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/*
* Copyright 2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <openssl/crypto.h>
#include "internal/e_os.h"
/* system-specific variants defining OSSL_sleep() */
#if defined(OPENSSL_SYS_UNIX) || defined(__DJGPP__)
void OSSL_sleep(uint64_t millis)
{
# ifdef OPENSSL_SYS_VXWORKS
struct timespec ts;
ts.tv_sec = (long int) (millis / 1000);
ts.tv_nsec = (long int) (millis % 1000) * 1000000ul;
nanosleep(&ts, NULL);
# elif defined(__TANDEM)
# if !defined(_REENTRANT)
# include <cextdecs.h(PROCESS_DELAY_)>
/* HPNS does not support usleep for non threaded apps */
PROCESS_DELAY_(millis * 1000);
# elif defined(_SPT_MODEL_)
# include <spthread.h>
# include <spt_extensions.h>
usleep(millis * 1000);
# else
usleep(millis * 1000);
# endif
# else
usleep(millis * 1000);
# endif
}
#elif defined(_WIN32)
# include <windows.h>
void OSSL_sleep(uint64_t millis)
{
/*
* Windows' Sleep() takes a DWORD argument, which is smaller than
* a uint64_t, so we need to split the two to shut the compiler up.
*/
DWORD dword_times;
DWORD i;
dword_times = (DWORD)(millis >> (8 * sizeof(DWORD)));
millis &= (DWORD)-1;
if (dword_times > 0) {
for (i = dword_times; i-- > 0;)
Sleep((DWORD)-1);
/*
* The loop above slept 1 millisec less on each iteration than it
* should, this compensates by sleeping as many milliseconds as there
* were iterations. Yes, this is nit picky!
*/
Sleep(dword_times);
}
/* Now, sleep the remaining milliseconds */
Sleep((DWORD)(millis));
}
#else
/* Fallback to a busy wait */
# include "internal/time.h"
static void ossl_sleep_secs(uint64_t secs)
{
/*
* sleep() takes an unsigned int argument, which is smaller than
* a uint64_t, so it needs to be called in smaller increments.
*/
unsigned int uint_times;
unsigned int i;
uint_times = (unsigned int)(secs >> (8 * sizeof(unsigned int)));
if (uint_times > 0) {
for (i = uint_times; i-- > 0;)
sleep((unsigned int)-1);
/*
* The loop above slept 1 second less on each iteration than it
* should, this compensates by sleeping as many seconds as there were
* iterations. Yes, this is nit picky!
*/
sleep(uint_times);
}
}
static void ossl_sleep_millis(uint64_t millis)
{
const OSSL_TIME finish
= ossl_time_add(ossl_time_now(), ossl_ms2time(millis));
while (ossl_time_compare(ossl_time_now(), finish) < 0)
/* busy wait */ ;
}
void OSSL_sleep(uint64_t millis)
{
ossl_sleep_secs(millis / 1000);
ossl_sleep_millis(millis % 1000);
}
#endif /* defined(OPENSSL_SYS_UNIX) || defined(__DJGPP__) */
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