1/*
2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * POSIX stdio FILE locking functions. These assume that the locking
32 * is only required at FILE structure level, not at file descriptor
33 * level too.
34 *
35 */
36
37#include <sys/cdefs.h>
| 1/*
2 * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the author nor the names of any co-contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30/*
31 * POSIX stdio FILE locking functions. These assume that the locking
32 * is only required at FILE structure level, not at file descriptor
33 * level too.
34 *
35 */
36
37#include <sys/cdefs.h>
|
39
40#include "namespace.h"
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <pthread.h>
45#include "un-namespace.h"
46
47#include "local.h"
48
49
50/*
51 * Weak symbols for externally visible functions in this file:
52 */
53__weak_reference(_flockfile, flockfile);
54__weak_reference(_flockfile_debug_stub, _flockfile_debug);
55__weak_reference(_ftrylockfile, ftrylockfile);
56__weak_reference(_funlockfile, funlockfile);
57
| 39
40#include "namespace.h"
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <pthread.h>
45#include "un-namespace.h"
46
47#include "local.h"
48
49
50/*
51 * Weak symbols for externally visible functions in this file:
52 */
53__weak_reference(_flockfile, flockfile);
54__weak_reference(_flockfile_debug_stub, _flockfile_debug);
55__weak_reference(_ftrylockfile, ftrylockfile);
56__weak_reference(_funlockfile, funlockfile);
57
|
58void
59_flockfile(FILE *fp)
60{
61 pthread_t curthread = _pthread_self();
62
63 if (fp->_fl_owner == curthread)
64 fp->_fl_count++;
65 else {
66 /*
67 * Make sure this mutex is treated as a private
68 * internal mutex:
69 */
70 _pthread_mutex_lock(&fp->_fl_mutex);
71 fp->_fl_owner = curthread;
72 fp->_fl_count = 1;
73 }
74}
75
76/*
77 * This can be overriden by the threads library if it is linked in.
78 */
79void
80_flockfile_debug_stub(FILE *fp, char *fname, int lineno)
81{
82 _flockfile(fp);
83}
84
85int
86_ftrylockfile(FILE *fp)
87{
88 pthread_t curthread = _pthread_self();
89 int ret = 0;
90
91 if (fp->_fl_owner == curthread)
92 fp->_fl_count++;
93 /*
94 * Make sure this mutex is treated as a private
95 * internal mutex:
96 */
97 else if (_pthread_mutex_trylock(&fp->_fl_mutex) == 0) {
98 fp->_fl_owner = curthread;
99 fp->_fl_count = 1;
100 }
101 else
102 ret = -1;
103 return (ret);
104}
105
106void
107_funlockfile(FILE *fp)
108{
109 pthread_t curthread = _pthread_self();
110
111 /*
112 * Check if this file is owned by the current thread:
113 */
114 if (fp->_fl_owner == curthread) {
115 /*
116 * Check if this thread has locked the FILE
117 * more than once:
118 */
119 if (fp->_fl_count > 1)
120 /*
121 * Decrement the count of the number of
122 * times the running thread has locked this
123 * file:
124 */
125 fp->_fl_count--;
126 else {
127 /*
128 * The running thread will release the
129 * lock now:
130 */
131 fp->_fl_count = 0;
132 fp->_fl_owner = NULL;
133 _pthread_mutex_unlock(&fp->_fl_mutex);
134 }
135 }
136}
| 61void
62_flockfile(FILE *fp)
63{
64 pthread_t curthread = _pthread_self();
65
66 if (fp->_fl_owner == curthread)
67 fp->_fl_count++;
68 else {
69 /*
70 * Make sure this mutex is treated as a private
71 * internal mutex:
72 */
73 _pthread_mutex_lock(&fp->_fl_mutex);
74 fp->_fl_owner = curthread;
75 fp->_fl_count = 1;
76 }
77}
78
79/*
80 * This can be overriden by the threads library if it is linked in.
81 */
82void
83_flockfile_debug_stub(FILE *fp, char *fname, int lineno)
84{
85 _flockfile(fp);
86}
87
88int
89_ftrylockfile(FILE *fp)
90{
91 pthread_t curthread = _pthread_self();
92 int ret = 0;
93
94 if (fp->_fl_owner == curthread)
95 fp->_fl_count++;
96 /*
97 * Make sure this mutex is treated as a private
98 * internal mutex:
99 */
100 else if (_pthread_mutex_trylock(&fp->_fl_mutex) == 0) {
101 fp->_fl_owner = curthread;
102 fp->_fl_count = 1;
103 }
104 else
105 ret = -1;
106 return (ret);
107}
108
109void
110_funlockfile(FILE *fp)
111{
112 pthread_t curthread = _pthread_self();
113
114 /*
115 * Check if this file is owned by the current thread:
116 */
117 if (fp->_fl_owner == curthread) {
118 /*
119 * Check if this thread has locked the FILE
120 * more than once:
121 */
122 if (fp->_fl_count > 1)
123 /*
124 * Decrement the count of the number of
125 * times the running thread has locked this
126 * file:
127 */
128 fp->_fl_count--;
129 else {
130 /*
131 * The running thread will release the
132 * lock now:
133 */
134 fp->_fl_count = 0;
135 fp->_fl_owner = NULL;
136 _pthread_mutex_unlock(&fp->_fl_mutex);
137 }
138 }
139}
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