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| author | Maxim Kuvyrkov <maxim@codesourcery.com> | 2012-08-13 19:31:00 -0700 |
|---|---|---|
| committer | Maxim Kuvyrkov <maxim@codesourcery.com> | 2012-08-13 19:31:00 -0700 |
| commit | 51a9ba860ae3305d475f43f568e8fa51b8a53b6e (patch) | |
| tree | 77e13975116d3ca0e7c98c2ec01a63a47988f221 | |
| parent | cc184e11fe3d3624c0ff622e018abc608346a342 (diff) | |
| download | glibc-51a9ba860ae3305d475f43f568e8fa51b8a53b6e.tar.gz glibc-51a9ba860ae3305d475f43f568e8fa51b8a53b6e.tar.xz glibc-51a9ba860ae3305d475f43f568e8fa51b8a53b6e.zip | |
Add explicit acquire/release semantics to atomic_exchange_and_add.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | include/atomic.h | 18 |
2 files changed, 22 insertions, 2 deletions
diff --git a/ChangeLog b/ChangeLog index 0377ac9b03..2adf44c736 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,9 @@ +2012-08-13 Maxim Kuvyrkov <maxim@codesourcery.com> + + * include/atomic.h (atomic_exchange_and_add): Split into ... + (atomic_exchange_and_add_acq, atomic_exchange_and_add_rel): ... these. + New atomic macros. + 2012-08-13 Markus Trippelsdorf <markus@trippelsdorf.de> * sysdeps/x86_64/fpu/libm-test-ulps: Update. diff --git a/include/atomic.h b/include/atomic.h index 3ccb46d9ed..bc20772f2b 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -198,8 +198,12 @@ /* Add VALUE to *MEM and return the old value of *MEM. */ -#ifndef atomic_exchange_and_add -# define atomic_exchange_and_add(mem, value) \ +#ifndef atomic_exchange_and_add_acq +# ifdef atomic_exchange_and_add +# define atomic_exchange_and_add_acq(mem, value) \ + atomic_exchange_and_add (mem, value) +# else +# define atomic_exchange_and_add_acq(mem, value) \ ({ __typeof (*(mem)) __atg6_oldval; \ __typeof (mem) __atg6_memp = (mem); \ __typeof (*(mem)) __atg6_value = (value); \ @@ -213,8 +217,18 @@ __atg6_oldval), 0)); \ \ __atg6_oldval; }) +# endif #endif +#ifndef atomic_exchange_and_add_rel +# define atomic_exchange_and_add_rel(mem, value) \ + atomic_exchange_and_add_acq(mem, value) +#endif + +#ifndef atomic_exchange_and_add +# define atomic_exchange_and_add(mem, value) \ + atomic_exchange_and_add_acq(mem, value) +#endif #ifndef catomic_exchange_and_add # define catomic_exchange_and_add(mem, value) \ |