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GLsync objects had a race condition when used from multiple threads (which is the main point of the extension, really); it could be validated as a sync object at the beginning of the function, and then deleted by another thread before use, causing crashes. Fix this by changing all casts from GLsync to struct gl_sync_object to a new function _mesa_get_and_ref_sync() that validates and increases the refcount. In a similar vein, validation itself uses _mesa_set_search(), which requires synchronization -- it was called without a mutex held, causing spurious error returns and other issues. Since _mesa_get_and_ref_sync() now takes the shared context mutex, this problem is also resolved. Fixes bug #92757, found while developing Nageru, my live video mixer (due for release at FOSDEM 2016). v2: Marek: silence warnings, fix declaration after code Signed-off-by: Steinar H. Gunderson <sesse@google.com> Cc: "11.0 11.1" <mesa-stable@lists.freedesktop.org> Signed-off-by: Marek Olšák <marek.olsak@amd.com>
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