354 lines
8.7 KiB
C
Executable File
354 lines
8.7 KiB
C
Executable File
/*
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* Copyright 2008 - 2014 Chris Young <chris@unsatisfactorysoftware.co.uk>
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*
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* This file is part of NetSurf, http://www.netsurf-browser.org/
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*
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* NetSurf is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* NetSurf is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "amiga/os3support.h"
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#include <proto/dos.h>
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#include <proto/exec.h>
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#include <proto/timer.h>
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#include <stdio.h>
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#include <stdbool.h>
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#include <pbl.h>
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#include "utils/errors.h"
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#include "utils/log.h"
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#include "amiga/misc.h"
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#include "amiga/schedule.h"
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static struct TimeRequest *tioreq;
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struct Device *TimerBase;
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#ifdef __amigaos4__
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struct TimerIFace *ITimer;
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#endif
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static APTR pool_nscb = NULL;
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static APTR pool_timereq = NULL;
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struct nscallback
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{
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struct TimeVal tv;
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void *callback;
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void *p;
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struct TimeRequest *treq;
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};
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static PblHeap *schedule_list;
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/**
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* Remove timer event
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*
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* \param nscb callback
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*
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* The timer event for the callback is aborted
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*/
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static void ami_schedule_remove_timer_event(struct nscallback *nscb)
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{
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if(!nscb) return;
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if(nscb->treq)
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{
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if(CheckIO((struct IORequest *)nscb->treq)==NULL)
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AbortIO((struct IORequest *)nscb->treq);
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WaitIO((struct IORequest *)nscb->treq);
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ami_misc_itempool_free(pool_timereq, nscb->treq, sizeof(struct TimeRequest));
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}
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}
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/**
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* Add timer event
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*
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* \param nscb callback
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* \param t time in ms
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*
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* NetSurf will be signalled in t ms for this event.
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*/
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static nserror ami_schedule_add_timer_event(struct nscallback *nscb, int t)
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{
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struct TimeVal tv;
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ULONG time_us = t * 1000; /* t converted to µs */
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nscb->tv.Seconds = time_us / 1000000;
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nscb->tv.Microseconds = time_us % 1000000;
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GetSysTime(&tv);
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AddTime(&nscb->tv,&tv); // now contains time when event occurs
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if((nscb->treq = ami_misc_itempool_alloc(pool_timereq, sizeof(struct TimeRequest)))) {
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*nscb->treq = *tioreq;
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nscb->treq->Request.io_Command=TR_ADDREQUEST;
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nscb->treq->Time.Seconds=nscb->tv.Seconds; // secs
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nscb->treq->Time.Microseconds=nscb->tv.Microseconds; // micro
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SendIO((struct IORequest *)nscb->treq);
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} else {
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return NSERROR_NOMEM;
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}
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return NSERROR_OK;
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}
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/**
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* Locate a scheduled callback
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*
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* \param callback callback function
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* \param p user parameter, passed to callback function
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* \param remove remove callback from the heap
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*
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* A scheduled callback matching both callback and p is returned, or NULL if none present.
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*/
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static struct nscallback *ami_schedule_locate(void (*callback)(void *p), void *p, bool remove)
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{
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PblIterator *iterator;
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struct nscallback *nscb;
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bool found_cb = false;
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/* check there is something on the list */
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if (schedule_list == NULL) return NULL;
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if(pblHeapIsEmpty(schedule_list)) return NULL;
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iterator = pblHeapIterator(schedule_list);
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while ((nscb = pblIteratorNext(iterator)) != -1) {
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if ((nscb->callback == callback) && (nscb->p == p)) {
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if (remove == true) pblIteratorRemove(iterator);
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found_cb = true;
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break;
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}
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};
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pblIteratorFree(iterator);
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if (found_cb == true) return nscb;
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else return NULL;
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}
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/**
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* Reschedule a callback.
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*
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* \param nscb callback
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* \param t time in ms
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*
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* The nscallback will be rescheduled for t ms.
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*/
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static nserror ami_schedule_reschedule(struct nscallback *nscb, int t)
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{
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ami_schedule_remove_timer_event(nscb);
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if (ami_schedule_add_timer_event(nscb, t) != NSERROR_OK)
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return NSERROR_NOMEM;
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pblHeapConstruct(schedule_list);
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return NSERROR_OK;
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}
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/**
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* Unschedule a callback.
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*
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* \param callback callback function
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* \param p user parameter, passed to callback function
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*
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* All scheduled callbacks matching both callback and p are removed.
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*/
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static nserror schedule_remove(void (*callback)(void *p), void *p)
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{
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struct nscallback *nscb;
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nscb = ami_schedule_locate(callback, p, true);
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if(nscb != NULL) {
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ami_schedule_remove_timer_event(nscb);
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ami_misc_itempool_free(pool_nscb, nscb, sizeof(struct nscallback));
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pblHeapConstruct(schedule_list);
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}
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return NSERROR_OK;
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}
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static void schedule_remove_all(void)
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{
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PblIterator *iterator;
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struct nscallback *nscb;
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if(pblHeapIsEmpty(schedule_list)) return;
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iterator = pblHeapIterator(schedule_list);
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while ((nscb = pblIteratorNext(iterator)) != -1)
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{
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ami_schedule_remove_timer_event(nscb);
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pblIteratorRemove(iterator);
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ami_misc_itempool_free(pool_nscb, nscb, sizeof(struct nscallback));
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};
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pblIteratorFree(iterator);
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}
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static int ami_schedule_compare(const void *prev, const void *next)
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{
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struct nscallback *nscb1 = *(struct nscallback **)prev;
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struct nscallback *nscb2 = *(struct nscallback **)next;
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return CmpTime(&nscb1->tv, &nscb2->tv);
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}
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/**
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* Process events up to current time.
