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* sysdeps/unix/sysv/linux/fork.c (__libc_fork): Add memory barrier

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to force runp->refcntr to be read from memory.
This commit is contained in:
Ulrich Drepper 2008-10-06 16:47:10 +00:00
parent 2fdde3b920
commit af62b44029
2 changed files with 9 additions and 1 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2008-09-11 Martin Schwidefsky <schwidefsky@de.ibm.com>
* sysdeps/unix/sysv/linux/fork.c (__libc_fork): Add memory barrier
to force runp->refcntr to be read from memory.
2008-09-18 Andreas Schwab <schwab@suse.de>
[BZ #6942]

5
nptl/sysdeps/unix/sysv/linux/fork.c
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2007 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2007, 2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -64,6 +64,9 @@ __libc_fork (void)
struct fork_handler *runp;
while ((runp = __fork_handlers) != NULL)
{
/* Make sure we read from the current RUNP pointer. */
atomic_full_barrier ();
unsigned int oldval = runp->refcntr;
if (oldval == 0)