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u/time: Implement QPC related functions

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This commit is contained in:
Julian Petrov 2022-04-26 23:06:59 -04:00
parent 3b1e34ee20
commit 1debb2e015
2 changed files with 51 additions and 0 deletions
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24
src/xrt/auxiliary/util/u_time.cpp
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@ -115,3 +115,27 @@ time_state_ts_to_monotonic_ns(struct time_state const *state, timepoint_ns times
return timestamp + state->offset;
}
#ifdef XRT_OS_WINDOWS
extern "C" void
time_state_to_win32perfcounter(struct time_state const *state, timepoint_ns timestamp, LARGE_INTEGER *out_qpc_ticks)
{
assert(state != NULL);
assert(out_qpc_ticks != NULL);
uint64_t ns = time_state_ts_to_monotonic_ns(state, timestamp);
out_qpc_ticks->QuadPart = ns / os_ns_per_qpc_tick_get();
}
extern "C" timepoint_ns
time_state_from_win32perfcounter(struct time_state const *state, const LARGE_INTEGER *qpc_ticks)
{
assert(state != NULL);
assert(qpc_ticks != NULL);
uint64_t ns = qpc_ticks->QuadPart * os_ns_per_qpc_tick_get();
return time_state_monotonic_to_ts_ns(state, ns);
}
#endif // XRT_OS_WINDOWS

27
src/xrt/auxiliary/util/u_time.h
View file

@ -17,9 +17,12 @@
#pragma once
#include "xrt/xrt_compiler.h"
#include <stdint.h>
#include <time.h>
#ifdef __cplusplus
extern "C" {
#endif
@ -285,6 +288,30 @@ time_state_monotonic_to_ts_ns(struct time_state const *state, uint64_t monotonic
uint64_t
time_state_ts_to_monotonic_ns(struct time_state const *state, timepoint_ns timestamp);
#if defined(XRT_OS_WINDOWS) || defined(XRT_DOXYGEN)
/*!
* Converts a timestamp to Win32 "QPC" ticks.
*
* Should not be called simultaneously with time_state_get_now_and_update.
*
* @public @memberof time_state
* @ingroup aux_util
*/
void
time_state_to_win32perfcounter(struct time_state const *state, timepoint_ns timestamp, LARGE_INTEGER *out_qpc_ticks);
/*!
* Converts from Win32 "QPC" ticks to timestamp.
*
* Should not be called simultaneously with time_state_get_now_and_update.
*
* @public @memberof time_state
* @ingroup aux_util
*/
timepoint_ns
time_state_from_win32perfcounter(struct time_state const *state, const LARGE_INTEGER *qpc_ticks);
#endif // defined(XRT_OS_WINDOWS) || defined(XRT_DOXYGEN)
#ifdef __cplusplus
}