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/*
* Copyright (C) 2000-2019, Thomas Maier-Komor
*
* This file is part of mbuffer's source code.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mbconf.h"
#include "common.h"
#include "log.h"
#include "dest.h"
#include "globals.h"
#include "settings.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#if __STDC_VERSION__ < 199901L
#define restrict
#endif
#ifdef __sun
#if defined(__SunOS_5_8) || defined(__SunOS_5_9)
int SemWait(sema_t *s)
{
int err;
do {
err = sema_wait(s);
} while (err == EINTR);
return err;
}
#endif
#endif
static inline long long timediff(struct timespec *restrict t1, struct timespec *restrict t2)
{
long long tdiff;
tdiff = (t1->tv_sec - t2->tv_sec) * 1000000;
tdiff += (t1->tv_nsec - t2->tv_nsec) / 1000;
if (tdiff < 0) {
// Tdiff < 0 if no MONOTONIC clock and time adjust happend.
// Update time to current time to get a sane restarting
// point. Timing will transiently be incorrect.
tdiff = 0;
t2->tv_sec = t1->tv_sec;
t2->tv_nsec = t1->tv_nsec;
}
return tdiff;
}
/* Thread-safe replacement for usleep. Argument must be a whole
* number of microseconds to sleep.
*/
int mt_usleep(unsigned long long sleep_usecs)
{
struct timespec tv;
tv.tv_sec = sleep_usecs / 1000000;
tv.tv_nsec = (sleep_usecs % 1000000) * 1000;
do {
/* Sleep for the time specified in tv. If interrupted by a
* signal, place the remaining time left to sleep back into tv.
*/
if (0 == nanosleep(&tv, &tv))
return 0;
} while (errno == EINTR);
return -1;
}
long long enforceSpeedLimit(unsigned long long limit, long long num, struct timespec *last)
{
struct timespec now;
long long tdiff;
double dt;
long self = (long) pthread_self();
num += Blocksize;
if (num < 0) {
debugmsg("enforceSpeedLimit(%lld,%lld): thread %ld\n",limit,num,self);
return num;
}
(void) clock_gettime(ClockSrc,&now);
tdiff = timediff(&now,last);
dt = (double)tdiff * 1E-6;
if (((double)num/dt) > (double)limit) {
double req = (double)num/limit - dt;
long long w = (long long) (req * 1E6);
if (w >= TickTime) {
long long slept, ret;
(void) mt_usleep(w);
(void) clock_gettime(ClockSrc,last);
slept = timediff(last,&now);
ret = -(long long)((double)limit * (double)(slept-w) * 1E-6);
debugmsg("thread %ld: slept for %lld usec (planned for %lld), ret = %lld\n",self,slept,w,ret);
return ret;
} else {
debugmsg("thread %ld: request for sleeping %lld usec delayed\n",self,w);
/*
* Sleeping now would cause too much of a slowdown. So
* we defer this sleep until the sleeping time is
* longer than the tick time. Like this we can stay as
* close to the speed limit as possible.
*/
return num;
}
}
debugmsg("thread %ld: %lld/%g (%g) <= %g\n",self,num,dt,num/dt,(double)limit);
return num;
}
void releaseLock(void *l)
{
int err = pthread_mutex_unlock((pthread_mutex_t *)l);
assert(err == 0);
}
void enable_directio(int fd, const char *fn)
{
if (OptDirect == 0)
return;
#ifdef O_DIRECT
if (0 == fcntl(fd,F_SETFL,fcntl(fd,F_GETFL) | O_DIRECT))
infomsg("enabled O_DIRECT on %s\n",fn);
else
infomsg("could not enable O_DIRECT on %s\n",fn);
#endif
#ifdef __sun
if (-1 == directio(fd,DIRECTIO_ON))
infomsg("direct I/O hinting failed for output %s: %s\n",fn,strerror(errno));
else
infomsg("direct I/O hinting enabled for output to %s\n",fn);
#endif
}
int disable_directio(int fd, const char *fn)
{
#ifdef O_DIRECT
int fl = fcntl(fd,F_GETFL);
if ((fl & O_DIRECT) == 0) {
warningmsg("EINVAL without O_DIRECT on %s\n",fn);
return 0;
}
if (0 != fcntl(fd,F_SETFL,fl & ~O_DIRECT)) {
warningmsg("disabling O_DIRECT on %s failed with %s\n",fn,strerror(errno));
return 0;
}
infomsg("disabled O_DIRECT on %s\n",fn);
return 1;
#else
return 0;
#endif
}
// use only once per string formatting argument
const char *hBytes(unsigned long long v)
{
static char output[16];
char *dim = " kMGT";
while ((v != 0) && ((v % 1024) == 0)) {
++dim;
v >>= 10;
}
snprintf(output,sizeof(output),"%llu%ciB",v,*dim);
return output;
}
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