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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>
#ifndef ALLOCATOR_C_
#define ALLOCATOR_C_
#endif
#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 */
};
/**
* private allocator_t object
*/
typedef struct private_allocator_s private_allocator_t;
struct private_allocator_s
{
/**
* public part of an allocator_t object
*/
allocator_t public;
/**
* global list of allocations
*
* thread-save through mutex
*/
memory_hdr_t *allocations;
/**
* Mutex to ensure, all functions are thread-save
*/
pthread_mutex_t mutex;
};
/**
* implements allocator_t's function allocate
*/
static void * allocate(allocator_t *allocator,size_t bytes, char * file,int line)
{
private_allocator_t *this = (private_allocator_t *) allocator;
memory_hdr_t *allocated_memory = malloc(sizeof(memory_hdr_t) + bytes);
if (allocated_memory == NULL)
{
return allocated_memory;
}
pthread_mutex_lock( &(this->mutex));
allocated_memory->info.line = line;
allocated_memory->info.filename = file;
allocated_memory->info.size_of_memory = bytes;
allocated_memory->info.older = this->allocations;
if (this->allocations != NULL)
{
this->allocations->info.newer = allocated_memory;
}
this->allocations = allocated_memory;
allocated_memory->info.newer = NULL;
/* fill memory with zero's */
memset(allocated_memory+1, '\0', bytes);
pthread_mutex_unlock(&(this->mutex));
/* real memory starts after header */
return (allocated_memory+1);
}
/**
* implements allocator_t's function free_pointer
*/
static void free_pointer(allocator_t *allocator, void * pointer)
{
private_allocator_t *this = (private_allocator_t *) allocator;
memory_hdr_t *allocated_memory;
if (pointer == NULL)
{
return;
}
pthread_mutex_lock( &(this->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 == this->allocations);
this->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(&(this->mutex));
free(allocated_memory);
}
/**
* implements allocator_t's function reallocate
*/
static void * reallocate(allocator_t *allocator, void * old, size_t bytes, char * file,int line)
{
private_allocator_t *this = (private_allocator_t *) allocator;
memory_hdr_t *allocated_memory;
if (old == NULL)
{
return NULL;
}
pthread_mutex_lock( &(this->mutex));
allocated_memory = ((memory_hdr_t *)old) - 1;
void *new_space = this->public.allocate(&(this->public),bytes,file,line);
if (new_space == NULL)
{
this->public.free_pointer(&(this->public),old);
pthread_mutex_unlock(&(this->mutex));
return NULL;
}
memcpy(new_space,old,allocated_memory->info.size_of_memory);
pthread_mutex_unlock(&(this->mutex));
return new_space;
}
/**
* implements allocator_t's function report_memory_leaks
*/
static void allocator_report_memory_leaks(allocator_t *allocator)
{
private_allocator_t *this = (private_allocator_t *) allocator;
memory_hdr_t *p = this->allocations;
memory_hdr_t *pprev = NULL;
unsigned long n = 0;
pthread_mutex_lock(&(this->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: \"%s, Line %d\"\n", pprev->info.filename,pprev->info.line);
n = 0;
}
}
pthread_mutex_unlock( &(this->mutex));
}
static private_allocator_t allocator = {
public: {allocate: allocate,
free_pointer: free_pointer,
reallocate: reallocate,
report_memory_leaks: allocator_report_memory_leaks},
allocations: NULL,
mutex: PTHREAD_MUTEX_INITIALIZER
};
//allocator.public.allocate = (void *) (allocator_t *,size_t, char *,int) allocate;
allocator_t *global_allocator = &(allocator.public);
#endif
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