netsurf/frontends/amiga/schedule.c

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/*
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* Copyright 2008 - 2014 Chris Young <chris@unsatisfactorysoftware.co.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "amiga/os3support.h"
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#include <proto/dos.h>
#include <proto/exec.h>
#include <proto/timer.h>
#include <stdio.h>
#include <stdbool.h>
#include <pbl.h>
#include "utils/errors.h"
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#include "utils/log.h"
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#include "amiga/misc.h"
#include "amiga/schedule.h"
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static struct TimeRequest *tioreq;
struct Device *TimerBase;
#ifdef __amigaos4__
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struct TimerIFace *ITimer;
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#endif
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static APTR restrict pool_nscb = NULL;
static APTR restrict pool_timereq = NULL;
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struct nscallback
{
struct TimeVal tv;
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void *restrict callback;
void *restrict p;
struct TimeRequest *treq;
};
static PblHeap *schedule_list;
/**
* Remove timer event
*
* \param nscb callback
*
* The timer event for the callback is aborted
*/
static void ami_schedule_remove_timer_event(struct nscallback *nscb)
{
if(!nscb) return;
if(nscb->treq)
{
if(CheckIO((struct IORequest *)nscb->treq)==NULL)
AbortIO((struct IORequest *)nscb->treq);
WaitIO((struct IORequest *)nscb->treq);
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ami_misc_itempool_free(pool_timereq, nscb->treq, sizeof(struct TimeRequest));
}
}
/**
* Add timer event
*
* \param nscb callback
* \param t time in ms
*
* NetSurf will be signalled in t ms for this event.
*/
static nserror ami_schedule_add_timer_event(struct nscallback *nscb, int t)
{
struct TimeVal tv;
ULONG time_us = t * 1000; /* t converted to <20>s */
nscb->tv.Seconds = time_us / 1000000;
nscb->tv.Microseconds = time_us % 1000000;
if(nscb->tv.Microseconds >= 1000000) {
LOG("Microseconds invalid value: %ld", nscb->tv.Microseconds);
}
GetSysTime(&tv);
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)))) {
*nscb->treq = *tioreq;
nscb->treq->Request.io_Command=TR_ADDREQUEST;
nscb->treq->Time.Seconds=nscb->tv.Seconds; // secs
nscb->treq->Time.Microseconds=nscb->tv.Microseconds; // micro
SendIO((struct IORequest *)nscb->treq);
} else {
return NSERROR_NOMEM;
}
return NSERROR_OK;
}
/**
* Locate a scheduled callback
*
* \param callback callback function
* \param p user parameter, passed to callback function
* \param remove remove callback from the heap
*
* A scheduled callback matching both callback and p is returned, or NULL if none present.
*/
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static struct nscallback *ami_schedule_locate(void (*callback)(void *p), void *p, bool remove)
{
PblIterator *iterator;
struct nscallback *nscb;
bool found_cb = false;
/* 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;
iterator = pblHeapIterator(schedule_list);
while ((nscb = pblIteratorNext(iterator)) != -1) {
if ((nscb->callback == callback) && (nscb->p == p)) {
if (remove == true) pblIteratorRemove(iterator);
found_cb = true;
break;
}
};
pblIteratorFree(iterator);
if (found_cb == true) return nscb;
else return NULL;
}
/**
* Reschedule a callback.
*
* \param nscb callback
* \param t time in ms
*
* The nscallback will be rescheduled for t ms.
*/
static nserror ami_schedule_reschedule(struct nscallback *nscb, int t)
{
ami_schedule_remove_timer_event(nscb);
if (ami_schedule_add_timer_event(nscb, t) != NSERROR_OK)
return NSERROR_NOMEM;
pblHeapConstruct(schedule_list);
return NSERROR_OK;
}
/**
* Unschedule a callback.
*
* \param callback callback function
* \param p user parameter, passed to callback function
*
* All scheduled callbacks matching both callback and p are removed.
