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os: Improve timestamp retrieval on Windows.

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This commit is contained in:
Ryan Pavlik 2021-03-30 11:19:41 -05:00
parent 00915cab0f
commit 0717975853
1 changed files with 14 additions and 23 deletions
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37
src/xrt/auxiliary/os/os_time.h
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@ -126,28 +126,6 @@ os_timeval_to_ns(struct timeval *val)
}
#endif // XRT_HAVE_TIMEVAL
#ifdef XRT_OS_WINDOWS
#define CLOCK_MONOTONIC 0
#define CLOCK_REALTIME 1
static int
clock_gettime(int clk_id, struct timespec *spec)
{
__int64 wintime;
//! @todo We should be using QueryPerformanceCounter
GetSystemTimeAsFileTime((FILETIME *)&wintime);
// 1jan1601 to 1jan1970
wintime -= 116444736000000000i64;
// seconds
spec->tv_sec = wintime / 10000000i64;
// nano-seconds
spec->tv_nsec = wintime % 10000000i64 * 100;
return 0;
}
#endif // XRT_OS_WINDOWS
/*!
* @brief Return a monotonic clock in nanoseconds.
* @ingroup aux_os_time
@ -155,7 +133,7 @@ clock_gettime(int clk_id, struct timespec *spec)
static inline uint64_t
os_monotonic_get_ns(void)
{
#if defined(XRT_OS_LINUX) || defined(XRT_OS_WINDOWS)
#if defined(XRT_OS_LINUX)
struct timespec ts;
int ret = clock_gettime(CLOCK_MONOTONIC, &ts);
if (ret != 0) {
@ -163,6 +141,19 @@ os_monotonic_get_ns(void)
}
return os_timespec_to_ns(&ts);
#elif defined(XRT_OS_WINDOWS)
static int64_t ns_per_qpc_tick = 0;
if (ns_per_qpc_tick == 0) {
// Fixed at startup, so we can cache this.
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
ns_per_qpc_tick = U_1_000_000_000 / freq.QuadPart;
}
LARGE_INTEGER qpc;
QueryPerformanceCounter(&qpc);
return qpc.QuadPart * ns_per_qpc_tick;
#else
#error "need port"
#endif
}