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1 | /****************************************************************************** |
2 | * | |
3 | * Copyright © International Business Machines Corp., 2006-2008 | |
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 2 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * DESCRIPTION | |
11 | * This test exercises the futex_wait_requeue_pi() signal handling both | |
12 | * before and after the requeue. The first should be restarted by the | |
13 | * kernel. The latter should return EWOULDBLOCK to the waiter. | |
14 | * | |
15 | * AUTHORS | |
16 | * Darren Hart <dvhart@linux.intel.com> | |
17 | * | |
18 | * HISTORY | |
19 | * 2008-May-5: Initial version by Darren Hart <dvhart@linux.intel.com> | |
20 | * | |
21 | *****************************************************************************/ | |
22 | ||
23 | #include <errno.h> | |
24 | #include <getopt.h> | |
25 | #include <limits.h> | |
26 | #include <pthread.h> | |
27 | #include <signal.h> | |
28 | #include <stdio.h> | |
29 | #include <stdlib.h> | |
30 | #include <string.h> | |
31 | #include "atomic.h" | |
32 | #include "futextest.h" | |
33 | #include "logging.h" | |
34 | ||
35 | #define DELAY_US 100 | |
36 | ||
37 | futex_t f1 = FUTEX_INITIALIZER; | |
38 | futex_t f2 = FUTEX_INITIALIZER; | |
39 | atomic_t requeued = ATOMIC_INITIALIZER; | |
40 | ||
41 | int waiter_ret = 0; | |
42 | ||
43 | void usage(char *prog) | |
44 | { | |
45 | printf("Usage: %s\n", prog); | |
46 | printf(" -c Use color\n"); | |
47 | printf(" -h Display this help message\n"); | |
48 | printf(" -v L Verbosity level: %d=QUIET %d=CRITICAL %d=INFO\n", | |
49 | VQUIET, VCRITICAL, VINFO); | |
50 | } | |
51 | ||
52 | int create_rt_thread(pthread_t *pth, void*(*func)(void *), void *arg, | |
53 | int policy, int prio) | |
54 | { | |
55 | struct sched_param schedp; | |
56 | pthread_attr_t attr; | |
57 | int ret; | |
58 | ||
59 | pthread_attr_init(&attr); | |
60 | memset(&schedp, 0, sizeof(schedp)); | |
61 | ||
62 | ret = pthread_attr_setinheritsched(&attr, PTHREAD_EXPLICIT_SCHED); | |
63 | if (ret) { | |
64 | error("pthread_attr_setinheritsched\n", ret); | |
65 | return -1; | |
66 | } | |
67 | ||
68 | ret = pthread_attr_setschedpolicy(&attr, policy); | |
69 | if (ret) { | |
70 | error("pthread_attr_setschedpolicy\n", ret); | |
71 | return -1; | |
72 | } | |
73 | ||
74 | schedp.sched_priority = prio; | |
75 | ret = pthread_attr_setschedparam(&attr, &schedp); | |
76 | if (ret) { | |
77 | error("pthread_attr_setschedparam\n", ret); | |
78 | return -1; | |
79 | } | |
80 | ||
81 | ret = pthread_create(pth, &attr, func, arg); | |
82 | if (ret) { | |
83 | error("pthread_create\n", ret); | |
84 | return -1; | |
85 | } | |
86 | return 0; | |
87 | } | |
88 | ||
89 | void handle_signal(int signo) | |
90 | { | |
91 | info("signal received %s requeue\n", | |
92 | requeued.val ? "after" : "prior to"); | |
93 | } | |
94 | ||
95 | void *waiterfn(void *arg) | |
96 | { | |
97 | unsigned int old_val; | |
98 | int res; | |
99 | ||
100 | waiter_ret = RET_PASS; | |
101 | ||
102 | info("Waiter running\n"); | |
103 | info("Calling FUTEX_LOCK_PI on f2=%x @ %p\n", f2, &f2); | |
104 | old_val = f1; | |
105 | res = futex_wait_requeue_pi(&f1, old_val, &(f2), NULL, | |
106 | FUTEX_PRIVATE_FLAG); | |
107 | if (!requeued.val || errno != EWOULDBLOCK) { | |
108 | fail("unexpected return from futex_wait_requeue_pi: %d (%s)\n", | |
109 | res, strerror(errno)); | |
110 | info("w2:futex: %x\n", f2); | |
111 | if (!res) | |
