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authorRoland McGrath <roland@gnu.org>2001-04-01 05:02:48 +0000
committerRoland McGrath <roland@gnu.org>2001-04-01 05:02:48 +0000
commit24cf21d780e14d5a7e04257afdf67f6c7ca90f83 (patch)
tree277ca2abec573039e281975a97fe1fd9123f8719 /sysdeps
parent2e3f5f597947d07831f3104ba3753153de5346a2 (diff)
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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.
Diffstat (limited to 'sysdeps')
-rw-r--r--sysdeps/generic/atomicity.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/sysdeps/generic/atomicity.h b/sysdeps/generic/atomicity.h
index 887ce73384..28107def39 100644
--- a/sysdeps/generic/atomicity.h
+++ b/sysdeps/generic/atomicity.h
@@ -1,5 +1,5 @@
/* 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.
The GNU C Library is free software; you can redistribute it and/or
@@ -22,10 +22,11 @@
#include <inttypes.h>
+#warning stub atomicity functions are not atomic
static inline int
__attribute__ ((unused))
-exchange_and_add (uint32_t *mem, int val)
+exchange_and_add (volatile uint32_t *mem, int val)
{
int result = *mem;
*mem += val;
@@ -34,14 +35,14 @@ exchange_and_add (uint32_t *mem, int val)
static inline void
__attribute__ ((unused))
-atomic_add (uint32_t *mem, int val)
+atomic_add (volatile uint32_t *mem, int val)
{
*mem += val;
}
static inline int
__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)
return 0;