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5a261cfa32
Up until now setting the input and output devices lists is guarded by a mutex. This prevents data races emanating from multiple concurrent calls to avpriv_register_devices() (triggered by multiple concurrent calls to avdevice_register_all()). Yet reading the lists pointers was done without any lock and with nonatomic variables. This means that there are data races in case of concurrent calls to av_(de)muxer_iterate() and avdevice_register_all() (but only if the iteration in av_(de)muxer_iterate exhausts the non-device (de)muxers). This commit fixes this by putting said pointers into atomic objects. Due to the unavailability of _Atomic the object is an atomic_uintptr, leading to ugly casts. Switching to atomics also allowed to remove the mutex currently used in avpriv_register_devices(). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>