pdxx
/
libfastcommon
mirror of https://github.com/happyfish100/libfastcommon.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

add macros FC_ATOMIC_SET_LARGER/SMALLER

pull/37/merge
YuQing 2021-11-10 16:04:42 +08:00
parent 9ca9592326
commit ce2ee0f482
1 changed files with 22 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
src/fc_atomic.h
View File

@ -36,6 +36,7 @@ extern "C" {
old_value = __sync_add_and_fetch(&var, 0); \ old_value = __sync_add_and_fetch(&var, 0); \
} while (new_value != old_value) } while (new_value != old_value)
#define FC_ATOMIC_SET(var, new_value) \ #define FC_ATOMIC_SET(var, new_value) \
do { \ do { \
typeof(var) _old_value; \ typeof(var) _old_value; \
@ -48,6 +49,27 @@ extern "C" {
} while (new_value != _old_value); \ } while (new_value != _old_value); \
} while (0) } while (0)
#define FC_ATOMIC_SET_BY_CONDITION(var, value, skip_operator) \
do { \
typeof(var) old; \
old = __sync_add_and_fetch(&var, 0); \
if (value skip_operator old) { \
break; \
} \
if (__sync_bool_compare_and_swap(&var, old, value)) { \
break; \
} \
} while (1)
#define FC_ATOMIC_SET_LARGER(var, value) \
FC_ATOMIC_SET_BY_CONDITION(var, value, <=)
#define FC_ATOMIC_SET_SMALLER(var, value) \
FC_ATOMIC_SET_BY_CONDITION(var, value, >=)
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif