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/*
flext - C++ layer for Max/MSP and pd (pure data) externals
Copyright (c) 2001,2002 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.
*/
/*! \file flthr.cpp
\brief Implementation of the flext thread functionality.
*/
#ifdef FLEXT_THREADS
#include "flext.h"
#include "flinternal.h"
#ifdef MAXMSP
#define SCHEDTICK 1
#endif
#ifdef NT
#include <windows.h>
#endif
#include <errno.h>
bool flext_base::StartThread(void *(*meth)(thr_params *p),thr_params *p,char *methname)
{
static bool init = false;
static pthread_attr_t attr;
#ifdef _DEBUG
if(!p) {
ERRINTERNAL();
return false;
}
#endif
if(!init) {
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr,PTHREAD_CREATE_DETACHED);
init = true;
}
// set thread priority one point below normal
// so thread construction won't disturb real-time audio
pthread_t id = pthread_self();
sched_param parm;
int policy;
pthread_getschedparam(id,&policy,&parm);
int prio = parm.sched_priority;
int schmin = sched_get_priority_min(policy);
if(prio > schmin) {
parm.sched_priority = prio-1;
pthread_setschedparam(id,policy,&parm);
}
pthread_t thrid;
int ret = pthread_create (&thrid,&attr,(void *(*)(void *))meth,p);
// set thread priority back to normal
parm.sched_priority = prio;
pthread_setschedparam(id,policy,&parm);
if(ret) {
#ifdef _DEBUG
error((char *)(ret == EAGAIN?"%s - Unsufficient resources to launch thread!":"%s - Could not launch method!"),methname);
#endif
delete p;
return false;
}
else {
#ifdef MAXMSP
sched_yield();
#endif
return true;
}
}
bool flext_base::PushThread()
{
tlmutex.Lock();
// make an entry into thread list
thr_entry *nt = new thr_entry;
if(thrtail) thrtail->nxt = nt;
else thrhead = nt;
thrtail = nt;
{
#ifdef NT
// set detached thread to lower priority class
DWORD err;
HANDLE thr = GetCurrentThread();
DWORD cl = GetThreadPriority(thr);
if(!cl && (err = GetLastError()))
post("flext - error getting thread priority");
else {
BOOL ret = SetThreadPriority(thr,cl-2);
if(!ret) {
err = GetLastError();
if(!err) post("flext - error setting thread priority");
}
}
#else
// set initial detached thread priority two points below normal
sched_param parm;
int policy;
if(pthread_getschedparam(nt->thrid,&policy,&parm))
post("flext - can't get thread parameters");
int prio = parm.sched_priority;
int schmin = sched_get_priority_min(policy);
if(prio > schmin) {
parm.sched_priority = prio-2;
if(pthread_setschedparam(nt->thrid,policy,&parm))
post("flext - can't set thread parameters");
}
#endif
}
tlmutex.Unlock();
#ifdef MAXMSP
clock_delay(yclk,0);
#endif
return true;
}
void flext_base::PopThread()
{
tlmutex.Lock();
pthread_t id = pthread_self();
thr_entry *prv = NULL,*ti;
for(ti = thrhead; ti; prv = ti,ti = ti->nxt)
if(ti->Is()) break;
if(ti) {
if(prv)
prv->nxt = ti->nxt;
else
thrhead = ti->nxt;
if(thrtail == ti) thrtail = prv;
ti->nxt = NULL;
delete ti;
}
else {
#ifdef _DEBUG
post("%s - INTERNAL ERROR: Thread not found!",thisName());
#endif
}
tlmutex.Unlock();
}
#ifdef MAXMSP
void flext_base::YTick(flext_base *th)
{
clock_delay(th->yclk,0);
qelem_set(th->qclk);
sched_yield();
}
#endif
flext_base::thrid_t flext_base::GetThreadId()
{
return pthread_self();
}
bool flext_base::ChangePriority(int dp,thrid_t id)
{
sched_param parm;
int policy;
if(pthread_getschedparam(id,&policy,&parm) < 0) {
#ifdef _DEBUG
post("flext - failed to get parms");
#endif
return false;
}
else {
parm.sched_priority += dp;
if(pthread_setschedparam(id,policy,&parm) < 0) {
#ifdef _DEBUG
post("flext - failed to change priority");
#endif
return false;
}
}
return true;
}
int flext_base::GetPriority(thrid_t id)
{
sched_param parm;
int policy;
if(pthread_getschedparam(id,&policy,&parm) < 0) {
#ifdef _DEBUG
post("flext - failed to get parms");
#endif
return -1;
}
return parm.sched_priority;
}
bool flext_base::SetPriority(int p,thrid_t id)
{
sched_param parm;
int policy;
if(pthread_getschedparam(id,&policy,&parm) < 0) {
#ifdef _DEBUG
post("flext - failed to get parms");
#endif
return false;
}
else {
parm.sched_priority = p;
if(pthread_setschedparam(id,policy,&parm) < 0) {
#ifdef _DEBUG
post("flext - failed to change priority");
#endif
return false;
}
}
return true;
}
flext_base::thr_params::thr_params(flext_base *c,int n): cl(c),var(new _data[n]) {}
flext_base::thr_params::~thr_params() { if(var) delete[] var; }
void flext_base::thr_params::set_any(const t_symbol *s,int argc,const t_atom *argv) { var[0]._any.args = new AtomAnything(s,argc,argv); }
void flext_base::thr_params::set_list(int argc,const t_atom *argv) { var[0]._list.args = new AtomList(argc,argv); }
#endif // FLEXT_THREADS
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