+++ /dev/null
-/*
- * Copyright 2000, International Business Machines Corporation and others.
- * All Rights Reserved.
- *
- * This software has been released under the terms of the IBM Public
- * License. For details, see the LICENSE file in the top-level source
- * directory or online at http://www.openafs.org/dl/license10.html
- */
-
-#include <afsconfig.h>
-#include "afs/param.h"
-
-
-#include "afs/sysincludes.h" /* Standard vendor system headers */
-#include "afsincludes.h" /* Afs-based standard headers */
-#include "afs/afs_stats.h" /* afs statistics */
-
-#if defined(HAVE_LINUX_FREEZER_H)
-#include <linux/freezer.h>
-#endif
-
-static char waitV, dummyV;
-
-void
-afs_osi_InitWaitHandle(struct afs_osi_WaitHandle *achandle)
-{
- AFS_STATCNT(osi_InitWaitHandle);
- achandle->proc = (caddr_t) 0;
-}
-
-/* cancel osi_Wait */
-void
-afs_osi_CancelWait(struct afs_osi_WaitHandle *achandle)
-{
- caddr_t proc;
-
- AFS_STATCNT(osi_CancelWait);
- proc = achandle->proc;
- if (proc == 0)
- return;
- achandle->proc = (caddr_t) 0; /* so dude can figure out he was signalled */
- afs_osi_Wakeup(&waitV);
-}
-
-/* afs_osi_Wait
- * Waits for data on ahandle, or ams ms later. ahandle may be null.
- * Returns 0 if timeout and EINTR if signalled.
- */
-int
-afs_osi_Wait(afs_int32 ams, struct afs_osi_WaitHandle *ahandle, int aintok)
-{
- afs_int32 endTime;
- int code;
-
- AFS_STATCNT(osi_Wait);
- endTime = osi_Time() + (ams / 1000);
- if (ahandle)
- ahandle->proc = (caddr_t) current;
-
- do {
- AFS_ASSERT_GLOCK();
- code = afs_osi_TimedSleep(&waitV, ams, 1);
- if (code)
- break;
- if (ahandle && (ahandle->proc == (caddr_t) 0)) {
- /* we've been signalled */
- break;
- }
- } while (osi_Time() < endTime);
- return code;
-}
-
-
-
-
-afs_event_t *afs_evhasht[AFS_EVHASHSIZE]; /* Hash table for events */
-#define afs_evhash(event) (afs_uint32) ((((long)event)>>2) & (AFS_EVHASHSIZE-1))
-int afs_evhashcnt = 0;
-
-/* Get and initialize event structure corresponding to lwp event (i.e. address)
- * */
-static afs_event_t *
-afs_getevent(char *event)
-{
- afs_event_t *evp, *newp = 0;
- int hashcode;
-
- AFS_ASSERT_GLOCK();
- hashcode = afs_evhash(event);
- evp = afs_evhasht[hashcode];
- while (evp) {
- if (evp->event == event) {
- evp->refcount++;
- return evp;
- }
- if (evp->refcount == 0)
- newp = evp;
- evp = evp->next;
- }
- if (!newp)
- return NULL;
-
- newp->event = event;
- newp->refcount = 1;
- return newp;
-}
-
-/* afs_addevent -- allocates a new event for the address. It isn't returned;
- * instead, afs_getevent should be called again. Thus, the real effect of
- * this routine is to add another event to the hash bucket for this
- * address.
- *
- * Locks:
- * Called with GLOCK held. However the function might drop
- * GLOCK when it calls osi_AllocSmallSpace for allocating
- * a new event (In Linux, the allocator drops GLOCK to avoid
- * a deadlock).
- */
-
-static void
-afs_addevent(char *event)
-{
- int hashcode;
- afs_event_t *newp;
-
- AFS_ASSERT_GLOCK();
- hashcode = afs_evhash(event);
- newp = osi_linux_alloc(sizeof(afs_event_t), 0);
- afs_evhashcnt++;
- newp->next = afs_evhasht[hashcode];
- afs_evhasht[hashcode] = newp;
-#if defined(AFS_LINUX24_ENV)
- init_waitqueue_head(&newp->cond);
-#else
- init_waitqueue(&newp->cond);
-#endif
- newp->seq = 0;
- newp->event = &dummyV; /* Dummy address for new events */
- newp->refcount = 0;
-}
-
-#ifndef set_current_state
-#define set_current_state(x) current->state = (x)
-#endif
-
-/* Release the specified event */
-#define relevent(evp) ((evp)->refcount--)
-
-/* afs_osi_SleepSig
- *
- * Waits for an event to be notified, returning early if a signal
- * is received. Returns EINTR if signaled, and 0 otherwise.
