1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
|
// tls_test.cc -- test TLS variables for gold, main function
// Copyright (C) 2006-2019 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
// This is the main function for the TLS test. See tls_test.cc for
// more information.
#include <cassert>
#include <cstdio>
#include <pthread.h>
#include <semaphore.h>
#include "tls_test.h"
// We make these macros so the assert() will give useful line-numbers.
#define safe_lock(semptr) \
do \
{ \
int err = sem_wait(semptr); \
assert(err == 0); \
} \
while (0)
#define safe_unlock(semptr) \
do \
{ \
int err = sem_post(semptr); \
assert(err == 0); \
} \
while (0)
struct Sem_set
{
sem_t sem1;
sem_t sem2;
sem_t sem3;
};
Sem_set sems1;
Sem_set sems2;
bool failed = false;
void
check(const char* name, bool val)
{
if (!val)
{
fprintf(stderr, "Test %s failed\n", name);
failed = true;
}
}
// The body of the thread function. This acquires the first
// semaphore, runs the tests, and then releases the second semaphore.
// Then it acquires the third semaphore, and the runs the verification
// test again.
void*
thread_routine(void* arg)
{
Sem_set* pms = static_cast<Sem_set*>(arg);
// Acquire the first semaphore.
if (pms)
safe_lock(&pms->sem1);
// Run the tests.
check("t1", t1());
check("t2", t2());
check("t3", t3());
check("t4", t4());
f5b(f5a());
check("t5", t5());
f6b(f6a());
check("t6", t6());
check("t8", t8());
check("t9", t9());
f10b(f10a());
check("t10", t10());
check("t11", t11() != 0);
check("t12", t12());
check("t_last", t_last());
// Release the second semaphore.
if (pms)
safe_unlock(&pms->sem2);
// Acquire the third semaphore.
if (pms)
safe_lock(&pms->sem3);
check("t_last", t_last());
return 0;
}
// The main function.
int
main()
{
// First, as a sanity check, run through the tests in the "main" thread.
thread_routine(0);
// Set up the semaphores. We want the first thread to start right
// away, tell us when it is done with the first part, and wait for
// us to release it. We want the second thread to wait to start,
// tell us when it is done with the first part, and wait for us to
// release it.
sem_init(&sems1.sem1, 0, 1);
sem_init(&sems1.sem2, 0, 0);
sem_init(&sems1.sem3, 0, 0);
sem_init(&sems2.sem1, 0, 0);
sem_init(&sems2.sem2, 0, 0);
sem_init(&sems2.sem3, 0, 0);
pthread_t thread1;
int err = pthread_create(&thread1, NULL, thread_routine, &sems1);
assert(err == 0);
pthread_t thread2;
err = pthread_create(&thread2, NULL, thread_routine, &sems2);
assert(err == 0);
// Wait for the first thread to complete the first part.
safe_lock(&sems1.sem2);
// Tell the second thread to start.
safe_unlock(&sems2.sem1);
// Wait for the second thread to complete the first part.
safe_lock(&sems2.sem2);
// Tell the first thread to continue and finish.
safe_unlock(&sems1.sem3);
// Wait for the first thread to finish.
void* thread_val;
err = pthread_join(thread1, &thread_val);
assert(err == 0);
assert(thread_val == 0);
// Tell the second thread to continue and finish.
safe_unlock(&sems2.sem3);
// Wait for the second thread to finish.
err = pthread_join(thread2, &thread_val);
assert(err == 0);
assert(thread_val == 0);
// All done.
return failed ? 1 : 0;
}
|
