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/* Copyright (c) 2014, 2017, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program 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 General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/thr_cond.cc
*/
#ifdef SAFE_MUTEX
#include "thr_cond.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "my_thread_local.h"
int safe_cond_wait(native_cond_t *cond, safe_mutex_t *mp, const char *file,
uint line) {
int error;
native_mutex_lock(&mp->global);
if (mp->count == 0) {
fprintf(
stderr,
"safe_mutex: Trying to cond_wait on a unlocked mutex at %s, line %d\n",
file, line);
fflush(stderr);
abort();
}
if (!my_thread_equal(my_thread_self(), mp->thread)) {
fprintf(stderr,
"safe_mutex: Trying to cond_wait on a mutex at %s, line %d that "
"was locked by another thread at: %s, line: %d\n",
file, line, mp->file, mp->line);
fflush(stderr);
abort();
}
if (mp->count-- != 1) {
fprintf(stderr,
"safe_mutex: Count was %d on locked mutex at %s, line %d\n",
mp->count + 1, file, line);
fflush(stderr);
abort();
}
native_mutex_unlock(&mp->global);
error = native_cond_wait(cond, &mp->mutex);
native_mutex_lock(&mp->global);
if (error) {
fprintf(stderr,
"safe_mutex: Got error: %d (%d) when doing a safe_mutex_wait at "
"%s, line %d\n",
error, errno, file, line);
fflush(stderr);
abort();
}
mp->thread = my_thread_self();
if (mp->count++) {
#ifndef DBUG_OFF
fprintf(stderr,
"safe_mutex: Count was %d in thread 0x%x when locking mutex at "
"%s, line %d\n",
mp->count - 1, my_thread_var_id(), file, line);
fflush(stderr);
#endif
abort();
}
mp->file = file;
mp->line = line;
native_mutex_unlock(&mp->global);
return error;
}
int safe_cond_timedwait(native_cond_t *cond, safe_mutex_t *mp,
const struct timespec *abstime, const char *file,
uint line) {
int error;
native_mutex_lock(&mp->global);
if (mp->count != 1 || !my_thread_equal(my_thread_self(), mp->thread)) {
fprintf(
stderr,
"safe_mutex: Trying to cond_wait at %s, line %d on a not hold mutex\n",
file, line);
fflush(stderr);
abort();
}
mp->count--; /* Mutex will be released */
native_mutex_unlock(&mp->global);
error = native_cond_timedwait(cond, &mp->mutex, abstime);
#ifdef EXTRA_DEBUG
if (error != 0 && error != EINTR && !is_timeout(error)) {
fprintf(stderr,
"safe_mutex: Got error: %d (%d) when doing a safe_cond_timedwait "
"at %s, line %d\n",
error, errno, file, line);
}
#endif
native_mutex_lock(&mp->global);
mp->thread = my_thread_self();
if (mp->count++) {
#ifndef DBUG_OFF
fprintf(stderr,
"safe_mutex: Count was %d in thread 0x%x when locking mutex at "
"%s, line %d (error: %d (%d))\n",
mp->count - 1, my_thread_var_id(), file, line, error, error);
fflush(stderr);
#endif
abort();
}
mp->file = file;
mp->line = line;
native_mutex_unlock(&mp->global);
return error;
}
#endif
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