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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
typedef union memory_hdr_u memory_hdr_t;
union memory_hdr_u {
struct {
const char *filename;
size_t line;
size_t size_of_memory;
memory_hdr_t *older, *newer;
} info; /* info */
unsigned long junk; /* force maximal alignment */
};
/**
* global list of allocations
*
* thread-save through mutex
*/
static memory_hdr_t *allocations = NULL;
/**
* Mutex to ensure, all functions are thread-save
*/
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* described in header
*/
void * allocate(size_t bytes, char * file,int line)
{
memory_hdr_t *allocated_memory = malloc(sizeof(memory_hdr_t) + bytes);
if (allocated_memory == NULL)
{
return allocated_memory;
}
pthread_mutex_lock( &mutex);
allocated_memory->info.line = line;
allocated_memory->info.filename = file;
allocated_memory->info.size_of_memory = bytes;
allocated_memory->info.older = allocations;
if (allocations != NULL)
{
allocations->info.newer = allocated_memory;
}
allocations = allocated_memory;
allocated_memory->info.newer = NULL;
/* fill memory with zero's */
memset(allocated_memory+1, '\0', bytes);
pthread_mutex_unlock( &mutex);
/* real memory starts after header */
return (allocated_memory+1);
}
/*
* described in header
*/
void free_pointer(void * pointer)
{
memory_hdr_t *allocated_memory;
if (pointer == NULL)
{
return;
}
pthread_mutex_lock( &mutex);
allocated_memory = ((memory_hdr_t *)pointer) - 1;
if (allocated_memory->info.older != NULL)
{
assert(allocated_memory->info.older->info.newer == allocated_memory);
allocated_memory->info.older->info.newer = allocated_memory->info.newer;
}
if (allocated_memory->info.newer == NULL)
{
assert(allocated_memory == allocations);
allocations = allocated_memory->info.older;
}
else
{
assert(allocated_memory->info.newer->info.older == allocated_memory);
allocated_memory->info.newer->info.older = allocated_memory->info.older;
}
pthread_mutex_unlock( &mutex);
free(allocated_memory);
}
/*
* described in header
*/
void * reallocate(void * old, size_t bytes, char * file,int line)
{
memory_hdr_t *allocated_memory;
if (old == NULL)
{
return NULL;
}
pthread_mutex_lock( &mutex);
allocated_memory = ((memory_hdr_t *)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,allocated_memory->info.size_of_memory);
pthread_mutex_unlock( &mutex);
return new_space;
}
/*
* described in header
*/
void report_memory_leaks(void)
{
memory_hdr_t *p = allocations,
*pprev = NULL;
unsigned long n = 0;
pthread_mutex_lock( &mutex);
while (p != NULL)
{
assert(pprev == p->info.newer);
pprev = p;
p = p->info.older;
n++;
if (p == NULL || pprev->info.filename != p->info.filename)
{
if (n != 1)
fprintf(stderr,"leak: %lu * File %s, Line %d\n", n, pprev->info.filename,pprev->info.line);
else
fprintf(stderr,"leak: File %s, Line %d\n", pprev->info.filename,pprev->info.line);
n = 0;
}
}
pthread_mutex_unlock( &mutex);
}
#endif
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