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win32: Check and avoid using TLS index 0

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Zero is a valid TLS index so it needs to be checked. It’s also the
integer used to indicate that no TLS has been allocated yet, so it can’t
be used as a TLS identifier.

Incorporates changes from Philip Withnall.

Fixes: #2058
This commit is contained in:
Yongsu Park 2020-05-13 17:29:13 +09:00 committed by Philip Withnall
parent 71edc3ffe1
commit 3364e02041
1 changed files with 11 additions and 1 deletions
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12
glib/gthread-win32.c
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@ -319,7 +319,17 @@ g_private_get_impl (GPrivate *key)
impl = TlsAlloc ();
if (impl == TLS_OUT_OF_INDEXES)
if G_UNLIKELY (impl == 0)
{
/* Ignore TLS index 0 temporarily (as 0 is the indicator that we
* haven't allocated TLS yet) and alloc again;
* See https://gitlab.gnome.org/GNOME/glib/-/issues/2058 */
DWORD impl2 = TlsAlloc ();
TlsFree (impl);
impl = impl2;
}
if (impl == TLS_OUT_OF_INDEXES || impl == 0)
g_thread_abort (0, "TlsAlloc");
if (key->notify != NULL)