mirrors/monado
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/monado/monado.git synced 2024-12-29 11:06:18 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

a/os: Add QPC helper for getting win32 ticks

Browse source
This commit is contained in:
Julian Petrov 2022-04-26 23:06:59 -04:00
parent 3e87f9831d
commit 3b1e34ee20
1 changed files with 25 additions and 8 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

33
src/xrt/auxiliary/os/os_time.h
View file

@ -155,6 +155,16 @@ static inline uint64_t
os_realtime_get_ns(void);
#endif
#if defined(XRT_OS_WINDOWS) || defined(XRT_DOXYGEN)
/*!
* @brief Return a qpc freq in nanoseconds.
* @ingroup aux_os_time
*/
static inline int64_t
os_ns_per_qpc_tick_get();
#endif
/*
*
* implementations follow
@ -254,6 +264,20 @@ os_timeval_to_ns(struct timeval *val)
}
#endif // defined(XRT_HAVE_TIMEVAL) && defined(XRT_OS_LINUX)
#if defined(XRT_OS_WINDOWS)
static inline int64_t
os_ns_per_qpc_tick_get()
{
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;
}
return ns_per_qpc_tick;
}
#endif // defined(XRT_OS_WINDOWS)
static inline uint64_t
os_monotonic_get_ns(void)
@ -267,16 +291,9 @@ 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;
return qpc.QuadPart * os_ns_per_qpc_tick_get();
#else
#error "need port"
#endif