tree 39a2b7e135c0fd9204e98cefbcb22dec7beda1d1
parent ffe7ae7cb178ccd8ce91b4b51ec4fb3536d1a702
author Wan-Teh Chang <wtc@google.com> 1537476841 -0700
committer Wan-Teh Chang <wtc@google.com> 1537825046 +0000

Improve signaling of pbi->row_mt_cond_.

This CL reduces the thread wakeup overhead of row_mt_worker_hook() and
documents how the bit-stream parsing and decoding of superblocks are
synchronized.

Call pthread_cond_signal(), not pthread_cond_broadcast(), to wake up
only one waiting thread to handle a new superblock decode job.

Note: The code this CL modifies was originally added in
commit 36ff5b12d237d7d6ba95f2478f04df1788dd5b5d;
https://aomedia-review.googlesource.com/c/aom/+/64241

Change-Id: Icdbaea86b5e24fc51724b6bff0d6be9157d27fb4