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gatomic: statically assert that our assumptions hold

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This code assumes that int is exactly 4 bytes, and that pointers
are either 4 or 8 bytes, on platforms with __ATOMIC_SEQ_CST.
In practice this is going to be true.

Bug: https://bugzilla.gnome.org/show_bug.cgi?id=730932
This commit is contained in:
Simon McVittie 2014-07-20 12:39:24 +01:00
parent 19e0cdd7a0
commit 7269d75321
1 changed files with 6 additions and 0 deletions
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6
glib/gatomic.h
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@ -87,6 +87,9 @@ G_END_DECLS
/* We prefer the new C11-style atomic extension of GCC if available */
#if defined(__ATOMIC_SEQ_CST) && !defined(__clang__)
/* We use __atomic_load_4, so we rely on this being true */
G_STATIC_ASSERT (sizeof (gint) == 4);
#define g_atomic_int_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gint)); \
@ -116,6 +119,9 @@ G_END_DECLS
#else /* GLIB_SIZEOF_VOID_P == 8 */
/* Assume that if GLIB_SIZEOF_VOID_P is not 8, it must be 4 */
G_STATIC_ASSERT (sizeof (gpointer) == 4);
#define g_atomic_pointer_get(atomic) \
(G_GNUC_EXTENSION ({ \
G_STATIC_ASSERT (sizeof *(atomic) == sizeof (gpointer)); \