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* 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
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3 changed files with 49 additions and 5 deletions
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@ -1,3 +1,12 @@
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Tue Nov 26 11:43:19 2013 Masaki Matsushita <glass.saga@gmail.com>
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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
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that new code use the __atomic functions.
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http://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html
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* configure.in: check existence of __atomic functions.
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Tue Nov 26 10:57:49 2013 Nobuyoshi Nakada <nobu@ruby-lang.org>
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* ext/bigdecimal/bigdecimal.gemspec: revert Gem::Specification#date
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25
configure.in
25
configure.in
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@ -1480,7 +1480,22 @@ if test "$GCC" = yes; then
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AC_DEFINE_UNQUOTED([RUBY_ALIAS_FUNCTION_VOID(prot, name, args)],
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[RUBY_ALIAS_FUNCTION_TYPE(void, prot, name, args)])
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fi
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AC_CACHE_CHECK([for atomic builtins], [rb_cv_gcc_atomic_builtins], [
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AC_CACHE_CHECK([for __atomic builtins], [rb_cv_gcc_atomic_builtins], [
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AC_TRY_LINK([unsigned char atomic_var;],
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[
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__atomic_exchange_n(&atomic_var, 0, __ATOMIC_SEQ_CST);
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__atomic_exchange_n(&atomic_var, 1, __ATOMIC_SEQ_CST);
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__atomic_fetch_add(&atomic_var, 1, __ATOMIC_SEQ_CST);
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__atomic_fetch_sub(&atomic_var, 1, __ATOMIC_SEQ_CST);
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],
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[rb_cv_gcc_atomic_builtins=yes],
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[rb_cv_gcc_atomic_builtins=no])])
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if test "$rb_cv_gcc_atomic_builtins" = yes; then
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AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS)
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fi
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AC_CACHE_CHECK([for __sync builtins], [rb_cv_gcc_sync_builtins], [
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AC_TRY_LINK([unsigned char atomic_var;],
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[
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__sync_lock_test_and_set(&atomic_var, 0);
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@ -1488,10 +1503,10 @@ if test "$GCC" = yes; then
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__sync_fetch_and_add(&atomic_var, 1);
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__sync_fetch_and_sub(&atomic_var, 1);
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],
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[rb_cv_gcc_atomic_builtins=yes],
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[rb_cv_gcc_atomic_builtins=no])])
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if test "$rb_cv_gcc_atomic_builtins" = yes; then
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AC_DEFINE(HAVE_GCC_ATOMIC_BUILTINS)
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[rb_cv_gcc_sync_builtins=yes],
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[rb_cv_gcc_sync_builtins=no])])
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if test "$rb_cv_gcc_sync_builtins" = yes; then
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AC_DEFINE(HAVE_GCC_SYNC_BUILTINS)
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fi
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AC_CACHE_CHECK(for __builtin_unreachable, rb_cv_func___builtin_unreachable,
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@ -3,6 +3,26 @@
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#if 0
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#elif defined HAVE_GCC_ATOMIC_BUILTINS
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typedef unsigned int rb_atomic_t;
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# define ATOMIC_SET(var, val) (void)__atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
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# define ATOMIC_INC(var) __atomic_fetch_add(&(var), 1, __ATOMIC_SEQ_CST)
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# define ATOMIC_DEC(var) __atomic_fetch_sub(&(var), 1, __ATOMIC_SEQ_CST)
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# define ATOMIC_OR(var, val) __atomic_or_fetch(&(var), (val), __ATOMIC_SEQ_CST)
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# define ATOMIC_EXCHANGE(var, val) __atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
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# define ATOMIC_CAS(var, oldval, newval) \
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({ __typeof__(__typeof__(var) *) ptr = &(var); /* expression var may have side effects */ \
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__typeof__(oldval) oldvaldup = (oldval); /* oldval should not be modified */ \
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__typeof__(var) tmp = *ptr; \
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__atomic_compare_exchange_n(ptr, &oldvaldup, (newval), 0, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST); \
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tmp; })
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# define ATOMIC_SIZE_ADD(var, val) __atomic_fetch_add(&(var), (val), __ATOMIC_SEQ_CST)
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# define ATOMIC_SIZE_SUB(var, val) __atomic_fetch_sub(&(var), (val), __ATOMIC_SEQ_CST)
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# define ATOMIC_SIZE_INC(var) __atomic_fetch_add(&(var), 1, __ATOMIC_SEQ_CST)
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# define ATOMIC_SIZE_DEC(var) __atomic_fetch_sub(&(var), 1, __ATOMIC_SEQ_CST)
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# define ATOMIC_SIZE_EXCHANGE(var, val) __atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
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#elif defined HAVE_GCC_SYNC_BUILTINS
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/* @shyouhei hack to support atomic operations in case of gcc. Gcc
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* has its own pseudo-insns to support them. See info, or
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* http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html */
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