2 * Copyright 2000, International Business Machines Corporation and others.
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
10 #include <afsconfig.h>
11 #include "../afs/param.h"
15 #include "../afs/sysincludes.h" /* Standard vendor system headers */
16 #include "../afs/afsincludes.h" /* Afs-based standard headers */
17 #include "../afs/afs_stats.h" /* afs statistics */
19 static int osi_TimedSleep(char *event, afs_int32 ams, int aintok);
20 void afs_osi_Wakeup(char *event);
21 void afs_osi_Sleep(char *event);
25 void afs_osi_InitWaitHandle(struct afs_osi_WaitHandle *achandle)
27 AFS_STATCNT(osi_InitWaitHandle);
28 achandle->proc = (caddr_t) 0;
32 void afs_osi_CancelWait(struct afs_osi_WaitHandle *achandle)
36 AFS_STATCNT(osi_CancelWait);
37 proc = achandle->proc;
38 if (proc == 0) return;
39 achandle->proc = (caddr_t) 0; /* so dude can figure out he was signalled */
40 afs_osi_Wakeup(&waitV);
44 * Waits for data on ahandle, or ams ms later. ahandle may be null.
45 * Returns 0 if timeout and EINTR if signalled.
47 int afs_osi_Wait(afs_int32 ams, struct afs_osi_WaitHandle *ahandle, int aintok)
50 afs_int32 endTime, tid;
52 AFS_STATCNT(osi_Wait);
53 endTime = osi_Time() + (ams/1000);
55 ahandle->proc = (caddr_t) curthread;
59 code = osi_TimedSleep(&waitV, ams, aintok);
61 if (code) 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 */
67 } while (osi_Time() < endTime);
74 typedef struct afs_event {
75 struct afs_event *next; /* next in hash chain */
76 char *event; /* lwp event: an address */
77 int refcount; /* Is it in use? */
78 int seq; /* Sequence number: this is incremented
79 by wakeup calls; wait will not return until
81 kcondvar_t cond; /* Currently associated condition variable */
85 afs_event_t *afs_evhasht[HASHSIZE];/* Hash table for events */
86 #define afs_evhash(event) (afs_uint32) ((((long)event)>>2) & (HASHSIZE-1));
87 int afs_evhashcnt = 0;
89 /* Get and initialize event structure corresponding to lwp event (i.e. address)
91 static afs_event_t *afs_getevent(char *event)
93 afs_event_t *evp, *newp = 0;
97 hashcode = afs_evhash(event);
98 evp = afs_evhasht[hashcode];
100 if (evp->event == event) {
104 if (evp->refcount == 0)
109 newp = (afs_event_t *) osi_AllocSmallSpace(sizeof (afs_event_t));
111 newp->next = afs_evhasht[hashcode];
112 afs_evhasht[hashcode] = newp;
113 cv_init(&newp->cond, "event cond var", CV_DEFAULT, NULL);
121 /* Release the specified event */
122 #define relevent(evp) ((evp)->refcount--)
125 void afs_osi_Sleep(char *event)
127 struct afs_event *evp;
130 evp = afs_getevent(event);
132 while (seq == evp->seq) {
134 cv_wait(&evp->cond, &afs_global_lock);
142 * event - event to sleep on
143 * ams --- max sleep time in milliseconds
144 * aintok - 1 if should sleep interruptibly
146 * Returns 0 if timeout and EINTR if signalled.
148 static int osi_TimedSleep(char *event, afs_int32 ams, int aintok)
151 struct afs_event *evp;
154 ticks = ( ams * afs_hz )/1000;
155 ticks = ticks + lbolt;
157 evp = afs_getevent(event);
161 if (cv_timedwait_sig(&evp->cond, &afs_global_lock, ticks) == -1)
164 cv_timedwait(&evp->cond, &afs_global_lock, ticks);
172 void afs_osi_Wakeup(char *event)
174 struct afs_event *evp;
176 evp = afs_getevent(event);
177 if (evp->refcount > 1) {
179 cv_broadcast(&evp->cond);