Add multi-threading support in OpenFX#1247
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Pull request overview
Adds OpenFX host-side multi-threading support by wiring the OFX OfxMultiThreadSuiteV1 callbacks to MLT’s slice threading (mlt_slices_*) and implementing OFX mutex primitives using pthreads, with thread-local tracking for multiThreadIndex() / multiThreadIsSpawnedThread().
Changes:
- Implemented
multiThread()usingmlt_slices_run_normal()and introduced TLS state for thread index/spawned-thread queries. - Implemented OFX mutex create/lock/unlock/trylock/destroy using
pthread_mutex_t(recursive). - Updated
multiThreadNumCPUs()to report MLT’s slice count.
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