- */
-int
-afs_osi_SleepSig(void *event)
-{
- struct afs_event *evp;
- int seq, retval;
-#ifdef DECLARE_WAITQUEUE
- DECLARE_WAITQUEUE(wait, current);
-#else
- struct wait_queue wait = { current, NULL };
-#endif
-
- evp = afs_getevent(event);
- if (!evp) {
- afs_addevent(event);
- evp = afs_getevent(event);
- }
-
- seq = evp->seq;
- retval = 0;
-
- add_wait_queue(&evp->cond, &wait);
- while (seq == evp->seq) {
- set_current_state(TASK_INTERRUPTIBLE);
- AFS_ASSERT_GLOCK();
- AFS_GUNLOCK();
- schedule();
- AFS_GLOCK();
- if (signal_pending(current)) {
- retval = EINTR;
- break;
- }
- }
- remove_wait_queue(&evp->cond, &wait);
- set_current_state(TASK_RUNNING);
-
- relevent(evp);
- return retval;
-}
-
-/* afs_osi_Sleep -- waits for an event to be notified, ignoring signals.
- * - NOTE: that on Linux, there are circumstances in which TASK_INTERRUPTIBLE
- * can wake up, even if all signals are blocked
- * - TODO: handle signals correctly by passing an indication back to the
- * caller that the wait has been interrupted and the stack should be cleaned
- * up preparatory to signal delivery
- */
-void
-afs_osi_Sleep(void *event)
-{
- sigset_t saved_set;
-
- SIG_LOCK(current);
- saved_set = current->blocked;
- sigfillset(¤t->blocked);
- RECALC_SIGPENDING(current);
- SIG_UNLOCK(current);
-
- afs_osi_SleepSig(event);
-
- SIG_LOCK(current);
- current->blocked = saved_set;
- RECALC_SIGPENDING(current);
- SIG_UNLOCK(current);
-}
-
-/* afs_osi_TimedSleep
- *
- * Arguments:
- * event - event to sleep on
- * ams --- max sleep time in milliseconds
- * aintok - 1 if should sleep interruptibly
- *
- * Returns 0 if timeout, EINTR if signalled, and EGAIN if it might
- * have raced.
- */
-int
-afs_osi_TimedSleep(void *event, afs_int32 ams, int aintok)
-{
- int code = 0;
- long ticks = (ams * HZ / 1000) + 1;
- struct afs_event *evp;
-#ifdef DECLARE_WAITQUEUE
- DECLARE_WAITQUEUE(wait, current);
-#else
- struct wait_queue wait = { current, NULL };
-#endif
-
- evp = afs_getevent(event);
- if (!evp) {
- afs_addevent(event);
- evp = afs_getevent(event);
- }
-
- add_wait_queue(&evp->cond, &wait);
- set_current_state(TASK_INTERRUPTIBLE);
- /* always sleep TASK_INTERRUPTIBLE to keep load average
- * from artifically increasing. */
- AFS_GUNLOCK();
-
- if (aintok) {
- if (schedule_timeout(ticks))
- code = EINTR;
- } else
- schedule_timeout(ticks);
-
- AFS_GLOCK();
- remove_wait_queue(&evp->cond, &wait);
- set_current_state(TASK_RUNNING);
-
- relevent(evp);
-
- return code;
-}
-
-
-int
-afs_osi_Wakeup(void *event)
-{
- int ret = 2;
- struct afs_event *evp;
-
- evp = afs_getevent(event);
- if (!evp) /* No sleepers */
- return 1;
-
- if (evp->refcount > 1) {
- evp->seq++;
- wake_up(&evp->cond);
- ret = 0;
- }
- relevent(evp);
- return ret;
-}