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Possible Sound Manager memory leak
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Possible Sound Manager memory leak


  • Subject: Possible Sound Manager memory leak
  • From: EJ Campbell <email@hidden>
  • Date: Sat, 31 Aug 2002 16:59:14 -0700

I believe the following code snippet exposes a memory leak in Mac OS
X's Sound Manager API. As it runs, the process will *slowly* consume
more and more memory. The same leak occurs both on 10.1 and 10.2.

#include <iostream>
#include <Carbon/Carbon.h>

int main (int argc, const char * argv[]) {
std::cout << "Iterating 1,000,000 times. Examine memory usage using
top...\n";
for(long i = 0; i < 1000000; i++)
{
long writeRef;
short on = 1;
SPBOpenDevice("\p",siWritePermission,&writeRef);
SPBSetDeviceInfo (writeRef, siContinuous, (Ptr) &on);
SPBCloseDevice(writeRef);
}
std::cout << "Iteration finished\n";
return 0;
}

Running leaks on the process shows several leaks here:
Call stack: [thread ffffffff]: | 0x0 | start | _start | main |
SPBOpenDevice | OpenSinp | SinpMgr::OpenSinp(unsigned char const*,
ComponentInstanceRecord*&) const | OpenAComponent | CallComponentOpen |
HALInputComponentDispatch | HALInputOpen | InitializeHALInput |
InitializeBuffers | NewPtr | malloc_zone_malloc

Is this a legitimate memory leak, and if so, is it already known?

Thanks,
EJ
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