Fix CPU Usage Bug

[iperf] / src / main.cpp

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 * ________________________________________________________________
 * National Laboratory for Applied Network Research 
 * National Center for Supercomputing Applications 
 * University of Illinois at Urbana-Champaign 
 * http://www.ncsa.uiuc.edu
 * ________________________________________________________________ 
 * main.cpp
 * by Mark Gates <mgates@nlanr.net>
 * &  Ajay Tirumala <tirumala@ncsa.uiuc.edu>
 * -------------------------------------------------------------------
 * main does initialization and creates the various objects that will
 * actually run the iperf program, then waits in the Joinall().
 * -------------------------------------------------------------------
 * headers
 * uses
 *   <stdlib.h>
 *   <string.h>
 *
 *   <signal.h>
 * ------------------------------------------------------------------- */

#define HEADERS()

#include "headers.h"

#include "Settings.hpp"
#include "PerfSocket.hpp"
#include "Locale.h"
#include "Condition.h"
#include "Timestamp.hpp"
#include "Listener.hpp"
#include "List.h"
#include "util.h"

#ifdef WIN32
#include "service.h"
#endif 

/* -------------------------------------------------------------------
 * prototypes
 * ------------------------------------------------------------------- */
// Function called at exit to clean up as much as possible
void cleanup( void );

/* -------------------------------------------------------------------
 * global variables
 * ------------------------------------------------------------------- */
extern "C" {
    // Global flag to signal a user interrupt
    int sInterupted = 0;
    // Global ID that we increment to be used 
    // as identifier for SUM reports
    int groupID = 0;
    // Mutex to protect access to the above ID
    Mutex groupCond;
    // Condition used to signify advances of the current
    // records being accessed in a report and also to
    // serialize modification of the report list
    Condition ReportCond;
    Condition ReportDoneCond;
}

// global variables only accessed within this file

// Thread that received the SIGTERM or SIGINT signal
// Used to ensure that if multiple threads receive the
// signal we do not prematurely exit
nthread_t sThread;
// The main thread uses this function to wait 
// for all other threads to complete
void waitUntilQuit( void );

/* -------------------------------------------------------------------
 * main()
 *      Entry point into Iperf
 *
 * sets up signal handlers
 * initialize global locks and conditions
 * parses settings from environment and command line
 * starts up server or client thread
 * waits for all threads to complete
 * ------------------------------------------------------------------- */
int main( int argc, char **argv ) {

    // Set SIGTERM and SIGINT to call our user interrupt function
    my_signal( SIGTERM, Sig_Interupt );
    my_signal( SIGINT,  Sig_Interupt );

#ifndef WIN32
    // Ignore broken pipes
    signal(SIGPIPE,SIG_IGN);
#else
    // Start winsock
    WSADATA wsaData;
    int rc = WSAStartup( 0x202, &wsaData );
    WARN_errno( rc == SOCKET_ERROR, "WSAStartup" );
        if (rc == SOCKET_ERROR)
                return 0;

    // Tell windows we want to handle our own signals
    SetConsoleCtrlHandler( sig_dispatcher, true );
#endif

    // Initialize global mutexes and conditions
    Condition_Initialize ( &ReportCond );
    Condition_Initialize ( &ReportDoneCond );
    Mutex_Initialize( &groupCond );
    Mutex_Initialize( &clients_mutex );

    // Initialize the thread subsystem
    thread_init( );

    // Initialize the interrupt handling thread to 0
    sThread = thread_zeroid();

    // perform any cleanup when quitting Iperf
    atexit( cleanup );

    // Allocate the "global" settings
    thread_Settings* ext_gSettings = new thread_Settings;

    // Initialize settings to defaults
    Settings_Initialize( ext_gSettings );
    // read settings from environment variables
    Settings_ParseEnvironment( ext_gSettings );
    // read settings from command-line parameters
    Settings_ParseCommandLine( argc, argv, ext_gSettings );

    // Check for either having specified client or server
    if ( ext_gSettings->mThreadMode == kMode_Client 
         || ext_gSettings->mThreadMode == kMode_Listener ) {
#ifdef WIN32
        // Start the server as a daemon
        // Daemon mode for non-windows in handled
        // in the listener_spawn function
        if ( isDaemon( ext_gSettings ) ) {
            CmdInstallService(argc, argv);
            return 0;
        }

        // Remove the Windows service if requested
        if ( isRemoveService( ext_gSettings ) ) {
            // remove the service
            if ( CmdRemoveService() ) {
                fprintf(stderr, "IPerf Service is removed.\n");

                return 0;
            }
        }
#endif
        // initialize client(s)
        if ( ext_gSettings->mThreadMode == kMode_Client ) {
            client_init( ext_gSettings );
        }

#ifdef HAVE_THREAD
        // start up the reporter and client(s) or listener
        {
            thread_Settings *into = NULL;
            // Create the settings structure for the reporter thread
            Settings_Copy( ext_gSettings, &into );
            into->mThreadMode = kMode_Reporter;

            // Have the reporter launch the client or listener
            into->runNow = ext_gSettings;
            
            // Start all the threads that are ready to go
            thread_start( into );
        }
#else
        // No need to make a reporter thread because we don't have threads
        thread_start( ext_gSettings );
#endif
    } else {
        // neither server nor client mode was specified
        // print usage and exit

