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2008-08-02 Roland McGrath <roland@frob.com>

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* sysdeps/mach/i386/machine-lock.h (__spin_unlock, __spin_try_lock):
	Add memory clobbers.
This commit is contained in:
Roland McGrath 2008-08-02 20:12:08 +00:00
parent 48b22986cc
commit 4c8ac84562
1 changed files with 5 additions and 3 deletions
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8
sysdeps/mach/i386/machine-lock.h
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@ -1,5 +1,5 @@
/* Machine-specific definition for spin locks. i386 version.
Copyright (C) 1994, 1997, 2007 Free Software Foundation, Inc.
Copyright (C) 1994,1997,2007,2008 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -40,7 +40,8 @@ __spin_unlock (__spin_lock_t *__lock)
{
register int __unlocked;
__asm__ __volatile ("xchgl %0, %1"
: "=&r" (__unlocked), "=m" (*__lock) : "0" (0));
: "=&r" (__unlocked), "=m" (*__lock) : "0" (0)
: : "memory");
}
/* Try to lock LOCK; return nonzero if we locked it, zero if another has. */
@ -50,7 +51,8 @@ __spin_try_lock (__spin_lock_t *__lock)
{
register int __locked;
__asm__ __volatile ("xchgl %0, %1"
: "=&r" (__locked), "=m" (*__lock) : "0" (1));
: "=&r" (__locked), "=m" (*__lock) : "0" (1)
: : "memory");
return !__locked;
}