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1 office 1 /**
2 * @file BLockReactor.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29  
30 #include <misc/debug.h>
31 #include <misc/offset.h>
32 #include <base/BLog.h>
33  
34 #include "BLockReactor.h"
35  
36 #include <generated/blog_channel_BLockReactor.h>
37  
38 static void thread_signal_handler (BThreadSignal *thread_signal)
39 {
40 BLockReactor *o = UPPER_OBJECT(thread_signal, BLockReactor, thread_signal);
41 DebugObject_Access(&o->d_obj);
42  
43 ASSERT_FORCE(sem_post(&o->sem1) == 0)
44 ASSERT_FORCE(sem_wait(&o->sem2) == 0)
45 }
46  
47 int BLockReactor_Init (BLockReactor *o, BReactor *reactor)
48 {
49 o->reactor = reactor;
50  
51 if (!BThreadSignal_Init(&o->thread_signal, reactor, thread_signal_handler)) {
52 BLog(BLOG_ERROR, "BThreadSignal_Init failed");
53 goto fail0;
54 }
55  
56 if (sem_init(&o->sem1, 0, 0) < 0) {
57 BLog(BLOG_ERROR, "sem_init failed");
58 goto fail1;
59 }
60  
61 if (sem_init(&o->sem2, 0, 0) < 0) {
62 BLog(BLOG_ERROR, "sem_init failed");
63 goto fail2;
64 }
65  
66 #ifndef NDEBUG
67 o->locked = 0;
68 #endif
69  
70 DebugObject_Init(&o->d_obj);
71 return 1;
72  
73 fail2:
74 if (sem_close(&o->sem1) < 0) {
75 BLog(BLOG_ERROR, "sem_close failed");
76 }
77 fail1:
78 BThreadSignal_Free(&o->thread_signal);
79 fail0:
80 return 0;
81 }
82  
83 void BLockReactor_Free (BLockReactor *o)
84 {
85 DebugObject_Free(&o->d_obj);
86 #ifndef NDEBUG
87 ASSERT(!o->locked)
88 #endif
89  
90 if (sem_destroy(&o->sem2) < 0) {
91 BLog(BLOG_ERROR, "sem_close failed");
92 }
93 if (sem_destroy(&o->sem1) < 0) {
94 BLog(BLOG_ERROR, "sem_close failed");
95 }
96 BThreadSignal_Free(&o->thread_signal);
97 }
98  
99 int BLockReactor_Thread_Lock (BLockReactor *o)
100 {
101 DebugObject_Access(&o->d_obj);
102 #ifndef NDEBUG
103 ASSERT(!o->locked)
104 #endif
105  
106 if (!BThreadSignal_Thread_Signal(&o->thread_signal)) {
107 return 0;
108 }
109  
110 ASSERT_FORCE(sem_wait(&o->sem1) == 0)
111  
112 #ifndef NDEBUG
113 o->locked = 1;
114 #endif
115  
116 return 1;
117 }
118  
119 void BLockReactor_Thread_Unlock (BLockReactor *o)
120 {
121 DebugObject_Access(&o->d_obj);
122 #ifndef NDEBUG
123 ASSERT(o->locked)
124 #endif
125  
126 #ifndef NDEBUG
127 o->locked = 0;
128 #endif
129  
130 ASSERT_FORCE(sem_post(&o->sem2) == 0)
131 }