72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/**
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* This file has no copyright assigned and is placed in the Public Domain.
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* This file is part of the w64 mingw-runtime package.
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* No warranty is given; refer to the file DISCLAIMER.PD within this package.
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*/
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#include <errno.h>
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#include <time.h>
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#include <windows.h>
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#include "pthread.h"
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#include "pthread_time.h"
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#include "winpthread_internal.h"
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#define POW10_3 1000
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#define POW10_4 10000
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#define POW10_6 1000000
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#define POW10_9 1000000000
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#define MAX_SLEEP_IN_MS 4294967294UL
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/**
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* Sleep for the specified time.
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* @param request The desired amount of time to sleep.
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* @param remain The remain amount of time to sleep.
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* @return If the function succeeds, the return value is 0.
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* If the function fails, the return value is -1,
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* with errno set to indicate the error.
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*/
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int nanosleep(const struct timespec *request, struct timespec *remain)
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{
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unsigned long ms, rc = 0;
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unsigned __int64 u64, want, real;
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union {
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unsigned __int64 ns100;
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FILETIME ft;
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} _start, _end;
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if (request->tv_sec < 0 || request->tv_nsec < 0 || request->tv_nsec >= POW10_9) {
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errno = EINVAL;
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return -1;
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}
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if (remain != NULL) GetSystemTimeAsFileTime(&_start.ft);
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want = u64 = request->tv_sec * POW10_3 + request->tv_nsec / POW10_6;
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while (u64 > 0 && rc == 0) {
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if (u64 >= MAX_SLEEP_IN_MS) ms = MAX_SLEEP_IN_MS;
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else ms = (unsigned long) u64;
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u64 -= ms;
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rc = pthread_delay_np_ms(ms);
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}
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if (rc != 0) { /* WAIT_IO_COMPLETION (192) */
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if (remain != NULL) {
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GetSystemTimeAsFileTime(&_end.ft);
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real = (_end.ns100 - _start.ns100) / POW10_4;
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if (real >= want) u64 = 0;
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else u64 = want - real;
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remain->tv_sec = u64 / POW10_3;
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remain->tv_nsec = (long) (u64 % POW10_3) * POW10_6;
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}
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errno = EINTR;
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return -1;
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}
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return 0;
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}
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