396 lines
11 KiB
C
396 lines
11 KiB
C
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/*++
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Copyright (c) 1991-92 Microsoft Corporation
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Module Name:
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winproc.c
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Abstract:
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Spooler window processing code
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Author:
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Muhunthan Sivapragasam (MuhuntS) 5-Nov-96 port of win95 code
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Environment:
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User Mode - Win32
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Notes:
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Revision History:
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BabakJ: Jan 1999, Added thread sync code to allow only one thread doing enumeration, and only
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one thread waiting. This helps performance specially when Dynamon has many Hydra ports.
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--*/
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#include "precomp.h"
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#include "local.h"
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#pragma hdrstop
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#include <cfgmgr32.h>
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static const GUID USB_PRINTER_GUID =
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{ 0x28d78fad, 0x5a12, 0x11d1,
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{ 0xae, 0x5b, 0x0, 0x0, 0xf8, 0x3, 0xa8, 0xc2 } };
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static const GUID GUID_DEVCLASS_INFRARED =
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{ 0x6bdd1fc5L, 0x810f, 0x11d0,
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{ 0xbe, 0xc7, 0x08, 0x00, 0x2b, 0xe2, 0x09, 0x2f } };
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typedef struct _DEVICE_REGISTER_INFO {
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struct _DEVICE_REGISTER_INFO *pNext;
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HANDLE hDevice;
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LPVOID pData;
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PFN_QUERYREMOVE_CALLBACK pfnQueryRemove;
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HDEVNOTIFY hNotify;
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} DEVICE_REGISTER_INFO, *PDEVICE_REGISTER_INFO;
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PDEVICE_REGISTER_INFO gpDevRegnInfo = NULL;
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VOID
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ConfigChangeThread(
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)
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{
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HINSTANCE hLib;
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VOID (*pfnSplConfigChange)();
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WaitForSpoolerInitialization();
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if ( hLib = LoadLibrary(L"localspl.dll") ) {
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if ( pfnSplConfigChange = GetProcAddress(hLib, "SplConfigChange") ) {
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pfnSplConfigChange();
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}
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FreeLibrary(hLib);
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}
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}
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VOID
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ReenumeratePortsThreadWorker(
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)
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{
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HINSTANCE hLib;
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VOID (*pfnSplReenumeratePorts)();
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WaitForSpoolerInitialization();
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if ( hLib = LoadLibrary(L"localspl.dll") ) {
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if ( pfnSplReenumeratePorts = GetProcAddress(hLib, "SplReenumeratePorts") ) {
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pfnSplReenumeratePorts();
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}
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FreeLibrary(hLib);
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////////////////////
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/////
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///// To improve performance, and prevent too many unnecessary port enumerations, specially for Hydra/Dynamon:
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/////
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///// - We want to allow only one Device Arrival thread to be doing port enumeration.
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///// - If above is happneing, we allow only one more Device Arrival thread be waiting to go in.
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///// - All other threads will be turned away, as there is no need for them to do port enumeration.
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/////
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////////////////////////////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////////////////////////////
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CRITICAL_SECTION DeviceArrivalCS; // Used to synchronize threads bringing device arrival messages.
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HANDLE ThdOutEvent; // Signalled after a thread is done doing the EnumPort work; not signaled when created.
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VOID
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ReenumeratePortsThread(
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)
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{
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static BOOL fThdIn; // TRUE if a thread is doing enum work at the moment
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static BOOL fThdWaiting; // TRUE if a 2nd thread is waiting behind the thread that is inside.
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EnterCriticalSection( &DeviceArrivalCS ); // Enter the crit section initialized for this at localspl init code
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if( fThdWaiting ) {
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LeaveCriticalSection( &DeviceArrivalCS );
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return; // A 2nd thread is already waiting to go in. No need for holding more threads.
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}
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else {
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if( fThdIn ) {
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fThdWaiting = TRUE; // There is a thread inside doing Enum work. Have the current thread wait for it to finish.
