[Pcre-svn] [1647] code/trunk: A racing condition is fixed in…

Revision: 1647

          http://vcs.pcre.org/viewvc?view=rev&revision=1647
Author:   zherczeg
Date:     2016-05-19 19:02:51 +0100 (Thu, 19 May 2016)
Log Message:
-----------
A racing condition is fixed in JIT reported by Mozilla.

Modified Paths:
--------------
    code/trunk/ChangeLog
    code/trunk/sljit/sljitUtils.c

Modified: code/trunk/ChangeLog
===================================================================
--- code/trunk/ChangeLog    2016-04-12 11:17:23 UTC (rev 1646)
+++ code/trunk/ChangeLog    2016-05-19 18:02:51 UTC (rev 1647)
@@ -79,7 +79,9 @@
     that certain errors, provoked by the SSE2 instruction set when JIT is used, 
     are ignored. 

+20. A racing condition is fixed in JIT reported by Mozilla.

+
Version 8.38 23-November-2015
-----------------------------

Modified: code/trunk/sljit/sljitUtils.c
===================================================================
--- code/trunk/sljit/sljitUtils.c    2016-04-12 11:17:23 UTC (rev 1646)
+++ code/trunk/sljit/sljitUtils.c    2016-05-19 18:02:51 UTC (rev 1647)
@@ -182,7 +182,10 @@
 static SLJIT_INLINE sljit_s32 open_dev_zero(void)
 {
     pthread_mutex_lock(&dev_zero_mutex);
-    dev_zero = open("/dev/zero", O_RDWR);
+    /* The dev_zero might be initialized by another thread during the waiting. */
+    if (dev_zero < 0) {
+        dev_zero = open("/dev/zero", O_RDWR);
+    }
     pthread_mutex_unlock(&dev_zero_mutex);
     return dev_zero < 0;
 }