widget/src/photon/nsToolkit.cpp
author Ted Mielczarek <ted.mielczarek@gmail.com>
Thu, 30 Oct 2008 13:02:14 -0400
changeset 21102 80406c10f79550033c169b537db21669d3aef401
parent 1 9b2a99adc05e53cd4010de512f50118594756650
permissions -rw-r--r--
bug 461395 - add support for PARALLEL_DIRS to build system, parallelize content. r=bsmedberg

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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#include "nsToolkit.h"
#include "nscore.h"
#include "nsWidgetAtoms.h"

//
// Static thread local storage index of the Toolkit 
// object associated with a given thread...
//
static PRUintn gToolkitTLSIndex = 0;

NS_IMPL_ISUPPORTS1(nsToolkit,nsIToolkit)

//-------------------------------------------------------------------------
//
// constructor
//
//-------------------------------------------------------------------------
nsToolkit::nsToolkit()  
{
}


//-------------------------------------------------------------------------
//
// destructor
//
//-------------------------------------------------------------------------
nsToolkit::~nsToolkit()
{
  // Remove the TLS reference to the toolkit...
  PR_SetThreadPrivate(gToolkitTLSIndex, nsnull);
}


//-------------------------------------------------------------------------
//
//
//-------------------------------------------------------------------------
NS_METHOD nsToolkit::Init(PRThread *aThread)
{
  nsWidgetAtoms::RegisterAtoms();

  return NS_OK;
}

//-------------------------------------------------------------------------
//
// Return the nsIToolkit for the current thread.  If a toolkit does not
// yet exist, then one will be created...
//
//-------------------------------------------------------------------------
NS_METHOD NS_GetCurrentToolkit(nsIToolkit* *aResult)
{
  nsIToolkit* toolkit = nsnull;
  nsresult rv = NS_OK;
  PRStatus status;

  // Create the TLS index the first time through...
  if (0 == gToolkitTLSIndex) {
    status = PR_NewThreadPrivateIndex(&gToolkitTLSIndex, NULL);
    if (PR_FAILURE == status) {
      rv = NS_ERROR_FAILURE;
    }
  }

  if (NS_SUCCEEDED(rv)) {
    toolkit = (nsIToolkit*)PR_GetThreadPrivate(gToolkitTLSIndex);

    //
    // Create a new toolkit for this thread...
    //
    if (!toolkit) {
      toolkit = new nsToolkit();

      if (!toolkit) {
        rv = NS_ERROR_OUT_OF_MEMORY;
      } else {
        NS_ADDREF(toolkit);
        toolkit->Init(PR_GetCurrentThread());
        //
        // The reference stored in the TLS is weak.  It is removed in the
        // nsToolkit destructor...
        //
        PR_SetThreadPrivate(gToolkitTLSIndex, (void*)toolkit);
      }
    } else {
      NS_ADDREF(toolkit);
    }
    *aResult = toolkit;
  }

  return rv;
}