Mercurial > traipse_dev

diff upmana/mercurial/lock.py @ 135:dcf4fbe09b70 beta
Traipse Beta 'OpenRPG' {091010-00} Traipse is a distribution of OpenRPG that is designed to be easy to setup and go. Traipse also makes it easy for developers to work on code without fear of sacrifice. 'Ornery-Orc' continues the trend of 'Grumpy' and adds fixes to the code. 'Ornery-Orc's main goal is to offer more advanced features and enhance the productivity of the user. Update Summary (Beta) Added Bookmarks Fix to Remote Admin Commands Minor fix to text based Server Fix to Pretty Print, from Core Fix to Splitter Nodes not being created Fix to massive amounts of images loading, from Core Added 'boot' command to remote admin Added confirmation window for sent nodes Minor changes to allow for portability to an OpenSUSE linux OS Miniatures Layer pop up box allows users to turn off Mini labels, from FlexiRPG Zoom Mouse plugin added Images added to Plugin UI Switching to Element Tree Map efficiency, from FlexiRPG Added Status Bar to Update Manager default_manifest.xml renamed to default_upmana.xml Cleaner clode for saved repositories New TrueDebug Class in orpg_log (See documentation for usage) Mercurial's hgweb folder is ported to upmana **Pretty important update that can help remove thousands of dead children from your gametree. **Children, <forms />, <group_atts />, <horizontal />, <cols />, <rows />, <height />, etc... are all tags now. Check your gametree and look for dead children!! **New Gamtree Recusion method, mapping, and context sensitivity. !!Alpha - Watch out for infinite loops!!
author: sirebral
date: Tue, 10 Nov 2009 14:11:28 -0600
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/upmana/mercurial/lock.py	Tue Nov 10 14:11:28 2009 -0600
@@ -0,0 +1,128 @@
+# lock.py - simple locking scheme for mercurial
+#
+# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
+import util, error
+import errno, os, socket, time
+import warnings
+
+class lock(object):
+    # lock is symlink on platforms that support it, file on others.
+
+    # symlink is used because create of directory entry and contents
+    # are atomic even over nfs.
+
+    # old-style lock: symlink to pid
+    # new-style lock: symlink to hostname:pid
+
+    _host = None
+
+    def __init__(self, file, timeout=-1, releasefn=None, desc=None):
+        self.f = file
+        self.held = 0
+        self.timeout = timeout
+        self.releasefn = releasefn
+        self.desc = desc
+        self.lock()
+
+    def __del__(self):
+        if self.held:
+            warnings.warn("use lock.release instead of del lock",
+                    category=DeprecationWarning,
+                    stacklevel=2)
+
+            # ensure the lock will be removed
+            # even if recursive locking did occur
+            self.held = 1
+
+        self.release()
+
+    def lock(self):
+        timeout = self.timeout
+        while 1:
+            try:
+                self.trylock()
+                return 1
+            except error.LockHeld, inst:
+                if timeout != 0:
+                    time.sleep(1)
+                    if timeout > 0:
+                        timeout -= 1
+                    continue
+                raise error.LockHeld(errno.ETIMEDOUT, inst.filename, self.desc,
+                                     inst.locker)
+
+    def trylock(self):
+        if self.held:
+            self.held += 1
+            return
+        if lock._host is None:
+            lock._host = socket.gethostname()
+        lockname = '%s:%s' % (lock._host, os.getpid())
+        while not self.held:
+            try:
+                util.makelock(lockname, self.f)
+                self.held = 1
+            except (OSError, IOError), why:
+                if why.errno == errno.EEXIST:
+                    locker = self.testlock()
+                    if locker is not None:
+                        raise error.LockHeld(errno.EAGAIN, self.f, self.desc,
+                                             locker)
+                else:
+                    raise error.LockUnavailable(why.errno, why.strerror,
+                                                why.filename, self.desc)
+
+    def testlock(self):
+        """return id of locker if lock is valid, else None.
+
+        If old-style lock, we cannot tell what machine locker is on.
+        with new-style lock, if locker is on this machine, we can
+        see if locker is alive.  If locker is on this machine but
+        not alive, we can safely break lock.
+
+        The lock file is only deleted when None is returned.
+
+        """
+        locker = util.readlock(self.f)
+        try:
+            host, pid = locker.split(":", 1)
+        except ValueError:
+            return locker
+        if host != lock._host:
+            return locker
+        try:
+            pid = int(pid)
+        except:
+            return locker
+        if util.testpid(pid):
+            return locker
+        # if locker dead, break lock.  must do this with another lock
+        # held, or can race and break valid lock.
+        try:
+            l = lock(self.f + '.break')
+            l.trylock()
+            os.unlink(self.f)
+            l.release()
+        except error.LockError:
+            return locker
+
+    def release(self):
+        if self.held > 1:
+            self.held -= 1
+        elif self.held is 1:
+            self.held = 0
+            if self.releasefn:
+                self.releasefn()
+            try:
+                os.unlink(self.f)
+            except: pass
+
+def release(*locks):
+    for lock in locks:
+        if lock is not None:
+            lock.release()
+
author	sirebral
date	Tue, 10 Nov 2009 14:11:28 -0600
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