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#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "litmus.h"
#define OPTSTR "d:wf:"
#define NS_PER_MS 1000000
#define LITMUS_STATS_FILE "/proc/litmus/stats"
void usage(char *error) {
fprintf(stderr,
"%s\n"
"Usage: release_ts [OPTIONS]\n"
"\n"
"Options: -d <delay in ms> (default: 1000ms)\n"
" -w wait until all tasks are ready for release\n"
" (as determined by /proc/litmus/stats\n"
" -f <#tasks> wait for #tasks (default: 0)\n"
"\n",
error);
exit(1);
}
ssize_t read_file(const char* fname, void* buf, size_t maxlen)
{
int fd;
ssize_t n = 0;
size_t got = 0;
fd = open(fname, O_RDONLY);
if (fd == -1)
return -1;
while (got < maxlen && (n = read(fd, buf + got, maxlen - got)) > 0)
got += n;
close(fd);
if (n < 0)
return -1;
else
return got;
}
void wait_until_ready(int expected)
{
int ready = 0, all = 0;
char buf[100];
int loops = 0;
ssize_t len;
do {
if (loops++ > 0)
sleep(1);
len = read_file(LITMUS_STATS_FILE, buf, sizeof(buf) - 1);
if (len < 0) {
fprintf(stderr,
"(EE) Error while reading '%s': %m.\n"
"(EE) Ignoring -w option.\n",
LITMUS_STATS_FILE);
break;
} else {
len = sscanf(buf,
"real-time tasks = %d\n"
"ready for release = %d\n",
&all, &ready);
if (len != 2) {
fprintf(stderr,
"(EE) Could not parse '%s'.\n"
"(EE) Ignoring -w option.\n",
LITMUS_STATS_FILE);
break;
}
}
} while (expected > ready || ready < all);
}
int main(int argc, char** argv)
{
int released;
lt_t delay = ms2lt(1000);
int wait = 0;
int expected = 0;
int opt;
while ((opt = getopt(argc, argv, OPTSTR)) != -1) {
switch (opt) {
case 'd':
delay = ms2lt(atoi(optarg));
break;
case 'w':
wait = 1;
break;
case 'f':
expected = atoi(optarg);
break;
case ':':
usage("Argument missing.");
break;
case '?':
default:
usage("Bad argument.");
break;
}
}
if (wait)
wait_until_ready(expected);
released = release_ts(&delay);
if (released < 0) {
perror("release task system");
exit(1);
}
printf("Released %d real-time tasks.\n", released);
return 0;
}
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