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Clarified return value of atomic macros

This commit is contained in:
Nobuyoshi Nakada 2020-04-26 19:34:07 +09:00
parent 36ed700711
commit 1760c60174
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GPG Key ID: 7CD2805BFA3770C6
Notes: git 2020-04-26 21:46:43 +09:00 
Merged: https://github.com/ruby/ruby/pull/3061
1 changed files with 56 additions and 13 deletions
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69
ruby_atomic.h
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@ -1,12 +1,17 @@
#ifndef RUBY_ATOMIC_H
#define RUBY_ATOMIC_H
/*
* - ATOMIC_CAS, ATOMIC_EXCHANGE, ATOMIC_FETCH_*:
* return the old * value.
* - ATOMIC_ADD, ATOMIC_SUB, ATOMIC_INC, ATOMIC_DEC, ATOMIC_OR, ATOMIC_SET:
* may be void.
*/
#if 0
#elif defined HAVE_GCC_ATOMIC_BUILTINS
typedef unsigned int rb_atomic_t;
# define ATOMIC_SET(var, val) (void)__atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_INC(var) __atomic_fetch_add(&(var), 1, __ATOMIC_SEQ_CST)
# define ATOMIC_DEC(var) __atomic_fetch_sub(&(var), 1, __ATOMIC_SEQ_CST)
# define ATOMIC_FETCH_ADD(var, val) __atomic_fetch_add(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_FETCH_SUB(var, val) __atomic_fetch_sub(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_OR(var, val) __atomic_fetch_or(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_EXCHANGE(var, val) __atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_CAS(var, oldval, newval) RB_GNUC_EXTENSION_BLOCK( \
@ -14,9 +19,6 @@ typedef unsigned int rb_atomic_t;
__atomic_compare_exchange_n(&(var), &oldvaldup, (newval), 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
oldvaldup )
# define ATOMIC_SIZE_ADD(var, val) __atomic_fetch_add(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_SIZE_SUB(var, val) __atomic_fetch_sub(&(var), (val), __ATOMIC_SEQ_CST)
# define RUBY_ATOMIC_GENERIC_MACRO 1
#elif defined HAVE_GCC_SYNC_BUILTINS
@ -25,16 +27,12 @@ typedef unsigned int rb_atomic_t;
* http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html */
typedef unsigned int rb_atomic_t; /* Anything OK */
# define ATOMIC_SET(var, val) (void)__sync_lock_test_and_set(&(var), (val))
# define ATOMIC_INC(var) __sync_fetch_and_add(&(var), 1)
# define ATOMIC_DEC(var) __sync_fetch_and_sub(&(var), 1)
# define ATOMIC_FETCH_ADD(var, val) __sync_fetch_and_add(&(var), (val))
# define ATOMIC_FETCH_SUB(var, var) __sync_fetch_and_sub(&(var), (val))
# define ATOMIC_OR(var, val) __sync_fetch_and_or(&(var), (val))
# define ATOMIC_EXCHANGE(var, val) __sync_lock_test_and_set(&(var), (val))
# define ATOMIC_CAS(var, oldval, newval) __sync_val_compare_and_swap(&(var), (oldval), (newval))
# define ATOMIC_SIZE_ADD(var, val) __sync_fetch_and_add(&(var), (val))
# define ATOMIC_SIZE_SUB(var, val) __sync_fetch_and_sub(&(var), (val))
# define RUBY_ATOMIC_GENERIC_MACRO 1
#elif defined _WIN32
