/*++ Copyright (c) 1996 Microsoft Corporation This program is released into the public domain for any purpose. Module Name: worker.c Abstract: This module is a simple work item for the Multi-Threaded ISAPI example Revision History: --*/ #include #include #include "worker.h" #include #include // // Constants // // // The set of response headers we want to include with the servers. Note // this includes the header terminator // #define RESPONSE_HEADERS "Content-Type: text/html\r\n\r\n" // // Globals // // // This global variable maintains the current state about the // the lottery number generated. // // The lottery number is generated using a combination // of the sequence number and a random number generated on the fly. // DWORD g_dwLotteryNumberSequence = 0; // // Critical section to protect the global counter. // CRITICAL_SECTION g_csGlobal; // // Prototypes // VOID GenerateLotteryNumber( LPDWORD pLotNum1, LPDWORD pLotNum2 ); // // Functions // BOOL InitializeLottery( VOID ) /*++ Routine Description: Sets up the initial state for the lottery number generator Returns: TRUE on success, FALSE on failure --*/ { time_t pTime; // // Seed the random number generator // srand(time(&pTime)); g_dwLotteryNumberSequence = rand(); InitializeCriticalSection( &g_csGlobal ); return TRUE; } BOOL SendLotteryNumber( EXTENSION_CONTROL_BLOCK * pecb ) /*++ Routine Description: This function sends a randomly generated lottery number back to the client Arguments: pecb - pointer to EXTENSION_CONTROL_BLOCK for this request Returns: TRUE on success, FALSE on failure --*/ { BOOL fRet; char rgBuff[2048]; // // Send the response headers and status code // fRet = pecb->ServerSupportFunction( pecb->ConnID, /* ConnID */ HSE_REQ_SEND_RESPONSE_HEADER, /* dwHSERRequest */ "200 OK", /* lpvBuffer */ NULL, /* lpdwSize. NULL=> send string */ (LPDWORD ) RESPONSE_HEADERS); /* header contents */ if ( fRet ) { CHAR rgchLuckyNumber[40]; DWORD dwLotNum1, dwLotNum2; DWORD cb; CHAR rgchClientHost[200] = "LT"; DWORD cbClientHost = 200; if ( !pecb->GetServerVariable(pecb->ConnID, "REMOTE_HOST", rgchClientHost, &cbClientHost)) { // No host name is available. // Make up one strcpy(rgchClientHost, "RH"); } else { // terminate with just two characters rgchClientHost[2] = '\0'; } // // Generate a lottery number, generate the contents of body and // send the body to client. // GenerateLotteryNumber( &dwLotNum1, &dwLotNum2); // Lottery Number format is: Number-2letters-Number. wsprintf( rgchLuckyNumber, "%03d-%s-%05d", dwLotNum1, rgchClientHost, dwLotNum2); // // Body of the message sent back. // cb = wsprintf( rgBuff, "Lucky Number\n" "

Lucky Corner

" "

Your lottery number is: " " %s

\n" "

", rgchLuckyNumber); fRet = pecb->WriteClient (pecb->ConnID, /* ConnID */ (LPVOID ) rgBuff, /* message */ &cb, /* lpdwBytes */ 0 ); /* reserved */ } return ( fRet ? HSE_STATUS_SUCCESS : HSE_STATUS_ERROR); } /* SendLotteryNumber */ VOID TerminateLottery( VOID ) { DeleteCriticalSection( &g_csGlobal ); } VOID GenerateLotteryNumber( LPDWORD pLotNum1, LPDWORD pLotNum2 ) { DWORD dwLotteryNum; DWORD dwModulo; // // Obtain the current lottery number an increment the counter // To keep this multi-thread safe use critical section around it // EnterCriticalSection( &g_csGlobal); dwLotteryNum = g_dwLotteryNumberSequence++; LeaveCriticalSection( &g_csGlobal); // obtain a non-zero modulo value do { dwModulo = rand(); } while ( dwModulo == 0); // split the lottery number into two parts. *pLotNum1 = (dwLotteryNum / dwModulo); *pLotNum2 = (dwLotteryNum % dwModulo); return; } // GenerateLotteryNumber()