Merge remote-tracking branch 'psnip_clock/master'

This commit is contained in:
Connor Olding 2018-10-11 16:45:35 +02:00
commit 2c226e0ec8

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/* Clocks (v1)
* Portable Snippets - https://github.com/nemequ/portable-snippets
* Created by Evan Nemerson <evan@nemerson.com>
*
* To the extent possible under law, the authors have waived all
* copyright and related or neighboring rights to this code. For
* details, see the Creative Commons Zero 1.0 Universal license at
* https://creativecommons.org/publicdomain/zero/1.0/
*
* Modified by Connor Olding, 2017
*/
#if !defined(PSNIP_CLOCK_H)
#define PSNIP_CLOCK_H
#if !defined(PSNIP_CLOCK_STATIC_INLINE)
# if defined(__GNUC__)
# define PSNIP_CLOCK__COMPILER_ATTRIBUTES __attribute__((__unused__))
# else
# define PSNIP_CLOCK__COMPILER_ATTRIBUTES
# endif
# define PSNIP_CLOCK__FUNCTION PSNIP_CLOCK__COMPILER_ATTRIBUTES static
#endif
enum PsnipClockType {
/* This clock provides the current time, in units since 1970-01-01
* 00:00:00 UTC not including leap seconds. In other words, UNIX
* time. Keep in mind that this clock doesn't account for leap
* seconds, and can go backwards (think NTP adjustments). */
PSNIP_CLOCK_TYPE_WALL = 1,
/* The CPU time is a clock which increases only when the current
* process is active (i.e., it doesn't increment while blocking on
* I/O). */
PSNIP_CLOCK_TYPE_CPU = 2,
/* Monotonic time is always running (unlike CPU time), but it only
ever moves forward unless you reboot the system. Things like NTP
adjustments have no effect on this clock. */
PSNIP_CLOCK_TYPE_MONOTONIC = 3
};
struct PsnipClockTimespec {
uint64_t seconds;
uint64_t nanoseconds;
};
/* Methods we support: */
#define PSNIP_CLOCK_METHOD_CLOCK_GETTIME 1
#define PSNIP_CLOCK_METHOD_TIME 2
#define PSNIP_CLOCK_METHOD_GETTIMEOFDAY 3
#define PSNIP_CLOCK_METHOD_QUERYPERFORMANCECOUNTER 4
#define PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME 5
#define PSNIP_CLOCK_METHOD_CLOCK 6
#define PSNIP_CLOCK_METHOD_GETPROCESSTIMES 7
#define PSNIP_CLOCK_METHOD_GETRUSAGE 8
#define PSNIP_CLOCK_METHOD_GETSYSTEMTIMEPRECISEASFILETIME 9
#define PSNIP_CLOCK_METHOD_GETTICKCOUNT64 10
#include <assert.h>
#if defined(HEDLEY_UNREACHABLE)
# define PSNIP_CLOCK_UNREACHABLE() HEDLEY_UNREACHABLE()
#else
# define PSNIP_CLOCK_UNREACHABLE() assert(0)
#endif
/* Choose an implementation */
/* #undef PSNIP_CLOCK_WALL_METHOD */
/* #undef PSNIP_CLOCK_CPU_METHOD */
/* #undef PSNIP_CLOCK_MONOTONIC_METHOD */
/* We want to be able to detect the libc implementation, so we include
<limits.h> (<features.h> isn't available everywhere). */
#if defined(__unix__) || defined(__unix) || defined(__linux__)
# include <limits.h>
# include <unistd.h>
#endif
#if defined(_POSIX_TIMERS) && (_POSIX_TIMERS > 0)
/* These are known to work without librt. If you know of others
* please let us know so we can add them. */
# if \
(defined(__GLIBC__) && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17))) || \
(defined(__FreeBSD__))
# define PSNIP_CLOCK_HAVE_CLOCK_GETTIME
# elif !defined(PSNIP_CLOCK_NO_LIBRT)
# define PSNIP_CLOCK_HAVE_CLOCK_GETTIME
# endif
#endif
#if defined(_WIN32)
# if !defined(PSNIP_CLOCK_CPU_METHOD)
# define PSNIP_CLOCK_CPU_METHOD PSNIP_CLOCK_METHOD_GETPROCESSTIMES
# endif
# if !defined(PSNIP_CLOCK_MONOTONIC_METHOD)
# define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_QUERYPERFORMANCECOUNTER
# endif
#endif
#if defined(__MACH__)
# if !defined(PSNIP_CLOCK_MONOTONIC_METHOD)
# define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME
# endif
#endif
#if defined(PSNIP_CLOCK_HAVE_CLOCK_GETTIME)
