[cairo-bugs] [Bug 98883] BadAccess errors in ShmAttach due to thread races with XNextRequest() usage in cairo-xlib-surface-shm.c

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98883

--- Comment #15 from Karl Tomlinson <bugs.freedesktop at karlt.net> ---
(In reply to Daniel van Vugt from comment #11)
> attachment 139297 [details] [review] mentions multiple times "why" it is
> necessary to make it synchronous. Because it's impossible to detect errors
> in XShmAttach otherwise.

It is not impossible to detect errors without XSync.

Display::async_handlers can be used.  The result would be async and 
the patch comment claims that _cairo_xlib_shm_pool_create must return
a reliable status synchronously.  I haven't check that claim, but if so, I
wonder whether it would be possible to take a fallback path until the pool is
successfully created.

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