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//=========================================================
// MusE
// Linux Music Editor
// $Id: memory.h,v 1.4.2.3 2009/12/15 22:08:50 spamatica Exp $
//
// (C) Copyright 2003-2004 Werner Schweer (ws@seh.de)
//=========================================================
#ifndef __MEMORY_H__
#define __MEMORY_H__
#include <stdio.h>
#include <stdlib.h>
#include <cstddef>
#include <map>
// most of the following code is based on examples
// from Bjarne Stroustrup: "Die C++ Programmiersprache"
//---------------------------------------------------------
// Pool
//---------------------------------------------------------
class Pool {
struct Verweis {
Verweis* next;
};
struct Chunk {
enum { size = 4 * 1024 };
Chunk* next;
char mem[size];
};
enum { dimension = 21 };
Chunk* chunks[dimension];
Verweis* head[dimension];
Pool(Pool&);
void operator=(Pool&);
void grow(int idx);
public:
Pool();
~Pool();
void* alloc(size_t n);
void free(void* b, size_t n);
};
//---------------------------------------------------------
// alloc
//---------------------------------------------------------
inline void* Pool::alloc(size_t n)
{
if (n == 0)
return 0;
int idx = ((n + sizeof(unsigned long) - 1) / sizeof(unsigned long)) - 1;
if (idx >= dimension) {
printf("panic: alloc %zd %d %d\n", n, idx, dimension);
exit(-1);
}
if (head[idx] == 0)
grow(idx);
Verweis* p = head[idx];
head[idx] = p->next;
return p;
}
//---------------------------------------------------------
// free
//---------------------------------------------------------
inline void Pool::free(void* b, size_t n)
{
if (b == 0 || n == 0)
return;
int idx = ((n + sizeof(unsigned long) - 1) / sizeof(unsigned long)) - 1;
if (idx >= dimension) {
printf("panic: free %zd %d %d\n", n, idx, dimension);
exit(-1);
}
Verweis* p = static_cast<Verweis*>(b);
p->next = head[idx];
head[idx] = p;
}
extern Pool audioRTmemoryPool;
extern Pool midiRTmemoryPool;
//---------------------------------------------------------
// audioRTalloc
//---------------------------------------------------------
template <class T> class audioRTalloc
{
public:
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
pointer address(reference x) const { return &x; }
const_pointer address(const_reference x) const { return &x; }
audioRTalloc();
template <class U> audioRTalloc(const audioRTalloc<U>&) {}
~audioRTalloc() {}
pointer allocate(size_type n, void * = 0) {
return static_cast<T*>(audioRTmemoryPool.alloc(n * sizeof(T)));
}
void deallocate(pointer p, size_type n) {
audioRTmemoryPool.free(p, n * sizeof(T));
}
audioRTalloc<T>& operator=(const audioRTalloc&) { return *this; }
void construct(pointer p, const T& val) {
new ((T*) p) T(val);
}
void destroy(pointer p) {
p->~T();
}
size_type max_size() const { return size_t(-1); }
template <class U> struct rebind { typedef audioRTalloc<U> other; };
template <class U> audioRTalloc& operator=(const audioRTalloc<U>&) { return *this; }
};
template <class T> audioRTalloc<T>::audioRTalloc() {}
//---------------------------------------------------------
// midiRTalloc
//---------------------------------------------------------
template <class T> class midiRTalloc
{
public:
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
pointer address(reference x) const { return &x; }
const_pointer address(const_reference x) const { return &x; }
midiRTalloc();
template <class U> midiRTalloc(const midiRTalloc<U>&) {}
~midiRTalloc() {}
pointer allocate(size_type n, void * = 0) {
return static_cast<T*>(midiRTmemoryPool.alloc(n * sizeof(T)));
}
void deallocate(pointer p, size_type n) {
midiRTmemoryPool.free(p, n * sizeof(T));
}
midiRTalloc<T>& operator=(const midiRTalloc&) { return *this; }
void construct(pointer p, const T& val) {
new ((T*) p) T(val);
}
void destroy(pointer p) {
p->~T();
}
size_type max_size() const { return size_t(-1); }
template <class U> struct rebind { typedef midiRTalloc<U> other; };
template <class U> midiRTalloc& operator=(const midiRTalloc<U>&) { return *this; }
};
template <class T> midiRTalloc<T>::midiRTalloc() {}
#endif
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