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LeaveCriticalSection( &DeviceArrivalCS );
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WaitForSingleObject( ThdOutEvent, INFINITE );
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EnterCriticalSection( &DeviceArrivalCS );
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fThdWaiting = FALSE;
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}
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fThdIn = TRUE; // The current thread is now going in to do Enum work.
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LeaveCriticalSection( &DeviceArrivalCS );
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ReenumeratePortsThreadWorker();
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EnterCriticalSection( &DeviceArrivalCS );
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fThdIn = FALSE;
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if( fThdWaiting )
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SetEvent( ThdOutEvent );
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LeaveCriticalSection( &DeviceArrivalCS );
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return;
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}
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}
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DWORD
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QueryRemove(
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HANDLE hDevice
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)
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{
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LPVOID pData = NULL;
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PFN_QUERYREMOVE_CALLBACK pfnQueryRemove = NULL;
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PDEVICE_REGISTER_INFO pDevRegnInfo;
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EnterRouterSem();
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for ( pDevRegnInfo = gpDevRegnInfo ;
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pDevRegnInfo ;
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pDevRegnInfo = pDevRegnInfo->pNext ) {
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if ( pDevRegnInfo->hDevice == hDevice ) {
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pfnQueryRemove = pDevRegnInfo->pfnQueryRemove;
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pData = pDevRegnInfo->pData;
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break;
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}
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}
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LeaveRouterSem();
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return pfnQueryRemove ? pfnQueryRemove(pData) : NO_ERROR;
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}
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DWORD
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SplProcessPnPEvent(
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DWORD dwEventType,
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LPVOID lpEventData,
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PVOID pVoid
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)
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{
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HANDLE hThread;
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DWORD dwThread, dwReturn = NO_ERROR;
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PDEV_BROADCAST_HANDLE pBroadcast;
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DBGMSG(DBG_INFO,
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("SplProcessPnPEvent: dwEventType: %d\n", dwEventType));
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switch (dwEventType) {
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case DBT_CONFIGCHANGED:
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hThread = CreateThread(NULL,
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0,
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(LPTHREAD_START_ROUTINE)ConfigChangeThread,
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NULL,
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0,
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&dwThread);
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if ( hThread )
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CloseHandle(hThread);
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break;
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case DBT_DEVICEARRIVAL:
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case DBT_DEVICEREMOVECOMPLETE:
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//
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// In case of device arrival we need to see if there are new ports
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// and in case of device removal monitors might want to mark ports
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// as removed so next reboot they do not have to enumerate them
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// ex. USB does this.
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//
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// We use the default process stack size for this thread. Currently 16KB.
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//
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hThread = CreateThread(NULL,
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0,
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(LPTHREAD_START_ROUTINE)ReenumeratePortsThread,
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NULL,
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0,
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&dwThread);
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if ( hThread )
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CloseHandle(hThread);
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break;
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case DBT_DEVICEQUERYREMOVE:
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pBroadcast = (PDEV_BROADCAST_HANDLE)lpEventData;
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//
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// These checks are to see if we really care about this
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//
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if ( !pBroadcast ||
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pBroadcast->dbch_devicetype != DBT_DEVTYP_HANDLE )
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break;
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dwReturn = QueryRemove(pBroadcast->dbch_handle);
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break;
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case DBT_SHELLLOGGEDON:
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default:
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break;
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}
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return dwReturn;
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}
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VOID
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RegisterForPnPEvents(
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VOID
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)
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{
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DEV_BROADCAST_DEVICEINTERFACE Filter;
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// Init the sync objects needed for device arrival thread management
