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/*                                                                            */
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/* Copyright (c) 2005-2020 Rexx Language Association. All rights reserved.    */
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/*****************************************************************************/
/* REXX Windows Support                                                      */
/*                                                                           */
/* Semaphore support for Windows                                             */
/*                                                                           */
/*****************************************************************************/

#include "SysSemaphore.hpp"

bool SysSemaphore::usingTls = false;
DWORD SysSemaphore::tlsNoMessageLoopIndex = TLS_OUT_OF_INDEXES;

/**
 * Create a semaphore with potential creation-time
 * initialization.
 *
 * @param create Indicates whether the semaphore should be created now.
 */
SysSemaphore::SysSemaphore(bool createSem)
{
    sem = 0;
    if (createSem)
    {
        create();
    }
}


/* ********************************************************************** */
/* ***                  SysSemaphore                                  *** */
/* ********************************************************************** */
void SysSemaphore::create()
{
   if (sem == 0)
   {
       // create a semaphore in manual-reset mode, and non-signaled state
       sem = CreateEvent(NULL, true, false, NULL);
   }
}

void SysSemaphore::close()
{
    if (sem != 0)
    {
        CloseHandle(sem);
        sem = 0;
    }
}


/* ********************************************************************** */
/* ***                  SysMutex                                     *** */
/* ********************************************************************** */

/**
 * Create a semaphore with potential creation-time
 * initialization.
 *
 * @param createSem
 * @param critical  Critical indicates the most efficient dispatching mechanism should be use.
 */
SysMutex::SysMutex(bool createSem, bool critical)
{
    mutexMutex = 0;
    bypassMessageLoop = critical;
    if (createSem)
    {
        create();
    }
}


/**
 * Create a mutex for operation
 *
 * @param critical Indicates whether this is a "critical time" semaphore that will only be
 *                 held for short windows. The most optimal (i.e., no message loop on Windows)
 *                 mechanism will be used for requesting the semaphore.
 */
void SysMutex::create(bool critical)
{
    bypassMessageLoop = critical;
    if (mutexMutex == 0)
    {
        mutexMutex = CreateMutex(NULL, false, NULL);
    }
}

void SysMutex::close()
{
    if (mutexMutex != 0)
    {
        CloseHandle(mutexMutex);
        mutexMutex = 0;
    }
}