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[common] time: fully implement all functionality for windows

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We implement nanotime by converting QueryPerformanceTimer output with
floating point arithmetic. This is necessary to preserve precision on
platforms where each tick is not an integer number of nanoseconds.

Furthermore, struct timespec is included C11 and appears to be supported
on Windows, so we no longer need to #ifdef it out.
This commit is contained in:
Quantum 2021-07-28 01:21:48 -04:00 committed by Geoffrey McRae
parent 009ae02e32
commit 996b9e7e7b
1 changed files with 15 additions and 7 deletions
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22
common/include/common/time.h
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@ -22,6 +22,7 @@
#include <stdint.h>
#include <stdbool.h>
#include <time.h>
#if defined(_WIN32)
#include <windows.h>
@ -31,10 +32,6 @@ NTSYSCALLAPI NTSTATUS NTAPI NtDelayExecution(
_In_ BOOLEAN Alertable,
_In_opt_ PLARGE_INTEGER DelayInterval
);
#else
#include <time.h>
#include <stdint.h>
#endif
typedef struct LGTimer LGTimer;
@ -71,13 +68,25 @@ static inline void nsleep(uint64_t ns)
#endif
}
#if !defined(_WIN32)
//FIXME: make win32 versions
static inline uint64_t nanotime(void)
{
#if defined(_WIN32)
static double multiplier = 0.0;
if (!multiplier)
{
LARGE_INTEGER freq = { 0 };
QueryPerformanceFrequency(&freq);
multiplier = 1e9 / freq.QuadPart;
}
LARGE_INTEGER time;
QueryPerformanceCounter(&time);
return (uint64_t) (time.QuadPart * multiplier);
#else
struct timespec time;
clock_gettime(CLOCK_MONOTONIC_RAW, &time);
return ((uint64_t)time.tv_sec * 1000000000LL) + time.tv_nsec;
#endif
}
static inline void tsDiff(struct timespec *diff, const struct timespec *left,
@ -115,7 +124,6 @@ static inline void tsAdd(struct timespec *a, uint64_t ns)
a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, 1000000000L, &ns);
a->tv_nsec = ns;
}
#endif
typedef bool (*LGTimerFn)(void * udata);