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/*
* Copyright © 2012 Intel Corporation
*
* This 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 2.1 of the License, or (at your option) any later version.
*
* This 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 library. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdlib.h>
#include <assert.h>
#include <malloc.h>
#include <pthread.h>
#include <string.h>
#include "cl_mutex.h"
#include "cl_internals.h"
static pthread_mutex_t cl_mutex_log_lock;
static unsigned int cl_mutex_log_num;
typedef struct _cl_mutex_log_item {
pthread_mutex_t* mutex;
struct {
char* file;
int line;
} holder;
struct {
char* file;
int line;
} waiter[8];
} _cl_mutex_log_item;
typedef struct _cl_mutex_log_item* cl_mutex_log_item;
static cl_mutex_log_item* cl_mutex_log_map;
static int cl_mutex_log_map_size;
static int before_get_the_mutex(pthread_mutex_t* mutex, char* file, int line)
{
int i;
int ret = -1;
cl_mutex_log_item item = NULL;
pthread_mutex_lock(&cl_mutex_log_lock);
for (i = 0; i < cl_mutex_log_map_size; i++) {
if (cl_mutex_log_map[i]->mutex == mutex) {
item = cl_mutex_log_map[i];
break;
}
}
if (item == NULL) {
for (i = 0; i < cl_mutex_log_map_size; i++) {
if (cl_mutex_log_map[i] == NULL) {
break;
}
}
if (i == cl_mutex_log_map_size) {
cl_mutex_log_map = realloc(cl_mutex_log_map, 2*cl_mutex_log_map_size*sizeof(cl_mutex_log_item));
memset(cl_mutex_log_map + cl_mutex_log_map_size, 0, cl_mutex_log_map_size*sizeof(cl_mutex_log_item));
cl_mutex_log_map_size = cl_mutex_log_map_size*2;
}
item = malloc(sizeof(_cl_mutex_log_item));
assert(item);
memset(item, 0, sizeof(_cl_mutex_log_item));
item->waiter[0].file = file;
item->waiter[0].line = line;
cl_mutex_log_map[i] = item;
ret = 0;
cl_mutex_log_num++;
} else {
for (i = 0; i < 8; i++) {
if (item->waiter[i].file == NULL) {
item->waiter[i].file = file;
item->waiter[i].line = line;
ret = i;
break;
}
}
/* If no waiter slot avaible, just skip, do not record. */
}
pthread_mutex_unlock(&cl_mutex_log_lock);
return ret;
}
static void after_get_the_mutex(pthread_mutex_t* mutex, char* file, int line, int nth)
{
int i;
cl_mutex_log_item item = NULL;
pthread_mutex_lock(&cl_mutex_log_lock);
for (i = 0; i < cl_mutex_log_map_size; i++) {
if (cl_mutex_log_map[i]->mutex == mutex) {
item = cl_mutex_log_map[i];
break;
}
}
assert(item);
if (nth >= 0) {
assert(nth < 8);
item->waiter[nth].file = NULL;
item->waiter[nth].line = 0;
}
item->holder.file = file;
item->holder.line = line;
pthread_mutex_unlock(&cl_mutex_log_lock);
}
static void after_release_the_mutex(pthread_mutex_t* mutex)
{
int i, j;
cl_mutex_log_item item = NULL;
int still_used;
pthread_mutex_lock(&cl_mutex_log_lock);
for (i = 0; i < cl_mutex_log_map_size; i++) {
if (cl_mutex_log_map[i]->mutex == mutex) {
item = cl_mutex_log_map[i];
break;
}
}
assert(item);
item->holder.file = NULL;
item->holder.line = 0;
still_used = 0;
for (j = 0; j < 8; j++) {
if (item->waiter[j].file != NULL) {
still_used = 1;
break;
}
}
if (still_used == 0) {
cl_mutex_log_map[i] = NULL;
free(item);
cl_mutex_log_num--;
}
pthread_mutex_unlock(&cl_mutex_log_lock);
}
static int try_to_get_the_mutex(pthread_mutex_t* mutex)
{
struct timespec abs_time;
clock_gettime(CLOCK_REALTIME , &abs_time);
// so many seconds, still not get, we think deadlock happened.
abs_time.tv_sec += 25;
if (pthread_mutex_timedlock(mutex, &abs_time) != 0) {
return 0;
}
return 1;
}
LOCAL void cl_mutex_lock(pthread_mutex_t* mutex, char* file, int line)
{
assert(mutex);
int nth = before_get_the_mutex(mutex, file, line);
if (try_to_get_the_mutex(mutex) == 0) {
// Consider to be dead locked.
}
after_get_the_mutex(mutex, file, line, nth);
}
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