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2aa62f2b | 1 | /* $NetBSD: flockfile.c,v 1.8 2003/07/22 00:56:25 nathanw Exp $ */\r |
2 | \r | |
3 | /*-\r | |
4 | * Copyright (c) 2002 The NetBSD Foundation, Inc.\r | |
5 | * All rights reserved.\r | |
6 | *\r | |
7 | * This code is derived from software contributed to The NetBSD Foundation\r | |
8 | * by Nathan J. Williams.\r | |
9 | *\r | |
10 | * Redistribution and use in source and binary forms, with or without\r | |
11 | * modification, are permitted provided that the following conditions\r | |
12 | * are met:\r | |
13 | * 1. Redistributions of source code must retain the above copyright\r | |
14 | * notice, this list of conditions and the following disclaimer.\r | |
15 | * 2. Redistributions in binary form must reproduce the above copyright\r | |
16 | * notice, this list of conditions and the following disclaimer in the\r | |
17 | * documentation and/or other materials provided with the distribution.\r | |
18 | * 3. All advertising materials mentioning features or use of this software\r | |
19 | * must display the following acknowledgement:\r | |
20 | * This product includes software developed by the NetBSD\r | |
21 | * Foundation, Inc. and its contributors.\r | |
22 | * 4. Neither the name of The NetBSD Foundation nor the names of its\r | |
23 | * contributors may be used to endorse or promote products derived\r | |
24 | * from this software without specific prior written permission.\r | |
25 | *\r | |
26 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS\r | |
27 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED\r | |
28 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR\r | |
29 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS\r | |
30 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\r | |
31 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\r | |
32 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\r | |
33 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\r | |
34 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\r | |
35 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\r | |
36 | * POSSIBILITY OF SUCH DAMAGE.\r | |
37 | */\r | |
38 | #include <LibConfig.h>\r | |
39 | #include <sys/EfiCdefs.h>\r | |
40 | #if defined(LIBC_SCCS) && !defined(lint)\r | |
41 | __RCSID("$NetBSD: flockfile.c,v 1.8 2003/07/22 00:56:25 nathanw Exp $");\r | |
42 | #endif /* LIBC_SCCS and not lint */\r | |
43 | \r | |
44 | #include "namespace.h"\r | |
45 | \r | |
46 | #include <assert.h>\r | |
47 | #include <errno.h>\r | |
48 | #include <stdio.h>\r | |
49 | #include <string.h>\r | |
50 | #include "reentrant.h"\r | |
51 | #include "local.h"\r | |
52 | \r | |
53 | #ifdef __weak_alias\r | |
54 | __weak_alias(flockfile,_flockfile)\r | |
55 | __weak_alias(ftrylockfile,_ftrylockfile)\r | |
56 | __weak_alias(funlockfile,_funlockfile)\r | |
57 | #endif\r | |
58 | \r | |
59 | #ifdef _REENTRANT\r | |
60 | /*\r | |
61 | * XXX This code makes the assumption that a thr_t (pthread_t) is a\r | |
62 | * XXX pointer.\r | |
63 | */\r | |
64 | \r | |
65 | extern int __isthreaded;\r | |
66 | \r | |
67 | void\r | |
68 | flockfile(FILE *fp)\r | |
69 | {\r | |
70 | \r | |
