luc14n0/glib
1
0
Fork 0
mirror of https://gitlab.gnome.org/GNOME/glib.git synced 2024-09-20 01:06:15 +02:00
Code Issues Packages Projects Releases Wiki Activity

gdataset: Use atomic compare and exchange full to set pointers

Browse Source 
In case first exchange failed we can avoid repeating the pointer get
operation given that exchange full can provide us the old value.
This commit is contained in:
Marco Trevisan (Treviño) 2023-05-09 14:06:21 +02:00
parent 08aee6b5f4
commit e54f27322d
1 changed files with 6 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
glib/gdataset.c
View File

@ -144,12 +144,13 @@
#define G_DATALIST_GET_POINTER(datalist) \
((GData*) ((gsize) g_atomic_pointer_get (datalist) & ~(gsize) G_DATALIST_FLAGS_MASK_INTERNAL))
#define G_DATALIST_SET_POINTER(datalist, pointer) G_STMT_START { \
gpointer _oldv, _newv; \
do { \
_oldv = g_atomic_pointer_get (datalist); \
#define G_DATALIST_SET_POINTER(datalist, pointer) G_STMT_START { \
gpointer _oldv = g_atomic_pointer_get (datalist); \
gpointer _newv; \
do { \
_newv = (gpointer) (((gsize) _oldv & G_DATALIST_FLAGS_MASK_INTERNAL) | (gsize) pointer); \
} while (!g_atomic_pointer_compare_and_exchange ((void**) datalist, _oldv, _newv)); \
} while (!g_atomic_pointer_compare_and_exchange_full ((void**) datalist, _oldv, \
_newv, &_oldv)); \
} G_STMT_END
/* --- structures --- */