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authorRoland McGrath <roland@gnu.org>2003-03-22 23:01:01 +0000
committerRoland McGrath <roland@gnu.org>2003-03-22 23:01:01 +0000
commitd15851ec24d31ccf3ee9a4a388104974d1f494dc (patch)
tree6ad9a310067d563e20b58cd275fac04cdea53c04 /include/atomic.h
parent38ed16cf8860812f4f18d19a69fc031ab9da1156 (diff)
downloadglibc-d15851ec24d31ccf3ee9a4a388104974d1f494dc.tar.gz
* include/atomic.h (atomic_increment_and_test): Invert sense of test.
Add comment. (atomic_decrement_and_test): Add comment. 2003-03-22 Jakub Jelinek <jakub@redhat.com> * include/atomic.h (atomic_compare_and_exchange_val_acq): Add comment. Don't define if __arch_compare_and_exchange_val_32_acq is not defined. (atomic_compare_and_exchange_bool_acq): Add comment. Don't use __oldval variable in the macro, since it might be macro argument. (atomic_decrement_if_positive): Initialize __memp, remove setting of non-existent variable. (atomic_bit_test_set): Cast 1 to __typeof (*mem) before shifting. * sysdeps/ia64/bits/atomic.h (atomic_exchange_and_add): Implement using atomic_compare_and_exchange_val_acq. (atomic_decrement_if_positive, atomic_bit_test_set): Define. * sysdeps/s390/bits/atomic.h (__arch_compare_and_exchange_val_8_acq): Renamed from... (__arch_compare_and_exchange_bool_8_acq): ... this. (__arch_compare_and_exchange_val_16_acq): Renamed from... (__arch_compare_and_exchange_bool_16_acq): ... this. (__arch_compare_and_exchange_val_32_acq): Return old value. Renamed from... (__arch_compare_and_exchange_bool_32_acq): ... this. (__arch_compare_and_exchange_val_64_acq): Return old value. Renamed from... (__arch_compare_and_exchange_bool_64_acq): ... this. (__arch_compare_and_exchange_val_32_acq): Use __typeof for local variables types instead of assuming int. Change prefix of local variables to __arch. * sysdeps/generic/bits/atomic.h (arch_compare_and_exchange_acq): Remove. (atomic_compare_and_exchange_val_acq, atomic_compare_and_exchange_bool_acq): Define. * csu/tst-atomic.c: New test. * csu/tst-atomic-long.c: New test. * csu/Makefile (tests): Add tst-atomic and tst-atomic-long. * malloc/memusagestat.c (main): Kill warning if uint64_t is ulong. * sysdeps/s390/Versions: Add trailing newline. * sysdeps/unix/sysv/linux/sysconf.c (__sysconf): Kill warning if INTERNAL_SYSCALL_ERROR_P doesn't use its first argument.
Diffstat (limited to 'include/atomic.h')
-rw-r--r--include/atomic.h25
1 files changed, 17 insertions, 8 deletions
diff --git a/include/atomic.h b/include/atomic.h
index 017a8455d7..9469866ebe 100644
--- a/include/atomic.h
+++ b/include/atomic.h
@@ -1,4 +1,5 @@
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Internal macros for atomic operations for GNU C Library.
+ Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@@ -25,7 +26,10 @@
#include <bits/atomic.h>
-#ifndef atomic_compare_and_exchange_val_acq
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return the old *MEM value. */
+#if !defined atomic_compare_and_exchange_val_acq \
+ && defined __arch_compare_and_exchange_val_32_acq
# define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
({ __typeof (*mem) __result; \
if (sizeof (*mem) == 1) \
@@ -48,6 +52,8 @@
#endif
+/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
+ Return zero if *MEM was changed or non-zero if no exchange happened. */
#ifndef atomic_compare_and_exchange_bool_acq
# ifdef __arch_compare_and_exchange_bool_32_acq
# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
@@ -69,8 +75,10 @@
__result; })
# else
# define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
- ({ __typeof (oldval) __oldval = (oldval); \
- atomic_compare_and_exchange_val_acq (mem, newval, __oldval) != __oldval; \
+ ({ /* Cannot use __oldval here, because macros later in this file might \
+ call this macro with __oldval argument. */ \
+ __typeof (oldval) __old = (oldval); \
+ atomic_compare_and_exchange_val_acq (mem, newval, __old) != __old; \
})
# endif
#endif
@@ -129,9 +137,10 @@
#endif
+/* Add one to *MEM and return true iff it's now nonzero. */
#ifndef atomic_increment_and_test
# define atomic_increment_and_test(mem) \
- (atomic_exchange_and_add (mem, 1) == 0)
+ (atomic_exchange_and_add (mem, 1) != 0)
#endif
@@ -140,6 +149,7 @@
#endif
+/* Subtract 1 from *MEM and return true iff it's now zero. */
#ifndef atomic_decrement_and_test
# define atomic_decrement_and_test(mem) \
(atomic_exchange_and_add (mem, -1) == 0)
@@ -150,9 +160,8 @@
#ifndef atomic_decrement_if_positive
# define atomic_decrement_if_positive(mem) \
({ __typeof (*mem) __oldval; \
- __typeof (mem) __memp; \
+ __typeof (mem) __memp = (mem); \
\
- __val = *__memp; \
do \
{ \
__oldval = *__memp; \
@@ -190,7 +199,7 @@
# define atomic_bit_test_set(mem, bit) \
({ __typeof (*mem) __oldval; \
__typeof (mem) __memp = (mem); \
- __typeof (*mem) __mask = (1 << (bit)); \
+ __typeof (*mem) __mask = ((__typeof (*mem)) 1 << (bit)); \
\
do \
__oldval = (*__memp); \