/* * Copyright 2008 - 2014 Chris Young * * 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 . */ #include "amiga/os3support.h" #include #include #include #include #include #include #include "utils/errors.h" #include "utils/log.h" #include "amiga/misc.h" #include "amiga/schedule.h" static struct TimeRequest *tioreq; struct Device *TimerBase; #ifdef __amigaos4__ struct TimerIFace *ITimer; #endif static APTR restrict pool_nscb = NULL; static APTR restrict pool_timereq = NULL; struct nscallback { struct TimeVal tv; 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); 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 µs */ nscb->tv.Seconds = time_us / 1000000; nscb->tv.Microseconds = time_us % 1000000; GetSysTime(&tv); AddTime(&nscb->tv,&tv); // now contains time when event occurs 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. */ 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 */ if (schedule_list == NULL) return NULL; 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; nscb = ami_schedule_locate(callback, p, true); if(nscb != NULL) { ami_schedule_remove_timer_event(nscb); 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); 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); } /** * 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. */ static void ami_scheduler_run(void) { struct nscallback *nscb; struct TimeVal tv; void (*callback)(void *p); void *p; nscb = pblHeapGetFirst(schedule_list); if(nscb == -1) return; /* 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); if(CmpTime(&tv, &nscb->tv) > 0) return; callback = nscb->callback; p = nscb->p; ami_schedule_remove_timer_event(nscb); pblHeapRemoveFirst(schedule_list); ami_misc_itempool_free(pool_nscb, nscb, sizeof(struct nscallback)); LOG("Running scheduled callback %p with arg %p", callback, p); callback(p); return; } static void ami_schedule_open_timer(struct MsgPort *msgport) { #ifdef __amigaos4__ tioreq = (struct TimeRequest *)AllocSysObjectTags(ASOT_IOREQUEST, ASOIOR_Size,sizeof(struct TimeRequest), ASOIOR_ReplyPort,msgport, ASO_NoTrack,FALSE, TAG_DONE); #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; #ifdef __amigaos4__ ITimer = (struct TimerIFace *)GetInterface((struct Library *)TimerBase, "main", 1, NULL); #endif } static void ami_schedule_close_timer(void) { #ifdef __amigaos4__ if(ITimer) DropInterface((struct Interface *)ITimer); #endif CloseDevice((struct IORequest *) tioreq); FreeSysObject(ASOT_IOREQUEST, tioreq); } /* exported interface documented in amiga/schedule.h */ nserror ami_schedule_create(struct MsgPort *msgport) { 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(); if(schedule_list == PBL_ERROR_OUT_OF_MEMORY) return NSERROR_NOMEM; pblHeapSetCompareFunction(schedule_list, ami_schedule_compare); return NSERROR_OK; } /* 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; ami_schedule_close_timer(); ami_misc_itempool_delete(pool_timereq); ami_misc_itempool_delete(pool_nscb); } /* exported function documented in amiga/schedule.h */ nserror ami_schedule(int t, void (*callback)(void *p), void *p) { struct nscallback *nscb; if(schedule_list == NULL) return NSERROR_INIT_FAILED; if(t < 0) return schedule_remove(callback, p); if ((nscb = ami_schedule_locate(callback, p, false))) { return ami_schedule_reschedule(nscb, t); } nscb = ami_misc_itempool_alloc(pool_nscb, sizeof(struct nscallback)); if(!nscb) return NSERROR_NOMEM; if (ami_schedule_add_timer_event(nscb, t) != NSERROR_OK) return NSERROR_NOMEM; nscb->callback = callback; nscb->p = p; pblHeapInsert(schedule_list, nscb); return NSERROR_OK; } /* 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))) { /* reply first, as we don't need the message contents and * it crashes if we reply after schedule_run has executed. */ ReplyMsg((struct Message *)timermsg); ami_scheduler_run(); } }