src/afs/SOLARIS/osi_sleep.c

   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) curthread;
  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 #define afs_evhash(event)       (afs_uint32) ((((long)event)>>2) & (AFS_EVHASHSIZE-1))
  76 int afs_evhashcnt = 0;
  77
  78 /* Get and initialize event structure corresponding to lwp event (i.e. address)
  79  * */
  80 static afs_event_t *
  81 afs_getevent(char *event)
  82 {
  83     afs_event_t *evp, *newp = 0;
  84     int hashcode;
  85
  86     AFS_ASSERT_GLOCK();
  87     hashcode = afs_evhash(event);
  88     evp = afs_evhasht[hashcode];
  89     while (evp) {
  90         if (evp->event == event) {
  91             evp->refcount++;
  92             return evp;
  93         }
  94         if (evp->refcount == 0)
  95             newp = evp;
  96         evp = evp->next;
  97     }
  98     if (!newp) {
  99         newp = osi_AllocSmallSpace(sizeof(afs_event_t));
 100         afs_evhashcnt++;
 101         newp->next = afs_evhasht[hashcode];
 102         afs_evhasht[hashcode] = newp;
 103         cv_init(&newp->cond, "event cond var", CV_DEFAULT, NULL);
 104         newp->seq = 0;
 105     }
 106     newp->event = event;
 107     newp->refcount = 1;
 108     return newp;
 109 }
 110
 111 /* Release the specified event */
 112 #define relevent(evp) ((evp)->refcount--)
 113
 114
 115 void
 116 afs_osi_Sleep(void *event)
 117 {
 118     struct afs_event *evp;
 119     int seq;
 120
 121     evp = afs_getevent(event);
 122     seq = evp->seq;
 123     while (seq == evp->seq) {
 124         AFS_ASSERT_GLOCK();
 125         cv_wait(&evp->cond, &afs_global_lock);
 126     }
 127     relevent(evp);
 128 }
 129
 130 int
 131 afs_osi_SleepSig(void *event)
 132 {
 133     struct afs_event *evp;
 134     int seq, code = 0;
 135
 136     evp = afs_getevent(event);
 137     seq = evp->seq;
 138     while (seq == evp->seq) {
 139         AFS_ASSERT_GLOCK();
 140         if (cv_wait_sig(&evp->cond, &afs_global_lock) == 0) {
 141             code = EINTR;
 142             break;
 143         }
 144     }
 145     relevent(evp);
 146     return code;
 147 }
 148
 149 /* afs_osi_TimedSleep
 150  *
 151  * Arguments:
 152  * event - event to sleep on
 153  * ams --- max sleep time in milliseconds
 154  * aintok - 1 if should sleep interruptibly
 155  *
 156  * Returns 0 if timeout and EINTR if signalled.
 157  */
 158 int
 159 afs_osi_TimedSleep(void *event, afs_int32 ams, int aintok)
 160 {
 161     int code = 0;
 162     struct afs_event *evp;
 163     clock_t ticks;
 164
 165     ticks = (ams * afs_hz) / 1000;
 166 #if defined(AFS_SUN510_ENV)
 167     ticks = ticks + ddi_get_lbolt();
 168 #else
 169     ticks = ticks + lbolt;
 170 #endif
 171
 172     evp = afs_getevent(event);
 173
 174     AFS_ASSERT_GLOCK();
 175     if (aintok) {
 176         if (cv_timedwait_sig(&evp->cond, &afs_global_lock, ticks) == 0)
 177             code = EINTR;
 178     } else {
 179         cv_timedwait(&evp->cond, &afs_global_lock, ticks);
 180     }
 181
 182     relevent(evp);
 183     return code;
 184 }
 185
 186
 187 int
 188 afs_osi_Wakeup(void *event)
 189 {
 190     int ret = 1;
 191     struct afs_event *evp;
 192
 193     evp = afs_getevent(event);
 194     if (evp->refcount > 1) {
 195         evp->seq++;
 196         cv_broadcast(&evp->cond);
 197         ret = 0;
 198     }
 199     relevent(evp);
 200     return 0;
 201 }