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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 | static void | |
21 | AfsWaitHack(struct trb *trb) | |
22 | { | |
23 | #if 0 | |
24 | /* this gets called at interrupt context; let's not tempt fate... */ | |
25 | AFS_STATCNT(WaitHack); | |
26 | #endif | |
27 | ||
28 | e_clear_wait(trb->func_data, THREAD_TIMED_OUT); | |
29 | } | |
30 | ||
31 | void | |
32 | afs_osi_InitWaitHandle(struct afs_osi_WaitHandle *achandle) | |
33 | { | |
34 | AFS_STATCNT(osi_InitWaitHandle); | |
35 | achandle->proc = (caddr_t) 0; | |
36 | } | |
37 | ||
38 | /* cancel osi_Wait */ | |
39 | void | |
40 | afs_osi_CancelWait(struct afs_osi_WaitHandle *achandle) | |
41 | { | |
42 | caddr_t proc; | |
43 | ||
44 | AFS_STATCNT(osi_CancelWait); | |
45 | proc = achandle->proc; | |
46 | if (proc == 0) | |
47 | return; | |
48 | achandle->proc = (caddr_t) 0; /* so dude can figure out he was signalled */ | |
49 | afs_osi_Wakeup(&waitV); | |
50 | } | |
51 | ||
52 | /* afs_osi_Wait | |
53 | * Waits for data on ahandle, or ams ms later. ahandle may be null. | |
54 | * Returns 0 if timeout and EINTR if signalled. | |
55 | */ | |
56 | int | |
57 | afs_osi_Wait(afs_int32 ams, struct afs_osi_WaitHandle *ahandle, int aintok) | |
58 | { | |
59 | int code; | |
60 | afs_int32 endTime, tid; | |
61 | ||
62 | AFS_STATCNT(osi_Wait); | |
63 | endTime = osi_Time() + (ams / 1000); | |
64 | if (ahandle) | |
65 | ahandle->proc = (caddr_t) thread_self(); | |
66 | do { | |
67 | AFS_ASSERT_GLOCK(); | |
68 | code = 0; | |
69 | code = afs_osi_TimedSleep(&waitV, ams, aintok); | |
70 | ||
71 | if (code) | |
72 | break; /* if something happened, quit now */ | |
73 | /* if we we're cancelled, quit now */ | |
74 | if (ahandle && (ahandle->proc == (caddr_t) 0)) { | |
75 | /* we've been signalled */ | |
76 | break; | |
77 | } | |
78 | } while (osi_Time() < endTime); | |
79 | return code; | |
80 | } | |
81 | ||
82 | ||
83 | ||
84 | ||
85 | afs_event_t *afs_evhasht[AFS_EVHASHSIZE]; /* Hash table for events */ | |
86 | #define afs_evhash(event) (afs_uint32) ((((long)event)>>2) & (AFS_EVHASHSIZE-1)) | |
87 | int afs_evhashcnt = 0; | |
88 | ||
89 | /* Get and initialize event structure corresponding to lwp event (i.e. address) | |
90 | * */ | |
91 | static afs_event_t * | |
92 | afs_getevent(char *event) | |
93 | { | |
94 | afs_event_t *evp, *newp = 0; | |
95 | int hashcode; | |
96 | ||
97 | AFS_ASSERT_GLOCK(); | |
98 | hashcode = afs_evhash(event); | |
99 | evp = afs_evhasht[hashcode]; | |
100 | while (evp) { | |
101 | if (evp->event == event) { | |
102 | evp->refcount++; | |
103 | return evp; | |
104 | } | |
105 | if (evp->refcount == 0) | |
106 | newp = evp; | |
107 | evp = evp->next; | |
108 | } | |
109 | if (!newp) { | |
110 | newp = (afs_event_t *) xmalloc(sizeof(afs_event_t), 5, pinned_heap); | |
111 | afs_evhashcnt++; | |
112 | newp->next = afs_evhasht[hashcode]; | |
113 | afs_evhasht[hashcode] = newp; | |
114 | newp->cond = EVENT_NULL; | |
115 | newp->seq = 0; | |
116 | } | |
117 | newp->event = event; | |
118 | newp->refcount = 1; | |
119 | return newp; | |
120 | } | |
121 | ||
122 | /* Release the specified event */ | |
123 | #define relevent(evp) ((evp)->refcount--) | |
124 | ||
125 | ||
126 | void | |
127 | afs_osi_Sleep(void *event) | |
128 | { | |
129 | struct afs_event *evp; | |
130 | int seq; | |
131 | ||
132 | evp = afs_getevent(event); | |
133 | seq = evp->seq; | |
134 | while (seq == evp->seq) { | |
135 | AFS_ASSERT_GLOCK(); | |
136 | e_assert_wait(&evp->cond, 0); | |
137 | AFS_GUNLOCK(); | |
138 | e_block_thread(); | |
139 | AFS_GLOCK(); | |
140 | } | |
141 | relevent(evp); | |
142 | } | |
143 | ||
144 | int | |
145 | afs_osi_SleepSig(void *event) | |
146 | { | |
147 | afs_osi_Sleep(event); | |
148 | return 0; | |
149 | } | |
150 | ||
151 | /* afs_osi_TimedSleep | |
152 | * | |
153 | * Arguments: | |
154 | * event - event to sleep on | |
155 | * ams --- max sleep time in milliseconds | |
156 | * aintok - 1 if should sleep interruptibly | |
157 | * | |
158 | * Returns 0 if timeout and EINTR if signalled. | |
159 | */ | |
160 | int | |
161 | afs_osi_TimedSleep(void *event, afs_int32 ams, int aintok) | |
162 | { | |
163 | int code = 0; | |
164 | struct afs_event *evp; | |
165 | struct timestruc_t ticks; | |
166 | struct trb *trb; | |
167 | int rc; | |
168 | ||
169 | ticks.tv_sec = ams / 1000; | |
170 | ticks.tv_nsec = (ams - (ticks.tv_sec * 1000)) * 1000000; | |
171 | ||
172 | ||
173 | evp = afs_getevent(event); | |
174 | ||
175 | trb = talloc(); | |
176 | if (trb == NULL) | |
177 | osi_Panic("talloc returned NULL"); | |
178 | trb->flags = 0; | |
179 | trb->func = AfsWaitHack; | |
180 | trb->eventlist = EVENT_NULL; | |
181 | trb->ipri = INTTIMER; | |
182 | trb->func_data = thread_self(); | |
183 | trb->timeout.it_value = ticks; | |
184 | ||
185 | e_assert_wait(&evp->cond, aintok); | |
186 | AFS_GUNLOCK(); | |
187 | tstart(trb); | |
188 | rc = e_block_thread(); | |
189 | while (tstop(trb)); | |
190 | if (rc == THREAD_INTERRUPTED) | |
191 | code = EINTR; | |
192 | tfree(trb); | |
193 | AFS_GLOCK(); | |
194 | ||
195 | relevent(evp); | |
196 | return code; | |
197 | } | |
198 | ||
199 | ||
200 | int | |
201 | afs_osi_Wakeup(void *event) | |
202 | { | |
203 | int ret = 1; | |
204 | struct afs_event *evp; | |
205 | ||
206 | evp = afs_getevent(event); | |
207 | if (evp->refcount > 1) { | |
208 | evp->seq++; | |
209 | e_wakeup(&evp->cond); | |
210 | ret = 0; | |
211 | } | |
212 | relevent(evp); | |
213 | return ret; | |
214 | } |