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 /src/dispatch.c | |
| 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 'src/dispatch.c')
| -rw-r--r-- | src/dispatch.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/dispatch.c b/src/dispatch.c index 601ee78..55d8327 100644 --- a/src/dispatch.c +++ b/src/dispatch.c @@ -791,3 +791,19 @@ int raw1394_read_cycle_timer(raw1394handle_t handle, return ieee1394_read_cycle_timer(handle->mode.ieee1394, cycle_timer, local_time); } + +int raw1394_read_cycle_timer_and_clock(raw1394handle_t handle, + u_int32_t *cycle_timer, u_int64_t *local_time, clockid_t clk_id) +{ + if (!handle) { + errno = EINVAL; + return -1; + } + if (handle->is_fw) + return fw_read_cycle_timer_and_clock(handle->mode.fw, + cycle_timer, local_time, clk_id); + else { + errno = ENOSYS; + return -1; + } +} |