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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2024 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "log.h"
#include "async_internal.h"
struct AsyncHandleStruct {
Element *element;
int identifier;
AsyncThreadSpecificData *tsd;
};
int
asyncMakeHandle (
AsyncHandle *handle,
Element *(*newElement) (const void *parameters),
const void *parameters
) {
if (handle) {
if (!(*handle = malloc(sizeof(**handle)))) {
logMallocError();
return 0;
}
}
{
Element *element = newElement(parameters);
if (element) {
if (handle) {
memset(*handle, 0, sizeof(**handle));
(*handle)->element = element;
(*handle)->identifier = getElementIdentifier(element);
(*handle)->tsd = asyncGetThreadSpecificData();
}
return 1;
}
}
if (handle) free(*handle);
return 0;
}
int
asyncTestHandle (AsyncHandle handle) {
AsyncThreadSpecificData *tsd = asyncGetThreadSpecificData();
if (handle->tsd == tsd) return 1;
logMessage(LOG_WARNING, "invalid async handle");
return 0;
}
Element *
asyncGetHandleElement (AsyncHandle handle, const Queue *queue) {
if (asyncTestHandle(handle)) {
if (queue) {
Element *element = handle->element;
if (handle->identifier == getElementIdentifier(element)) {
if ((queue == ASYNC_ANY_QUEUE) || (queue == getElementQueue(element))) {
return element;
}
}
}
}
return NULL;
}
void
asyncDiscardHandle (AsyncHandle handle) {
free(handle);
}
void
asyncCancelRequest (AsyncHandle handle) {
Element *element = asyncGetHandleElement(handle, ASYNC_ANY_QUEUE);
asyncDiscardHandle(handle);
if (element) {
Queue *queue = getElementQueue(element);
const AsyncQueueMethods *methods = getQueueData(queue);
if (methods) {
if (methods->cancelRequest) {
methods->cancelRequest(element);
return;
}
}
deleteElement(element);
}
}
typedef struct {
Element *element;
} ElementHandleParameters;
static Element *
newElementHandle (const void *parameters) {
const ElementHandleParameters *ehp = parameters;
return ehp->element;
}
int
asyncMakeElementHandle (AsyncHandle *handle, Element *element) {
const ElementHandleParameters ehp = {
.element = element
};
return asyncMakeHandle(handle, newElementHandle, &ehp);
}
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