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InitializeCriticalSection( &DeviceArrivalCS );
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ThdOutEvent = CreateEvent(NULL, FALSE, FALSE, NULL); // Manual reset, non-signaled state
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ZeroMemory(&Filter, sizeof(Filter));
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Filter.dbcc_size = sizeof(Filter);
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Filter.dbcc_devicetype = DBT_DEVTYP_DEVICEINTERFACE;
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CopyMemory(&Filter.dbcc_classguid,
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(LPGUID)&USB_PRINTER_GUID,
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sizeof(Filter.dbcc_classguid));
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if ( !RegisterDeviceNotification(ghSplHandle,
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&Filter,
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DEVICE_NOTIFY_SERVICE_HANDLE) ) {
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DBGMSG(DBG_INFO,
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("RegisterForPnPEvents: RegisterDeviceNotification failed for USB. Error %d\n",
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GetLastError()));
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} else {
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DBGMSG(DBG_WARNING,
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("RegisterForPnPEvents: RegisterDeviceNotification succesful for USB\n"));
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}
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CopyMemory(&Filter.dbcc_classguid,
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(LPGUID)&GUID_DEVCLASS_INFRARED,
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sizeof(Filter.dbcc_classguid));
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if ( !RegisterDeviceNotification(ghSplHandle,
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&Filter,
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DEVICE_NOTIFY_SERVICE_HANDLE) ) {
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DBGMSG(DBG_INFO,
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("RegisterForPnPEvents: RegisterDeviceNotification failed for IRDA. Error %d\n",
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GetLastError()));
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} else {
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DBGMSG(DBG_WARNING,
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("RegisterForPnPEvents: RegisterDeviceNotification succesful for IRDA\n"));
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}
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}
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BOOL
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SplUnregisterForDeviceEvents(
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HANDLE hNotify
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)
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{
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PDEVICE_REGISTER_INFO pDevRegnInfo, pPrev;
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EnterRouterSem();
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//
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// Find the registration in our list, remove it and then leave CS to
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// call unregister on it
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//
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for ( pDevRegnInfo = gpDevRegnInfo, pPrev = NULL ;
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pDevRegnInfo ;
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pPrev = pDevRegnInfo, pDevRegnInfo = pDevRegnInfo->pNext ) {
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if ( pDevRegnInfo->hNotify == hNotify ) {
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if ( pPrev )
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pPrev->pNext = pDevRegnInfo->pNext;
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else
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gpDevRegnInfo = pDevRegnInfo->pNext;
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break;
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}
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}
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LeaveRouterSem();
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if ( pDevRegnInfo ) {
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UnregisterDeviceNotification(pDevRegnInfo->hNotify);
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FreeSplMem(pDevRegnInfo);
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return TRUE;
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}
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return FALSE;
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}
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HANDLE
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SplRegisterForDeviceEvents(
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HANDLE hDevice,
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LPVOID pData,
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PFN_QUERYREMOVE_CALLBACK pfnQueryRemove
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)
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{
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DEV_BROADCAST_HANDLE Filter;
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PDEVICE_REGISTER_INFO pDevRegnInfo;
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ZeroMemory(&Filter, sizeof(Filter));
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Filter.dbch_size = sizeof(Filter);
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Filter.dbch_devicetype = DBT_DEVTYP_HANDLE;
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Filter.dbch_handle = hDevice;
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pDevRegnInfo = (PDEVICE_REGISTER_INFO)
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AllocSplMem(sizeof(DEVICE_REGISTER_INFO));
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if ( !pDevRegnInfo )
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goto Fail;
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pDevRegnInfo->hDevice = hDevice;
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pDevRegnInfo->pData = pData;
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pDevRegnInfo->pfnQueryRemove = pfnQueryRemove;
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pDevRegnInfo->hNotify = RegisterDeviceNotification(
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ghSplHandle,
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&Filter,
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DEVICE_NOTIFY_SERVICE_HANDLE);
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if ( pDevRegnInfo->hNotify ) {
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EnterRouterSem();
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pDevRegnInfo->pNext = gpDevRegnInfo;
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gpDevRegnInfo = pDevRegnInfo;
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LeaveRouterSem();
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return pDevRegnInfo->hNotify;
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}
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FreeSplMem(pDevRegnInfo);
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Fail:
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return NULL;
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}
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