/* * Copyright (c) 2025 Jiri Svoboda * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include <errno.h> #include <fibril.h> #include <fibril_synch.h> //#include <stdio.h> //#include <stddef.h> #include "../tester.h" static fibril_mutex_t fm1, fm2; static errno_t fibril_fn(void *data) { TPRINTF("F2: Lock M2\n"); fibril_mutex_lock(&fm2); fibril_sleep(1); TPRINTF("F2: Lock M1\n"); fibril_mutex_lock(&fm1); TPRINTF("F2: Unlock M1, M2\n"); fibril_mutex_unlock(&fm1); fibril_mutex_unlock(&fm2); return EOK; } const char *test_deadlock(void) { fid_t fid; fibril_mutex_initialize(&fm1); fibril_mutex_initialize(&fm2); TPRINTF("Creating fibril\n"); fid = fibril_create(fibril_fn, NULL); if (fid == 0) { TPRINTF("\nCould not create fibril.\n"); goto error; } fibril_add_ready(fid); TPRINTF("F1: Lock M1\n"); fibril_mutex_lock(&fm1); fibril_sleep(1); TPRINTF("F1: Lock M2\n"); fibril_mutex_lock(&fm2); TPRINTF("F1: Unlock M2, M1\n"); fibril_mutex_unlock(&fm2); fibril_mutex_unlock(&fm1); return NULL; error: return "Test failed"; }