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* ruby_atomic.h: use __atomic builtin functions supported by GCC.

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__sync family are legacy functions now and it is recommended
  that new code use the __atomic functions.
  http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html

* configure.in: check existence of __atomic functions.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43851 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
glass 2013-11-26 02:45:53 +00:00
parent 6295a023a5
commit 0791c940ad
3 changed files with 49 additions and 5 deletions
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20
ruby_atomic.h
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@ -3,6 +3,26 @@
#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_OR(var, val) __atomic_or_fetch(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_EXCHANGE(var, val) __atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_CAS(var, oldval, newval) \
({ __typeof__(__typeof__(var) *) ptr = &(var); /* expression var may have side effects */ \
__typeof__(oldval) oldvaldup = (oldval); /* oldval should not be modified */ \
__typeof__(var) tmp = *ptr; \
__atomic_compare_exchange_n(ptr, &oldvaldup, (newval), 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
tmp; })
# 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 ATOMIC_SIZE_INC(var) __atomic_fetch_add(&(var), 1, __ATOMIC_SEQ_CST)
# define ATOMIC_SIZE_DEC(var) __atomic_fetch_sub(&(var), 1, __ATOMIC_SEQ_CST)
# define ATOMIC_SIZE_EXCHANGE(var, val) __atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
#elif defined HAVE_GCC_SYNC_BUILTINS
/* @shyouhei hack to support atomic operations in case of gcc. Gcc
* has its own pseudo-insns to support them. See info, or
* http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html */