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/**
* This file has no copyright assigned and is placed in the Public Domain.
* This file is part of the w64 mingw-runtime package.
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
*/
#include <errno.h>
#include <stdint.h>
#include <time.h>
#include <windows.h>
#ifndef IN_WINPTHREAD
#define IN_WINPTHREAD 1
#endif
#include "pthread.h"
#include "pthread_time.h"
#define POW10_7 10000000
#define POW10_9 1000000000
/* Number of 100ns-seconds between the beginning of the Windows epoch
* (Jan. 1, 1601) and the Unix epoch (Jan. 1, 1970)
*/
#define DELTA_EPOCH_IN_100NS INT64_C(116444736000000000)
static WINPTHREADS_INLINE int lc_set_errno(int result)
{
if (result != 0) {
errno = result;
return -1;
}
return 0;
}
/**
* Get the resolution of the specified clock clock_id and
* stores it in the struct timespec pointed to by res.
* @param clock_id The clock_id argument is the identifier of the particular
* clock on which to act. The following clocks are supported:
* <pre>
* CLOCK_REALTIME System-wide real-time clock. Setting this clock
* requires appropriate privileges.
* CLOCK_MONOTONIC Clock that cannot be set and represents monotonic
* time since some unspecified starting point.
* CLOCK_PROCESS_CPUTIME_ID High-resolution per-process timer from the CPU.
* CLOCK_THREAD_CPUTIME_ID Thread-specific CPU-time clock.
* </pre>
* @param res The pointer to a timespec structure to receive the time
* resolution.
* @return If the function succeeds, the return value is 0.
* If the function fails, the return value is -1,
* with errno set to indicate the error.
*/
int clock_getres(clockid_t clock_id, struct timespec *res)
{
switch(clock_id) {
case CLOCK_MONOTONIC:
{
LARGE_INTEGER pf;
if (QueryPerformanceFrequency(&pf) == 0)
return lc_set_errno(EINVAL);
res->tv_sec = 0;
res->tv_nsec = (int) ((POW10_9 + (pf.QuadPart >> 1)) / pf.QuadPart);
if (res->tv_nsec < 1)
res->tv_nsec = 1;
return 0;
}
case CLOCK_REALTIME:
case CLOCK_PROCESS_CPUTIME_ID:
case CLOCK_THREAD_CPUTIME_ID:
{
DWORD timeAdjustment, timeIncrement;
BOOL isTimeAdjustmentDisabled;
(void) GetSystemTimeAdjustment(&timeAdjustment, &timeIncrement, &isTimeAdjustmentDisabled);
res->tv_sec = 0;
res->tv_nsec = timeIncrement * 100;
return 0;
}
default:
break;
}
return lc_set_errno(EINVAL);
}
/**
* Get the time of the specified clock clock_id and stores it in the struct
* timespec pointed to by tp.
* @param clock_id The clock_id argument is the identifier of the particular
* clock on which to act. The following clocks are supported:
* <pre>
* CLOCK_REALTIME System-wide real-time clock. Setting this clock
* requires appropriate privileges.
* CLOCK_MONOTONIC Clock that cannot be set and represents monotonic
* time since some unspecified starting point.
* CLOCK_PROCESS_CPUTIME_ID High-resolution per-process timer from the CPU.
* CLOCK_THREAD_CPUTIME_ID Thread-specific CPU-time clock.
* </pre>
* @param tp The pointer to a timespec structure to receive the time.
* @return If the function succeeds, the return value is 0.
* If the function fails, the return value is -1,
* with errno set to indicate the error.
*/
int clock_gettime(clockid_t clock_id, struct timespec *tp)
{
unsigned __int64 t;
LARGE_INTEGER pf, pc;
union {
unsigned __int64 u64;
FILETIME ft;
} ct, et, kt, ut;
switch(clock_id) {
case CLOCK_REALTIME:
{
GetSystemTimeAsFileTime(&ct.ft);
t = ct.u64 - DELTA_EPOCH_IN_100NS;
tp->tv_sec = t / POW10_7;
tp->tv_nsec = ((int) (t % POW10_7)) * 100;
return 0;
}
case CLOCK_MONOTONIC:
{
if (QueryPerformanceFrequency(&pf) == 0)
return lc_set_errno(EINVAL);
if (QueryPerformanceCounter(&pc) == 0)
return lc_set_errno(EINVAL);
tp->tv_sec = pc.QuadPart / pf.QuadPart;
tp->tv_nsec = (int) (((pc.QuadPart % pf.QuadPart) * POW10_9 + (pf.QuadPart >> 1)) / pf.QuadPart);
if (tp->tv_nsec >= POW10_9) {
tp->tv_sec ++;
tp->tv_nsec -= POW10_9;
}
return 0;
}
case CLOCK_PROCESS_CPUTIME_ID:
{
if(0 == GetProcessTimes(GetCurrentProcess(), &ct.ft, &et.ft, &kt.ft, &ut.ft))
return lc_set_errno(EINVAL);
t = kt.u64 + ut.u64;
tp->tv_sec = t / POW10_7;
tp->tv_nsec = ((int) (t % POW10_7)) * 100;
return 0;
}
case CLOCK_THREAD_CPUTIME_ID:
{
if(0 == GetThreadTimes(GetCurrentThread(), &ct.ft, &et.ft, &kt.ft, &ut.ft))
return lc_set_errno(EINVAL);
t = kt.u64 + ut.u64;
tp->tv_sec = t / POW10_7;
tp->tv_nsec = ((int) (t % POW10_7)) * 100;
return 0;
}
default:
break;
}
return lc_set_errno(EINVAL);
}
/**
* Sleep for the specified time.
* @param clock_id This argument should always be CLOCK_REALTIME (0).
* @param flags 0 for relative sleep interval, others for absolute waking up.
* @param request The desired sleep interval or absolute waking up time.
* @param remain The remain amount of time to sleep.
* The current implemention just ignore it.
* @return If the function succeeds, the return value is 0.
* If the function fails, the return value is -1,
* with errno set to indicate the error.
*/
int clock_nanosleep(clockid_t clock_id, int flags,
const struct timespec *request,
struct timespec *remain)
{
struct timespec tp;
if (clock_id != CLOCK_REALTIME)
return lc_set_errno(EINVAL);
if (flags == 0)
return nanosleep(request, remain);
/* TIMER_ABSTIME = 1 */
clock_gettime(CLOCK_REALTIME, &tp);
tp.tv_sec = request->tv_sec - tp.tv_sec;
tp.tv_nsec = request->tv_nsec - tp.tv_nsec;
if (tp.tv_nsec < 0) {
tp.tv_nsec += POW10_9;
tp.tv_sec --;
}
return nanosleep(&tp, remain);
}
/**
* Set the time of the specified clock clock_id.
* @param clock_id This argument should always be CLOCK_REALTIME (0).
* @param tp The requested time.
* @return If the function succeeds, the return value is 0.
* If the function fails, the return value is -1,
* with errno set to indicate the error.
*/
int clock_settime(clockid_t clock_id, const struct timespec *tp)
{
SYSTEMTIME st;
union {
unsigned __int64 u64;
FILETIME ft;
} t;
if (clock_id != CLOCK_REALTIME)
return lc_set_errno(EINVAL);
t.u64 = tp->tv_sec * (__int64) POW10_7 + tp->tv_nsec / 100 + DELTA_EPOCH_IN_100NS;
if (FileTimeToSystemTime(&t.ft, &st) == 0)
return lc_set_errno(EINVAL);
if (SetSystemTime(&st) == 0)
return lc_set_errno(EPERM);
return 0;
}