# include <time.h>
# if !defined(PSNIP_CLOCK_WALL_METHOD)
# if defined(CLOCK_REALTIME_PRECISE)
# define PSNIP_CLOCK_WALL_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_WALL CLOCK_REALTIME_PRECISE
# elif !defined(__sun)
# define PSNIP_CLOCK_WALL_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_WALL CLOCK_REALTIME
# endif
# endif
# if !defined(PSNIP_CLOCK_CPU_METHOD)
# if defined(_POSIX_CPUTIME) || defined(CLOCK_PROCESS_CPUTIME_ID)
# define PSNIP_CLOCK_CPU_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_CPU CLOCK_PROCESS_CPUTIME_ID
# elif defined(CLOCK_VIRTUAL)
# define PSNIP_CLOCK_CPU_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_CPU CLOCK_VIRTUAL
# endif
# endif
# if !defined(PSNIP_CLOCK_MONOTONIC_METHOD)
# if defined(CLOCK_MONOTONIC_RAW) && !defined(__EMSCRIPTEN__)
# define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC CLOCK_MONOTONIC_RAW
# elif defined(CLOCK_MONOTONIC_PRECISE)
# define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC CLOCK_MONOTONIC_PRECISE
# elif defined(_POSIX_MONOTONIC_CLOCK) || defined(CLOCK_MONOTONIC)
# define PSNIP_CLOCK_MONOTONIC_METHOD PSNIP_CLOCK_METHOD_CLOCK_GETTIME
# define PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC CLOCK_MONOTONIC
# endif
# endif
#endif
#if defined(_POSIX_VERSION) && (_POSIX_VERSION >= 200112L)
# if !defined(PSNIP_CLOCK_WALL_METHOD)
# define PSNIP_CLOCK_WALL_METHOD PSNIP_CLOCK_METHOD_GETTIMEOFDAY
# endif
#endif
#if !defined(PSNIP_CLOCK_WALL_METHOD)
# define PSNIP_CLOCK_WALL_METHOD PSNIP_CLOCK_METHOD_TIME
#endif
#if !defined(PSNIP_CLOCK_CPU_METHOD)
# define PSNIP_CLOCK_CPU_METHOD PSNIP_CLOCK_METHOD_CLOCK
#endif
/* Primarily here for testing. */
#if !defined(PSNIP_CLOCK_MONOTONIC_METHOD) && defined(PSNIP_CLOCK_REQUIRE_MONOTONIC)
# error No monotonic clock found.
#endif
/* Implementations */
#if \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME)) || \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_CLOCK)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_CLOCK)) || \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_TIME)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_TIME)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_TIME))
# include <time.h>
#endif
#if \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETTIMEOFDAY)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_GETTIMEOFDAY)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_GETTIMEOFDAY))
# include <sys/time.h>
#endif
#if \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETPROCESSTIMES)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_GETPROCESSTIMES)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_GETPROCESSTIMES)) || \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETTICKCOUNT64)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_GETTICKCOUNT64)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_GETTICKCOUNT64))
typedef struct _FILETIME {
uint32_t dwLowDateTime;
uint32_t dwHighDateTime;
} FILETIME;
typedef union _LARGE_INTEGER {
struct {
uint32_t LowPart;
int32_t HighPart;
};
struct {
uint32_t LowPart;
int32_t HighPart;
} u;
int64_t QuadPart;
} LARGE_INTEGER;
#ifdef __cplusplus
#define PSNIP_EXTERN extern "C"
#else
#define PSNIP_EXTERN
#endif
PSNIP_EXTERN void * __stdcall GetCurrentProcess(void);
PSNIP_EXTERN int __stdcall QueryPerformanceFrequency(LARGE_INTEGER *lpFrequency);
PSNIP_EXTERN int __stdcall QueryPerformanceCounter(LARGE_INTEGER *lpPerformanceCount);
PSNIP_EXTERN int __stdcall GetProcessTimes(
void *hProcess,
FILETIME *lpCreationTime,
FILETIME *lpExitTime,
FILETIME *lpKernelTime,
FILETIME *lpUserTime
);
#endif
#if \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETRUSAGE)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_GETRUSAGE)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_GETRUSAGE))
# include <sys/time.h>
# include <sys/resource.h>
#endif
#if \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME))
# include <CoreServices/CoreServices.h>
# include <mach/mach.h>
# include <mach/mach_time.h>
#endif
/*** Implementations ***/
#define PSNIP_CLOCK_NSEC_PER_SEC ((uint32_t) (1000000000ULL))
#if \
