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/*
VASP modular - vector assembling signal processor / objects for Max/MSP and PD
Copyright (c) 2002 Thomas Grill (xovo@gmx.net)
For information on usage and redistribution, and for a DISCLAIMER OF ALL
WARRANTIES, see the file, "license.txt," in this distribution.
*/
#include "main.h"
#include "buflib.h"
#include <stdio.h>
#define LIBTICK 100 // tick time in ms
#define LIBTOL 2 // how many ticks till release
#define REUSE_MAXLOSEREL 0.1 // max. fraction of lost buffer size
#define REUSE_MAXLOSEABS 10000 // max. lost buffer size
#define LIBMAGIC 12349876L // magic number for s_thing data check
class FreeEntry
{
public:
FreeEntry(t_symbol *s): sym(s),nxt(NULL) {}
t_symbol *sym;
FreeEntry *nxt;
};
class BufEntry
{
public:
BufEntry(t_symbol *s,I fr,BL zero = true);
~BufEntry();
V IncRef();
V DecRef();
// UL magic;
t_symbol *sym;
I refcnt,tick;
BufEntry *nxt;
I alloc,len;
S *data;
};
static BufEntry *libhead = NULL,*libtail = NULL;
static FreeEntry *freehead = NULL,*freetail = NULL;
static I libcnt = 0,libtick = 0;
static t_clock *libclk = NULL;
#ifdef FLEXT_THREADS
static flext::ThrMutex libmtx;
#endif
static V FreeLibSym(t_symbol *s);
BufEntry::BufEntry(t_symbol *s,I fr,BL zero):
sym(s), //magic(LIBMAGIC),
alloc(fr),len(fr),data(new S[fr]),
refcnt(0),nxt(NULL)
{
if(zero) flext::ZeroMem(data,len*sizeof(*data));
// ASSERT(!flext_base::GetThing(sym));
// flext_base::SetThing(sym,this);
}
BufEntry::~BufEntry()
{
if(sym) FreeLibSym(sym);
if(data) delete[] data;
}
V BufEntry::IncRef() { ++refcnt; }
V BufEntry::DecRef() { --refcnt; tick = libtick; }
static BufEntry *FindInLib(const t_symbol *s)
{
BufEntry *e;
for(e = libhead; e && e->sym != s; e = e->nxt) (void)0;
return e?e:NULL;
}
VBuffer *BufLib::Get(const VSymbol &s,I chn,I len,I offs)
{
BufEntry *e = FindInLib(s.Symbol());
if(e)
return new ImmBuf(e,len,offs);
else
return new SysBuf(s,chn,len,offs);
}
V BufLib::IncRef(t_symbol *s)
{
if(s) {
BufEntry *e = FindInLib(s);
if(e) e->IncRef();
}
}
V BufLib::DecRef(t_symbol *s)
{
if(s) {
BufEntry *e = FindInLib(s);
if(e) e->DecRef();
}
}
static t_symbol *GetLibSym()
{
if(freehead) {
// reuse from free-list
FreeEntry *r = freehead;
freehead = r->nxt;
if(!freehead) freetail = NULL;
t_symbol *s = r->sym;
delete r;
return s;
}
else {
// allocate new symbol
char tmp[20];
#ifdef __MWERKS__
std::
#endif
sprintf(tmp,"vasp!%04i",libcnt); //! \todo what if libcnt has > 4 digits?
libcnt++;
return gensym(tmp);
}
clock_delay(libclk,LIBTICK);
}
static V FreeLibSym(t_symbol *sym)
{
FreeEntry *f = new FreeEntry(sym);
if(!freehead) freehead = f;
else freetail->nxt = f;
freetail = f;
}
static V LibTick(V *)
{
#ifdef FLEXT_THREADS
libmtx.Lock();
#endif
// collect garbage
BufEntry *e,*p;
for(p = NULL,e = libhead; e; ) {
if(e->refcnt <= 0 && e->tick+LIBTOL < libtick) {
ASSERT(e->refcnt == 0);
BufEntry *n = e->nxt;
if(p) p->nxt = n;
else libhead = n;
if(!n) libtail = p;
else e->nxt = NULL;
delete e;
e = n;
}
else
p = e,e = e->nxt;
}
++libtick;
clock_delay(libclk,LIBTICK);
#ifdef FLEXT_THREADS
libmtx.Unlock();
#endif
}
BufEntry *BufLib::NewImm(I fr,BL zero)
{
if(!libclk) {
libclk = (t_clock *)clock_new(NULL,(t_method)LibTick);
clock_delay(libclk,LIBTICK);
}
t_symbol *s = NULL;
// do {
s = GetLibSym();
// } while(s->s_thing);
BufEntry *entry = new BufEntry(s,fr,zero);
#ifdef FLEXT_THREADS
libmtx.Lock();
#endif
if(libtail) libtail->nxt = entry;
else libhead = entry;
libtail = entry;
#ifdef FLEXT_THREADS
libmtx.Unlock();
#endif
return entry;
}
static F reuse_maxloserel = (F)REUSE_MAXLOSEREL;
static I reuse_maxloseabs = REUSE_MAXLOSEABS;
BufEntry *BufLib::Resize(BufEntry *e,I fr,BL keep,BL zero)
{
if(e->alloc >= fr && fr >= e->alloc*(1-reuse_maxloserel) && fr >= (e->alloc-reuse_maxloseabs)) {
// reuse buffer
e->len = fr;
}
else {
S *nd = new S[fr];
if(keep) {
I l = fr;
if(e->len < l) {
l = e->len;
if(zero) flext::ZeroMem(nd+l,(fr-l)*sizeof(*nd));
}
flext::CopyMem(nd,e->data,l*sizeof(*nd));
}
delete[] e->data;
e->data = nd;
e->len = e->alloc = fr;
}
return e;
}
ImmBuf::ImmBuf(I len):
VBuffer(0,len),
entry(BufLib::NewImm(len))
{}
ImmBuf::ImmBuf(BufEntry *e,I len,I offs):
VBuffer(0,len,offs),
entry(e)
{}
VSymbol ImmBuf::Symbol() const { return entry->sym; }
I ImmBuf::Frames() const { return entry->len; }
V ImmBuf::Frames(I fr,BL keep) { entry = BufLib::Resize(entry,fr,keep); }
S *ImmBuf::Data() { return entry->data; }
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