1 files changed, 450 insertions, 0 deletions
diff --git a/src/libs/xpcom18a4/xpcom/threads/nsEventQueueService.cpp b/src/libs/xpcom18a4/xpcom/threads/nsEventQueueService.cpp
new file mode 100644
index 00000000..4fbb65aa
--- /dev/null
+++ b/src/libs/xpcom18a4/xpcom/threads/nsEventQueueService.cpp
@@ -0,0 +1,450 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla Communicator client code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Rick Potts <rpotts@netscape.com>
+ *   Ramiro Estrugo <ramiro@netscape.com>
+ *   Warren Harris <warren@netscape.com>
+ *   Leaf Nunes <leaf@mozilla.org>
+ *   David Matiskella <davidm@netscape.com>
+ *   David Hyatt <hyatt@netscape.com>
+ *   Seth Spitzer <sspitzer@netscape.com>
+ *   Suresh Duddi <dp@netscape.com>
+ *   Bruce Mitchener <bruce@cybersight.com>
+ *   Scott Collins <scc@netscape.com>
+ *   Daniel Matejka <danm@netscape.com>
+ *   Doug Turner <dougt@netscape.com>
+ *   Stuart Parmenter <pavlov@netscape.com>
+ *   Mike Kaply <mkaply@us.ibm.com>
+ *   Dan Mosedale <dmose@mozilla.org>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of the GNU General Public License Version 2 or later (the "GPL"),
+ * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsEventQueueService.h"
+#include "prmon.h"
+#include "nsIComponentManager.h"
+#include "nsIThread.h"
+#include "nsPIEventQueueChain.h"
+
+#include "prlog.h"
+
+#if defined(PR_LOGGING) || defined(DEBUG_danm)
+extern PRLogModuleInfo* gEventQueueLog;
+extern PRUint32 gEventQueueLogCount;
+#endif
+
+static NS_DEFINE_CID(kEventQueueCID, NS_EVENTQUEUE_CID);
+
+nsEventQueueServiceImpl::nsEventQueueServiceImpl()
+{
+  mEventQMonitor = PR_NewMonitor();
+#if defined(PR_LOGGING) && defined(DEBUG_danm)
+  if (!gEventQueueLog)
+    gEventQueueLog = PR_NewLogModule("nseventqueue");
+#endif
+}
+
+PR_STATIC_CALLBACK(PLDHashOperator)
+hash_enum_remove_queues(const void *aThread_ptr,
+                        nsCOMPtr<nsIEventQueue>& aEldestQueue,
+                        void* closure)
+{
+  // 'aQueue' should be the eldest queue.
+  nsCOMPtr<nsPIEventQueueChain> pie(do_QueryInterface(aEldestQueue));
+  nsCOMPtr<nsIEventQueue> q;
+
+  // stop accepting events for youngest to oldest
+  pie->GetYoungest(getter_AddRefs(q));
+  while (q) {
+    q->StopAcceptingEvents();
+
+    nsCOMPtr<nsPIEventQueueChain> pq(do_QueryInterface(q));
+    pq->GetElder(getter_AddRefs(q));
+  }
+
+  return PL_DHASH_REMOVE;
+}
+
+nsEventQueueServiceImpl::~nsEventQueueServiceImpl()
+{
+  // XXX make it so we only enum over this once
+  mEventQTable.Enumerate(hash_enum_remove_queues, nsnull); // call StopAcceptingEvents on everything and clear out the hashtable
+
+  PR_DestroyMonitor(mEventQMonitor);
+}
+
+nsresult
+nsEventQueueServiceImpl::Init()
+{
+  NS_ENSURE_TRUE(mEventQMonitor, NS_ERROR_OUT_OF_MEMORY);
+
+  // This will only be called once on the main thread, so it's safe to
+  // not enter the monitor here.
+  if (!mEventQTable.Init()) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  
+  // ensure that a main thread event queue exists!
