206 lines
6.8 KiB
C++
206 lines
6.8 KiB
C++
/*++
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Copyright (C) 1995-1999 Microsoft Corporation
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Module Name:
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appmema.cpp
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Abstract:
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This file contains the memory allocation function "wrappers"
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to allow monitoring of the memory usage by a performance monitoring
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application (e.g. PERFMON).
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--*/
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#ifdef DO_TIMING_BUILD
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#include <windows.h>
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#include <assert.h>
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#include "appmema.h"
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HANDLE ThisDLLHandle = NULL;
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HANDLE hAppMemSharedMemory = NULL; // Handle of counter Shared Memory
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PAPPMEM_DATA_HEADER pDataHeader = NULL; // pointer to header of shared mem
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PAPPMEM_INSTANCE pAppData = NULL; // pointer to the app data for this app
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static
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BOOL
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DllProcessAttach (
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IN HANDLE DllHandle
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)
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/*++
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Description:
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Initializes the interface to the performance counters DLL by
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opening the Shared Memory file used to communicate statistics
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from the application to the counter DLL. If the Shared memory
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file does not exist, it is created, formatted and initialized.
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If the file has already been created and formatted, then the
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next available APPMEM_INSTANCE entry is moved from the free list
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to the InUse list and the corresponding pointer is saved for
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subsequent use by this application
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--*/
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{
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LONG status;
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TCHAR szMappedObject[] = SHARED_MEMORY_OBJECT_NAME;
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DWORD dwBytes;
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// save this DLL handle
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ThisDLLHandle = DllHandle;
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// disable thread attach & detach calls to save the overhead
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// since we don't care about them.
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DisableThreadLibraryCalls (DllHandle);
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// open & initialize shared memory file
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SetLastError (ERROR_SUCCESS); // just to clear it out
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// open/create shared memory used by the application to pass performance values
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status = GetSharedMemoryDataHeader (
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&hAppMemSharedMemory, NULL, &pDataHeader,
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FALSE); // read/write access is required
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// here the memory block should be initialized and ready for use
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if (status == ERROR_SUCCESS) {
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if (pDataHeader->dwFirstFreeOffset != 0) {
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// then there are blocks left so get the next free
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pAppData = FIRST_FREE(pDataHeader);
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// update free list to make next item the first in list
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pDataHeader->dwFirstFreeOffset = pAppData->dwOffsetOfNext;
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// insert the new item into the head of the in use list
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pAppData->dwOffsetOfNext = pDataHeader->dwFirstInUseOffset;
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pDataHeader->dwFirstInUseOffset = (DWORD)((LPBYTE)pAppData -
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(LPBYTE)pDataHeader);
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// now initialize this instance's data
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pAppData->dwProcessId = GetCurrentProcessId(); // id of process using this instance
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dwBytes = sizeof (APP_DATA_SAMPLE) * TD_TOTAL;
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dwBytes += sizeof (DWORD) * DD_TOTAL;
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memset (&pAppData->TimeData[0], 0, dwBytes);
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pDataHeader->dwInstanceCount++; // increment count
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} else {
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// no more free slots left
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assert (pDataHeader->dwFirstFreeOffset != 0);
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}
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} else {
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// unable to open shared memory file
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// even though this is an error we should return true so as to
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// not abort the application. No performance data will be
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// collected though.
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}
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return TRUE;
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}
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static
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BOOL
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DllProcessDetach (
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IN HANDLE DllHandle
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)
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{
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PAPPMEM_INSTANCE pPrevItem;
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// remove instance for this app
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if ((pAppData != NULL) && (pDataHeader != NULL)) {
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// zero the fields out first
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memset (pAppData, 0, sizeof (APPMEM_INSTANCE));
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// move from in use (busy) list back to the free list
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if ((pDataHeader->dwFirstFreeOffset != 0) && (pDataHeader->dwFirstInUseOffset != 0)) {
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// find previous item in busy list
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if (FIRST_INUSE(pDataHeader) != pAppData) {
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// not the first so walk down the list
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pPrevItem = FIRST_INUSE(pDataHeader);
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while (APPMEM_INST(pDataHeader, pPrevItem->dwOffsetOfNext) != pAppData) {
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pPrevItem = APPMEM_INST(pDataHeader, pPrevItem->dwOffsetOfNext);
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if (pPrevItem->dwOffsetOfNext == 0) break; // end of list
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}
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if (APPMEM_INST(pDataHeader, pPrevItem->dwOffsetOfNext) == pAppData) {
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APPMEM_INST(pDataHeader, pPrevItem->dwOffsetOfNext)->dwOffsetOfNext =
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pAppData->dwOffsetOfNext;
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} else {
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// it was never in the busy list (?!?)
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}
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} else {
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// this is the first in the list so update it
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pDataHeader->dwFirstInUseOffset = pAppData->dwOffsetOfNext;
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}
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// here, pAppData has been removed from the InUse list and now
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// it must be inserted back at the beginning of the free list
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pAppData->dwOffsetOfNext = pDataHeader->dwFirstFreeOffset;
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pDataHeader->dwFirstFreeOffset = (DWORD)((LPBYTE)pAppData - (LPBYTE)pDataHeader);
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}
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}
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// decrement instance counter
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pDataHeader->dwInstanceCount--; // decrement count
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// close shared memory file handle
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if (hAppMemSharedMemory != NULL) CloseHandle (hAppMemSharedMemory);
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// clear pointers
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hAppMemSharedMemory = NULL;
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pDataHeader = NULL;
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pAppData = NULL;
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return TRUE;
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}
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BOOL
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__stdcall
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AppPerfOpen(HINSTANCE hInstance)
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{
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return DllProcessAttach (hInstance);
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}
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BOOL
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__stdcall
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AppPerfClose(HINSTANCE hInstance)
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{
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return DllProcessDetach (hInstance);
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}
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void
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UpdateAppPerfTimeData (
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DWORD dwItemId,
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DWORD dwStage
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)
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{
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LONGLONG llTime;
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assert (dwItemId < TD_TOTAL);
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QueryPerformanceCounter ((LARGE_INTEGER *)&llTime);
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// GetSystemTimeAsFileTime ((LPFILETIME)&llTime);
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if (dwStage == TD_BEGIN) {
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assert (pAppData->TimeData[dwItemId].dw1 == 0); // this shouldn't be called while timing
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pAppData->TimeData[dwItemId].ll1 = llTime; // save start time
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pAppData->TimeData[dwItemId].dw1++; // indicate were counting
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} else {
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assert (pAppData->TimeData[dwItemId].dw1 == 1); // this should only be called while timing
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pAppData->TimeData[dwItemId].ll0 += llTime; // add in current time
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// then remove the start time
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pAppData->TimeData[dwItemId].ll0 -= pAppData->TimeData[dwItemId].ll1;
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// increment completed operation count
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pAppData->TimeData[dwItemId].dw0++;
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// decrement busy count
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pAppData->TimeData[dwItemId].dw1--;
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}
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return;
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}
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void
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UpdateAppPerfDwordData (
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DWORD dwItemId,
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DWORD dwValue
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)
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{
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assert (dwItemId < DD_TOTAL);
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pAppData->DwordData[dwItemId] = dwValue;
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return;
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}
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#endif |