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"
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 #include "osi_compat.h"
19 static char waitV
, dummyV
;
22 afs_osi_InitWaitHandle(struct afs_osi_WaitHandle
*achandle
)
24 AFS_STATCNT(osi_InitWaitHandle
);
25 achandle
->proc
= (caddr_t
) 0;
30 afs_osi_CancelWait(struct afs_osi_WaitHandle
*achandle
)
34 AFS_STATCNT(osi_CancelWait
);
35 proc
= achandle
->proc
;
38 achandle
->proc
= (caddr_t
) 0; /* so dude can figure out he was signalled */
39 afs_osi_Wakeup(&waitV
);
43 * Waits for data on ahandle, or ams ms later. ahandle may be null.
44 * Returns 0 if timeout and EINTR if signalled.
47 afs_osi_Wait(afs_int32 ams
, struct afs_osi_WaitHandle
*ahandle
, int aintok
)
52 AFS_STATCNT(osi_Wait
);
53 endTime
= osi_Time() + (ams
/ 1000);
55 ahandle
->proc
= (caddr_t
) current
;
59 code
= afs_osi_TimedSleep(&waitV
, ams
, 1);
62 if (ahandle
&& (ahandle
->proc
== (caddr_t
) 0)) {
63 /* we've been signalled */
66 } while (osi_Time() < endTime
);
70 afs_event_t
*afs_evhasht
[AFS_EVHASHSIZE
]; /* Hash table for events */
71 #define afs_evhash(event) (afs_uint32) ((((long)event)>>2) & (AFS_EVHASHSIZE-1))
72 int afs_evhashcnt
= 0;
74 /* Get and initialize event structure corresponding to lwp event (i.e. address)
77 afs_getevent(char *event
)
79 afs_event_t
*evp
, *newp
= 0;
83 hashcode
= afs_evhash(event
);
84 evp
= afs_evhasht
[hashcode
];
86 if (evp
->event
== event
) {
90 if (evp
->refcount
== 0)
102 /* afs_addevent -- allocates a new event for the address. It isn't returned;
103 * instead, afs_getevent should be called again. Thus, the real effect of
104 * this routine is to add another event to the hash bucket for this
108 * Called with GLOCK held.
112 afs_addevent(char *event
)
118 hashcode
= afs_evhash(event
);
119 newp
= kzalloc(sizeof(afs_event_t
), GFP_NOFS
);
121 newp
->next
= afs_evhasht
[hashcode
];
122 afs_evhasht
[hashcode
] = newp
;
123 init_waitqueue_head(&newp
->cond
);
124 newp
->event
= &dummyV
; /* Dummy address for new events */
127 #ifndef set_current_state
128 #define set_current_state(x) current->state = (x)
131 /* Release the specified event */
132 #define relevent(evp) ((evp)->refcount--)
136 * Waits for an event to be notified, returning early if a signal
137 * is received. Returns EINTR if signaled, and 0 otherwise.
140 afs_osi_SleepSig(void *event
)
142 struct afs_event
*evp
;
146 evp
= afs_getevent(event
);
149 evp
= afs_getevent(event
);
155 code
= wait_event_freezable(evp
->cond
, seq
!= evp
->seq
);
158 if (code
== -ERESTARTSYS
)
167 /* afs_osi_Sleep -- waits for an event to be notified, ignoring signals.
168 * - NOTE: that on Linux, there are circumstances in which TASK_INTERRUPTIBLE
169 * can wake up, even if all signals are blocked
170 * - TODO: handle signals correctly by passing an indication back to the
171 * caller that the wait has been interrupted and the stack should be cleaned
172 * up preparatory to signal delivery
175 afs_osi_Sleep(void *event
)
180 saved_set
= current
->blocked
;
181 sigfillset(¤t
->blocked
);
182 RECALC_SIGPENDING(current
);
185 afs_osi_SleepSig(event
);
188 current
->blocked
= saved_set
;
189 RECALC_SIGPENDING(current
);
193 /* afs_osi_TimedSleep
196 * event - event to sleep on
197 * ams --- max sleep time in milliseconds
198 * aintok - 1 if should sleep interruptibly
200 * Returns 0 if timeout, EINTR if signalled, and EGAIN if it might
204 afs_osi_TimedSleep(void *event
, afs_int32 ams
, int aintok
)
207 long ticks
= (ams
* HZ
/ 1000) + 1;
208 struct afs_event
*evp
;
211 evp
= afs_getevent(event
);
214 evp
= afs_getevent(event
);
220 code
= wait_event_freezable_timeout(evp
->cond
, evp
->seq
!= seq
, ticks
);
222 if (code
== -ERESTARTSYS
)
234 afs_osi_Wakeup(void *event
)
237 struct afs_event
*evp
;
239 evp
= afs_getevent(event
);
240 if (!evp
) /* No sleepers */
243 if (evp
->refcount
> 1) {