478,7 @@ class vmmConsolePages(gobject.GObject):
             logging.error("Too many connection failures, not retrying again")
             return
         logging.warn("Retrying connection in %d ms", self.vncViewerRetryDelay)
-        gobject.timeout_add(self.vncViewerRetryDelay, self.retry_login)
+        util.safe_timeout_add(self.vncViewerRetryDelay, self.retry_login)
         if self.vncViewerRetryDelay < 2000:
             self.vncViewerRetryDelay = self.vncViewerRetryDelay * 2
 
@@ -489,12 +490,8 @@ class vmmConsolePages(gobject.GObject):
                                  libvirt.VIR_DOMAIN_CRASHED ]:
             return
 
-        gtk.gdk.threads_enter()
-        try:
         self.try_login()
         return
-        finally:
-            gtk.gdk.threads_leave()
 
     def open_tunnel(self, server, vncaddr, vncport, username, sshport):
         if self.vncTunnel is not None:
@@ -676,7 +673,7 @@ class vmmConsolePages(gobject.GObject):
 
         def unset_cb(src):
             src.queue_resize_no_redraw()
-            gobject.idle_add(restore_scroll, src)
+            util.safe_idle_add(restore_scroll, src)
             return False
 
         def request_cb(src, req):
@@ -686,7 +683,7 @@ class vmmConsolePages(gobject.GObject):
 
             src.disconnect(signal_id)
 
-            gobject.idle_add(unset_cb, widget)
+            util.safe_idle_add(unset_cb, widget)
             return False
 
         # Disable scroll bars while we resize, since resizing to the VM's

src/virtManager/create.py

@@ -349,7 +349,7 @@ class vmmCreate(gobject.GObject):
 
         # Storage
         if not self.host_storage_timer:
-            self.host_storage_timer = gobject.timeout_add(3 * 1000,
+            self.host_storage_timer = util.safe_timeout_add(3 * 1000,
                                                           self.host_space_tick)
         self.window.get_widget("enable-storage").set_active(True)
         self.window.get_widget("config-storage-create").set_active(True)

src/virtManager/domain.py

@@ -1357,7 +1357,7 @@ class vmmDomain(vmmDomainBase):
         if origxml != self._xml:
             # 'tick' to make sure we have the latest time
             self.tick(time.time())
-            gobject.idle_add(util.idle_emit, self, "config-changed")
+            util.safe_idle_add(util.idle_emit, self, "config-changed")
 
     def _redefine(self, xml_func, *args):
         """
@@ -1848,7 +1848,7 @@ class vmmDomain(vmmDomainBase):
                 self._startup_vcpus = None
                 self.vcpu_max_count()
             self.lastStatus = status
-            gobject.idle_add(util.idle_emit, self, "status-changed", status)
+            util.safe_idle_add(util.idle_emit, self, "status-changed", status)
 
 
     def tick(self, now):
@@ -1917,7 +1917,7 @@ class vmmDomain(vmmDomainBase):
 
         self.record.insert(0, newStats)
         self._update_status(info[0])
-        gobject.idle_add(util.idle_emit, self, "resources-sampled")
+        util.safe_idle_add(util.idle_emit, self, "resources-sampled")
 
 
 class vmmDomainVirtinst(vmmDomainBase):

src/virtManager/engine.py

@@ -191,6 +191,8 @@ class vmmEngine(gobject.GObject):
             gobject.source_remove(self.timer)
             self.timer = None
 
+        # No need to use 'safe_timeout_add', the tick should be
+        # manually made thread safe
         self.timer = gobject.timeout_add(interval, self.tick)
 
     def tick(self):
@@ -205,7 +207,7 @@ class vmmEngine(gobject.GObject):
 
         self._tick_thread = threading.Thread(name="Tick thread",
                                             target=self._tick, args=())
-        self._tick_thread.daemon = False
+        self._tick_thread.daemon = True
         self._tick_thread.start()
         return 1
 
@@ -221,7 +223,7 @@ class vmmEngine(gobject.GObject):
                     logging.exception("Could not refresh connection %s." % uri)
                     logging.debug("Closing connection since libvirtd "
                                   "appears to have stopped.")
-                    gobject.idle_add(conn.close)
+                    util.safe_idle_add(conn.close)
                 else:
                     raise
         return 1

src/virtManager/mediadev.py

@@ -23,6 +23,8 @@ import logging
 
 import virtinst
 
+from virtManager import util
+
 MEDIA_FLOPPY = "floppy"
 MEDIA_CDROM = "cdrom"
 
@@ -136,7 +138,7 @@ class vmmMediaDevice(gobject.GObject):
         if self.poll_signal:
             return
 
-        self.poll_signal = gobject.timeout_add(MEDIA_TIMEOUT * 1000,
+        self.poll_signal = util.safe_timeout_add(MEDIA_TIMEOUT * 1000,
                                                  self._poll_for_media)
 
     def disable_poll_for_media(self):

src/virtManager/util.py

@@ -18,12 +18,14 @@
 # MA 02110-1301 USA.
 #
 
-import logging
 import gtk
-import libxml2
+import gobject
-import os.path
 
 import libvirt
+import libxml2
+
+import logging
+import os.path
 
 import virtManager
 import virtinst
@@ -245,6 +247,25 @@ def idle_emit(self, signal, *args):
     self.emit(signal, *args)
     return False
 
+def _safe_wrapper(func, *args):
+    gtk.gdk.threads_enter()
+    try:
+        func(*args)
+    finally:
+        gtk.gdk.threads_leave()
+
+def safe_idle_add(func, *args):
+    """
+    Make sure idle functions are run thread safe
+    """
+    return gobject.idle_add(_safe_wrapper, func, *args)
+
+def safe_timeout_add(timeout, func, *args):
+    """
+    Make sure timeout functions are run thread safe
+    """
+    return gobject.timeout_add(timeout, _safe_wrapper, func, *args)
+
 def uuidstr(rawuuid):
     hx = ['0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f']
     uuid = []