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*
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* This implementation only takes the top entry off the heap, it does not
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* venture to later scheduled events until the next time it is called -
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* immediately afterwards, if we're in a timer signalled loop.
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*/
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static void ami_scheduler_run(void)
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{
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struct nscallback *nscb;
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struct TimeVal tv;
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void (*callback)(void *p);
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void *p;
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nscb = pblHeapGetFirst(schedule_list);
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if(nscb == -1) return;
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/* Ensure the scheduled event time has passed (CmpTime<=0)
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* in case something been deleted between the timer
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* signalling us and us responding to it.
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*/
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GetSysTime(&tv);
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if(CmpTime(&tv, &nscb->tv) > 0) return;
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callback = nscb->callback;
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p = nscb->p;
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ami_schedule_remove_timer_event(nscb);
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pblHeapRemoveFirst(schedule_list);
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ami_misc_itempool_free(pool_nscb, nscb, sizeof(struct nscallback));
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LOG("Running scheduled callback %p with arg %p", callback, p);
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callback(p);
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return;
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}
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static void ami_schedule_open_timer(struct MsgPort *msgport)
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{
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#ifdef __amigaos4__
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tioreq = (struct TimeRequest *)AllocSysObjectTags(ASOT_IOREQUEST,
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ASOIOR_Size,sizeof(struct TimeRequest),
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ASOIOR_ReplyPort,msgport,
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ASO_NoTrack,FALSE,
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TAG_DONE);
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#else
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tioreq = (struct TimeRequest *)CreateIORequest(msgport, sizeof(struct TimeRequest));
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#endif
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OpenDevice("timer.device", UNIT_WAITUNTIL, (struct IORequest *)tioreq, 0);
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TimerBase = (struct Device *)tioreq->Request.io_Device;
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#ifdef __amigaos4__
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ITimer = (struct TimerIFace *)GetInterface((struct Library *)TimerBase, "main", 1, NULL);
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#endif
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}
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static void ami_schedule_close_timer(void)
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{
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#ifdef __amigaos4__
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if(ITimer) DropInterface((struct Interface *)ITimer);
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#endif
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CloseDevice((struct IORequest *) tioreq);
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FreeSysObject(ASOT_IOREQUEST, tioreq);
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}
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/* exported interface documented in amiga/schedule.h */
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nserror ami_schedule_create(struct MsgPort *msgport)
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{
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pool_nscb = ami_misc_itempool_create(sizeof(struct nscallback));
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pool_timereq = ami_misc_itempool_create(sizeof(struct TimeRequest));
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ami_schedule_open_timer(msgport);
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schedule_list = pblHeapNew();
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if(schedule_list == PBL_ERROR_OUT_OF_MEMORY) return NSERROR_NOMEM;
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pblHeapSetCompareFunction(schedule_list, ami_schedule_compare);
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return NSERROR_OK;
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}
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/* exported interface documented in amiga/schedule.h */
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void ami_schedule_free(void)
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{
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schedule_remove_all();
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pblHeapFree(schedule_list); // this should be empty at this point
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schedule_list = NULL;
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ami_schedule_close_timer();
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ami_misc_itempool_delete(pool_timereq);
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ami_misc_itempool_delete(pool_nscb);
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}
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/* exported function documented in amiga/schedule.h */
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nserror ami_schedule(int t, void (*callback)(void *p), void *p)
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{
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struct nscallback *nscb;
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if(schedule_list == NULL) return NSERROR_INIT_FAILED;
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if(t < 0) return schedule_remove(callback, p);
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if ((nscb = ami_schedule_locate(callback, p, false))) {
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return ami_schedule_reschedule(nscb, t);
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}
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nscb = ami_misc_itempool_alloc(pool_nscb, sizeof(struct nscallback));
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if(!nscb) return NSERROR_NOMEM;
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if (ami_schedule_add_timer_event(nscb, t) != NSERROR_OK)
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return NSERROR_NOMEM;
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nscb->callback = callback;
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nscb->p = p;
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pblHeapInsert(schedule_list, nscb);
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return NSERROR_OK;
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}
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/* exported interface documented in amiga/schedule.h */
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void ami_schedule_handle(struct MsgPort *nsmsgport)
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{
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/* nsmsgport is the NetSurf message port that the scheduler task
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* (or timer.device in no-async mode) is sending messages to. */
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struct TimerRequest *timermsg;
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while((timermsg = (struct TimerRequest *)GetMsg(nsmsgport))) {
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/* reply first, as we don't need the message contents and
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* it crashes if we reply after schedule_run has executed.
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*/
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ReplyMsg((struct Message *)timermsg);
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ami_scheduler_run();
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}
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}
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