# HG changeset patch
# User Doug Simon <doug.simon@oracle.com>
# Date 1433863422 -7200
# Node ID 518052de60d5a58dd1f319f7178953b9e561c85d
# Parent  90fd692432272179ac4783267b95f64a89ac585c
handle race creating a symlink in mx

diff -r 90fd69243227 -r 518052de60d5 mxtool/mx.py
--- a/mxtool/mx.py	Tue Jun 09 12:50:43 2015 +0200
+++ b/mxtool/mx.py	Tue Jun 09 17:23:42 2015 +0200
@@ -651,7 +651,15 @@
         if canSymlink and 'symlink' in dir(os):
             if exists(path):
                 os.unlink(path)
-            os.symlink(cachePath, path)
+            try:
+                os.symlink(cachePath, path)
+            except OSError as e:
+                # When doing parallel building, the symlink can fail
+                # if another thread wins the race to create the symlink
+                if not exists(path):
+                    # It was some other error
+                    raise e
+
         else:
             shutil.copy(cachePath, path)