*
* Robert Love <rml@tech9.net>
* 27-Apr-2002: initial version
+ * 04-May-2011: make thread aware - Davidlohr Bueso <dave@gnu.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, v2, as
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
-#include <err.h>
+#include "c.h"
#include "nls.h"
+#include "strutils.h"
+#include "procutils.h"
+
/* the SCHED_BATCH is supported since Linux 2.6.16
* -- temporary workaround for people with old glibc headers
*/
# define SCHED_IDLE 5
#endif
-#ifndef ARRAY_SIZE
-# define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
+#if defined(__linux__) && !defined(SCHED_RESET_ON_FORK)
+#define SCHED_RESET_ON_FORK 0x40000000
#endif
-static void show_usage(int rc)
+
+static void __attribute__((__noreturn__)) show_usage(int rc)
{
- fprintf(stdout, _(
- "\nchrt - manipulate real-time attributes of a process.\n"
+ FILE *out = rc == EXIT_SUCCESS ? stdout : stderr;
+
+ fprintf(out, _(
+ "\nchrt - manipulate real-time attributes of a process\n"
"\nSet policy:\n"
" chrt [options] <policy> <priority> {<pid> | <command> [<arg> ...]}\n"
"\nGet policy:\n"
- " chrt [options] {<pid> | <command> [<arg> ...]}\n\n"
+ " chrt [options] {<pid> | <command> [<arg> ...]}\n"));
+
+ fprintf(out, _(
"\nScheduling policies:\n"
" -b | --batch set policy to SCHED_BATCH\n"
" -f | --fifo set policy to SCHED_FIFO\n"
" -i | --idle set policy to SCHED_IDLE\n"
" -o | --other set policy to SCHED_OTHER\n"
- " -r | --rr set policy to SCHED_RR (default)\n"
+ " -r | --rr set policy to SCHED_RR (default)\n"));
+
+#ifdef SCHED_RESET_ON_FORK
+ fprintf(out, _(
+ "\nScheduling flags:\n"
+ " -R | --reset-on-fork set SCHED_RESET_ON_FORK for FIFO or RR\n"));
+#endif
+ fprintf(out, _(
"\nOptions:\n"
+ " -a | --all-tasks operate on all the tasks (threads) for a given pid\n"
" -h | --help display this help\n"
- " -p | --pid operate on existing given pid\n"
" -m | --max show min and max valid priorities\n"
+ " -p | --pid operate on existing given pid\n"
" -v | --verbose display status information\n"
" -V | --version output version information\n\n"));
exit(rc);
}
-static void show_rt_info(const char *what, pid_t pid)
+static void show_rt_info(pid_t pid, int isnew)
{
struct sched_param sp;
int policy;
if (policy == -1)
err(EXIT_FAILURE, _("failed to get pid %d's policy"), pid);
- printf(_("pid %d's %s scheduling policy: "), pid, what);
+ if (isnew)
+ printf(_("pid %d's new scheduling policy: "), pid);
+ else
+ printf(_("pid %d's current scheduling policy: "), pid);
+
switch (policy) {
case SCHED_OTHER:
printf("SCHED_OTHER\n");
case SCHED_FIFO:
printf("SCHED_FIFO\n");
break;
+#ifdef SCHED_RESET_ON_FORK
+ case SCHED_FIFO | SCHED_RESET_ON_FORK:
+ printf("SCHED_FIFO|SCHED_RESET_ON_FORK\n");
+ break;
+#endif
#ifdef SCHED_IDLE
case SCHED_IDLE:
printf("SCHED_IDLE\n");
case SCHED_RR:
printf("SCHED_RR\n");
break;
+#ifdef SCHED_RESET_ON_FORK
+ case SCHED_RR | SCHED_RESET_ON_FORK:
+ printf("SCHED_RR|SCHED_RESET_ON_FORK\n");
+ break;
+#endif
#ifdef SCHED_BATCH
case SCHED_BATCH:
printf("SCHED_BATCH\n");
break;
#endif
default:
- printf(_("unknown\n"));
+ warnx(_("unknown scheduling policy"));
}
if (sched_getparam(pid, &sp))
err(EXIT_FAILURE, _("failed to get pid %d's attributes"), pid);
- printf(_("pid %d's %s scheduling priority: %d\n"),
- pid, what, sp.sched_priority);
+ if (isnew)
+ printf(_("pid %d's new scheduling priority: %d\n"),
+ pid, sp.sched_priority);
+ else
+ printf(_("pid %d's current scheduling priority: %d\n"),
+ pid, sp.sched_priority);
}
static void show_min_max(void)
{
- int i;
- int policies[] = { SCHED_OTHER, SCHED_FIFO, SCHED_RR,
+ unsigned long i;
+ int policies[] = {
+ SCHED_OTHER,
+ SCHED_FIFO,
+ SCHED_RR,
#ifdef SCHED_BATCH
- SCHED_BATCH,
+ SCHED_BATCH,
#endif
#ifdef SCHED_IDLE
- SCHED_IDLE,
+ SCHED_IDLE,
#endif
- };
