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/*************************************************************************
* Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimension-impl.h"
#include <pthread.h>
#include <stdio.h> /* For fprintf() */
#include <stdlib.h> /* For exit() */
static void dmnsn_default_fatal_error_fn(void);
static dmnsn_fatal_error_fn *dmnsn_fatal = &dmnsn_default_fatal_error_fn;
static dmnsn_severity dmnsn_resilience = DMNSN_SEVERITY_MEDIUM;
static pthread_mutex_t dmnsn_resilience_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t dmnsn_fatal_mutex = PTHREAD_MUTEX_INITIALIZER;
/* Called by dmnsn_error macro (don't call directly). */
void
dmnsn_report_error(dmnsn_severity severity,
const char *func, const char *file, unsigned int line,
const char *str)
{
if (severity >= dmnsn_get_resilience()) {
/* An error more severe than our resilience happened, bail out */
fprintf(stderr, "Dimension ERROR: %s, %s:%u: %s\n",
func, file, line, str);
dmnsn_fatal_error_fn *fatal = dmnsn_get_fatal_error_fn();
(*fatal)();
exit(EXIT_FAILURE); /* Failsafe in case *dmnsn_fatal doesn't exit */
} else {
/* A trivial error happened, warn and continue */
fprintf(stderr, "Dimension WARNING: %s, %s:%u: %s\n",
func, file, line, str);
}
}
/* Return the current resilience, thread-safely. */
dmnsn_severity
dmnsn_get_resilience()
{
dmnsn_severity resilience;
if (pthread_mutex_lock(&dmnsn_resilience_mutex) != 0) {
/* Couldn't lock the mutex, so warn and continue. */
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't lock resilience mutex.");
}
resilience = dmnsn_resilience; /* Copy the static variable to a local */
if (pthread_mutex_unlock(&dmnsn_resilience_mutex) != 0) {
/* Couldn't unlock the mutex, so warn and continue. If the mutex was locked
earlier, the next dmnsn_get/set_resilience is likely to hang. */
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't unlock resilience mutex.");
}
return resilience;
}
/* Set the resilience, thread-safely */
void
dmnsn_set_resilience(dmnsn_severity resilience)
{
if (resilience > DMNSN_SEVERITY_HIGH) {
/* Tried to set an illegal resilience, bail out */
fprintf(stderr, "Dimension ERROR: %s, line %u: %s\n", DMNSN_FUNC, __LINE__,
"Resilience has wrong value.");
dmnsn_fatal_error_fn *fatal = dmnsn_get_fatal_error_fn();
(*fatal)();
exit(EXIT_FAILURE);
}
if (pthread_mutex_lock(&dmnsn_resilience_mutex) != 0) {
/* Couldn't lock the mutex, so warn and continue. */
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't lock resilience mutex.");
}
dmnsn_resilience = resilience;
if (pthread_mutex_unlock(&dmnsn_resilience_mutex) != 0) {
/* Couldn't unlock the mutex, so warn and continue. If the mutex was locked
earlier, the next dmnsn_get/set_resilience is likely to hang. */
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't unlock resilience mutex.");
}
}
dmnsn_fatal_error_fn *dmnsn_get_fatal_error_fn()
{
dmnsn_fatal_error_fn *fatal;
if (pthread_mutex_lock(&dmnsn_fatal_mutex) != 0) {
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't lock fatal error handler mutex.");
}
fatal = dmnsn_fatal;
if (pthread_mutex_unlock(&dmnsn_fatal_mutex) != 0) {
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't unlock fatal error handler mutex.");
}
return fatal;
}
void dmnsn_set_fatal_error_fn(dmnsn_fatal_error_fn *fatal)
{
if (pthread_mutex_lock(&dmnsn_fatal_mutex) != 0) {
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't lock fatal error handler mutex.");
}
dmnsn_fatal = fatal;
if (pthread_mutex_unlock(&dmnsn_fatal_mutex) != 0) {
fprintf(stderr, "Dimension WARNING: %s, line %u: %s\n",
DMNSN_FUNC, __LINE__,
"Couldn't unlock fatal error handler mutex.");
}
}
/* Prevent infinite recursion if the fatal error function itself calls
dmnsn_error() */
static __thread bool dmnsn_tl_exiting = false;
static void
dmnsn_default_fatal_error_fn()
{
dmnsn_backtrace(stderr);
if (dmnsn_tl_exiting) {
abort();
} else if (dmnsn_is_main_thread()) {
exit(EXIT_FAILURE);
} else {
dmnsn_tl_exiting = true;
int *ret = malloc(sizeof(int)); /* Don't use dmnsn_malloc */
if (ret)
*ret = 1;
pthread_exit(ret);
}
}
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