+  nsresult rv;
+  nsCOMPtr<nsIThread> mainThread;
+  rv = nsIThread::GetMainThread(getter_AddRefs(mainThread));
+  if (NS_SUCCEEDED(rv)) {
+    PRThread *thr;
+    rv = mainThread->GetPRThread(&thr);
+    if (NS_SUCCEEDED(rv))
+      rv = CreateEventQueue(thr, PR_TRUE);
+  }
+  return rv;
+}
+
+/* nsISupports interface implementation... */
+NS_IMPL_THREADSAFE_ISUPPORTS1(nsEventQueueServiceImpl, nsIEventQueueService)
+
+/* nsIEventQueueService interface implementation... */
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::CreateThreadEventQueue()
+{
+  return CreateEventQueue(PR_GetCurrentThread(), PR_TRUE);
+}
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::CreateMonitoredThreadEventQueue()
+{
+  return CreateEventQueue(PR_GetCurrentThread(), PR_FALSE);
+}
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::CreateFromIThread(nsIThread *aThread, PRBool aNative,
+                                           nsIEventQueue **aResult)
+{
+  nsresult rv;
+  PRThread *prThread;
+
+  rv = aThread->GetPRThread(&prThread);
+  if (NS_SUCCEEDED(rv)) {
+    rv = CreateEventQueue(prThread, aNative); // addrefs
+    if (NS_SUCCEEDED(rv))
+      rv = GetThreadEventQueue(prThread, aResult); // addrefs
+  }
+  return rv;
+}
+
+// private method
+NS_IMETHODIMP
+nsEventQueueServiceImpl::MakeNewQueue(PRThread* thread,
+                                      PRBool aNative,
+                                      nsIEventQueue **aQueue)
+{
+  nsresult rv;
+  nsCOMPtr<nsIEventQueue> queue = do_CreateInstance(kEventQueueCID, &rv);
+
+  if (NS_SUCCEEDED(rv)) {
+    rv = queue->InitFromPRThread(thread, aNative);
+  }	
+  *aQueue = queue;
+  NS_IF_ADDREF(*aQueue);
+  return rv;
+}
+
+// private method
+NS_IMETHODIMP
+nsEventQueueServiceImpl::CreateEventQueue(PRThread *aThread, PRBool aNative)
+{
+  nsresult rv = NS_OK;
+  /* Enter the lock that protects the EventQ hashtable... */
+  PR_EnterMonitor(mEventQMonitor);
+
+  /* create only one event queue chain per thread... */
+  if (!mEventQTable.GetWeak(aThread)) {
+    nsCOMPtr<nsIEventQueue> queue;
+
+    // we don't have one in the table
+    rv = MakeNewQueue(aThread, aNative, getter_AddRefs(queue)); // create new queue
+    mEventQTable.Put(aThread, queue); // add to the table (initial addref)
+  }
+
+  // Release the EventQ lock...
+  PR_ExitMonitor(mEventQMonitor);
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::DestroyThreadEventQueue(void)
+{
+  nsresult rv = NS_OK;
+
+  /* Enter the lock that protects the EventQ hashtable... */
+  PR_EnterMonitor(mEventQMonitor);
+
+  PRThread* currentThread = PR_GetCurrentThread();
+  nsIEventQueue* queue = mEventQTable.GetWeak(currentThread);
+  if (queue) {
+    queue->StopAcceptingEvents(); // tell the queue to stop accepting events
+    queue = nsnull; // Queue may die on the next line
+    mEventQTable.Remove(currentThread); // remove nsIEventQueue from hash table (releases)
+  }
+
+  // Release the EventQ lock...