(defined(PSNIP_CLOCK_CPU_METHOD) && (PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME)) || \
(defined(PSNIP_CLOCK_WALL_METHOD) && (PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME)) || \
(defined(PSNIP_CLOCK_MONOTONIC_METHOD) && (PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME))
PSNIP_CLOCK__FUNCTION uint32_t
psnip_clock__clock_getres (clockid_t clk_id) {
struct timespec res;
int r;
r = clock_getres(clk_id, &res);
if (r != 0)
return 0;
return (uint32_t) (PSNIP_CLOCK_NSEC_PER_SEC / res.tv_nsec);
}
PSNIP_CLOCK__FUNCTION int
psnip_clock__clock_gettime (clockid_t clk_id, struct PsnipClockTimespec* res) {
struct timespec ts;
if (clock_gettime(clk_id, &ts) != 0)
return -10;
res->seconds = (uint64_t) (ts.tv_sec);
res->nanoseconds = (uint64_t) (ts.tv_nsec);
return 0;
}
#endif
PSNIP_CLOCK__FUNCTION uint32_t
psnip_clock_wall_get_precision (void) {
#if !defined(PSNIP_CLOCK_WALL_METHOD)
return 0;
#elif defined(PSNIP_CLOCK_WALL_METHOD) && PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME
return psnip_clock__clock_getres(PSNIP_CLOCK_CLOCK_GETTIME_WALL);
#elif defined(PSNIP_CLOCK_WALL_METHOD) && PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_GETTIMEOFDAY
return 1000000;
#elif defined(PSNIP_CLOCK_WALL_METHOD) && PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_TIME
return 1;
#else
return 0;
#endif
}
PSNIP_CLOCK__FUNCTION int
psnip_clock_wall_get_time (struct PsnipClockTimespec* res) {
(void) res;
#if !defined(PSNIP_CLOCK_WALL_METHOD)
return -2;
#elif defined(PSNIP_CLOCK_WALL_METHOD) && PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME
return psnip_clock__clock_gettime(PSNIP_CLOCK_CLOCK_GETTIME_WALL, res);
#elif defined(PSNIP_CLOCK_WALL_METHOD) && PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_TIME
res->seconds = time(NULL);
res->nanoseconds = 0;
#elif defined(PSNIP_CLOCK_WALL_METHOD) && PSNIP_CLOCK_WALL_METHOD == PSNIP_CLOCK_METHOD_GETTIMEOFDAY
struct timeval tv;
if (gettimeofday(&tv, NULL) != 0)
return -6;
res->seconds = tv.tv_sec;
res->nanoseconds = tv.tv_usec * 1000;
#else
return -2;
#endif
return 0;
}
PSNIP_CLOCK__FUNCTION uint32_t
psnip_clock_cpu_get_precision (void) {
#if !defined(PSNIP_CLOCK_CPU_METHOD)
return 0;
#elif defined(PSNIP_CLOCK_CPU_METHOD) && PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME
return psnip_clock__clock_getres(PSNIP_CLOCK_CLOCK_GETTIME_CPU);
#elif defined(PSNIP_CLOCK_CPU_METHOD) && PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK
return CLOCKS_PER_SEC;
#elif defined(PSNIP_CLOCK_CPU_METHOD) && PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETPROCESSTIMES
return PSNIP_CLOCK_NSEC_PER_SEC / 100;
#else
return 0;
#endif
}
PSNIP_CLOCK__FUNCTION int
psnip_clock_cpu_get_time (struct PsnipClockTimespec* res) {
#if !defined(PSNIP_CLOCK_CPU_METHOD)
(void) res;
return -2;
#elif defined(PSNIP_CLOCK_CPU_METHOD) && PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME
return psnip_clock__clock_gettime(PSNIP_CLOCK_CLOCK_GETTIME_CPU, res);
#elif defined(PSNIP_CLOCK_CPU_METHOD) && PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_CLOCK
clock_t t = clock();
if (t == ((clock_t) -1))
return -5;
res->seconds = t / CLOCKS_PER_SEC;
res->nanoseconds = (t % CLOCKS_PER_SEC) * (PSNIP_CLOCK_NSEC_PER_SEC / CLOCKS_PER_SEC);
#elif defined(PSNIP_CLOCK_CPU_METHOD) && PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETPROCESSTIMES
FILETIME CreationTime, ExitTime, KernelTime, UserTime;
LARGE_INTEGER date, adjust;
if (!GetProcessTimes(GetCurrentProcess(), &CreationTime, &ExitTime, &KernelTime, &UserTime))
return -7;
/* http://www.frenk.com/2009/12/convert-filetime-to-unix-timestamp/ */
date.HighPart = UserTime.dwHighDateTime;
date.LowPart = UserTime.dwLowDateTime;
adjust.QuadPart = 11644473600000 * 10000;
date.QuadPart -= adjust.QuadPart;
res->seconds = date.QuadPart / 10000000;
res->nanoseconds = (date.QuadPart % 10000000) * (PSNIP_CLOCK_NSEC_PER_SEC / 100);