#ifdef WIN32
        // In Win32 we also attempt to start a previously defined service
        // Starting in 2.0 to restart a previously defined service
        // you must call iperf with "iperf -D" or using the environment variable
        SERVICE_TABLE_ENTRY dispatchTable[] =
        {
            { TEXT(SZSERVICENAME), (LPSERVICE_MAIN_FUNCTION)service_main},
            { NULL, NULL}
        };

        // Only attempt to start the service if "-D" was specified
        if ( !isDaemon(ext_gSettings) ||
             // starting the service by SCM, there is no arguments will be passed in.
             // the arguments will pass into Service_Main entry.
             !StartServiceCtrlDispatcher(dispatchTable) )
            // If the service failed to start then print usage
#endif
        fprintf( stderr, usage_short, argv[0], argv[0] );

        return 0;
    }

    // wait for other (client, server) threads to complete
    thread_joinall();
    
    // all done!
    return 0;
} // end main

/* -------------------------------------------------------------------
 * Signal handler sets the sInterupted flag, so the object can
 * respond appropriately.. [static]
 * ------------------------------------------------------------------- */

void Sig_Interupt( int inSigno ) {
#ifdef HAVE_THREAD
    // We try to not allow a single interrupt handled by multiple threads
    // to completely kill the app so we save off the first thread ID
    // then that is the only thread that can supply the next interrupt
    if ( thread_equalid( sThread, thread_zeroid() ) ) {
        sThread = thread_getid();
    } else if ( thread_equalid( sThread, thread_getid() ) ) {
        sig_exit( inSigno );
    }

    // global variable used by threads to see if they were interrupted
    sInterupted = 1;

    // with threads, stop waiting for non-terminating threads
    // (ie Listener Thread)
    thread_release_nonterm( 1 );

#else
    // without threads, just exit quietly, same as sig_exit()
    sig_exit( inSigno );
#endif
}

/* -------------------------------------------------------------------
 * Any necesary cleanup before Iperf quits. Called at program exit,
 * either by exit() or terminating main().
 * ------------------------------------------------------------------- */

void cleanup( void ) {
#ifdef WIN32
    // Shutdown Winsock
    WSACleanup();
#endif
    // clean up the list of clients
    Iperf_destroy ( &clients );

    // shutdown the thread subsystem
    thread_destroy( );
} // end cleanup

#ifdef WIN32
/*--------------------------------------------------------------------
 * ServiceStart
 *
 * each time starting the service, this is the entry point of the service.
 * Start the service, certainly it is on server-mode
 * 
 *-------------------------------------------------------------------- */
VOID ServiceStart (DWORD dwArgc, LPTSTR *lpszArgv) {
    
    // report the status to the service control manager.
    //
    if ( !ReportStatusToSCMgr(
                             SERVICE_START_PENDING, // service state
                             NO_ERROR,              // exit code
                             3000) )                 // wait hint
        goto clean;

    thread_Settings* ext_gSettings = new thread_Settings;

    // Initialize settings to defaults
    Settings_Initialize( ext_gSettings );
    // read settings from environment variables
    Settings_ParseEnvironment( ext_gSettings );
    // read settings from command-line parameters
    Settings_ParseCommandLine( dwArgc, lpszArgv, ext_gSettings );

    // report the status to the service control manager.
    //
    if ( !ReportStatusToSCMgr(
                             SERVICE_START_PENDING, // service state
                             NO_ERROR,              // exit code
                             3000) )                 // wait hint
        goto clean;

    // if needed, redirect the output into a specified file
    if ( !isSTDOUT( ext_gSettings ) ) {
        redirect( ext_gSettings->mOutputFileName );
    }

    // report the status to the service control manager.
    //
    if ( !ReportStatusToSCMgr(
                             SERVICE_START_PENDING, // service state
                             NO_ERROR,              // exit code
                             3000) )                 // wait hint
        goto clean;
    
    // initialize client(s)
    if ( ext_gSettings->mThreadMode == kMode_Client ) {
        client_init( ext_gSettings );
    }

    // start up the reporter and client(s) or listener
    {
        thread_Settings *into = NULL;
#ifdef HAVE_THREAD
        Settings_Copy( ext_gSettings, &into );
        into->mThreadMode = kMode_Reporter;
        into->runNow = ext_gSettings;
#else
        into = ext_gSettings;
#endif
        thread_start( into );
    }
    
    // report the status to the service control manager.
    //
    if ( !ReportStatusToSCMgr(
                             SERVICE_RUNNING,       // service state
                             NO_ERROR,              // exit code
                             0) )                    // wait hint
        goto clean;

    clean:
    // wait for other (client, server) threads to complete
    thread_joinall();
}


//
//  FUNCTION: ServiceStop
//
//  PURPOSE: Stops the service
//
//  PARAMETERS:
//    none
//
//  RETURN VALUE:
//    none
//
//  COMMENTS:
//    If a ServiceStop procedure is going to
//    take longer than 3 seconds to execute,
//    it should spawn a thread to execute the
//    stop code, and return.  Otherwise, the
//    ServiceControlManager will believe that
//    the service has stopped responding.
//    
VOID ServiceStop() {
#ifdef HAVE_THREAD
    Sig_Interupt( 1 );
#else
    sig_exit(1);
#endif
}

#endif