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| -rw-r--r-- | ChangeLog | 11 | ||||
| -rw-r--r-- | signal.c | 11 |
2 files changed, 22 insertions, 0 deletions
@@ -1,3 +1,14 @@ +Mon Oct 25 16:38:07 2010 URABE Shyouhei <shyouhei@ruby-lang.org> + + * signal.c (rb_atomic_t): GCC (of at least recent versions) + has ubiquitos support for atomic operations. On that + compiler a C program can isse a memory barrier using these + dedicated instructions. According to the GCC manual they + cargo culted this feature form the Itanium ABI so chances + are that other compilers could also support this feature. + But so far GCC is the only compiler that I know to have it. + Also note that this works on non-Itanium machines. + Mon Oct 25 06:21:35 2010 Nobuyoshi Nakada <nobu@ruby-lang.org> * vsnprintf.c (BSD_vfprintf): prec digits fractal part should be @@ -25,6 +25,17 @@ typedef LONG rb_atomic_t; # define ATOMIC_INC(var) InterlockedIncrement(&(var)) # define ATOMIC_DEC(var) InterlockedDecrement(&(var)) +#elsif __GNUC__ >= 4 +/* @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 */ + +typedef unsigned char rb_atomic_t; /* Anything OK */ +# define ATOMIC_TEST(var) __sync_lock_test_and_set(&(var), 0) +# define ATOMIC_SET(var, val) __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) + #else typedef int rb_atomic_t; |