From 04cf3cdfa0fead2235057ee788e6b90ce970c55f Mon Sep 17 00:00:00 2001
From: arigo <none@none>
Date: Sun, 4 Feb 2007 14:01:21 +0100
Subject: [PATCH] [svn r37901] make_numbered_dir(): in a fork() situation, only
 the last process should remove the .lock, otherwise the other processes run
 the risk of seeing their temporary dir disappear.  For now we remove the
 .lock in the parent only (i.e. we assume that the children finish before the
 parent).

This is needed for long-running pypy translate.py processes using
--fork-before.

--HG--
branch : trunk
---
 py/path/local/local.py | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/py/path/local/local.py b/py/path/local/local.py
index 90d990207..f461f4c1f 100644
--- a/py/path/local/local.py
+++ b/py/path/local/local.py
@@ -608,11 +608,19 @@ class LocalPath(common.FSPathBase, PlatformMixin):
         # put a .lock file in the new directory that will be removed at
         # process exit
         lockfile = udir.join('.lock')
+        mypid = os.getpid()
         if hasattr(lockfile, 'mksymlinkto'):
-            lockfile.mksymlinkto(str(os.getpid()))
+            lockfile.mksymlinkto(str(mypid))
         else:
-            lockfile.write(str(os.getpid()))
+            lockfile.write(str(mypid))
         def try_remove_lockfile():
+            # in a fork() situation, only the last process should
+            # remove the .lock, otherwise the other processes run the
+            # risk of seeing their temporary dir disappear.  For now
+            # we remove the .lock in the parent only (i.e. we assume
+            # that the children finish before the parent).
+            if os.getpid() != mypid:
+                return
             try:
                 lockfile.remove()
             except py.error.Error: