diff options
| author |  Stefan Richter
| 2012-06-18 01:19:54 +0200 |
|---|---|---|
| committer | Stefan Richter
| 2012-06-18 01:53:32 +0200 |
| commit | 5b4cffe9d7b515d807874da48c6a149edc37a99b (patch) | |
| tree | 07aa5bc3df3617e8caeaae59ba2f68fa35e0619e /doc | |
| parent | Tweak raw1394_add_config_rom_descriptor() API, add documentation and test case (diff) | |
Add raw1394_read_cycle_timer_and_clock() API
This is an extension relative to raw1394_read_cycle_timer().
It lets the client choose a system clock other than CLOCK_REALTIME.
Use case: http://subversion.ffado.org/ticket/242
The underlying ioctl supports reading the system clock with nanoseconds
resolution. The new libraw1394 call sticks with microseconds resolution
though. This makes transition from (or parallel use with)
raw1394_read_cycle_timer() easier. Besides, the call itself takes longer
than a microsecond, primarily due to a costly MMIO read (on many
controllers even three or more MMIO reads).
Unit tests with CLOCK_MONOTONIC and CLOCK_MONOTONIC_RAW are added to
testlibraw as well.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'doc')
0 files changed, 0 insertions, 0 deletions