Non debuggable thread is trying to suspend execution

Question

Hi all,
I have a program that is using the WinMM library to sample the wave-in in a buffer, for 0.015s every 0.030s.
The program works OK, but every now and then I get an error saying:
"A non-debuggable thread is trying to suspend execution at address 7C90120E.
Do you want to suspend execution?"
You can choose whether or not to suspend, and in either case the error will come again.
Sometimes it runs without a problem for about 30s, sometimes I get the error every second, so at very unregular intervals.
I tried to do the sampling in a seperate thread but it doesn't make any difference (conceirning the error)
I'm using LABWindows/CVI 9.0 at WindowsXP Professional 2002 sp3, using Windows SDK 7.1.
Does anyone know what could be the problem?
Regards, Dirk
Solved!
Go to Solution.

Answer 1

In the main program I initialize the Format:
pFormat.wFormatTag=WAVE_FORMAT_PCM; // simple, uncompressed format
pFormat.nChannels=1; // 1=mono, 2=stereo
pFormat.nSamplesPerSec=sampleRate; // 44100
pFormat.nAvgBytesPerSec=sampleRate*2; // = nSamplesPerSec * n.Channels * wBitsPerSample/8
pFormat.nBlockAlign=2; // = n.Channels * wBitsPerSample/8
pFormat.wBitsPerSample=16; // 16 for high quality, 8 for telephone-grade
pFormat.cbSize=0;
result = waveInOpen(&hWaveIn, WAVE_MAPPER,&pFormat,
0L, 0L, WAVE_FORMAT_DIRECT);
 Then every 0.030s or so, getsound() is called at a TIMER_TICK_EVENT
 getsound() is:
void getsound(void)
WAVEHDR WaveInHdr;
// Set up and prepare header for input
WaveInHdr.lpData = (LPSTR)waveIn;
WaveInHdr.dwBufferLength = NUMPTS*2;
WaveInHdr.dwBytesRecorded=0;
WaveInHdr.dwUser = 0L;
WaveInHdr.dwFlags = 0L;
WaveInHdr.dwLoops = 0L;
waveInPrepareHeader(hWaveIn, &WaveInHdr, sizeof(WaveInHdr));
// Insert a wave input buffer
result = waveInAddBuffer(hWaveIn, &WaveInHdr, sizeof(WaveInHdr));
if (result)
Fmt (ErrorMessage, "%s","Failed to read block from device");
MessagePopup ("Audio Error", ErrorMessage);
// Commence sampling input
result = waveInStart(hWaveIn);
if (result)
Fmt (ErrorMessage, "%s","Failed to start recording");
MessagePopup ("Audio Error", ErrorMessage);
// Wait until finished recording
do {} while (waveInUnprepareHeader(hWaveIn, &WaveInHdr, sizeof(WaveInHdr))==WAVERR_STILLPLAYING);
Hope this helps!