- const char *names[] = { "OTHER", "FIFO", "RR",
+ };
+ const char *names[] = {
+ "OTHER",
+ "FIFO",
+ "RR",
#ifdef SCHED_BATCH
- "BATCH",
+ "BATCH",
#endif
#ifdef SCHED_IDLE
- "IDLE",
+ "IDLE",
#endif
- };
+ };
for (i = 0; i < ARRAY_SIZE(policies); i++) {
int max = sched_get_priority_max(policies[i]);
}
}
-int main(int argc, char *argv[])
+int main(int argc, char **argv)
{
- int i, policy = SCHED_RR, priority = 0, verbose = 0;
+ int i, policy = SCHED_RR, priority = 0, verbose = 0, policy_flag = 0,
+ all_tasks = 0;
struct sched_param sp;
pid_t pid = -1;
- struct option longopts[] = {
+ static const struct option longopts[] = {
+ { "all-tasks", 0, NULL, 'a' },
{ "batch", 0, NULL, 'b' },
{ "fifo", 0, NULL, 'f' },
{ "idle", 0, NULL, 'i' },
{ "max", 0, NULL, 'm' },
{ "other", 0, NULL, 'o' },
{ "rr", 0, NULL, 'r' },
+ { "reset-on-fork", 0, NULL, 'R' },
{ "verbose", 0, NULL, 'v' },
{ "version", 0, NULL, 'V' },
{ NULL, 0, NULL, 0 }
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
- while((i = getopt_long(argc, argv, "+bfiphmorvV", longopts, NULL)) != -1)
+ while((i = getopt_long(argc, argv, "+abfiphmoRrvV", longopts, NULL)) != -1)
{
int ret = EXIT_FAILURE;
switch (i) {
+ case 'a':
+ all_tasks = 1;
+ break;
case 'b':
#ifdef SCHED_BATCH
policy = SCHED_BATCH;
case 'f':
policy = SCHED_FIFO;
break;
+ case 'R':
+#ifdef SCHED_RESET_ON_FORK
+ policy_flag |= SCHED_RESET_ON_FORK;
+#endif
+ break;
case 'i':
#ifdef SCHED_IDLE
policy = SCHED_IDLE;
break;
case 'm':
show_min_max();
- return 0;
+ return EXIT_SUCCESS;
case 'o':
policy = SCHED_OTHER;
break;
case 'p':
errno = 0;
- pid = strtol(argv[argc - 1], NULL, 10);
- if (errno)
- err(EXIT_FAILURE, _("failed to parse pid"));
+ pid = strtol_or_err(argv[argc - 1], _("failed to parse pid"));
break;
case 'r':
policy = SCHED_RR;
verbose = 1;
break;
case 'V':
- printf("chrt (%s)\n", PACKAGE_STRING);
- return 0;
+ printf("%s from %s\n", program_invocation_short_name,
+ PACKAGE_STRING);
+ return EXIT_SUCCESS;
case 'h':
ret = EXIT_SUCCESS;
default:
}
}
- if (((pid > -1) && argc - optind < 1) || ((pid == -1) && argc - optind < 2))
+ if (((pid > -1) && argc - optind < 1) ||
+ ((pid == -1) && argc - optind < 2))
show_usage(EXIT_FAILURE);
if ((pid > -1) && (verbose || argc - optind == 1)) {
- show_rt_info(_("current"), pid);
+ if (all_tasks) {
+ pid_t tid;
+ struct proc_tasks *ts = proc_open_tasks(pid);
+
+ if (!ts)
+ err(EXIT_FAILURE, _("cannot obtain the list of tasks"));
+ while (!proc_next_tid(ts, &tid))
+ show_rt_info(tid, FALSE);
+ proc_close_tasks(ts);
+ } else
+ show_rt_info(pid, FALSE);
+
if (argc - optind == 1)
return EXIT_SUCCESS;
}
errno = 0;
- priority = strtol(argv[optind], NULL, 10);
- if (errno)
- err(EXIT_FAILURE, _("failed to parse priority"));
+ priority = strtol_or_err(argv[optind], _("failed to parse priority"));
+
+#ifdef SCHED_RESET_ON_FORK
+ /* sanity check */
+ if ((policy_flag & SCHED_RESET_ON_FORK) &&
+ !(policy == SCHED_FIFO || policy == SCHED_RR))
+ errx(EXIT_FAILURE, _("SCHED_RESET_ON_FORK flag is suppoted for "
+ "SCHED_FIFO and SCHED_RR policies only"));
+#endif
+
+ policy |= policy_flag;
if (pid == -1)
pid = 0;
sp.sched_priority = priority;
- if (sched_setscheduler(pid, policy, &sp) == -1)
+
+ if (all_tasks) {
+ pid_t tid;
+ struct proc_tasks *ts = proc_open_tasks(pid);
+
+ if (!ts)
+ err(EXIT_FAILURE, _("cannot obtain the list of tasks"));
+ while (!proc_next_tid(ts, &tid))
+ if (sched_setscheduler(tid, policy, &sp) == -1)
+ err(EXIT_FAILURE, _("failed to set tid %d's policy"), tid);
+ proc_close_tasks(ts);
+ } else if (sched_setscheduler(pid, policy, &sp) == -1)
err(EXIT_FAILURE, _("failed to set pid %d's policy"), pid);
if (verbose)
- show_rt_info("new", pid);
+ show_rt_info(pid, TRUE);
if (!pid) {
argv += optind + 1;
projects / framework / base / util-linux-ng.git / blobdiff