+  PR_ExitMonitor(mEventQMonitor);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::CreateFromPLEventQueue(PLEventQueue* aPLEventQueue, nsIEventQueue** aResult)
+{
+	// Create our thread queue using the component manager
+	nsresult rv;
+	nsCOMPtr<nsIEventQueue> queue = do_CreateInstance(kEventQueueCID, &rv);
+	if (NS_FAILED(rv)) return rv;
+
+  rv = queue->InitFromPLQueue(aPLEventQueue);
+	if (NS_FAILED(rv)) return rv;
+
+	*aResult = queue;
+  NS_IF_ADDREF(*aResult);
+	return NS_OK;
+}
+
+
+// Return the active event queue on our chain
+/* inline */
+nsresult nsEventQueueServiceImpl::GetYoungestEventQueue(nsIEventQueue *queue, nsIEventQueue **aResult)
+{
+  nsCOMPtr<nsIEventQueue> answer;
+
+  if (queue) {
+    nsCOMPtr<nsPIEventQueueChain> ourChain(do_QueryInterface(queue));
+    if (ourChain)
+      ourChain->GetYoungestActive(getter_AddRefs(answer));
+    else
+      answer = queue;
+  }
+
+  *aResult = answer;
+  NS_IF_ADDREF(*aResult);
+  return NS_OK;
+}
+
+
+// create new event queue, append it to the current thread's chain of event queues.
+// return it, addrefed.
+NS_IMETHODIMP
+nsEventQueueServiceImpl::PushThreadEventQueue(nsIEventQueue **aNewQueue)
+{
+  nsresult rv = NS_OK;
+  PRThread* currentThread = PR_GetCurrentThread();
+  PRBool native = PR_TRUE; // native by default as per old comment
+
+
+  NS_ASSERTION(aNewQueue, "PushThreadEventQueue called with null param");
+
+  /* Enter the lock that protects the EventQ hashtable... */
+  PR_EnterMonitor(mEventQMonitor);
+
+  nsIEventQueue* queue = mEventQTable.GetWeak(currentThread);
+  
+  NS_ASSERTION(queue, "pushed event queue on top of nothing");
+
+  if (queue) { // find out what kind of queue our relatives are
+    nsCOMPtr<nsIEventQueue> youngQueue;
+    GetYoungestEventQueue(queue, getter_AddRefs(youngQueue));
+    if (youngQueue) {
+      youngQueue->IsQueueNative(&native);
+    }
+  }
+
+  nsIEventQueue* newQueue = nsnull;
+  MakeNewQueue(currentThread, native, &newQueue); // create new queue; addrefs
+
+  if (!queue) {
+    // shouldn't happen. as a fallback, we guess you wanted a native queue
+    mEventQTable.Put(currentThread, newQueue);
+  }
+
+  // append to the event queue chain
+  nsCOMPtr<nsPIEventQueueChain> ourChain(do_QueryInterface(queue)); // QI the queue in the hash table
+  if (ourChain)
+    ourChain->AppendQueue(newQueue); // append new queue to it
+
+  *aNewQueue = newQueue;
+
+#if defined(PR_LOGGING) && defined(DEBUG_danm)
+  PLEventQueue *equeue;
+  (*aNewQueue)->GetPLEventQueue(&equeue);
+  PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
+         ("EventQueue: Service push queue [queue=%lx]",(long)equeue));
+  ++gEventQueueLogCount;
+#endif
+
+  // Release the EventQ lock...
+  PR_ExitMonitor(mEventQMonitor);
+  return rv;
+}
+
+// disable and release the given queue (though the last one won't be released)
+NS_IMETHODIMP
+nsEventQueueServiceImpl::PopThreadEventQueue(nsIEventQueue *aQueue)
+{
+  PRThread* currentThread = PR_GetCurrentThread();
+
+  /* Enter the lock that protects the EventQ hashtable... */
+  PR_EnterMonitor(mEventQMonitor);
+
+  nsCOMPtr<nsIEventQueue> eldestQueue;
+  mEventQTable.Get(currentThread, getter_AddRefs(eldestQueue));
+
+  // If we are popping the eldest queue, remove its mEventQTable entry.
+  if (aQueue == eldestQueue)
+    mEventQTable.Remove(currentThread);
+
+  // Exit the monitor before processing pending events to avoid deadlock.
+  // Our reference from the eldestQueue nsCOMPtr will keep that object alive.
