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atomic: correct libatomic_ops version of _cairo_atomic_int_cmpxchg

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AO_compare_and_swap_full() doesn't have the same semantic as
_cairo_atomic_int_cmpxchg(). The former returns a TRUE on success
FALSE otherwise while the later returns the atomic value.
This commit is contained in:
Luo Jinghua 2009-10-19 22:21:00 +08:00
parent a2254e5647
commit ea39f0302a
1 changed files with 1 additions and 1 deletions
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src/cairo-atomic-private.h
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@ -91,7 +91,7 @@ typedef AO_t cairo_atomic_int_t;
# define _cairo_atomic_int_inc(x) ((void) AO_fetch_and_add1_full(x))
# define _cairo_atomic_int_dec_and_test(x) (AO_fetch_and_sub1_full(x) == 1)
# define _cairo_atomic_int_cmpxchg(x, oldv, newv) ((cairo_atomic_int_t) AO_compare_and_swap_full(x, oldv, newv))
# define _cairo_atomic_int_cmpxchg(x, oldv, newv) ((cairo_atomic_int_t) AO_compare_and_swap_full(x, oldv, newv) ? oldv : *x)
#if SIZEOF_VOID_P==SIZEOF_INT
typedef unsigned int cairo_atomic_intptr_t;