diff options
| author | Glenn Kasten <gkasten@google.com> | 2013-06-24 12:06:46 -0700 |
|---|---|---|
| committer | Glenn Kasten <gkasten@google.com> | 2013-06-24 13:34:08 -0700 |
| commit | 0d09a9bec07b3bec78bd473ff0bfcf0a261f3f25 (patch) | |
| tree | 410d8c22e5d15f9143d04212cd96939c217cacc5 /include/private | |
| parent | a2cf13c77260f98fc674f103dcbd2bb2488a80ce (diff) | |
| download | frameworks_av-0d09a9bec07b3bec78bd473ff0bfcf0a261f3f25.zip frameworks_av-0d09a9bec07b3bec78bd473ff0bfcf0a261f3f25.tar.gz frameworks_av-0d09a9bec07b3bec78bd473ff0bfcf0a261f3f25.tar.bz2 | |
Use mFutex as an event flag rather than semaphore
An event flag can be more fault-tolerant in case of loss of synchronization,
as it cannot overflow. It also allows more bits to be used in the future.
See http://en.wikipedia.org/wiki/Event_flag
Change-Id: I01ca25d951eb263124da54bb4738f0d94ec4a48b
Diffstat (limited to 'include/private')
| -rw-r--r-- | include/private/media/AudioTrackShared.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/private/media/AudioTrackShared.h b/include/private/media/AudioTrackShared.h index 681f557..ef5bb8d 100644 --- a/include/private/media/AudioTrackShared.h +++ b/include/private/media/AudioTrackShared.h @@ -94,8 +94,9 @@ struct audio_track_cblk_t // parameter // renamed to "_" to detect incorrect use - volatile int32_t mFutex; // semaphore: down (P) by client, + volatile int32_t mFutex; // event flag: down (P) by client, // up (V) by server or binderDied() or interrupt() +#define CBLK_FUTEX_WAKE 1 // if event flag bit is set, then a deferred wake is pending private: |