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| author | Torvald Riegel <triegel@redhat.com> | 2016-07-21 14:31:28 +0200 |
|---|---|---|
| committer | Torvald Riegel <triegel@redhat.com> | 2016-08-05 16:06:22 +0200 |
| commit | f0e3925bf3b8df6940c3346db17e42615979d458 (patch) | |
| tree | 02a07de8dac49709b74b29c7d05490e3c56eeafd | |
| parent | cb864fe0ecb52bff2961bfaffd5823a49bfdff01 (diff) | |
| download | glibc-f0e3925bf3b8df6940c3346db17e42615979d458.tar.gz glibc-f0e3925bf3b8df6940c3346db17e42615979d458.tar.xz glibc-f0e3925bf3b8df6940c3346db17e42615979d458.zip | |
Add atomic_exchange_relaxed.
* include/atomic.h (atomic_exchange_relaxed): New.
| -rw-r--r-- | ChangeLog | 4 | ||||
| -rw-r--r-- | include/atomic.h | 9 |
2 files changed, 13 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog index 1e63a386fe..205da062e6 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,7 @@ +2016-08-05 Torvald Riegel <triegel@redhat.com> + + * include/atomic.h (atomic_exchange_relaxed): New. + 2016-08-04 Joseph Myers <joseph@codesourcery.com> * math/e_scalb.c: Do not include <fenv.h>. diff --git a/include/atomic.h b/include/atomic.h index ad3db2562e..129ee24426 100644 --- a/include/atomic.h +++ b/include/atomic.h @@ -588,6 +588,9 @@ void __atomic_link_error (void); __atomic_compare_exchange_n ((mem), (expected), (desired), 1, \ __ATOMIC_RELEASE, __ATOMIC_RELAXED); }) +# define atomic_exchange_relaxed(mem, desired) \ + ({ __atomic_check_size((mem)); \ + __atomic_exchange_n ((mem), (desired), __ATOMIC_RELAXED); }) # define atomic_exchange_acquire(mem, desired) \ ({ __atomic_check_size((mem)); \ __atomic_exchange_n ((mem), (desired), __ATOMIC_ACQUIRE); }) @@ -684,6 +687,12 @@ void __atomic_link_error (void); *(expected) == __atg103_expected; }) # endif +/* XXX Fall back to acquire MO because archs do not define a weaker + atomic_exchange. */ +# ifndef atomic_exchange_relaxed +# define atomic_exchange_relaxed(mem, val) \ + atomic_exchange_acq ((mem), (val)) +# endif # ifndef atomic_exchange_acquire # define atomic_exchange_acquire(mem, val) \ atomic_exchange_acq ((mem), (val)) |