/* * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") * Copyright (c) 1996-1999 by Internet Software Consortium * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *//* ev_waits.c - implement deferred function calls for the eventlib * vix 05dec95 [initial] */#if !defined(LINT) && !defined(CODECENTER)static const char rcsid[] = "$Id: ev_waits.c,v 1.1.2.1.4.1 2004/03/09 08:33:43 marka Exp $";#endif#include "port_before.h"#include "fd_setsize.h"#include <errno.h>#include <isc/eventlib.h>#include <isc/assertions.h>#include "eventlib_p.h"#include "port_after.h"/* Forward. */static void		print_waits(evContext_p *ctx);static evWaitList *	evNewWaitList(evContext_p *);static void		evFreeWaitList(evContext_p *, evWaitList *);static evWaitList *	evGetWaitList(evContext_p *, const void *, int);/* Public. *//* * Enter a new wait function on the queue. */intevWaitFor(evContext opaqueCtx, const void *tag,	  evWaitFunc func, void *uap, evWaitID *id){	evContext_p *ctx = opaqueCtx.opaque;	evWait *new;	evWaitList *wl = evGetWaitList(ctx, tag, 1);	OKNEW(new);	new->func = func;	new->uap = uap;	new->tag = tag;	new->next = NULL;	if (wl->last != NULL)		wl->last->next = new;	else		wl->first = new;	wl->last = new;	if (id != NULL)		id->opaque = new;	if (ctx->debug >= 9)		print_waits(ctx);	return (0);}/* * Mark runnable all waiting functions having a certain tag. */intevDo(evContext opaqueCtx, const void *tag) {	evContext_p *ctx = opaqueCtx.opaque;	evWaitList *wl = evGetWaitList(ctx, tag, 0);	evWait *first;	if (!wl) {		errno = ENOENT;		return (-1);	}	first = wl->first;	INSIST(first != NULL);	if (ctx->waitDone.last != NULL)		ctx->waitDone.last->next = first;	else		ctx->waitDone.first = first;	ctx->waitDone.last = wl->last;	evFreeWaitList(ctx, wl);	return (0);}/* * Remove a waiting (or ready to run) function from the queue. */intevUnwait(evContext opaqueCtx, evWaitID id) {	evContext_p *ctx = opaqueCtx.opaque;	evWait *this, *prev;	evWaitList *wl;	int found = 0;	this = id.opaque;	INSIST(this != NULL);	wl = evGetWaitList(ctx, this->tag, 0);	if (wl != NULL) {		for (prev = NULL, this = wl->first;		     this != NULL;		     prev = this, this = this->next)			if (this == (evWait *)id.opaque) {				found = 1;				if (prev != NULL)					prev->next = this->next;				else					wl->first = this->next;				if (wl->last == this)					wl->last = prev;				if (wl->first == NULL)					evFreeWaitList(ctx, wl);				break;			}	}	if (!found) {		/* Maybe it's done */		for (prev = NULL, this = ctx->waitDone.first;		     this != NULL;		     prev = this, this = this->next)			if (this == (evWait *)id.opaque) {				found = 1;				if (prev != NULL)					prev->next = this->next;				else					ctx->waitDone.first = this->next;				if (ctx->waitDone.last == this)					ctx->waitDone.last = prev;				break;			}	}	if (!found) {		errno = ENOENT;		return (-1);	}	FREE(this);	if (ctx->debug >= 9)		print_waits(ctx);	return (0);}intevDefer(evContext opaqueCtx, evWaitFunc func, void *uap) {	evContext_p *ctx = opaqueCtx.opaque;	evWait *new;	OKNEW(new);	new->func = func;	new->uap = uap;	new->tag = NULL;	new->next = NULL;	if (ctx->waitDone.last != NULL)		ctx->waitDone.last->next = new;	else		ctx->waitDone.first = new;	ctx->waitDone.last = new;	if (ctx->debug >= 9)		print_waits(ctx);	return (0);}/* Private. */static voidprint_waits(evContext_p *ctx) {	evWaitList *wl;	evWait *this;	evPrintf(ctx, 9, "wait waiting:\n");	for (wl = ctx->waitLists; wl != NULL; wl = wl->next) {		INSIST(wl->first != NULL);		evPrintf(ctx, 9, "  tag %p:", wl->first->tag);		for (this = wl->first; this != NULL; this = this->next)			evPrintf(ctx, 9, " %p", this);		evPrintf(ctx, 9, "\n");	}	evPrintf(ctx, 9, "wait done:");	for (this = ctx->waitDone.first; this != NULL; this = this->next)		evPrintf(ctx, 9, " %p", this);	evPrintf(ctx, 9, "\n");}static evWaitList *evNewWaitList(evContext_p *ctx) {	evWaitList *new;	NEW(new);	if (new == NULL)		return (NULL);	new->first = new->last = NULL;	new->prev = NULL;	new->next = ctx->waitLists;	if (new->next != NULL)		new->next->prev = new;	ctx->waitLists = new;	return (new);}static voidevFreeWaitList(evContext_p *ctx, evWaitList *this) {	INSIST(this != NULL);	if (this->prev != NULL)		this->prev->next = this->next;	else		ctx->waitLists = this->next;	if (this->next != NULL)		this->next->prev = this->prev;	FREE(this);}static evWaitList *evGetWaitList(evContext_p *ctx, const void *tag, int should_create) {	evWaitList *this;	for (this = ctx->waitLists; this != NULL; this = this->next) {		if (this->first != NULL && this->first->tag == tag)			break;	}	if (this == NULL && should_create)		this = evNewWaitList(ctx);	return (this);}