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2001-03-11 Roland McGrath <roland@frob.com> 

* sysdeps/generic/atomicity.h (exchange_and_add, atomic_add,
	compare_and_swap): Add volatile qualifier to first arg, to bring
	these prototypes in line with all the other implementations.
	Add a #warning to remind the builder that these are not atomic.
This commit is contained in:
Roland McGrath 2001-04-01 05:02:48 +00:00
parent 2e3f5f5979
commit 24cf21d780
1 changed files with 5 additions and 4 deletions
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9
sysdeps/generic/atomicity.h
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@ -1,5 +1,5 @@
/* Low-level functions for atomic operations. Stub version. /* Low-level functions for atomic operations. Stub version.
Copyright (C) 1997 Free Software Foundation, Inc. Copyright (C) 1997,2001 Free Software Foundation, Inc.
This file is part of the GNU C Library. This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or The GNU C Library is free software; you can redistribute it and/or
@ -22,10 +22,11 @@
#include <inttypes.h> #include <inttypes.h>
#warning stub atomicity functions are not atomic
static inline int static inline int
__attribute__ ((unused)) __attribute__ ((unused))
exchange_and_add (uint32_t *mem, int val) exchange_and_add (volatile uint32_t *mem, int val)
{ {
int result = *mem; int result = *mem;
*mem += val; *mem += val;
@ -34,14 +35,14 @@ exchange_and_add (uint32_t *mem, int val)
static inline void static inline void
__attribute__ ((unused)) __attribute__ ((unused))
atomic_add (uint32_t *mem, int val) atomic_add (volatile uint32_t *mem, int val)
{ {
*mem += val; *mem += val;
} }
static inline int static inline int
__attribute__ ((unused)) __attribute__ ((unused))
compare_and_swap (long int *p, long int oldval, long int newval) compare_and_swap (volatile long int *p, long int oldval, long int newval)
{ {
if (*p != oldval) if (*p != oldval)
return 0; return 0;