@ -46,6 +44,8 @@ typedef LONG rb_atomic_t;
# define ATOMIC_SET(var, val) InterlockedExchange(&(var), (val))
# define ATOMIC_INC(var) InterlockedIncrement(&(var))
# define ATOMIC_DEC(var) InterlockedDecrement(&(var))
# define ATOMIC_FETCH_ADD(var, val) InterlockedExchangeAdd(&(var), (val))
# define ATOMIC_FETCH_SUB(var, val) InterlockedExchangeAdd(&(var), -(LONG)(val))
#if defined __GNUC__
# define ATOMIC_OR(var, val) __asm__("lock\n\t" "orl\t%1, %0" : "=m"(var) : "Ir"(val))
#elif MSC_VERSION_BEFORE(1300)
@ -98,13 +98,28 @@ rb_w32_atomic_cas(volatile rb_atomic_t *var, rb_atomic_t oldval, rb_atomic_t new
#include <atomic.h>
typedef unsigned int rb_atomic_t;
# define ATOMIC_SET(var, val) (void)atomic_swap_uint(&(var), (val))
# define ATOMIC_INC(var) atomic_inc_uint(&(var))
# define ATOMIC_DEC(var) atomic_dec_uint(&(var))
# define ATOMIC_FETCH_ADD(var, val) rb_atomic_fetch_add(&(var), (val))
# define ATOMIC_FETCH_SUB(var, val) rb_atomic_fetch_sub(&(var), (val))
# define ATOMIC_ADD(var, val) atomic_add_uint(&(var), (val))
# define ATOMIC_SUB(var, val) atomic_sub_uint(&(var), (val))
# define ATOMIC_OR(var, val) atomic_or_uint(&(var), (val))
# define ATOMIC_EXCHANGE(var, val) atomic_swap_uint(&(var), (val))
# define ATOMIC_CAS(var, oldval, newval) atomic_cas_uint(&(var), (oldval), (newval))
static inline rb_atomic_t
rb_atomic_fetch_add(volatile rb_atomic_t *var, rb_atomic_t val)
{
return atomic_add_int_nv(var, val) - val;
}
static inline rb_atomic_t
rb_atomic_fetch_sub(volatile rb_atomic_t *var, rb_atomic_t val)
{
return atomic_sub_int_nv(var, val) + val;
}
# if defined(_LP64) || defined(_I32LPx)
# define ATOMIC_SIZE_ADD(var, val) atomic_add_long(&(var), (val))
# define ATOMIC_SIZE_SUB(var, val) atomic_add_long(&(var), -(val))
@ -124,6 +139,26 @@ typedef unsigned int rb_atomic_t;
# error No atomic operation found
#endif
#ifndef ATOMIC_SET
# define ATOMIC_SET(var, val) (void)ATOMIC_EXCHANGE(var, val)
#endif
#ifndef ATOMIC_ADD
# define ATOMIC_ADD(var, val) (void)ATOMIC_FETCH_ADD(var, val)
#endif
#ifndef ATOMIC_SUB
# define ATOMIC_SUB(var, val) (void)ATOMIC_FETCH_SUB(var, val)
#endif
#ifndef ATOMIC_INC
# define ATOMIC_INC(var) ATOMIC_ADD(var, 1)
#endif
#ifndef ATOMIC_DEC
# define ATOMIC_DEC(var) ATOMIC_SUB(var, 1)
#endif
#ifndef ATOMIC_SIZE_INC
# define ATOMIC_SIZE_INC(var) ATOMIC_INC(var)
#endif
@ -140,6 +175,14 @@ typedef unsigned int rb_atomic_t;
# define ATOMIC_SIZE_CAS(var, oldval, val) ATOMIC_CAS(var, oldval, val)
#endif
#ifndef ATOMIC_SIZE_ADD
# define ATOMIC_SIZE_ADD(var, val) ATOMIC_ADD(var, val)
#endif
#ifndef ATOMIC_SIZE_SUB
# define ATOMIC_SIZE_SUB(var, val) ATOMIC_SUB(var, val)
#endif
#if RUBY_ATOMIC_GENERIC_MACRO
# ifndef ATOMIC_PTR_EXCHANGE
# define ATOMIC_PTR_EXCHANGE(var, val) ATOMIC_EXCHANGE(var, val)