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When handling elements that spawn multiple threads (hardware enc/decoders), the pad monitor has to protect its variables specially because some checks involve iterating over internally linked pads to add/get some data for comparison (expected events, timestamp ranges, caps). Aside from locking its own mutex, the pad monitor can also lock the parent's mutex when it needs to use data from its internally linked pads. The locking order should always be parent and then individual pad-monitor mutexes. This should prevent deadlocks when multiple pad-monitors from the same element start doing checks at the same time from different threads. |
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