#elif PSNIP_CLOCK_CPU_METHOD == PSNIP_CLOCK_METHOD_GETRUSAGE
struct rusage usage;
if (getrusage(RUSAGE_SELF, &usage) != 0)
return -8;
res->seconds = usage.ru_utime.tv_sec;
res->nanoseconds = tv.tv_usec * 1000;
#else
(void) res;
return -2;
#endif
return 0;
}
PSNIP_CLOCK__FUNCTION uint32_t
psnip_clock_monotonic_get_precision (void) {
#if !defined(PSNIP_CLOCK_MONOTONIC_METHOD)
return 0;
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME
return psnip_clock__clock_getres(PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC);
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME
static mach_timebase_info_data_t tbi = { 0, };
if (tbi.denom == 0)
mach_timebase_info(&tbi);
return (uint32_t) (tbi.numer / tbi.denom);
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_GETTICKCOUNT64
return 1000;
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_QUERYPERFORMANCECOUNTER
LARGE_INTEGER Frequency;
QueryPerformanceFrequency(&Frequency);
return (uint32_t) ((Frequency.QuadPart > PSNIP_CLOCK_NSEC_PER_SEC) ? PSNIP_CLOCK_NSEC_PER_SEC : Frequency.QuadPart);
#else
return 0;
#endif
}
PSNIP_CLOCK__FUNCTION int
psnip_clock_monotonic_get_time (struct PsnipClockTimespec* res) {
#if !defined(PSNIP_CLOCK_MONOTONIC_METHOD)
(void) res;
return -2;
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_CLOCK_GETTIME
return psnip_clock__clock_gettime(PSNIP_CLOCK_CLOCK_GETTIME_MONOTONIC, res);
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_MACH_ABSOLUTE_TIME
uint64_t nsec = mach_absolute_time();
static mach_timebase_info_data_t tbi = { 0, };
if (tbi.denom == 0)
mach_timebase_info(&tbi);
nsec *= ((uint64_t) tbi.numer) / ((uint64_t) tbi.denom);
res->seconds = nsec / PSNIP_CLOCK_NSEC_PER_SEC;
res->nanoseconds = nsec % PSNIP_CLOCK_NSEC_PER_SEC;
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_QUERYPERFORMANCECOUNTER
LARGE_INTEGER t, f;
if (QueryPerformanceCounter(&t) == 0)
return -12;
QueryPerformanceFrequency(&f);
res->seconds = t.QuadPart / f.QuadPart;
res->nanoseconds = t.QuadPart % f.QuadPart;
if (f.QuadPart > PSNIP_CLOCK_NSEC_PER_SEC)
res->nanoseconds /= f.QuadPart / PSNIP_CLOCK_NSEC_PER_SEC;
else
res->nanoseconds *= PSNIP_CLOCK_NSEC_PER_SEC / f.QuadPart;
#elif defined(PSNIP_CLOCK_MONOTONIC_METHOD) && PSNIP_CLOCK_MONOTONIC_METHOD == PSNIP_CLOCK_METHOD_GETTICKCOUNT64
const ULONGLONG msec = GetTickCount64();
res->seconds = msec / 1000;
res->nanoseconds = sec % 1000;
#else
return -2;
#endif
return 0;
}
/* Returns the number of ticks per second for the specified clock.
* For example, a clock with millisecond precision would return 1000,
* and a clock with 1 second (such as the time() function) would
* return 1.
*
* If the requested clock isn't available, it will return 0.
* Hopefully this will be rare, but if it happens to you please let us
* know so we can work on finding a way to support your system.
*
* Note that different clocks on the same system often have a
* different precisions.
*/
PSNIP_CLOCK__FUNCTION uint32_t
psnip_clock_get_precision (enum PsnipClockType clock_type) {
switch (clock_type) {
case PSNIP_CLOCK_TYPE_MONOTONIC:
return psnip_clock_monotonic_get_precision ();
case PSNIP_CLOCK_TYPE_CPU:
return psnip_clock_cpu_get_precision ();
case PSNIP_CLOCK_TYPE_WALL:
return psnip_clock_wall_get_precision ();
}
PSNIP_CLOCK_UNREACHABLE();
return 0;
}
/* Set the provided timespec to the requested time. Returns 0 on
* success, or a negative value on failure. */
PSNIP_CLOCK__FUNCTION int
psnip_clock_get_time (enum PsnipClockType clock_type, struct PsnipClockTimespec* res) {
assert(res != NULL);
switch (clock_type) {
case PSNIP_CLOCK_TYPE_MONOTONIC:
return psnip_clock_monotonic_get_time (res);
case PSNIP_CLOCK_TYPE_CPU:
return psnip_clock_cpu_get_time (res);
case PSNIP_CLOCK_TYPE_WALL:
return psnip_clock_wall_get_time (res);
}
return -1;
}
#endif /* !defined(PSNIP_CLOCK_H) */