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BUG#: 5314
TITLE: IPC Refactoring

DESCRIPTION: This patch cleans up the IPC related classes. It (1) reorganizes
related classes into their own headers, (2) makes the mutex class recursive to
eliminate recursive lock exclusion logic, (3) reimplements condition variables,
renames dozens of global functions.

//%2006////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2000, 2001, 2002 BMC Software; Hewlett-Packard Development
// Company, L.P.; IBM Corp.; The Open Group; Tivoli Systems.
// Copyright (c) 2003 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation, The Open Group.
// Copyright (c) 2004 BMC Software; Hewlett-Packard Development Company, L.P.;
// IBM Corp.; EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2005 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; VERITAS Software Corporation; The Open Group.
// Copyright (c) 2006 Hewlett-Packard Development Company, L.P.; IBM Corp.;
// EMC Corporation; Symantec Corporation; The Open Group.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// 
// THE ABOVE COPYRIGHT NOTICE AND THIS PERMISSION NOTICE SHALL BE INCLUDED IN
// ALL COPIES OR SUBSTANTIAL PORTIONS OF THE SOFTWARE. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//==============================================================================
//
// Author: Markus Mueller (markus_mueller@de.ibm.com)
//
// Modified By: Roger Kumpf, Hewlett-Packard Company (roger_kumpf@hp.com)
//              Amit K Arora, IBM (amita@in.ibm.com) for Bug#1090
//              David Dillard, VERITAS Software Corp (david.dillard@veritas.com)
//
//%/////////////////////////////////////////////////////////////////////////////

#include <cstdio>
#include <cstring>
#ifdef PEGASUS_PLATFORM_SOLARIS_SPARC_CC
#include <iostream.h>
#endif

#include <Pegasus/Common/Config.h>
#include <Pegasus/Common/Signal.h>
#include <Pegasus/Common/Exception.h>

PEGASUS_USING_PEGASUS;

void sig_act(int s_n, PEGASUS_SIGINFO_T * s_info, void * sig)
{
    ThreadReturnType retval = 0;

    if (s_n == PEGASUS_SIGABRT)
    {
        printf("Received an abort signal\n");
#if defined(PEGASUS_HAS_SIGNALS) && !defined(PEGASUS_OS_OS400)
        printf(" in address %p\n", s_info->si_addr);
#endif

        // In general it is dangerous to call pthread from within a
        // signal handler, because they are not signal safe
        Threads::exit(retval);
    }
}


PEGASUS_NAMESPACE_BEGIN

#ifdef PEGASUS_HAS_SIGNALS

SignalHandler::SignalHandler()
{
    for(unsigned i=0;i <= PEGASUS_NSIG;i++)
    {
       register_handler &rh = reg_handler[i];
       rh.signum = i;
       rh.active = 0;
       rh.sh = NULL;
       memset(&rh.oldsa,0,sizeof(struct sigaction));
    }
}

SignalHandler::~SignalHandler()
{
    deactivateAll();
}

void SignalHandler::verifySignum(unsigned signum)
{
    if ( signum > PEGASUS_NSIG )
    {
        throw IndexOutOfBoundsException();
    }
}

SignalHandler::register_handler& 
SignalHandler::getHandler(unsigned signum)
{
    verifySignum(signum);
    return(reg_handler[signum]);
}

void SignalHandler::registerHandler(unsigned signum, signal_handler _sighandler)
{
    register_handler &rh = getHandler(signum);
    AutoMutex autoMut(reg_mutex);
    deactivate_i(rh);
    rh.sh = _sighandler;
}

void SignalHandler::activate(unsigned signum)
{
    register_handler &rh = getHandler(signum);
    AutoMutex autoMut(reg_mutex);
    if (rh.active)
    {
        return; // throw exception
    }

    struct sigaction sig_acts;

    sig_acts.sa_sigaction = rh.sh;
    sigfillset(&(sig_acts.sa_mask));
    sig_acts.sa_flags = SA_SIGINFO;

    sigaction(signum, &sig_acts, &rh.oldsa);

    rh.active = -1;
}

void SignalHandler::deactivate(unsigned signum)
{
    register_handler &rh = getHandler(signum);
    AutoMutex autoMut(reg_mutex);
    deactivate_i(rh);
}

void SignalHandler::deactivate_i(register_handler &rh)
{
    if (rh.active)
    {
        rh.active = 0;
        sigaction(rh.signum, &rh.oldsa, NULL);
    }
}

void SignalHandler::deactivateAll()
{
    AutoMutex autoMut(reg_mutex);
    for (unsigned i=0; i <= PEGASUS_NSIG; i++)
    {
        register_handler &rh = reg_handler[i];
        if (rh.active)
        {
            deactivate_i(rh);
        }
    }
}

void SignalHandler::ignore(unsigned signum)
{

    verifySignum(signum);

#if !defined(PEGASUS_PLATFORM_OS400_ISERIES_IBM) && !defined(PEGASUS_PLATFORM_DARWIN_PPC_GNU)
    sigignore(signum);
#else
    struct sigaction sig_acts;

    sig_acts.sa_handler = SIG_IGN;
    sigfillset(&(sig_acts.sa_mask));
    sig_acts.sa_flags = 0;

    sigaction(signum, &sig_acts, NULL);
#endif
}

#else // PEGASUS_HAS_SIGNALS

SignalHandler::SignalHandler() { }

SignalHandler::~SignalHandler() { }

void SignalHandler::registerHandler(unsigned signum, signal_handler _sighandler)
{ }

void SignalHandler::activate(unsigned signum) { }

void SignalHandler::deactivate(unsigned signum) { }

void SignalHandler::deactivateAll() { }

void SignalHandler::ignore(unsigned signum) { }

#endif // PEGASUS_HAS_SIGNALS


// export the global signal handling object

SignalHandler _globalSignalHandler;
SignalHandler * _globalSignalHandlerPtr = &_globalSignalHandler;
SignalHandler * getSigHandle() { return _globalSignalHandlerPtr; }


PEGASUS_NAMESPACE_END