Hello,
I think that I could not explain completely my problem. I will explain better my problem:
#include <utility.h>
#include <ansi_c.h>
#include <cvirte.h>
#include <userint.h>
#include "Ornek.h"
CmtThreadPoolHandle *poolHandle;
static int PANEL, testler, panelHandle;
char fileName[300]="result.txt";
int GraphLoopId=0;
int main (int argc, char *argv[])
{
if (InitCVIRTE (0, argv, 0) == 0)
return -1; /* out of memory */
if ((testler = LoadPanel (0, "Example.uir", TESTLER)) < 0)
return -1;
DisplayPanel (testler);
RunUserInterface ();
DiscardPanel (testler);
return 0;
}
//The Callback function that is expected to stop the thread
int CVICALLBACK CBStop (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:
CmtExitThreadPoolThread (0);
CmtReleaseThreadPoolFunctionID (DEFAULT_THREAD_POOL_HANDLE, GraphLoopId);
DiscardPanel(testler);
break;
case EVENT_RIGHT_CLICK:
break;
}
return 0;
}
// 'GraphLoop' function is my thread function.
static int CVICALLBACK GraphLoop (void *functionData)
{
FILE *fp;
int i;
fp=fopen(fileName,"a");
for(i=0;i<100000000;i++)
{
fprintf(fp," %d ",i)
}
return 0;
}
// The program will enter to the thread when the user clicks the 'Start' button.
int CVICALLBACK CBStart (int panel, int control, int event, void *callbackData, int eventData1, int eventData2)
{
switch (event)
{
case EVENT_COMMIT:
CmtScheduleThreadPoolFunction (DEFAULT_THREAD_POOL_HANDLE, GraphLoop, NULL, &GraphLoopId);
CmtWaitForThreadPoolFunctionCompletion (DEFAULT_THREAD_POOL_HANDLE, GraphLoopId, OPT_TP_PROCESS_EVENTS_WHILE_WAITING);
CmtReleaseThreadPoolFunctionID (DEFAULT_THREAD_POOL_HANDLE, GraphLoopId);
break;
case EVENT_RIGHT_CLICK:
break;
}
return 0;
}
int CVICALLBACK CBTestler (int panel, int event, void *callbackData,
int eventData1, int eventData2)
{
switch (event)
{
case EVENT_GOT_FOCUS:
break;
case EVENT_LOST_FOCUS:
break;
case EVENT_CLOSE:
DiscardPanel (testler);
break;
}
return 0;
}
There are 3 fuctions;
1.Thread fuction, writing numbers into a file
2.Start button callback, starting the thread.
3.Stop button callback, stopping the thread safely
There are example codes about theading and how to use threads, but all of them uses "While" loop. In c#, we successfully start and stop(by using Thread.Abort) the executing thread safely. When we back to the LabWindows/CVI, we could not find any structure to stop the thread, like in the example above, safely.
When I press the stop button, I get the following error;
NON-FATAL RUN-TIME ERROR: "Example.c", line 47, col 13, thread id 0x0000094C: Library function error (return value == -14926 [0xffffc5b2]). You can only perform this operation on a thread pool thread.
The compiler gives this error for that line:
CmtExitThreadPoolThread (0);
How can I correct this error?
