| 1 | /*
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| 2 | * Copyright (c) 2025 Jiri Svoboda
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | #include <errno.h>
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| 30 | #include <fibril.h>
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| 31 | #include <fibril_synch.h>
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| 32 | //#include <stdio.h>
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| 33 | //#include <stddef.h>
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| 34 | #include "../tester.h"
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| 35 |
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| 36 | static fibril_mutex_t fm1, fm2;
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| 37 |
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| 38 | static errno_t fibril_fn(void *data)
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| 39 | {
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| 40 | TPRINTF("F2: Lock M2\n");
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| 41 | fibril_mutex_lock(&fm2);
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| 42 | fibril_sleep(1);
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| 43 | TPRINTF("F2: Lock M1\n");
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| 44 | fibril_mutex_lock(&fm1);
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| 45 | TPRINTF("F2: Unlock M1, M2\n");
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| 46 | fibril_mutex_unlock(&fm1);
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| 47 | fibril_mutex_unlock(&fm2);
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| 48 | return EOK;
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| 49 | }
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| 50 |
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| 51 | const char *test_deadlock(void)
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| 52 | {
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| 53 | fid_t fid;
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| 54 |
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| 55 | fibril_mutex_initialize(&fm1);
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| 56 | fibril_mutex_initialize(&fm2);
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| 57 |
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| 58 | TPRINTF("Creating fibril\n");
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| 59 | fid = fibril_create(fibril_fn, NULL);
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| 60 | if (fid == 0) {
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| 61 | TPRINTF("\nCould not create fibril.\n");
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| 62 | goto error;
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| 63 | }
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| 64 |
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| 65 | fibril_add_ready(fid);
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| 66 |
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| 67 | TPRINTF("F1: Lock M1\n");
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| 68 | fibril_mutex_lock(&fm1);
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| 69 | fibril_sleep(1);
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| 70 | TPRINTF("F1: Lock M2\n");
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| 71 | fibril_mutex_lock(&fm2);
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| 72 |
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| 73 | TPRINTF("F1: Unlock M2, M1\n");
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| 74 | fibril_mutex_unlock(&fm2);
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| 75 | fibril_mutex_unlock(&fm1);
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| 76 |
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| 77 | return NULL;
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| 78 | error:
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| 79 | return "Test failed";
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| 80 | }
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