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/fw.h | |
| 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/fw.h')
| -rw-r--r-- | src/fw.h | 6 |
1 files changed, 4 insertions, 2 deletions
@@ -251,7 +251,9 @@ int fw_iso_recv_unlisten_channel(fw_handle_t handle, int fw_iso_recv_set_channel_mask(fw_handle_t handle, u_int64_t mask); void fw_iso_stop(fw_handle_t handle); void fw_iso_shutdown(fw_handle_t handle); -int fw_read_cycle_timer(fw_handle_t handle, - u_int32_t *cycle_timer, u_int64_t *local_time); +int fw_read_cycle_timer(fw_handle_t handle, u_int32_t *cycle_timer, + u_int64_t *local_time); +int fw_read_cycle_timer_and_clock(fw_handle_t handle, u_int32_t *cycle_timer, + u_int64_t *local_time, clockid_t clk_id); #endif |