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/*
* Simple text-based progress display module for GIT
*
* Copyright (c) 2007 by Nicolas Pitre <nico@cam.org>
*
* This code is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "git-compat-util.h"
#include "progress.h"
#define TP_IDX_MAX 8
struct throughput {
struct timeval prev_tv;
unsigned long count;
unsigned long avg_bytes;
unsigned long last_bytes[TP_IDX_MAX];
unsigned int avg_misecs;
unsigned int last_misecs[TP_IDX_MAX];
unsigned int idx;
char display[20];
};
struct progress {
const char *title;
int last_value;
unsigned total;
unsigned last_percent;
unsigned delay;
unsigned delayed_percent_treshold;
struct throughput *throughput;
};
static volatile sig_atomic_t progress_update;
static void progress_interval(int signum)
{
progress_update = 1;
}
static void set_progress_signal(void)
{
struct sigaction sa;
struct itimerval v;
progress_update = 0;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = progress_interval;
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sigaction(SIGALRM, &sa, NULL);
v.it_interval.tv_sec = 1;
v.it_interval.tv_usec = 0;
v.it_value = v.it_interval;
setitimer(ITIMER_REAL, &v, NULL);
}
static void clear_progress_signal(void)
{
struct itimerval v = {{0,},};
setitimer(ITIMER_REAL, &v, NULL);
signal(SIGALRM, SIG_IGN);
progress_update = 0;
}
static int display(struct progress *progress, unsigned n, int done)
{
char *eol, *tp;
if (progress->delay) {
if (!progress_update || --progress->delay)
return 0;
if (progress->total) {
unsigned percent = n * 100 / progress->total;
if (percent > progress->delayed_percent_treshold) {
/* inhibit this progress report entirely */
clear_progress_signal();
progress->delay = -1;
progress->total = 0;
return 0;
}
}
}
progress->last_value = n;
tp = (progress->throughput) ? progress->throughput->display : "";
eol = done ? ", done. \n" : " \r";
if (progress->total) {
unsigned percent = n * 100 / progress->total;
if (percent != progress->last_percent || progress_update) {
progress->last_percent = percent;
fprintf(stderr, "%s: %3u%% (%u/%u)%s%s",
progress->title, percent, n,
progress->total, tp, eol);
progress_update = 0;
return 1;
}
} else if (progress_update) {
fprintf(stderr, "%s: %u%s%s", progress->title, n, tp, eol);
progress_update = 0;
return 1;
}
return 0;
}
void display_throughput(struct progress *progress, unsigned long n)
{
struct throughput *tp;
struct timeval tv;
unsigned int misecs;
if (!progress)
return;
tp = progress->throughput;
gettimeofday(&tv, NULL);
if (!tp) {
progress->throughput = tp = calloc(1, sizeof(*tp));
if (tp)
tp->prev_tv = tv;
return;
}
tp->count += n;
/*
* We have x = bytes and y = microsecs. We want z = KiB/s:
*
* z = (x / 1024) / (y / 1000000)
* z = x / y * 1000000 / 1024
* z = x / (y * 1024 / 1000000)
* z = x / y'
*
* To simplify things we'll keep track of misecs, or 1024th of a sec
* obtained with:
*
* y' = y * 1024 / 1000000
* y' = y / (1000000 / 1024)
* y' = y / 977
*/
misecs = (tv.tv_sec - tp->prev_tv.tv_sec) * 1024;
misecs += (int)(tv.tv_usec - tp->prev_tv.tv_usec) / 977;
if (misecs > 512) {
tp->prev_tv = tv;
tp->avg_bytes += tp->count;
tp->avg_misecs += misecs;
snprintf(tp->display, sizeof(tp->display),
", %lu KiB/s", tp->avg_bytes / tp->avg_misecs);
tp->avg_bytes -= tp->last_bytes[tp->idx];
tp->avg_misecs -= tp->last_misecs[tp->idx];
tp->last_bytes[tp->idx] = tp->count;
tp->last_misecs[tp->idx] = misecs;
tp->idx = (tp->idx + 1) % TP_IDX_MAX;
tp->count = 0;
}
}
int display_progress(struct progress *progress, unsigned n)
{
return progress ? display(progress, n, 0) : 0;
}
struct progress *start_progress_delay(const char *title, unsigned total,
unsigned percent_treshold, unsigned delay)
{
struct progress *progress = malloc(sizeof(*progress));
if (!progress) {
/* unlikely, but here's a good fallback */
fprintf(stderr, "%s...\n", title);
return NULL;
}
progress->title = title;
progress->total = total;
progress->last_value = -1;
progress->last_percent = -1;
progress->delayed_percent_treshold = percent_treshold;
progress->delay = delay;
progress->throughput = NULL;
set_progress_signal();
return progress;
}
struct progress *start_progress(const char *title, unsigned total)
{
return start_progress_delay(title, total, 0, 0);
}
void stop_progress(struct progress **p_progress)
{
struct progress *progress = *p_progress;
if (!progress)
return;
*p_progress = NULL;
if (progress->last_value != -1) {
/* Force the last update */
progress_update = 1;
display(progress, progress->last_value, 1);
}
clear_progress_signal();
free(progress->throughput);
free(progress);
}
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