pthread: Avoid crashes/odd behavior caused by spurious wakeups
pthread_wait_cond can wake up for no reason (Wikipedia: Spurious_wakeup). The FF_THREAD_SLICE thread mechanism could spontaneously execute jobs or allow the caller of avctx->execute to return before all jobs were complete. This adds tests to both cases to ensure the wakeup is real. Signed-off-by:Ben Jackson <ben@ben.com> Signed-off-by:
Michael Niedermayer <michaelni@gmx.at>
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