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7010835a AB |
1 | /* This testcase is part of GDB, the GNU debugger. |
2 | ||
b811d2c2 | 3 | Copyright 2018-2020 Free Software Foundation, Inc. |
7010835a AB |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
17 | ||
18 | #include <pthread.h> | |
19 | #include <stdio.h> | |
20 | #include <stdlib.h> | |
21 | #include <assert.h> | |
22 | #define NUM_THREADS 4 | |
23 | ||
24 | /* Crude spin lock. Threads all spin until this is set to 0. */ | |
25 | int go = 1; | |
26 | ||
27 | /* Thread function, just spin until GO is set to 0. */ | |
28 | void * | |
29 | perform_work (void *argument) | |
30 | { | |
31 | /* Cast to volatile to ensure that ARGUMENT is loaded each time around | |
32 | the loop. */ | |
33 | while (*((volatile int*) argument)) | |
34 | { | |
35 | /* Nothing. */ | |
36 | } | |
37 | return NULL; | |
38 | } | |
39 | ||
40 | /* The spin loop for the main thread. */ | |
41 | void | |
42 | function (void) | |
43 | { | |
44 | (void) perform_work (&go); | |
45 | printf ("Finished from function\n"); | |
46 | } | |
47 | ||
48 | /* Main program, create some threads which all spin waiting for GO to be | |
49 | set to 0. */ | |
50 | int | |
51 | main (void) | |
52 | { | |
53 | pthread_t threads[NUM_THREADS]; | |
54 | int result_code; | |
55 | unsigned index; | |
56 | ||
57 | /* Create some threads. */ | |
58 | for (index = 0; index < NUM_THREADS; ++index) | |
59 | { | |
60 | printf ("In main: creating thread %d\n", index); | |
61 | result_code = pthread_create (&threads[index], NULL, perform_work, &go); | |
62 | assert (!result_code); | |
63 | } | |
64 | ||
65 | function (); | |
66 | ||
67 | /* Wait for each thread to complete. */ | |
68 | for (index = 0; index < NUM_THREADS; ++index) | |
69 | { | |
70 | /* Block until thread INDEX completes. */ | |
71 | result_code = pthread_join (threads[index], NULL); | |
72 | assert (!result_code); | |
73 | printf ("In main: thread %d has completed\n", index); | |
74 | } | |
75 | printf ("In main: All threads completed successfully\n"); | |
76 | return 0; | |
77 | } |