RegisterWaitForSingleObject & memory leaks
- From: "stef" <stef.pellegrino@xxxxxxxxx>
- Date: 19 Oct 2005 12:47:47 -0700
Hello guys,
I've "found" the pretty nice "RegisterWaitForSingleObject" to notify
(for example) a child death.
But, with the example below, I don't know why and where, I noticed I
lost some significant handles after all children stops !?
I think I'm not using the function correctly but where ?
Could you help me please...
note :
the "child.exe" is a simple puts("hello"); while(1);
#include <windows.h>
BOOL (WINAPI *_RegisterWaitForSingleObject)(PHANDLE, HANDLE, PVOID,
PVOID, ULONG, ULONG);
BOOL (WINAPI *_UnregisterWait)(HANDLE);
typedef struct
{
DWORD ProcessId;
HANDLE hProcess;
HANDLE hThread;
HANDLE hNew;
} S_PI;
/**
*
*/
main()
{
HINSTANCE h;
int i;
STARTUPINFO si;
PROCESS_INFORMATION pi;
S_PI *pInfo;
BOOL b;
h = LoadLibrary("kernel32.dll");
_RegisterWaitForSingleObject = GetProcAddress(h,
"RegisterWaitForSingleObject");
_UnregisterWait = GetProcAddress(h, "UnregisterWait");
ZeroMemory(&si, sizeof(STARTUPINFO));
si.cb= sizeof(STARTUPINFO);
si.dwFlags|= STARTF_USESTDHANDLES;
// at this moment, ProcessExplorer said 10 handles used
//
for(i=0; i<12; i++)
{
pInfo = (S_PI *) malloc(sizeof(S_PI));
if (CreateProcess(NULL, "c:/child.exe", NULL, NULL, FALSE, 0, NULL,
NULL, &si, &pi)==0)
{
puts("error");
exit(1);
}
pInfo->ProcessId = pi.dwProcessId;
pInfo->hProcess = pi.hProcess;
pInfo->hThread = pi.hThread;
b = _RegisterWaitForSingleObject(&pInfo->hNew, pi.hProcess, fct,
(PVOID) pInfo, INFINITE, 0x00000008);
}
while(1);
scanf(">>%d", &i);
FreeLibrary(h);
}
/**
* when the 12 children are stopped, I "stay" between 15/22 handles used
and
* never down to 10 handles !!
*
*/
void NTAPI fct(void *ptr, BOOLEAN TimerOrWaitFired)
{
S_PI *p = (S_PI *) ptr;
printf("child %d stops\n", p->ProcessId);
CloseHandle(p->hProcess);
CloseHandle(p->hThread);
_UnregisterWait(p->hNew);
free(ptr);
CloseHandle(p->hNew);
}
.
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