+  // Since it is thread-private, no one else can race with us here.
+  PR_ExitMonitor(mEventQMonitor);
+  if (!eldestQueue)
+    return NS_ERROR_FAILURE;
+
+#if defined(PR_LOGGING) && defined(DEBUG_danm)
+  PLEventQueue *equeue;
+  aQueue->GetPLEventQueue(&equeue);
+  PR_LOG(gEventQueueLog, PR_LOG_DEBUG,
+         ("EventQueue: Service pop queue [queue=%lx]",(long)equeue));
+  ++gEventQueueLogCount;
+#endif
+  aQueue->StopAcceptingEvents();
+  aQueue->ProcessPendingEvents(); // make sure we don't orphan any events
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::GetThreadEventQueue(PRThread* aThread, nsIEventQueue** aResult)
+{
+  /* Parameter validation... */
+  if (NULL == aResult) return NS_ERROR_NULL_POINTER;
+
+  PRThread* keyThread = aThread;
+
+  if (keyThread == NS_CURRENT_THREAD)
+  {
+     keyThread = PR_GetCurrentThread();
+  }
+  else if (keyThread == NS_UI_THREAD)
+  {
+    nsCOMPtr<nsIThread>  mainIThread;
+
+    // Get the primordial thread
+    nsresult rv = nsIThread::GetMainThread(getter_AddRefs(mainIThread));
+    if (NS_FAILED(rv)) return rv;
+
+    rv = mainIThread->GetPRThread(&keyThread);
+    if (NS_FAILED(rv)) return rv;
+  }
+
+  /* Enter the lock that protects the EventQ hashtable... */
+  PR_EnterMonitor(mEventQMonitor);
+
+  nsCOMPtr<nsIEventQueue> queue;
+  mEventQTable.Get(keyThread, getter_AddRefs(queue));
+
+  PR_ExitMonitor(mEventQMonitor);
+
+  if (queue) {
+    GetYoungestEventQueue(queue, aResult); // get the youngest active queue
+  } else {
+    *aResult = nsnull;
+  }
+  // XXX: Need error code for requesting an event queue when none exists...
+  if (!*aResult) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::ResolveEventQueue(nsIEventQueue* queueOrConstant, nsIEventQueue* *resultQueue)
+{
+  if (queueOrConstant == NS_CURRENT_EVENTQ) {
+    return GetThreadEventQueue(NS_CURRENT_THREAD, resultQueue);
+  }
+  else if (queueOrConstant == NS_UI_THREAD_EVENTQ) {
+    return GetThreadEventQueue(NS_UI_THREAD, resultQueue);
+  }
+
+  *resultQueue = queueOrConstant;
+  NS_ADDREF(*resultQueue);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsEventQueueServiceImpl::GetSpecialEventQueue(PRInt32 aQueue,
+                                              nsIEventQueue* *_retval)
+{
+  nsresult rv;
+
+  // barf if someone gave us a zero pointer
+  //
+  if (!_retval) {
+    return NS_ERROR_NULL_POINTER;
+  }
+
+  // try and get the requested event queue, returning NS_ERROR_FAILURE if there
+  // is a problem.  GetThreadEventQueue() does the AddRef() for us.
+  //
+  switch (aQueue) {
+  case CURRENT_THREAD_EVENT_QUEUE:
+    rv = GetThreadEventQueue(NS_CURRENT_THREAD, _retval);
+    if (NS_FAILED(rv)) {
+      return NS_ERROR_FAILURE;
+    }
+    break;
+
+  case UI_THREAD_EVENT_QUEUE:
+    rv = GetThreadEventQueue(NS_UI_THREAD, _retval);
+    if (NS_FAILED(rv)) {
+      return NS_ERROR_FAILURE;
+    }
+    break;
+
+    // somebody handed us a bogus constant
+    //
+  default:
+    return NS_ERROR_ILLEGAL_VALUE;
+  }
+
+  return NS_OK;
+}
+