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/* Copyright (C) 1999 Aladdin Enterprises. All rights reserved.
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This software is provided AS-IS with no warranty, either express or
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implied.
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This software is distributed under license and may not be copied,
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modified or distributed except as expressly authorized under the terms
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of the license contained in the file LICENSE in this distribution.
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For more information about licensing, please refer to
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http://www.ghostscript.com/licensing/. For information on
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commercial licensing, go to http://www.artifex.com/licensing/ or
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contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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*/
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/* $Id: gsnotify.c,v 1.5 2002/06/16 05:48:55 lpd Exp $ */
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/* Notification machinery implementation */
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#include "gx.h"
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#include "gserrors.h"
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#include "gsstruct.h"
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#include "gsnotify.h"
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/* GC descriptors */
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private_st_gs_notify_registration();
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public_st_gs_notify_list();
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/* Initialize a notification list. */
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void
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gs_notify_init(gs_notify_list_t *nlist, gs_memory_t *mem)
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{
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nlist->first = 0;
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nlist->memory = mem;
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}
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/* Register a client. */
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int
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gs_notify_register(gs_notify_list_t *nlist, gs_notify_proc_t proc,
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void *proc_data)
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{
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gs_notify_registration_t *nreg =
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gs_alloc_struct(nlist->memory, gs_notify_registration_t,
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&st_gs_notify_registration, "gs_notify_register");
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if (nreg == 0)
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return_error(gs_error_VMerror);
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nreg->proc = proc;
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nreg->proc_data = proc_data;
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nreg->next = nlist->first;
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nlist->first = nreg;
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return 0;
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}
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/*
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* Unregister a client. Return 1 if the client was registered, 0 if not.
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* If proc_data is 0, unregister all registrations of that proc; otherwise,
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* unregister only the registration of that procedure with that proc_data.
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*/
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private void
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no_unreg_proc(void *pdata)
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{
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}
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int
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gs_notify_unregister_calling(gs_notify_list_t *nlist, gs_notify_proc_t proc,
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void *proc_data,
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void (*unreg_proc)(void *pdata))
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{
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gs_notify_registration_t **prev = &nlist->first;
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gs_notify_registration_t *cur;
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bool found = 0;
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while ((cur = *prev) != 0)
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if (cur->proc == proc &&
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(proc_data == 0 || cur->proc_data == proc_data)
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) {
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*prev = cur->next;
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unreg_proc(cur->proc_data);
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gs_free_object(nlist->memory, cur, "gs_notify_unregister");
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found = 1;
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} else
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prev = &cur->next;
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return found;
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}
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int
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gs_notify_unregister(gs_notify_list_t *nlist, gs_notify_proc_t proc,
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void *proc_data)
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{
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return gs_notify_unregister_calling(nlist, proc, proc_data, no_unreg_proc);
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}
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/*
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* Notify the clients on a list. If an error occurs, return the first
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* error code, but notify all clients regardless.
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*/
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int
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gs_notify_all(gs_notify_list_t *nlist, void *event_data)
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{
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gs_notify_registration_t *cur;
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gs_notify_registration_t *next;
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int ecode = 0;
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for (next = nlist->first; (cur = next) != 0;) {
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int code;
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next = cur->next;
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code = cur->proc(cur->proc_data, event_data);
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if (code < 0 && ecode == 0)
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ecode = code;
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}
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return ecode;
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}
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/* Release a notification list. */
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void
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gs_notify_release(gs_notify_list_t *nlist)
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{
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gs_memory_t *mem = nlist->memory;
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while (nlist->first) {
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gs_notify_registration_t *next = nlist->first->next;
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gs_free_object(mem, nlist->first, "gs_notify_release");
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nlist->first = next;
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}
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}
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