*/
static nserror schedule_remove(void (*callback)(void *p), void *p)
{
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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LOG("Event scheduled for following time was deleted: %ld.%ld", nscb->tv.Seconds, nscb->tv.Microseconds);
ami_schedule_remove_timer_event(nscb);
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ami_misc_itempool_free(pool_nscb, nscb, sizeof(struct nscallback));
pblHeapConstruct(schedule_list);
}
return NSERROR_OK;
}
static void schedule_remove_all(void)
{
PblIterator *iterator;
struct nscallback *nscb;
if(pblHeapIsEmpty(schedule_list)) return;
iterator = pblHeapIterator(schedule_list);
while ((nscb = pblIteratorNext(iterator)) != -1)
{
ami_schedule_remove_timer_event(nscb);
pblIteratorRemove(iterator);
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ami_misc_itempool_free(pool_nscb, nscb, sizeof(struct nscallback));
};
pblIteratorFree(iterator);
}
static int ami_schedule_compare(const void *prev, const void *next)
{
struct nscallback *nscb1 = *(struct nscallback **)prev;
struct nscallback *nscb2 = *(struct nscallback **)next;
return CmpTime(&nscb1->tv, &nscb2->tv);
}
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/**
* Process events up to current time.
*
* This implementation only takes the top entry off the heap, it does not
* venture to later scheduled events until the next time it is called -
* immediately afterwards, if we're in a timer signalled loop.
*/
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static bool ami_scheduler_run(void)
{
struct nscallback *nscb;
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struct TimeVal tv;
void (*callback)(void *p);
void *p;
nscb = pblHeapGetFirst(schedule_list);
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if(nscb == -1) {
LOG("Scheduler has no tasks to run!");
return false;
}
/* Ensure the scheduled event time has passed (CmpTime<=0)
* in case something been deleted between the timer
* signalling us and us responding to it.
*/
GetSysTime(&tv);
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if(CmpTime(&tv, &nscb->tv) > 0) {
LOG("Scheduled time of next event has not passed: %ld.%ld < %ld.%ld", tv.Seconds, tv.Microseconds, nscb->tv.Seconds, nscb->tv.Microseconds);
return false;
}
callback = nscb->callback;
p = nscb->p;
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ami_schedule_remove_timer_event(nscb);
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 true;
}
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static void ami_schedule_open_timer(struct MsgPort *msgport)
{
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#ifdef __amigaos4__
tioreq = (struct TimeRequest *)AllocSysObjectTags(ASOT_IOREQUEST,
ASOIOR_Size,sizeof(struct TimeRequest),
ASOIOR_ReplyPort,msgport,
ASO_NoTrack,FALSE,
TAG_DONE);
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#else
tioreq = (struct TimeRequest *)CreateIORequest(msgport, sizeof(struct TimeRequest));
#endif
OpenDevice("timer.device", UNIT_WAITUNTIL, (struct IORequest *)tioreq, 0);
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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static void ami_schedule_close_timer(void)
{
#ifdef __amigaos4__
if(ITimer) DropInterface((struct Interface *)ITimer);
#endif
CloseDevice((struct IORequest *) tioreq);
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FreeSysObject(ASOT_IOREQUEST, tioreq);
}
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/* exported interface documented in amiga/schedule.h */
nserror ami_schedule_create(struct MsgPort *msgport)
{
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pool_nscb = ami_misc_itempool_create(sizeof(struct nscallback));
pool_timereq = ami_misc_itempool_create(sizeof(struct TimeRequest));
ami_schedule_open_timer(msgport);
schedule_list = pblHeapNew();
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if(schedule_list == PBL_ERROR_OUT_OF_MEMORY) return NSERROR_NOMEM;
pblHeapSetCompareFunction(schedule_list, ami_schedule_compare);
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return NSERROR_OK;
}
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/* exported interface documented in amiga/schedule.h */
void ami_schedule_free(void)
{
schedule_remove_all();
pblHeapFree(schedule_list); // this should be empty at this point
schedule_list = NULL;
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ami_schedule_close_timer();
ami_misc_itempool_delete(pool_timereq);
ami_misc_itempool_delete(pool_nscb);
}
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/* exported function documented in amiga/schedule.h */
nserror ami_schedule(int t, void (*callback)(void *p), void *p)
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{
struct nscallback *nscb;
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))) {
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;
nscb->p = p;
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pblHeapInsert(schedule_list, nscb);
return NSERROR_OK;
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}
/* exported interface documented in amiga/schedule.h */
void ami_schedule_handle(struct MsgPort *nsmsgport)
{
/* nsmsgport is the NetSurf message port that the scheduler task
* (or timer.device in no-async mode) is sending messages to. */
struct TimerRequest *timermsg;
while((timermsg = (struct TimerRequest *)GetMsg(nsmsgport))) {
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ami_scheduler_run();
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}
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}