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805e021f CE |
1 | /* |
2 | * Copyright 2000, International Business Machines Corporation and others. | |
3 | * All Rights Reserved. | |
4 | * | |
5 | * This software has been released under the terms of the IBM Public | |
6 | * License. For details, see the LICENSE file in the top-level source | |
7 | * directory or online at http://www.openafs.org/dl/license10.html | |
8 | */ | |
9 | ||
10 | #include <afsconfig.h> | |
11 | #include "afs/param.h" | |
12 | ||
13 | ||
14 | #include "afs/sysincludes.h" /* Standard vendor system headers */ | |
15 | #include "afsincludes.h" /* Afs-based standard headers */ | |
16 | #include "afs/afs_stats.h" /* afs statistics */ | |
17 | ||
18 | static char waitV; | |
19 | ||
20 | void | |
21 | afs_osi_InitWaitHandle(struct afs_osi_WaitHandle *achandle) | |
22 | { | |
23 | AFS_STATCNT(osi_InitWaitHandle); | |
24 | achandle->proc = (caddr_t) 0; | |
25 | } | |
26 | ||
27 | /* cancel osi_Wait */ | |
28 | void | |
29 | afs_osi_CancelWait(struct afs_osi_WaitHandle *achandle) | |
30 | { | |
31 | caddr_t proc; | |
32 | ||
33 | AFS_STATCNT(osi_CancelWait); | |
34 | proc = achandle->proc; | |
35 | if (proc == 0) | |
36 | return; | |
37 | achandle->proc = (caddr_t) 0; /* so dude can figure out he was signalled */ | |
38 | afs_osi_Wakeup(&waitV); | |
39 | } | |
40 | ||
41 | /* afs_osi_Wait | |
42 | * Waits for data on ahandle, or ams ms later. ahandle may be null. | |
43 | * Returns 0 if timeout and EINTR if signalled. | |
44 | */ | |
45 | int | |
46 | afs_osi_Wait(afs_int32 ams, struct afs_osi_WaitHandle *ahandle, int aintok) | |
47 | { | |
48 | int code; | |
49 | afs_int32 endTime, tid; | |
50 | ||
51 | AFS_STATCNT(osi_Wait); | |
52 | endTime = osi_Time() + (ams / 1000); | |
53 | if (ahandle) | |
54 | ahandle->proc = (caddr_t) curthreadp; | |
55 | do { | |
56 | AFS_ASSERT_GLOCK(); | |
57 | code = 0; | |
58 | code = afs_osi_TimedSleep(&waitV, ams, aintok); | |
59 | ||
60 | if (code) | |
61 | break; /* if something happened, quit now */ | |
62 | /* if we we're cancelled, quit now */ | |
63 | if (ahandle && (ahandle->proc == (caddr_t) 0)) { | |
64 | /* we've been signalled */ | |
65 | break; | |
66 | } | |
67 | } while (osi_Time() < endTime); | |
68 | return code; | |
69 | } | |
70 | ||
71 | ||
72 | ||
73 | ||
74 | afs_event_t *afs_evhasht[AFS_EVHASHSIZE]; /* Hash table for events */ | |
75 | #if (_MIPS_SZPTR == 64) | |
76 | #define afs_evhash(event) (afs_uint32) ((((long)event)>>3) & (AFS_EVHASHSIZE-1)) | |
77 | #else | |
78 | #define afs_evhash(event) (afs_uint32) ((((long)event)>>2) & (AFS_EVHASHSIZE-1)) | |
79 | #endif | |
80 | int afs_evhashcnt = 0; | |
81 | ||
82 | /* Get and initialize event structure corresponding to lwp event (i.e. address) | |
83 | * */ | |
84 | static afs_event_t * | |
85 | afs_getevent(char *event) | |
86 | { | |
87 | afs_event_t *evp, *newp = 0; | |
88 | int hashcode; | |
89 | ||
90 | AFS_ASSERT_GLOCK(); | |
91 | hashcode = afs_evhash(event); | |
92 | evp = afs_evhasht[hashcode]; | |
93 | while (evp) { | |
94 | if (evp->event == event) { | |
95 | evp->refcount++; | |
96 | return evp; | |
97 | } | |
98 | if (evp->refcount == 0) | |
99 | newp = evp; | |
100 | evp = evp->next; | |
101 | } | |
102 | if (!newp) { | |
103 | newp = osi_AllocSmallSpace(sizeof(afs_event_t)); | |
104 | afs_evhashcnt++; | |
105 | newp->next = afs_evhasht[hashcode]; | |
106 | afs_evhasht[hashcode] = newp; | |
107 | cv_init(&newp->cond, "event cond var", CV_DEFAULT, NULL); | |
108 | newp->seq = 0; | |
109 | } | |
110 | newp->event = event; | |
111 | newp->refcount = 1; | |
112 | return newp; | |
113 | } | |
114 | ||
115 | /* Release the specified event */ | |
116 | #define relevent(evp) ((evp)->refcount--) | |
117 | ||
118 | ||
119 | void | |
120 | afs_osi_Sleep(void *event) | |
121 | { | |
122 | struct afs_event *evp; | |
123 | int seq; | |
124 | ||
125 | evp = afs_getevent(event); | |
126 | seq = evp->seq; | |
127 | while (seq == evp->seq) { | |
128 | AFS_ASSERT_GLOCK(); | |
129 | cv_wait(&evp->cond, &afs_global_lock); | |
130 | } | |
131 | relevent(evp); | |
132 | } | |
133 | ||
134 | int | |
135 | afs_osi_SleepSig(void *event) | |
136 | { | |
137 | afs_osi_Sleep(event); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* afs_osi_TimedSleep | |
142 | * | |
143 | * Arguments: | |
144 | * event - event to sleep on | |
145 | * ams --- max sleep time in milliseconds | |
146 | * aintok - 1 if should sleep interruptibly | |
147 | * | |
148 | * Returns 0 if timeout and EINTR if signalled. | |
149 | */ | |
150 | int | |
151 | afs_osi_TimedSleep(void *event, afs_int32 ams, int aintok) | |
152 | { | |
153 | int code = 0; | |
154 | struct afs_event *evp; | |
155 | struct timespec ticks; | |
156 | ||
157 | ticks.tv_sec = ams / 1000; | |
158 | ticks.tv_nsec = (ams - (ticks.tv_sec * 1000)) * 1000000; | |
159 | ||
160 | evp = afs_getevent(event); | |
161 | ||
162 | AFS_ASSERT_GLOCK(); | |
163 | if (aintok) { | |
164 | if (sv_timedwait_sig | |
165 | (&evp->cond, AFSD_PRI(), &afs_global_lock, 0, 0, &ticks, | |
166 | (struct timespec *)0)) | |
167 | code = EINTR; | |
168 | AFS_MUTEX_ENTER(&afs_global_lock); | |
169 | } else { | |
170 | cv_timedwait(&evp->cond, &afs_global_lock, ticks); | |
171 | } | |
172 | ||
173 | relevent(evp); | |
174 | return code; | |
175 | } | |
176 | ||
177 | ||
178 | int | |
179 | afs_osi_Wakeup(void *event) | |
180 | { | |
181 | int ret = 1; | |
182 | struct afs_event *evp; | |
183 | ||
184 | evp = afs_getevent(event); | |
185 | if (evp->refcount > 1) { | |
186 | evp->seq++; | |
187 | cv_broadcast(&evp->cond); | |
188 | ret = 0; | |
189 | } | |
190 | relevent(evp); | |
191 | return ret; | |
192 | } |