glibc/sysdeps/unix/sysv/linux/loongarch/atomic-machine.h

/* Atomic operations.
   Copyright (C) 2022-2025 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
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library.  If not, see
   <https://www.gnu.org/licenses/>.  */

#ifndef _LINUX_LOONGARCH_BITS_ATOMIC_H
#define _LINUX_LOONGARCH_BITS_ATOMIC_H 1

#define atomic_full_barrier() __sync_synchronize ()

#define __HAVE_64B_ATOMICS (__loongarch_grlen >= 64)
#define USE_ATOMIC_COMPILER_BUILTINS 1
#define ATOMIC_EXCHANGE_USES_CAS 0

/* Compare and exchange.
   For all "bool" routines, we return FALSE if exchange successful.  */

#define __arch_compare_and_exchange_bool_8_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				  __ATOMIC_RELAXED); \
  })

#define __arch_compare_and_exchange_bool_16_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				  __ATOMIC_RELAXED); \
  })

#define __arch_compare_and_exchange_bool_32_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				  __ATOMIC_RELAXED); \
  })

#define __arch_compare_and_exchange_bool_64_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    !__atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				  __ATOMIC_RELAXED); \
  })

#define __arch_compare_and_exchange_val_8_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				 __ATOMIC_RELAXED); \
    __oldval; \
  })

#define __arch_compare_and_exchange_val_16_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				 __ATOMIC_RELAXED); \
    __oldval; \
  })

#define __arch_compare_and_exchange_val_32_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				 __ATOMIC_RELAXED); \
    __oldval; \
  })

#define __arch_compare_and_exchange_val_64_int(mem, newval, oldval, model) \
  ({ \
    typeof (*mem) __oldval = (oldval); \
    __atomic_compare_exchange_n (mem, (void *) &__oldval, newval, 0, model, \
				 __ATOMIC_RELAXED); \
    __oldval; \
  })

/* Atomic compare and exchange.  */

#define atomic_compare_and_exchange_bool_acq(mem, new, old) \
  __atomic_bool_bysize (__arch_compare_and_exchange_bool, int, mem, new, old, \
			__ATOMIC_ACQUIRE)

#define atomic_compare_and_exchange_val_acq(mem, new, old) \
  __atomic_val_bysize (__arch_compare_and_exchange_val, int, mem, new, old, \
		       __ATOMIC_ACQUIRE)

#define atomic_compare_and_exchange_val_rel(mem, new, old) \
  __atomic_val_bysize (__arch_compare_and_exchange_val, int, mem, new, old, \
		       __ATOMIC_RELEASE)

/* Atomic exchange (without compare).  */

#define __arch_exchange_8_int(mem, newval, model) \
  __atomic_exchange_n (mem, newval, model)

#define __arch_exchange_16_int(mem, newval, model) \
  __atomic_exchange_n (mem, newval, model)

#define __arch_exchange_32_int(mem, newval, model) \
  __atomic_exchange_n (mem, newval, model)

#define __arch_exchange_64_int(mem, newval, model) \
  __atomic_exchange_n (mem, newval, model)

#define atomic_exchange_acq(mem, value) \
  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_ACQUIRE)

#define atomic_exchange_rel(mem, value) \
  __atomic_val_bysize (__arch_exchange, int, mem, value, __ATOMIC_RELEASE)

/* Atomically add value and return the previous (unincremented) value.  */

#define __arch_exchange_and_add_8_int(mem, value, model) \
  __atomic_fetch_add (mem, value, model)

#define __arch_exchange_and_add_16_int(mem, value, model) \
  __atomic_fetch_add (mem, value, model)

#define __arch_exchange_and_add_32_int(mem, value, model) \
  __atomic_fetch_add (mem, value, model)

#define __arch_exchange_and_add_64_int(mem, value, model) \
  __atomic_fetch_add (mem, value, model)

#define atomic_exchange_and_add_acq(mem, value) \
  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
		       __ATOMIC_ACQUIRE)

#define atomic_exchange_and_add_rel(mem, value) \
  __atomic_val_bysize (__arch_exchange_and_add, int, mem, value, \
		       __ATOMIC_RELEASE)

#endif /* bits/atomic.h */