1 /*
2 * Copyright (C) 2015 Cyril Hrubis <chrubis@suse.cz>
3 *
4 * Licensed under the GNU GPLv2 or later.
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 2 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
13 * the 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, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19 /*
20 * Block several processes on a mutex, then wake them up.
21 */
22
23 #include <errno.h>
24 #include <sys/types.h>
25 #include <sys/wait.h>
26
27 #include "test.h"
28 #include "safe_macros.h"
29 #include "futextest.h"
30 #include "futex_common.h"
31
32 const char *TCID="futex_wake03";
33 const int TST_TOTAL=11;
34
do_child(void)35 static void do_child(void)
36 {
37 futex_wait(futex, *futex, NULL, 0);
38 exit(0);
39 }
40
do_wake(int nr_children)41 static void do_wake(int nr_children)
42 {
43 int res, i, cnt;
44
45 res = futex_wake(futex, nr_children, 0);
46
47 if (res != nr_children) {
48 tst_resm(TFAIL,
49 "futex_wake() woken up %i children, expected %i",
50 res, nr_children);
51 return;
52 }
53
54 for (cnt = 0, i = 0; i < 100000; i++) {
55 while (waitpid(-1, &res, WNOHANG) > 0)
56 cnt++;
57
58 if (cnt == nr_children)
59 break;
60
61 usleep(100);
62 }
63
64 if (cnt != nr_children) {
65 tst_resm(TFAIL, "reaped only %i childs, expected %i",
66 cnt, nr_children);
67 } else {
68 tst_resm(TPASS, "futex_wake() woken up %i childs", cnt);
69 }
70 }
71
verify_futex_wake(void)72 static void verify_futex_wake(void)
73 {
74 int i, res;
75 pid_t pids[55];
76
77 for (i = 0; i < (int)ARRAY_SIZE(pids); i++) {
78 pids[i] = tst_fork();
79
80 switch (pids[i]) {
81 case -1:
82 tst_brkm(TBROK | TERRNO, NULL, "fork()");
83 case 0:
84 do_child();
85 default:
86 break;
87 }
88 }
89
90 for (i = 0; i < (int)ARRAY_SIZE(pids); i++)
91 tst_process_state_wait2(pids[i], 'S');
92
93 for (i = 1; i <= 10; i++)
94 do_wake(i);
95
96 res = futex_wake(futex, 1, 0);
97
98 if (res) {
99 tst_resm(TFAIL, "futex_wake() woken up %u, none were waiting",
100 res);
101 } else {
102 tst_resm(TPASS, "futex_wake() woken up 0 children");
103 }
104 }
105
main(int argc,char * argv[])106 int main(int argc, char *argv[])
107 {
108 int lc;
109
110 tst_parse_opts(argc, argv, NULL, NULL);
111
112 setup();
113
114 for (lc = 0; TEST_LOOPING(lc); lc++)
115 verify_futex_wake();
116
117 tst_exit();
118 }
119