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58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/*
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* Copyright (C) 2021 Otto-von-Guericke-Universität Magdeburg
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup sys_shell_commands
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* @{
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*
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* @file
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* @brief A shell command to change the niceness (inverse priority) of a thread
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*
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* @note Enable this by using the modules shell_cmds_default and
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* shell_cmd_nice
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*
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* @author Marian Buschsieweke <marian.buschsieweke@ovgu.de>
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*
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* @}
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "sched.h"
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#include "shell.h"
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#include "thread.h"
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static int _sc_nice(int argc, char **argv)
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{
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if (argc != 3) {
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printf("Usage: %s <THREAD_ID> <PRIORITY>\n"
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"Note: Lower number means higher priority (niceness)\n",
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argv[0]);
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return EXIT_FAILURE;
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}
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/* Note: thread_get() does bounds checking and returns NULL on out of bounds PID */
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thread_t *thread = thread_get(atoi(argv[1]));
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if (!thread) {
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printf("No active thread found for ID \"%s\"\n", argv[1]);
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return EXIT_FAILURE;
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}
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uint8_t prio = atoi(argv[2]);
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if (prio >= SCHED_PRIO_LEVELS) {
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printf("Priority \"%s\" is invalid (try 0..%u)\n",
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argv[2], (unsigned)SCHED_PRIO_LEVELS - 1);
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}
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sched_change_priority(thread, prio);
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return EXIT_SUCCESS;
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}
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SHELL_COMMAND(nice, "Change priority of an active thread", _sc_nice);
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