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/*
* ion/libmainloop/defer.c
*
* Copyright (c) Tuomo Valkonen 1999-2007.
*
* See the included file LICENSE for details.
*/
/* This file contains routines for deferred execution of potentially
* dangerous actions. They're called upon returning to the main
* loop.
*/
#include <libtu/obj.h>
#include <libtu/objp.h>
#include <libtu/types.h>
#include <libtu/misc.h>
#include <libtu/dlist.h>
#include <libtu/output.h>
#include <libtu/locale.h>
#include "defer.h"
DECLSTRUCT(WDeferred){
Watch watch;
WDeferredAction *action;
ExtlFn fn;
WDeferred *next, *prev;
WDeferred **list;
};
static WDeferred *deferred=NULL;
#define N_DBUF 16
/* To avoid allocating memory all the time, we use a small
* buffer that should be able to contain the small expected
* number of simultaneous deferred actions.
*/
static WDeferred dbuf[N_DBUF];
static int dbuf_used=0;
static WDeferred *alloc_defer()
{
int i;
/* Keeping it simple -- this naive loop should do it
* as N_DBUF is small.
*/
for(i=0; i<N_DBUF; i++){
if(!(dbuf_used&(1<<i))){
dbuf_used|=(1<<i);
return dbuf+i;
}
}
return ALLOC(WDeferred);
}
static void free_defer(WDeferred *d)
{
if(d>=dbuf && d<dbuf+N_DBUF){
dbuf_used&=~(1<<(d-dbuf));
return;
}
FREE(d);
}
static void defer_watch_handler(Watch *w, Obj *UNUSED(obj))
{
WDeferred *d=(WDeferred*)w;
UNLINK_ITEM(*(WDeferred**)(d->list), d, next, prev);
free_defer(d);
warn(TR("Object destroyed while deferred actions are still pending."));
}
static bool already_deferred(Obj *obj, WDeferredAction *action,
WDeferred *list)
{
WDeferred *d;
for(d=list; d!=NULL; d=d->next){
if(d->action==action && d->watch.obj==obj)
return TRUE;
}
return FALSE;
}
bool mainloop_defer_action_on_list(Obj *obj, WDeferredAction *action,
WDeferred **list)
{
WDeferred *d;
if(already_deferred(obj, action, *list))
return TRUE;
d=alloc_defer();
if(d==NULL){
warn_err();
return FALSE;
}
d->action=action;
d->list=list;
d->fn=extl_fn_none();
if(obj!=NULL)
watch_setup(&(d->watch), obj, defer_watch_handler);
LINK_ITEM(*list, d, next, prev);
return TRUE;
}
bool mainloop_defer_action(Obj *obj, WDeferredAction *action)
{
return mainloop_defer_action_on_list(obj, action, &deferred);
}
bool mainloop_defer_destroy(Obj *obj)
{
if(OBJ_IS_BEING_DESTROYED(obj))
return FALSE;
return mainloop_defer_action(obj, destroy_obj);
}
bool mainloop_defer_extl_on_list(ExtlFn fn, WDeferred **list)
{
WDeferred *d;
d=alloc_defer();
if(d==NULL){
warn_err();
return FALSE;
}
d->action=NULL;
d->list=list;
d->fn=extl_ref_fn(fn);
watch_init(&(d->watch));
LINK_ITEM(*list, d, next, prev);
return TRUE;
}
/*EXTL_DOC
* Defer execution of \var{fn} until the main loop.
*/
EXTL_SAFE
EXTL_EXPORT_AS(mainloop, defer)
bool mainloop_defer_extl(ExtlFn fn)
{
return mainloop_defer_extl_on_list(fn, &deferred);
}
static void do_execute(WDeferred *d)
{
Obj *obj=d->watch.obj;
WDeferredAction *a=d->action;
ExtlFn fn=d->fn;
watch_reset(&(d->watch));
free_defer(d);
if(a!=NULL){
if(obj!=NULL)
a(obj);
}else if(fn!=extl_fn_none()){
extl_call(fn, NULL, NULL);
extl_unref_fn(fn);
}
}
void mainloop_execute_deferred_on_list(WDeferred **list)
{
while(*list!=NULL){
WDeferred *d=*list;
UNLINK_ITEM(*list, d, next, prev);
do_execute(d);
}
}
void mainloop_execute_deferred()
{
mainloop_execute_deferred_on_list(&deferred);
}
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