From 0791c940ad9c4749e72accb91c7e22e684fde668 Mon Sep 17 00:00:00 2001 From: glass Date: Tue, 26 Nov 2013 02:45:53 +0000 Subject: * ruby_atomic.h: use __atomic builtin functions supported by GCC. __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 --- ruby_atomic.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'ruby_atomic.h') diff --git a/ruby_atomic.h b/ruby_atomic.h index 7e16d287f8..091a608011 100644 --- a/ruby_atomic.h +++ b/ruby_atomic.h @@ -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 */ -- cgit v1.2.3