diff options
| author | Andrew W. Nosenko <andrew.w.nosenko@gmail.com> | 2012-04-26 17:02:56 +0300 |
|---|---|---|
| committer | Martin Sustrik <sustrik@250bpm.com> | 2012-04-29 07:30:37 +0200 |
| commit | cdbaa67ff5fdb7cebab670e6f7906d9e81ae7f0a (patch) | |
| tree | e7b925bf24ecf966577c06333cb22f7e1b208f6d /src/atomic_ptr.hpp | |
| parent | 98d4e212bc6379888c006aadb89eb1b96e0b3ddb (diff) | |
atomic: prefer GCC __sync_*() builtins over inline asm
Use GCC __sync_*() builtins when compiler claims to be GCC (GCC itself,
Clang...)
It can be disabled explicitly by using XS_DISABLE_GCC_SYNC_BUILTINS
define. Just for any case.
* src/atomic_counter.hpp [__GNUC__ && !XS_DISABLE_GCC_SYNC_BUILTINS]:
(atomic_counter_t::add):
(atomic_counter_t::sub):
* src/atomic_ptr.hpp [__GNUC__ && !XS_DISABLE_GCC_SYNC_BUILTINS]:
(atomic_ptr_t::xchg):
(atomic_ptr_t::cas):
Prefer GCC __sync_*() builtins over inline asm.
Diffstat (limited to 'src/atomic_ptr.hpp')
| -rw-r--r-- | src/atomic_ptr.hpp | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/atomic_ptr.hpp b/src/atomic_ptr.hpp index 8d4c770..2e585b7 100644 --- a/src/atomic_ptr.hpp +++ b/src/atomic_ptr.hpp @@ -82,6 +82,15 @@ namespace xs { #if defined XS_ATOMIC_PTR_WINDOWS return (T*) InterlockedExchangePointer ((PVOID*) &ptr, val_); +#elif defined __GNUC__ && !defined XS_DISABLE_GCC_SYNC_BUILTINS + { + T* ov; + do + { + ov = const_cast<T*>(ptr); + } while (!__sync_bool_compare_and_swap (&ptr, ov, val_)); + return ov; + } #elif defined XS_ATOMIC_PTR_ATOMIC_H return (T*) atomic_swap_ptr (&ptr, val_); #elif defined XS_ATOMIC_PTR_X86 @@ -125,6 +134,8 @@ namespace xs #if defined XS_ATOMIC_PTR_WINDOWS return (T*) InterlockedCompareExchangePointer ( (volatile PVOID*) &ptr, val_, cmp_); +#elif defined __GNUC__ && !defined XS_DISABLE_GCC_SYNC_BUILTINS + return (T*) __sync_val_compare_and_swap (&ptr, cmp_, val_); #elif defined XS_ATOMIC_PTR_ATOMIC_H return (T*) atomic_cas_ptr (&ptr, cmp_, val_); #elif defined XS_ATOMIC_PTR_X86 |