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71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
/*
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* Copyright (C) 2020 TUBA Freiberg
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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 tests
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* @{
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* @file
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* @brief Test sys/sched_round_robin
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* @author Karl Fessel <karl.fessel@ovgu.de>
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* @}
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*/
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#include <stdio.h>
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#include <stdint.h>
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#include "thread.h"
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#include "mutex.h"
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static mutex_t _shared_mutex;
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void * thread_mutex_unlock(void *d)
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{
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(void) d;
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puts("mutex_thread yield");
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thread_yield();
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puts("unlock mutex");
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mutex_unlock(&_shared_mutex);
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return NULL;
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}
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void * thread_bad(void *d)
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{
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(void) d;
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puts("bad thread looping");
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for (;;) {
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/* I'm a bad thread I do nothing and I do that all the time */
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}
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}
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/* each thread gets a stack */
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static char stack[2][THREAD_STACKSIZE_DEFAULT];
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/* with priority inversion this should be set to THREAD_PRIORITY_MAIN
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* until then a lower priority (higher number) is the better choice */
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const uint8_t shared_prio = THREAD_PRIORITY_MAIN + 1;
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int main(void)
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{
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puts("starting threads");
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mutex_init(&_shared_mutex);
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thread_create(stack[0], sizeof(stack[0]), shared_prio, THREAD_CREATE_STACKTEST,
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thread_mutex_unlock, NULL, "TMutex");
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thread_create(stack[1], sizeof(stack[1]), shared_prio, THREAD_CREATE_STACKTEST,
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thread_bad, NULL, "TBad");
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puts("double locking mutex");
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mutex_lock(&_shared_mutex);
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mutex_lock(&_shared_mutex);
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/* success: mutex got unlocked, which means thread "TMutex" got cpu time
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* even though "TBad" was trying to hog the whole CPU */
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puts("[SUCCESS]");
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}
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