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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) 1995-2014 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "log.h"
#include "thread.h"
#include "async_internal.h"
static AsyncThreadSpecificData *
newThreadSpecificData (void) {
AsyncThreadSpecificData *tsd;
if ((tsd = malloc(sizeof(*tsd)))) {
memset(tsd, 0, sizeof(*tsd));
tsd->waitData = NULL;
tsd->alarmData = NULL;
tsd->taskData = NULL;
tsd->ioData = NULL;
tsd->signalData = NULL;
return tsd;
} else {
logMallocError();
}
return NULL;
}
static void
destroyThreadSpecificData (AsyncThreadSpecificData *tsd) {
if (tsd) {
asyncDeallocateWaitData(tsd->waitData);
asyncDeallocateAlarmData(tsd->alarmData);
asyncDeallocateTaskData(tsd->taskData);
asyncDeallocateIoData(tsd->ioData);
#ifdef ASYNC_CAN_HANDLE_SIGNALS
asyncDeallocateSignalData(tsd->signalData);
#endif /* ASYNC_CAN_HANDLE_SIGNALS */
free(tsd);
}
}
#ifdef PTHREAD_ONCE_INIT
static pthread_once_t tsdOnce = PTHREAD_ONCE_INIT;
static pthread_key_t tsdKey;
static unsigned char tsdKeyCreated = 0;
static void
tsdDestroyData (void *data) {
AsyncThreadSpecificData *tsd = data;
destroyThreadSpecificData(tsd);
}
static void
tsdCreateKey (void) {
int error = pthread_key_create(&tsdKey, tsdDestroyData);
if (!error) {
tsdKeyCreated = 1;
} else {
logActionError(error, "pthread_key_create");
}
}
AsyncThreadSpecificData *
asyncGetThreadSpecificData (void) {
int error;
if (!(error = pthread_once(&tsdOnce, tsdCreateKey))) {
if (tsdKeyCreated) {
AsyncThreadSpecificData *tsd = pthread_getspecific(tsdKey);
if (tsd) return tsd;
if ((tsd = newThreadSpecificData())) {
if (!(error = pthread_setspecific(tsdKey, tsd))) {
return tsd;
} else {
logActionError(error, "pthread_setspecific");
}
destroyThreadSpecificData(tsd);
}
}
} else {
logActionError(error, "pthread_once");
}
return NULL;
}
#else /* PTHREAD_ONCE_INIT */
#include "program.h"
static AsyncThreadSpecificData *threadSpecificData = NULL;
static void
exitThreadSpecificData (void *data) {
if (threadSpecificData) {
destroyThreadSpecificData(threadSpecificData);
threadSpecificData = NULL;
}
}
AsyncThreadSpecificData *
asyncGetThreadSpecificData (void) {
if (!threadSpecificData) {
if ((threadSpecificData = newThreadSpecificData())) {
onProgramExit("async-data", exitThreadSpecificData, NULL);
}
}
return threadSpecificData;
}
#endif /* PTHREAD_ONCE_INIT */
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