//%2005////////////////////////////////////////////////////////////////////////
//
// 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.
//
// 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 (sedgewick_de@yahoo.de)
//
// Modified By: Sean Keenan (sean.keenan@hp.com)
//
//%/////////////////////////////////////////////////////////////////////////////

#ifndef IPC_VMS_include
#define IPC_VMS_include

#include <pthread.h>
#include <signal.h>
#include <errno.h>
#include <sys/time.h>
#include <time.h>

PEGASUS_NAMESPACE_BEGIN

int timeval_subtract (struct timeval *result, 
		      struct timeval *x, 
		      struct timeval *y);


typedef pthread_t PEGASUS_THREAD_TYPE;
typedef pthread_mutex_t PEGASUS_MUTEX_TYPE;

typedef struct {
    Uint32 waiters;
    pthread_mutex_t mutex;
    pthread_cond_t cond;
    pthread_t owner;
} PEGASUS_SEM_HANDLE ;

typedef struct {
    pthread_mutex_t mut;
    pthread_mutexattr_t mutatt;
    pthread_t owner;
} PEGASUS_MUTEX_HANDLE ;

typedef void *PEGASUS_CLEANUP_HANDLE;
typedef void *PEGASUS_THREAD_RETURN;

#define PEGASUS_THREAD_CDECL

typedef struct {
    pthread_t thid;
    pthread_attr_t thatt;
} PEGASUS_THREAD_HANDLE ;

//-----------------------------------------------------------------
/// Conditionals to support native or generic Conditional Semaphore
//-----------------------------------------------------------------

#define PEGASUS_CONDITIONAL_NATIVE = 1

typedef pthread_cond_t PEGASUS_COND_TYPE;

typedef struct {
    pthread_cond_t cond;
    pthread_t owner;
} PEGASUS_COND_HANDLE;


//-----------------------------------------------------------------
/// Conditionals to support native or generic read/write semaphores
//-----------------------------------------------------------------


//-----------------------------------------------------------------
// NOTE: Tue Oct  9 13:36:53 2001 mdday
//
//  I put some read/write counting into the Thread test program to see
//  how native r/w performance compares to generic r/w on linux. 
//  For RH linux 7.1, the generic r/w lock in IPC.cpp performs 
//  much better than the pthreads native implementation.
//  
//  Here are the data (remember that there are 4 readers for every one
//  writer):
// 
//  Generic  read operations  6538     <- 4:1 ratio of reads to writes
//           write operations 1422
//
//  Native   read operations   2060    <- 1:1 even though there are 
//           write operations  2033       4 readers for every writer
//
//
//  Comments -
// 
// The native implementation prefers writers, which slows the entire
// test down because write operations take longer than read operations.
// Moreover, as soon as one writer gains the lock, the next owner will 
// always be a writer until there are no further writers. Readers are 
// blocked out until all writers are sleeping. 
//
// In the test there are 4 readers for every writer. However, the 
// native r/w lock severely skews resources toward writers.
// 
// The generic implementation has no preference among readers and writers. 
// Therefore whichever thread is ready to read or write will gain the lock
// with no dependence on whether the predecessor is a reader or writer. 
// This results in higher throughput in the test program for linux.
//
// I would encourage all the platform maintainers to run their own tests
// so we can decide which implementation to use for production builds. 
//
//-----------------------------------------------------------------


inline void pegasus_yield(void)
{
      sched_yield();
}

// pthreads cancellation calls 
inline void disable_cancel(void)
{
   pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
}

inline void enable_cancel(void)
{
   pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
}

inline void pegasus_sleep(int msec)
{
   sleep(msec/1000);
}

inline static int pegasus_gettimeofday(struct timeval *tv)
{
   return(gettimeofday(tv, NULL));
}
   
inline void exit_thread(PEGASUS_THREAD_RETURN rc)
{
  pthread_exit(rc);
}

inline PEGASUS_THREAD_TYPE pegasus_thread_self(void) 
{ 
   return(pthread_self());
}

// l10n start
typedef pthread_key_t PEGASUS_THREAD_KEY_TYPE;

inline Uint32 pegasus_key_create(PEGASUS_THREAD_KEY_TYPE * key)
{
	// Note: a destructor is not supported 
	// (because not supported on Windows (?))
	return pthread_key_create(key, NULL);
} 

inline Uint32 pegasus_key_delete(PEGASUS_THREAD_KEY_TYPE key)
{
	return pthread_key_delete(key);
} 

inline void * pegasus_get_thread_specific(PEGASUS_THREAD_KEY_TYPE key)
{
	return pthread_getspecific(key);
} 

inline Uint32 pegasus_set_thread_specific(PEGASUS_THREAD_KEY_TYPE key,
					  void * value)
{
	return pthread_setspecific(key, value);
} 
// l10n end


inline void destroy_thread(PEGASUS_THREAD_TYPE th, PEGASUS_THREAD_RETURN rc)
{
   pthread_cancel(th);
}

PEGASUS_NAMESPACE_END

#endif // IPCVMS_Include