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/*

* This file is part of the Micro Python project, http://micropython.org/

*

* The MIT License (MIT)

*

* Copyright (c) 2013, 2014 Damien P. George

*

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

*

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

*

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

*/

#include <windows.h>

#include <errno.h>

#include <limits.h>

HANDLE waitTimer = NULL;

void init_sleep(void) {

waitTimer = CreateWaitableTimer(NULL, TRUE, NULL);

}

void deinit_sleep(void) {

if (waitTimer != NULL) {

CloseHandle(waitTimer);

waitTimer = NULL;

}

}

int usleep_impl(__int64 usec) {

if (waitTimer == NULL) {

errno = EAGAIN;

return -1;

}

if (usec < 0 || usec > LLONG_MAX / 10) {

errno = EINVAL;

return -1;

}

LARGE_INTEGER ft;

ft.QuadPart = -10 * usec; // 100 nanosecond interval, negative value = relative time

if (SetWaitableTimer(waitTimer, &ft, 0, NULL, NULL, 0) == 0) {

errno = EINVAL;

return -1;

}

if (WaitForSingleObject(waitTimer, INFINITE) != WAIT_OBJECT_0) {

errno = EAGAIN;

return -1;

}

return 0;

}

#ifdef _MSC_VER // mingw and the likes provide their own usleep()

int usleep(__int64 usec) {

return usleep_impl(usec);

}

#endif

void msec_sleep(double msec) {

const double usec = msec * 1000.0;

usleep_impl(usec > (double)LLONG_MAX ? LLONG_MAX : (__int64)usec);

}