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1/* Copyright (C) 2002-2019 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library 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 GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <http://www.gnu.org/licenses/>. */
18
19#include <errno.h>
20#include <pthread.h>
21#include <stdint.h>
22#include <stdio.h>
23#include <stdlib.h>
24#include <string.h>
25#include <unistd.h>
26#include <sys/mman.h>
27#include <sys/wait.h>
28
29
30static int
31do_test (void)
32{
33 size_t ps = sysconf (_SC_PAGESIZE);
34 char tmpfname[] = "/tmp/tst-spin2.XXXXXX";
35 char data[ps];
36 void *mem;
37 int fd;
38 pthread_spinlock_t *s;
39 pid_t pid;
40 char *p;
41 int err;
42
43 fd = mkstemp (tmpfname);
44 if (fd == -1)
45 {
46 printf ("cannot open temporary file: %m\n");
47 return 1;
48 }
49
50 /* Make sure it is always removed. */
51 unlink (tmpfname);
52
53 /* Create one page of data. */
54 memset (data, '\0', ps);
55
56 /* Write the data to the file. */
57 if (write (fd, data, ps) != (ssize_t) ps)
58 {
59 puts ("short write");
60 return 1;
61 }
62
63 mem = mmap (NULL, ps, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
64 if (mem == MAP_FAILED)
65 {
66 printf ("mmap failed: %m\n");
67 return 1;
68 }
69
70 s = (pthread_spinlock_t *) (((uintptr_t) mem
71 + __alignof (pthread_spinlock_t))
72 & ~(__alignof (pthread_spinlock_t) - 1));
73 p = (char *) (s + 1);
74
75 if (pthread_spin_init (s, PTHREAD_PROCESS_SHARED) != 0)
76 {
77 puts ("spin_init failed");
78 return 1;
79 }
80
81 if (pthread_spin_lock (s) != 0)
82 {
83 puts ("spin_lock failed");
84 return 1;
85 }
86
87 err = pthread_spin_trylock (s);
88 if (err == 0)
89 {
90 puts ("1st spin_trylock succeeded");
91 return 1;
92 }
93 else if (err != EBUSY)
94 {
95 puts ("1st spin_trylock didn't return EBUSY");
96 return 1;
97 }
98
99 err = pthread_spin_unlock (s);
100 if (err != 0)
101 {
102 puts ("parent: spin_unlock failed");
103 return 1;
104 }
105
106 err = pthread_spin_trylock (s);
107 if (err != 0)
108 {
109 puts ("2nd spin_trylock failed");
110 return 1;
111 }
112
113 *p = 0;
114
115 puts ("going to fork now");
116 pid = fork ();
117 if (pid == -1)
118 {
119 puts ("fork failed");
120 return 1;
121 }
122 else if (pid == 0)
123 {
124 /* Play some lock ping-pong. It's our turn to unlock first. */
125 if ((*p)++ != 0)
126 {
127 puts ("child: *p != 0");
128 return 1;
129 }
130
131 if (pthread_spin_unlock (s) != 0)
132 {
133 puts ("child: 1st spin_unlock failed");
134 return 1;
135 }
136
137 puts ("child done");
138 }
139 else
140 {
141 if (pthread_spin_lock (s) != 0)
142 {
143 puts ("parent: 2nd spin_lock failed");
144 return 1;
145 }
146
147 puts ("waiting for child");
148
149 waitpid (pid, NULL, 0);
150
151 puts ("parent done");
152 }
153
154 return 0;
155}
156
157#define TEST_FUNCTION do_test ()
158#include "../test-skeleton.c"
159

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