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| author | Peter Crosthwaite <peter.crosthwaite@xilinx.com> | 2013-04-16 10:27:16 +1000 |
|---|---|---|
| committer | Edgar E. Iglesias <edgar.iglesias@gmail.com> | 2013-04-16 10:04:23 +0200 |
| commit | 35e60bfdbc14ce31bba55cc82144f8a2a82ede68 (patch) | |
| tree | 2e9d9523edd263fc325a819ad6aba7d78edc4c59 /hw/core | |
| parent | 210914e29975d17e635f9e8c1f7478c0ed7a208f (diff) | |
| download | qemu-35e60bfdbc14ce31bba55cc82144f8a2a82ede68.tar.gz | |
stream: Add flow control API
Add basic flow control to stream. A stream slave may return short, indicating
that it is not capable of accepting any more data at the present time. Polling
or a callback can be used via the can_push() function to determine when the
slave can receive again.
Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Diffstat (limited to 'hw/core')
| -rw-r--r-- | hw/core/stream.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/hw/core/stream.c b/hw/core/stream.c index a07d6a56d3..5397a8d74a 100644 --- a/hw/core/stream.c +++ b/hw/core/stream.c @@ -1,11 +1,20 @@ #include "hw/stream.h" -void +size_t stream_push(StreamSlave *sink, uint8_t *buf, size_t len, uint32_t *app) { StreamSlaveClass *k = STREAM_SLAVE_GET_CLASS(sink); - k->push(sink, buf, len, app); + return k->push(sink, buf, len, app); +} + +bool +stream_can_push(StreamSlave *sink, StreamCanPushNotifyFn notify, + void *notify_opaque) +{ + StreamSlaveClass *k = STREAM_SLAVE_GET_CLASS(sink); + + return k->can_push ? k->can_push(sink, notify, notify_opaque) : true; } static const TypeInfo stream_slave_info = { |