112 | futex_unlock_pi(&f2, FUTEX_PRIVATE_FLAG); | |
113 | waiter_ret = RET_FAIL; | |
114 | } | |
115 | ||
116 | info("Waiter exiting with %d\n", waiter_ret); | |
117 | pthread_exit(NULL); | |
118 | } | |
119 | ||
120 | ||
121 | int main(int argc, char *argv[]) | |
122 | { | |
123 | unsigned int old_val; | |
124 | struct sigaction sa; | |
125 | pthread_t waiter; | |
126 | int c, res, ret = RET_PASS; | |
127 | ||
128 | while ((c = getopt(argc, argv, "chv:")) != -1) { | |
129 | switch (c) { | |
130 | case 'c': | |
131 | log_color(1); | |
132 | break; | |
133 | case 'h': | |
134 | usage(basename(argv[0])); | |
135 | exit(0); | |
136 | case 'v': | |
137 | log_verbosity(atoi(optarg)); | |
138 | break; | |
139 | default: | |
140 | usage(basename(argv[0])); | |
141 | exit(1); | |
142 | } | |
143 | } | |
144 | ||
145 | printf("%s: Test signal handling during requeue_pi\n", | |
146 | basename(argv[0])); | |
147 | printf("\tArguments: <none>\n"); | |
148 | ||
149 | sa.sa_handler = handle_signal; | |
150 | sigemptyset(&sa.sa_mask); | |
151 | sa.sa_flags = 0; | |
152 | if (sigaction(SIGUSR1, &sa, NULL)) { | |
153 | error("sigaction\n", errno); | |
154 | exit(1); | |
155 | } | |
156 | ||
157 | info("m1:f2: %x\n", f2); | |
158 | info("Creating waiter\n"); | |
159 | res = create_rt_thread(&waiter, waiterfn, NULL, SCHED_FIFO, 1); | |
160 | if (res) { | |
161 | error("Creating waiting thread failed", res); | |
162 | ret = RET_ERROR; | |
163 | goto out; | |
164 | } | |
165 | ||
166 | info("Calling FUTEX_LOCK_PI on f2=%x @ %p\n", f2, &f2); | |
167 | info("m2:f2: %x\n", f2); | |
168 | futex_lock_pi(&f2, 0, 0, FUTEX_PRIVATE_FLAG); | |
169 | info("m3:f2: %x\n", f2); | |
170 | ||
171 | while (1) { | |
172 | /* | |
173 | * signal the waiter before requeue, waiter should automatically | |
174 | * restart futex_wait_requeue_pi() in the kernel. Wait for the | |
175 | * waiter to block on f1 again. | |
176 | */ | |
177 | info("Issuing SIGUSR1 to waiter\n"); | |
178 | pthread_kill(waiter, SIGUSR1); | |
179 | usleep(DELAY_US); | |
180 | ||
181 | info("Requeueing waiter via FUTEX_CMP_REQUEUE_PI\n"); | |
182 | old_val = f1; | |
183 | res = futex_cmp_requeue_pi(&f1, old_val, &(f2), 1, 0, | |
184 | FUTEX_PRIVATE_FLAG); | |
185 | /* | |
186 | * If res is non-zero, we either requeued the waiter or hit an | |
187 | * error, break out and handle it. If it is zero, then the | |
188 | * signal may have hit before the the waiter was blocked on f1. | |
189 | * Try again. | |
190 | */ | |
191 | if (res > 0) { | |
192 | atomic_set(&requeued, 1); | |
193 | break; | |
194 | } else if (res > 0) { | |
195 | error("FUTEX_CMP_REQUEUE_PI failed\n", errno); | |
196 | ret = RET_ERROR; | |
197 | break; | |
198 | } | |
199 | } | |
200 | info("m4:f2: %x\n", f2); | |
201 | ||
202 | /* | |
203 | * Signal the waiter after requeue, waiter should return from | |
204 | * futex_wait_requeue_pi() with EWOULDBLOCK. Join the thread here so the | |
205 | * futex_unlock_pi() can't happen before the signal wakeup is detected | |
206 | * in the kernel. | |
207 | */ | |
208 | info("Issuing SIGUSR1 to waiter\n"); | |
209 | pthread_kill(waiter, SIGUSR1); | |
210 | info("Waiting for waiter to return\n"); | |
211 | pthread_join(waiter, NULL); | |
212 | ||
213 | info("Calling FUTEX_UNLOCK_PI on mutex=%x @ %p\n", f2, &f2); | |
214 | futex_unlock_pi(&f2, FUTEX_PRIVATE_FLAG); | |
215 | info("m5:f2: %x\n", f2); | |
216 | ||
217 | out: | |
218 | if (ret == RET_PASS && waiter_ret) | |
219 | ret = waiter_ret; | |
220 | ||
221 | print_result(ret); | |
222 | return ret; | |
223 | } |