License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
-/* Activate all C11 atomic builtins.
-
- Note:
- E.g. in nptl/pthread_key_delete.c if compiled with GCCs 6 and before,
- an extra stack-frame is generated and the old value is stored on stack
- before cs instruction but it never loads this value from stack.
- An unreleased GCC 7 omit those stack operations.
-
- E.g. in nptl/pthread_once.c the condition code of cs instruction is
- evaluated by a sequence of ipm, sra, compare and jump instructions instead
- of one conditional jump instruction. This also occurs with an unreleased
- GCC 7.
-
- The atomic_fetch_abc_def C11 builtins are now using load-and-abc instructions
- on z196 zarch and higher cpus instead of a loop with compare-and-swap
- instruction. */
-#define USE_ATOMIC_COMPILER_BUILTINS 1
-
#ifdef __s390x__
# define __HAVE_64B_ATOMICS 1
#else
#endif
#define ATOMIC_EXCHANGE_USES_CAS 1
-
-/* Implement some of the non-C11 atomic macros from include/atomic.h
- with help of the C11 atomic builtins. The other non-C11 atomic macros
- are using the macros defined here. */
-
-/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
- Return the old *MEM value. */
-#define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \
- ({ __atomic_check_size((mem)); \
- typeof ((__typeof (*(mem))) *(mem)) __atg1_oldval = (oldval); \
- __atomic_compare_exchange_n (mem, (void *) &__atg1_oldval, \
- newval, 1, __ATOMIC_ACQUIRE, \
- __ATOMIC_RELAXED); \
- __atg1_oldval; })
-#define atomic_compare_and_exchange_val_rel(mem, newval, oldval) \
- ({ __atomic_check_size((mem)); \
- typeof ((__typeof (*(mem))) *(mem)) __atg1_2_oldval = (oldval); \
- __atomic_compare_exchange_n (mem, (void *) &__atg1_2_oldval, \
- newval, 1, __ATOMIC_RELEASE, \
- __ATOMIC_RELAXED); \
- __atg1_2_oldval; })
-
-/* Atomically store NEWVAL in *MEM if *MEM is equal to OLDVAL.
- Return zero if *MEM was changed or non-zero if no exchange happened. */
-#define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
- ({ __atomic_check_size((mem)); \
- typeof ((__typeof (*(mem))) *(mem)) __atg2_oldval = (oldval); \
- !__atomic_compare_exchange_n (mem, (void *) &__atg2_oldval, newval, \
- 1, __ATOMIC_ACQUIRE, \
- __ATOMIC_RELAXED); })
-#define catomic_compare_and_exchange_bool_acq(mem, newval, oldval) \
- atomic_compare_and_exchange_bool_acq (mem, newval, oldval)
-
-/* Store NEWVALUE in *MEM and return the old value. */
-#define atomic_exchange_acq(mem, newvalue) \
- ({ __atomic_check_size((mem)); \
- __atomic_exchange_n (mem, newvalue, __ATOMIC_ACQUIRE); })
-#define atomic_exchange_rel(mem, newvalue) \
- ({ __atomic_check_size((mem)); \
- __atomic_exchange_n (mem, newvalue, __ATOMIC_RELEASE); })
-
-/* Add VALUE to *MEM and return the old value of *MEM. */
-/* The gcc builtin uses load-and-add instruction on z196 zarch and higher cpus
- instead of a loop with compare-and-swap instruction. */
-# define atomic_exchange_and_add_acq(mem, operand) \
- ({ __atomic_check_size((mem)); \
- __atomic_fetch_add ((mem), (operand), __ATOMIC_ACQUIRE); })
-# define atomic_exchange_and_add_rel(mem, operand) \
- ({ __atomic_check_size((mem)); \
- __atomic_fetch_add ((mem), (operand), __ATOMIC_RELEASE); })
-#define catomic_exchange_and_add(mem, value) \
- atomic_exchange_and_add (mem, value)
-
-/* Atomically *mem |= mask and return the old value of *mem. */
-/* The gcc builtin uses load-and-or instruction on z196 zarch and higher cpus
- instead of a loop with compare-and-swap instruction. */
-#define atomic_or_val(mem, operand) \
- ({ __atomic_check_size((mem)); \
- __atomic_fetch_or ((mem), (operand), __ATOMIC_ACQUIRE); })
-/* Atomically *mem |= mask. */
-#define atomic_or(mem, mask) \
- do { \
- atomic_or_val (mem, mask); \
- } while (0)
-#define catomic_or(mem, mask) \
- atomic_or (mem, mask)
-
-/* Atomically *mem |= 1 << bit and return true if the bit was set in old value
- of *mem. */
-/* The load-and-or instruction is used on z196 zarch and higher cpus
- instead of a loop with compare-and-swap instruction. */
-#define atomic_bit_test_set(mem, bit) \
- ({ __typeof (*(mem)) __atg14_old; \
- __typeof (mem) __atg14_memp = (mem); \
- __typeof (*(mem)) __atg14_mask = ((__typeof (*(mem))) 1 << (bit)); \
- __atg14_old = atomic_or_val (__atg14_memp, __atg14_mask); \
- __atg14_old & __atg14_mask; })
-
-/* Atomically *mem &= mask and return the old value of *mem. */
-/* The gcc builtin uses load-and-and instruction on z196 zarch and higher cpus
- instead of a loop with compare-and-swap instruction. */
-#define atomic_and_val(mem, operand) \
- ({ __atomic_check_size((mem)); \
- __atomic_fetch_and ((mem), (operand), __ATOMIC_ACQUIRE); })
-/* Atomically *mem &= mask. */
-#define atomic_and(mem, mask) \
- do { \
- atomic_and_val (mem, mask); \
- } while (0)
-#define catomic_and(mem, mask) \
- atomic_and(mem, mask)
projects / thirdparty / glibc.git / commitdiff
