Leaked source code of windows server 2003
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//****************************************************************************
//
// File: sempahor.h
//
// Content: This is the include file that contains the semaphore names
// used by the various ICW components to ensure that only
// one component is running at a time
// (with the following expections:
// -- with icwconn1 running, isignup and icwconn2 can execute.
// -- with isignup running, icwconn2 can execute.
//
// History:
// 12/3/96 jmazner Created for Normandy bugs 12140, 12088
//
//
// Copyright (c) Microsoft Corporation 1996
//
//****************************************************************************
#define ICWCONN1_SEMAPHORE TEXT("Internet Connection Wizard ICWCONN1.EXE")
#define ICW_ELSE_SEMAPHORE TEXT("Internet Connection Wizard Non ICWCONN1 Component")
#define DIALOG_CLASS_NAME TEXT("#32770")
BOOL IsAnotherComponentRunning32(BOOL bCreatedSemaphore);
/******
Allow this component to execute? /------------------------------------------------------------\ | ICWCONN1 | ISIGNUP | ISIGN.INS | ICWCONN2 | INETWIZ / --------|------------------------------------------------------------- | | | | | | | ICWCONN1| no | _YES_ | _YES_ | _YES_ | no | | | | | | | --------|-----------|-----------|-----------|-----------|--------------if this | | | | | |component | ISIGNUP | no | no | _YES_ | _YES_ | no is running | | | | | | | --------|-----------|-----------|-----------|-----------|-------------- | | | | | | | ISIGNUP | no | no | _YES_ | _YES_ | no | .INS | | | | | | --------|-----------|-----------|-----------|-----------|-------------- | | | | | | | ICWCONN2| no | no | _YES_ | _YES_ | no | | | | | | | --------|-----------|-----------|-----------|-----------|-------------- | | | | | | | INETWIZ | no | no | _YES_ | _YES_ | no | | | | | | \ --------|-----------|-----------|-----------|-----------|--------------
Implement this using two semaphores, one for ICWCONN1, and one for everything else (ICW_ELSE)On startup, each component set its semaphore, then checks what other components are running.
Conn1: check for ICWCONN1, ICW_ELSEIsignup: check for ICW_ELSEIsignup .ins: no checksICWCONN2: no checksInetwiz: Check for ICWCONN1, ICW_ELSE
******/
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