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gdataset: Use atomic compare and exchange full to set pointers

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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
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11
glib/gdataset.c
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@ -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 --- */