Do you have a score line to activate the instrument?
If not, you can add

csoundInputMessage(csound, "i1 0 10000");

just before you start the thread.

Victor

----- Original Message -----
From: Josh Brown <lovell_josh@hotmail.co.uk>
Date: Tuesday, April 27, 2010 3:34 am
Subject: [Cs-dev] Performance thread using the csound api in c.
To: csound-devel@lists.sourceforge.net

> 
> Hello, not sure if I'm at the appropriate place but can anyone 
> tell me why I don't get any sound with this program:
> 
> #include "H/csound.h"
> 
> #include 
> uintptr_t csThread(void *clientData);
> typedef struct {
> 
> int 
> result;                                	//result of csoundCompile()
> 
> CSOUND* 
> csound;                        	//instane of Csound
> 
> int 
> PERF_STATUS;                	//tells us if Csound is running
> 
> }userData;
> //------------------------------------------------------------
> 
> int main(int argc, char *argv[])
> 
> {
> 
> int userInput=200;
> 
> void* ThreadID;
> 
> userData* ud;
> 
> ud = (userData *)malloc(sizeof(userData));
> 
> MYFLT* pvalue;
> 
> ud->csound=csoundCreate(NULL);
> 
> csoundInitialize(&argc, &argv, 0);
> 
> ud->result=csoundCompile(ud->csound,argc,argv);
> 
> if(!ud->result)
> 
>    {
> 
>    ud->PERF_STATUS=1;
> 
>    ThreadID = csoundCreateThread(csThread, (void*)ud);
> 
>    }
> 
> else
> 
> {
> 
> printf("csoundCompiled returned an error");
> 
> return 0;
> 
> }
> 
> printf("\nEnter a pitch in Hz(0 to Exit) and type return\n");
> 
> while(userInput!=0)
> 
>       {
> 
>       if(csoundGetChannelPtr(ud-
> >csound, &pvalue, "pitch", CSOUND_INPUT_CHANNEL | 
> CSOUND_CONTROL_CHANNEL)==0);
>       *pvalue = (MYFLT)userInput;
> 
>       scanf("%d", &userInput);
> 
> 	printf("Okay, %d\n",userInput);
> 
>         }
> 
> ud->PERF_STATUS=0;
> 
> return ud->result;
> 
> }
> 
> //-------------------------------------------------------------
> 
> //definition of our performance thread function
> 
> uintptr_t csThread(void *data)
> 
> {
> 
>          userData* udata 
> = (userData*)data;
> 
>          if(!udata->result)
> 
>             {
> 
>                     while((csoundPerformKsmps(udata->csound) == 0)
> 
>                            &&(udata->PERF_STATUS==1));
> 
>                   csoundDestroy(udata->csound);
> 
>             }
> 
>          udata-
> >PERF_STATUS = 0;
> 
>           return 1;
> 
> }
> 
> //---------------------------------------------------------------
> -----------------------------
> 
> ... I load this instrument file and get no sound:
> 
> instr 1
> 
> kval chnget "pitch"
> 
> a1 oscil 10000, kval, 1
> 
> out a1
> 
> endin
>                                                
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Dr Victor Lazzarini, Senior Lecturer, Dept. of Music,
National University of Ireland, Maynooth