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/*
* Copyright (C) 2016 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup tests
* @{
*
* @file
* @brief Test application for testing mutexes
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
* @}
*/
#include <stdio.h>
#include "mutex.h"
#include "thread.h"
#define THREAD_NUMOF (5U)
extern volatile thread_t *sched_active_thread;
static char stacks[THREAD_NUMOF][THREAD_STACKSIZE_MAIN];
static const char prios[THREAD_NUMOF] = {THREAD_PRIORITY_MAIN - 1, 4, 0, 2, 1};
static mutex_t testlock;
static void *lockme(void *arg)
{
(void)arg;
volatile thread_t *t = sched_active_thread;
printf("T%i (prio %i): trying to lock mutex now\n",
(int)t->pid, (int)t->priority);
mutex_lock(&testlock);
printf("T%i (prio %i): locked mutex now\n",
(int)t->pid, (int)t->priority);
thread_yield();
mutex_unlock(&testlock);
return NULL;
}
int main(void)
{
puts("Mutex order test");
puts("Please refer to the README.md for more information\n");
mutex_init(&testlock);
/* lock mutex, so that spawned threads have to wait */
mutex_lock(&testlock);
/* create threads */
for (unsigned i = 0; i < THREAD_NUMOF; i++) {
thread_create(stacks[i], sizeof(stacks[i]), prios[i], 0,
lockme, NULL, "t");
}
/* allow threads to lock the mutex */
mutex_unlock(&testlock);
mutex_lock(&testlock);
puts("\nTest END, check the order of priorities above.");
return 0;
}