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/**
* @file allocator.c
*
* @brief Memory allocation with LEAK_DETECTION support
*
* Thread-save implementation
*/
/*
* Copyright (C) 2005 Jan Hutter, Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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
* for more details.
*/
#include <stddef.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <assert.h>
#include <stdio.h>
#include "allocator.h"
#ifdef LEAK_DETECTIVE
union mhdr {
struct {
const char *file;
size_t line;
size_t length;
union mhdr *older, *newer;
} i; /* info */
unsigned long junk; /* force maximal alignment */
};
static union mhdr *allocs = NULL;
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/**
* Allocates memory with LEAK_DETECTION and returns an empty data area filled with zeros
*
* use this function not directly, only with assigned macros
*/
void * allocate(size_t bytes, char * file,int line)
{
union mhdr *p = malloc(sizeof(union mhdr) + bytes);
if (p == NULL)
{
return p;
}
pthread_mutex_lock( &mutex);
p->i.line = line;
p->i.file = file;
p->i.length = bytes;
p->i.older = allocs;
if (allocs != NULL)
allocs->i.newer = p;
allocs = p;
p->i.newer = NULL;
memset(p+1, '\0', bytes);
pthread_mutex_unlock( &mutex);
return p+1;
}
/**
* Frees memory with LEAK_DETECTION
*
* use this function not directly, only with assigned macros
*/
void free_pointer(void * pointer)
{
union mhdr *p;
if (pointer == NULL)
{
return;
}
pthread_mutex_lock( &mutex);
p = ((union mhdr *)pointer) - 1;
if (p->i.older != NULL)
{
assert(p->i.older->i.newer == p);
p->i.older->i.newer = p->i.newer;
}
if (p->i.newer == NULL)
{
assert(p == allocs);
allocs = p->i.older;
}
else
{
assert(p->i.newer->i.older == p);
p->i.newer->i.older = p->i.older;
}
pthread_mutex_unlock( &mutex);
free(p);
}
/**
* Reallocates memory with LEAK_DETECTION
*
* use this function not directly, only with assigned macros
*/
void * reallocate(void * old, size_t bytes, char * file,int line)
{
union mhdr *p;
if (old == NULL)
{
return NULL;
}
pthread_mutex_lock( &mutex);
p = ((union mhdr *)old) - 1;
void *new_space = allocate(bytes,file,line);
if (new_space == NULL)
{
free_pointer(old);
pthread_mutex_unlock( &mutex);
return NULL;
}
memcpy(new_space,old,p->i.length);
pthread_mutex_unlock( &mutex);
return new_space;
}
/**
* Reports memory-leaks
*
*/
void report_memory_leaks(void)
{
union mhdr
*p = allocs,
*pprev = NULL;
unsigned long n = 0;
pthread_mutex_lock( &mutex);
while (p != NULL)
{
assert(pprev == p->i.newer);
pprev = p;
p = p->i.older;
n++;
if (p == NULL || pprev->i.file != p->i.file)
{
if (n != 1)
fprintf(stderr,"leak: %lu * File %s, Line %d\n", n, pprev->i.file,pprev->i.line);
else
fprintf(stderr,"leak: File %s, Line %d\n", pprev->i.file,pprev->i.line);
n = 0;
}
}
pthread_mutex_unlock( &mutex);
}
#endif
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