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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)
// 	      : Yi Zhou, Hewlett-Packard Company (yi_zhou@hp.com)
//
//%/////////////////////////////////////////////////////////////////////////////

#ifndef Pegasus_Signal_h
#define Pegasus_Signal_h

#include <Pegasus/Common/Linkage.h>
#include <Pegasus/Common/Mutex.h>

// // Ensure Unix 98
// #ifdef PEGASUS_PLATFORM_LINUX_IX86_GNU
//    #ifndef _GNU_SOURCE
//       #define _GNU_SOURCE
//    #endif
// #else
//    #ifdef _XOPEN_SOURCE
//       #undef _XOPEN_SOURCE
//    #endif
//    #define _XOPEN_SOURCE 600
// #endif

#ifdef PEGASUS_HAS_SIGNALS

# include <signal.h>
typedef siginfo_t PEGASUS_SIGINFO_T;
# define PEGASUS_SIGHUP   SIGHUP
# define PEGASUS_SIGABRT  SIGABRT
# define PEGASUS_SIGPIPE  SIGPIPE
# define PEGASUS_SIGTERM  SIGTERM
# define PEGASUS_SIGUSR1  SIGUSR1
# define PEGASUS_SIGCHLD  SIGCHLD

#else // PEGASUS_HAS_SIGNALS

typedef void PEGASUS_SIGINFO_T;
# define PEGASUS_SIGHUP   1
# define PEGASUS_SIGABRT  11
# define PEGASUS_SIGPIPE  13
# define PEGASUS_SIGTERM  15
# define PEGASUS_SIGUSR1  16
# define PEGASUS_SIGCHLD  18

#endif // PEGASUS_HAS_SIGNALS


#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM) || (PEGASUS_OS_SOLARIS)
extern "C" {
#endif

typedef void (* signal_handler)(int, PEGASUS_SIGINFO_T *, void *);

#if defined(PEGASUS_PLATFORM_ZOS_ZSERIES_IBM) || (PEGASUS_OS_SOLARIS)
}
#endif

// Sample signal handler for SIGABRT that stops the failing thread normally
void sig_act(int s_n, PEGASUS_SIGINFO_T * s_info, void * sig);

PEGASUS_NAMESPACE_BEGIN

class PEGASUS_COMMON_LINKAGE SignalHandler
{
public:
    SignalHandler();

    ~SignalHandler(); // deactivate all registered handlers

    // these functions should throw exceptions

    void registerHandler(unsigned signum, signal_handler _sighandler);

    void activate(unsigned signum);

    //void activateAll();

    void deactivate(unsigned signum);

    void deactivateAll();

    static void ignore(unsigned signum);

private:

#ifdef PEGASUS_HAS_SIGNALS
    enum
    {
        PEGASUS_NSIG = 32
    };

    static void verifySignum(unsigned signum);

    typedef struct {
        int signum;
        int active;
        signal_handler sh;
        struct sigaction oldsa;
    } register_handler;

    register_handler reg_handler[PEGASUS_NSIG + 1];
    Mutex reg_mutex;

    void deactivate_i(register_handler &rh);

    register_handler &getHandler(unsigned sigum);
#endif

};

PEGASUS_COMMON_LINKAGE SignalHandler * getSigHandle();

PEGASUS_NAMESPACE_END

#endif // Pegasus_Signal_h