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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 | ||
11 | #include <afsconfig.h> | |
12 | #include "afs/param.h" | |
13 | ||
14 | ||
15 | #include "afs/sysincludes.h" /* Standard vendor system headers */ | |
16 | #include "afsincludes.h" /* Afs-based standard headers */ | |
17 | #include "afs/afs_stats.h" /* afs statistics */ | |
18 | ||
19 | void | |
20 | afs_osi_InitWaitHandle(struct afs_osi_WaitHandle *achandle) | |
21 | { | |
22 | AFS_STATCNT(osi_InitWaitHandle); | |
23 | cv_init(&achandle->wh_condvar, "afscondvar"); | |
24 | achandle->wh_inited = 1; | |
25 | } | |
26 | ||
27 | /* cancel osi_Wait */ | |
28 | /* XXX | |
29 | * I can't tell -- is this supposed to be cv_signal() or cv_waitq_remove()? | |
30 | * Or perhaps cv_broadcast()? | |
31 | * Assuming cv_signal() is the desired meaning. -GAW | |
32 | */ | |
33 | void | |
34 | afs_osi_CancelWait(struct afs_osi_WaitHandle *achandle) | |
35 | { | |
36 | AFS_STATCNT(osi_CancelWait); | |
37 | ||
38 | /* XXX should not be necessary */ | |
39 | if (!achandle->wh_inited) | |
40 | return; | |
41 | AFS_ASSERT_GLOCK(); | |
42 | cv_signal(&achandle->wh_condvar); | |
43 | } | |
44 | ||
45 | /* afs_osi_Wait | |
46 | * Waits for data on ahandle, or ams ms later. ahandle may be null. | |
47 | * Returns 0 if timeout and EINTR if signalled. | |
48 | */ | |
49 | int | |
50 | afs_osi_Wait(afs_int32 ams, struct afs_osi_WaitHandle *ahandle, int aintok) | |
51 | { | |
52 | int code; | |
53 | struct timeval tv; | |
54 | int ticks; | |
55 | ||
56 | AFS_STATCNT(osi_Wait); | |
57 | tv.tv_sec = ams / 1000; | |
58 | tv.tv_usec = (ams % 1000) * 1000; | |
59 | ticks = tvtohz(&tv); | |
60 | ||
61 | AFS_ASSERT_GLOCK(); | |
62 | if (ahandle == NULL) { | |
63 | /* This is nasty and evil and rude. */ | |
64 | code = msleep(&tv, &afs_global_mtx, (aintok ? PPAUSE|PCATCH : PVFS), | |
65 | "afswait", ticks); | |
66 | } else { | |
67 | if (!ahandle->wh_inited) | |
68 | afs_osi_InitWaitHandle(ahandle); /* XXX should not be needed */ | |
69 | if (aintok) | |
70 | code = cv_timedwait_sig(&ahandle->wh_condvar, &afs_global_mtx, | |
71 | ticks); | |
72 | else | |
73 | code = cv_timedwait(&ahandle->wh_condvar, &afs_global_mtx, ticks); | |
74 | } | |
75 | return code; | |
76 | } | |
77 | ||
78 | afs_event_t *afs_evhasht[AFS_EVHASHSIZE]; /* Hash table for events */ | |
79 | #define afs_evhash(event) (afs_uint32) ((((long)event)>>2) & (AFS_EVHASHSIZE-1)) | |
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 = (afs_event_t *) afs_osi_Alloc_NoSleep(sizeof(afs_event_t)); | |
104 | afs_evhashcnt++; | |
105 | newp->next = afs_evhasht[hashcode]; | |
106 | afs_evhasht[hashcode] = newp; | |
107 | newp->seq = 0; | |
108 | } | |
109 | newp->event = event; | |
110 | newp->refcount = 1; | |
111 | return newp; | |
112 | } | |
113 | ||
114 | /* Release the specified event */ | |
115 | #define relevent(evp) ((evp)->refcount--) | |
116 | ||
117 | ||
118 | void | |
119 | afs_osi_Sleep(void *event) | |
120 | { | |
121 | struct afs_event *evp; | |
122 | int seq; | |
123 | ||
124 | evp = afs_getevent(event); | |
125 | seq = evp->seq; | |
126 | while (seq == evp->seq) { | |
127 | AFS_ASSERT_GLOCK(); | |
128 | msleep(event, &afs_global_mtx, PVFS, "afsslp", 0); | |
129 | } | |
130 | relevent(evp); | |
131 | } | |
132 | ||
133 | int | |
134 | afs_osi_SleepSig(void *event) | |
135 | { | |
136 | afs_osi_Sleep(event); | |
137 | return 0; | |
138 | } | |
139 | ||
140 | /* osi_TimedSleep | |
141 | * | |
142 | * Arguments: | |
143 | * event - event to sleep on | |
144 | * ams --- max sleep time in milliseconds | |
145 | * aintok - 1 if should sleep interruptibly | |
146 | * | |
147 | * Returns 0 if timeout and EINTR if signalled. | |
148 | */ | |
149 | int | |
150 | afs_osi_TimedSleep(void *event, afs_int32 ams, int aintok) | |
151 | { | |
152 | struct afs_event *evp; | |
153 | int seq, code; | |
154 | struct timeval tv; | |
155 | int ticks; | |
156 | ||
157 | tv.tv_sec = ams / 1000; | |
158 | tv.tv_usec = (ams % 1000) * 1000; | |
159 | ticks = tvtohz(&tv); | |
160 | ||
161 | evp = afs_getevent(event); | |
162 | seq = evp->seq; | |
163 | while (seq == evp->seq) { | |
164 | AFS_ASSERT_GLOCK(); | |
165 | code = msleep(event, &afs_global_mtx, (aintok ? PPAUSE|PCATCH : PVFS), | |
166 | "afstslp", ticks); | |
167 | if (code == EINTR) | |
168 | break; | |
169 | } | |
170 | relevent(evp); | |
171 | return code; | |
172 | } | |
173 | ||
174 | int | |
175 | afs_osi_Wakeup(void *event) | |
176 | { | |
177 | int ret = 1; | |
178 | struct afs_event *evp; | |
179 | ||
180 | evp = afs_getevent(event); | |
181 | if (evp->refcount > 1) { | |
182 | evp->seq++; | |
183 | wakeup(event); | |
184 | ret = 0; | |
185 | } | |
186 | relevent(evp); | |
187 | return ret; | |
188 | } |