Re: [Mingw-w64-public] std::thread::sleep_for() question

[Dongsheng Song]

于 2011-9-2 14:34, Dongsheng Song 写道:
> On Fri, Sep 2, 2011 at 14:22, JonY <jo...@users.sourceforge.net> wrote:
>> Why not, the more code the merrier :)
>>
> [
> 2011-09-02  Dongsheng Song  <dongsh...@users.sourceforge.net>:
>         * misc/nanosleep.c: New.
>         * testcases/t_nanosleep.c: New.
> ]
>
> New:
> mingw-w64-crt/misc/nanosleep.c
> mingw-w64-crt/testcases/t_nanosleep.c
>
> Please update mingw-w64-crt/Makefile.am and mingw-w64-headers/crt/time.h
> when you want to add these files to mingw-w64-crt.
>
> --
> Dongsheng
Sorry, I post the old version of nanosleep.c in the previous mail.


/**
 * 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 <time.h>
#include <windows.h>

#define POW10_3                 1000
#define POW10_4                 10000
#define POW10_6                 1000000
#define POW10_9                 1000000000
#define MAX_SLEEP_IN_MS         4294967294UL

/**
 * Sleep for the specified time.
 * @param  request The desired amount of time to sleep.
 * @param  remain The remain amount of time to sleep.
 * @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 nanosleep(const struct timespec *request, struct timespec *remain)
{
    unsigned long ms, rc = 0;
    unsigned __int64 u64, want, real;

    union {
        unsigned __int64 ns100;
        FILETIME ft;
    }  _start, _end;

    if (request->tv_sec < 0 || request->tv_nsec < 0 || request->tv_nsec >= 
POW10_9) {
        errno = EINVAL;
        return -1;
    }

    if (remain != NULL) GetSystemTimeAsFileTime(&_start.ft);

    want = u64 = request->tv_sec * POW10_3 + request->tv_nsec / POW10_6;
    while (u64 > 0) {
        if (u64 >= MAX_SLEEP_IN_MS) ms = MAX_SLEEP_IN_MS;
        else ms = (unsigned long) u64;

        u64 -= ms;
        rc = SleepEx(ms, TRUE);
    }

    if (rc != 0) { /* WAIT_IO_COMPLETION */
        if (remain != NULL) {
            GetSystemTimeAsFileTime(&_end.ft);
            real = (_end.ns100 - _start.ns100) / POW10_4;

            if (real >= want) u64 = 0;
            else u64 = want - real;

            remain->tv_sec = u64 / POW10_3;
            remain->tv_nsec = (long) (u64 % POW10_3) * POW10_6;
        }

        errno = EINTR;
        return -1;
    }

    return 0;
}

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