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atomic: Fix type check of g_atomic_pointer_compare_and_exchange()

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This commit is contained in:
Xavier Claessens 2021-02-02 13:17:33 -05:00
parent 7459bf9a19
commit 580b415ebd
1 changed files with 11 additions and 3 deletions
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14
glib/gatomic.h
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@ -183,16 +183,24 @@ G_END_DECLS
(guint) __atomic_fetch_xor ((atomic), (val), __ATOMIC_SEQ_CST); \
}))
#if defined(glib_typeof)
#if defined(glib_typeof) && defined(__cplusplus) && __cplusplus >= 201103L
/* This is typesafe because we check we can assign oldval to the type of
* (*atomic). Unfortunately it can only be done in C++ because gcc/clang warn
* when atomic is volatile and not oldval, or when atomic is gsize* and oldval
* is NULL. Note that clang++ force us to be typesafe because it is an error if the 2nd
* argument of __atomic_compare_exchange_n() has a different type than the
* first.
* https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1919
* https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1715#note_1024120. */
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof (oldval) == sizeof (gpointer)); \
glib_typeof ((oldval)) gapcae_oldval = (oldval); \
glib_typeof (*(atomic)) gapcae_oldval = (oldval); \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \
(void) (0 ? (gpointer) *(atomic) : NULL); \
__atomic_compare_exchange_n ((atomic), &gapcae_oldval, (newval), FALSE, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST) ? TRUE : FALSE; \
}))
#else /* if !defined(glib_typeof) */
#else /* if !(defined(glib_typeof) && defined(__cplusplus) && __cplusplus >= 201103L) */
#define g_atomic_pointer_compare_and_exchange(atomic, oldval, newval) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof (oldval) == sizeof (gpointer)); \