71 | __flockfile_internal(fp, 0);\r | |
72 | }\r | |
73 | \r | |
74 | int\r | |
75 | ftrylockfile(FILE *fp)\r | |
76 | {\r | |
77 | int retval;\r | |
78 | \r | |
79 | if (__isthreaded == 0)\r | |
80 | return 0;\r | |
81 | \r | |
82 | retval = 0;\r | |
83 | mutex_lock(&_LOCK(fp));\r | |
84 | \r | |
85 | if (_LOCKOWNER(fp) == thr_self()) {\r | |
86 | _LOCKCOUNT(fp)++;\r | |
87 | } else if (_LOCKOWNER(fp) == NULL) {\r | |
88 | _LOCKOWNER(fp) = thr_self();\r | |
89 | _LOCKCOUNT(fp) = 1;\r | |
90 | } else\r | |
91 | retval = -1;\r | |
92 | \r | |
93 | mutex_unlock(&_LOCK(fp));\r | |
94 | \r | |
95 | return retval;\r | |
96 | }\r | |
97 | \r | |
98 | void\r | |
99 | funlockfile(FILE *fp)\r | |
100 | {\r | |
101 | \r | |
102 | __funlockfile_internal(fp, 0);\r | |
103 | }\r | |
104 | \r | |
105 | void\r | |
106 | __flockfile_internal(FILE *fp, int internal)\r | |
107 | {\r | |
108 | \r | |
109 | if (__isthreaded == 0)\r | |
110 | return;\r | |
111 | \r | |
112 | mutex_lock(&_LOCK(fp));\r | |
113 | \r | |
114 | if (_LOCKOWNER(fp) == thr_self()) {\r | |
115 | _LOCKCOUNT(fp)++;\r | |
116 | if (internal)\r | |
117 | _LOCKINTERNAL(fp)++;\r | |
118 | } else {\r | |
119 | /* danger! cond_wait() is a cancellation point. */\r | |
120 | int oldstate;\r | |
121 | thr_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate);\r | |
122 | while (_LOCKOWNER(fp) != NULL)\r | |
123 | cond_wait(&_LOCKCOND(fp), &_LOCK(fp));\r | |
124 | thr_setcancelstate(oldstate, NULL);\r | |
125 | _LOCKOWNER(fp) = thr_self();\r | |
126 | _LOCKCOUNT(fp) = 1;\r | |
127 | if (internal)\r | |
128 | _LOCKINTERNAL(fp) = 1;\r | |
129 | }\r | |
130 | \r | |
131 | if (_LOCKINTERNAL(fp) == 1)\r | |
132 | /* stash cancellation state and disable */\r | |
133 | thr_setcancelstate(PTHREAD_CANCEL_DISABLE,\r | |
134 | &_LOCKCANCELSTATE(fp));\r | |
135 | \r | |
136 | mutex_unlock(&_LOCK(fp));\r | |
137 | }\r | |
138 | \r | |
139 | void\r | |
140 | __funlockfile_internal(FILE *fp, int internal)\r | |
141 | {\r | |
142 | \r | |
143 | if (__isthreaded == 0)\r | |
144 | return;\r | |
145 | \r | |
146 | mutex_lock(&_LOCK(fp));\r | |
147 | \r | |
148 | if (internal) {\r | |
149 | _LOCKINTERNAL(fp)--;\r | |
150 | if (_LOCKINTERNAL(fp) == 0)\r | |
151 | thr_setcancelstate(_LOCKCANCELSTATE(fp), NULL);\r | |
152 | }\r | |
153 | \r | |
154 | _LOCKCOUNT(fp)--;\r | |
155 | if (_LOCKCOUNT(fp) == 0) {\r | |
156 | _LOCKOWNER(fp) = NULL;\r | |
157 | cond_signal(&_LOCKCOND(fp));\r | |
158 | }\r | |
159 | \r | |
160 | mutex_unlock(&_LOCK(fp));\r | |
161 | }\r | |
162 | \r | |
163 | #else /* _REENTRANT */\r | |
164 | \r | |
165 | void\r | |
166 | flockfile(FILE *fp)\r | |
167 | {\r | |
168 | /* LINTED deliberate lack of effect */\r | |
169 | (void)fp;\r | |
170 | \r | |
171 | return;\r | |
172 | }\r | |
173 | \r | |
174 | int\r | |
175 | ftrylockfile(FILE *fp)\r | |
176 | {\r | |
177 | /* LINTED deliberate lack of effect */\r | |
178 | (void)fp;\r | |
179 | \r | |
180 | return (0);\r | |
181 | }\r | |
182 | \r | |
183 | void\r | |
184 | funlockfile(FILE *fp)\r | |
185 | {\r | |
186 | /* LINTED deliberate lack of effect */\r | |
187 | (void)fp;\r | |
188 | \r | |
189 | return;\r | |
190 | }\r | |
191 | \r | |
192 | #endif /* _REENTRANT */\r |