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* sysdeps/powerpc/pt-machine.h (MEMORY_BARRIER): Don't be __volatile__. (__compare_and_swap): Replace other 'sync' with MEMORY_BARRIER. Don't have the 'asm' __volatile__.

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2000-04-11  Geoff Keating  <geoffk@cygnus.com>

	* sysdeps/powerpc/pt-machine.h (MEMORY_BARRIER): Don't be
	__volatile__.
	(__compare_and_swap): Replace other 'sync' with MEMORY_BARRIER.
	Don't have the 'asm' __volatile__.
This commit is contained in:
Geoff Keating 2000-04-11 17:34:36 +00:00
parent de26253715
commit 4a1a3c2158
2 changed files with 20 additions and 12 deletions
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7
linuxthreads/ChangeLog
View File

@ -1,3 +1,10 @@
2000-04-11 Geoff Keating <geoffk@cygnus.com>
* sysdeps/powerpc/pt-machine.h (MEMORY_BARRIER): Don't be
__volatile__.
(__compare_and_swap): Replace other 'sync' with MEMORY_BARRIER.
Don't have the 'asm' __volatile__.
2000-04-11 Ulrich Drepper <drepper@redhat.com>
* internals.h: Define MEMORY_BARRIER as empty if not defined already.

25
linuxthreads/sysdeps/powerpc/pt-machine.h
View File

@ -1,6 +1,6 @@
/* Machine-dependent pthreads configuration and inline functions.
powerpc version.
Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
Copyright (C) 1996, 1997, 1998, 2000 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
@ -26,8 +26,9 @@
#endif
/* For multiprocessor systems, we want to ensure all memory accesses
are completed before we reset a lock. */
#define MEMORY_BARRIER() __asm__ __volatile__ ("sync" : : : "memory")
are completed before we reset a lock. On other systems, we still
need to make sure that the compiler has flushed everything to memory. */
#define MEMORY_BARRIER() __asm__ ("sync" : : : "memory")
/* Get some notion of the current stack. Need not be exactly the top
of the stack, just something somewhere in the current frame. */
@ -48,17 +49,17 @@ __compare_and_swap (long int *p, long int oldval, long int newval)
{
int ret;
sync();
__asm__ __volatile__(
"0: lwarx %0,0,%1 ;"
" xor. %0,%3,%0;"
" bne 1f;"
" stwcx. %2,0,%1;"
" bne- 0b;"
"1: "
MEMORY_BARRIER ();
__asm__ (
"0: lwarx %0,0,%1 ;"
" xor. %0,%3,%0;"
" bne 1f;"
" stwcx. %2,0,%1;"
" bne- 0b;"
"1: "
: "=&r"(ret)
: "r"(p), "r"(newval), "r"(oldval)
: "cr0", "memory");
MEMORY_BARRIER();
MEMORY_BARRIER ();
return ret == 0;
}