You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
circuitpython/windows/sleep.c

76 lines
2.3 KiB

/*
* 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);
}