kotovalexarian-likes-github/ruby--ruby
1
0
Fork 0
mirror of https://github.com/ruby/ruby.git synced 2022-11-09 12:17:21 -05:00
Code Releases Activity

ruby_atomic.h: ATOMIC_PTR_EXCHANGE

Browse source 
* ruby_atomic.h (ATOMIC_PTR_EXCHANGE): atomic exchange function for
  a generic pointer.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43996 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2013-12-05 01:48:10 +00:00
parent b8434daf6b
commit fb29aefc7a
2 changed files with 15 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

10
ruby_atomic.h
View file

@ -17,6 +17,8 @@ typedef unsigned int rb_atomic_t;
# define ATOMIC_SIZE_ADD(var, val) __atomic_fetch_add(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_SIZE_SUB(var, val) __atomic_fetch_sub(&(var), (val), __ATOMIC_SEQ_CST)
# define ATOMIC_PTR_EXCHANGE(var, val) __atomic_exchange_n(&(var), (val), __ATOMIC_SEQ_CST)
#elif defined HAVE_GCC_SYNC_BUILTINS
/* @shyouhei hack to support atomic operations in case of gcc. Gcc
* has its own pseudo-insns to support them. See info, or
@ -33,6 +35,8 @@ typedef unsigned int rb_atomic_t; /* Anything OK */
# define ATOMIC_SIZE_ADD(var, val) __sync_fetch_and_add(&(var), (val))
# define ATOMIC_SIZE_SUB(var, val) __sync_fetch_and_sub(&(var), (val))
# define ATOMIC_PTR_EXCHANGE(var, val) __sync_lock_test_and_set(&(var), (val))
#elif defined _WIN32
#if defined _MSC_VER && _MSC_VER > 1200
#pragma intrinsic(_InterlockedOr)
@ -152,4 +156,10 @@ atomic_size_exchange(size_t *ptr, size_t val)
# define ATOMIC_SIZE_CAS(var, oldval, val) ATOMIC_CAS(var, oldval, val)
#endif
#ifndef ATOMIC_PTR_EXCHANGE
# if SIZEOF_VOIDP == SIZEOF_SIZE_T
# define ATOMIC_PTR_EXCHANGE(var, val) (void *)ATOMIC_SIZE_EXCHANGE(*(size_t *)&(var), (size_t)(val))
# endif
#endif
#endif /* RUBY_ATOMIC_H */