egl/eglrefimpl/src/syncobj.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 01:47:50 +0200
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permissions -rw-r--r--
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// Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// Reference EGL implementation to support EGL sync objects and OpenWF extensions
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#include "eglprivate.h"
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CEglSync::CEglSync(CEglDisplay& aDisplay):
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    iDisplay(aDisplay),
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    iType(EGL_SYNC_REUSABLE_KHR),
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    iStatus(EGL_UNSIGNALED_KHR)
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    {
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    }
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CEglSync::~CEglSync()
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    {
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    iCondVar.Close();
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    iMutex.Close();
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    }
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TInt CEglSync::Construct()
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    {
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    TInt err = iMutex.CreateLocal();
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    if (err != KErrNone)
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        {
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        return err;
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        }
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    err = iCondVar.CreateLocal();
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    if (err != KErrNone)
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        {
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        return err;
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        }
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    err = iDisplay.RegisterSyncObj(*this);
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    if (err != KErrNone)
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        {
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        return err;
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        }
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    iRefCount = 1;
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    return KErrNone;
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    }
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CEglSync* CEglSync::Create(CEglDisplay& aDisplay)
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    {
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    // sync object will be allocated in the EGL shared heap and added to sync object list
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    // we need to switch current heap to EGL shared heap
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    //
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    RHeap* callerHeap = User::SwitchHeap(&aDisplay.Heap());
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    CEglSync* syncObj = new CEglSync(aDisplay);
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    if (!syncObj)
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        {
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        User::SwitchHeap(callerHeap);
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        return NULL;
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        }
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    const TInt err = syncObj->Construct();
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    if (err != KErrNone)
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        {
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        delete syncObj;
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        User::SwitchHeap(callerHeap);
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        return NULL;
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        }
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    User::SwitchHeap(callerHeap);
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    return syncObj;
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    }
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void CEglSync::Destroy()
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    {
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    // multiple calls to Destroy() is not allowed, it's either coming from eglDestroySyncKHR or eglTerminate
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    //
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    __ASSERT_DEBUG(!iIsDestroyed, User::Panic(KEglPanicCategory, EEglPanicSyncObjHasBeenDestroyed));
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    iIsDestroyed = ETrue;
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    // wake up all waiting threads
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    iCondVar.Broadcast();
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    // always remove sync obj from hash map when it is destroyed, the actual deletion will be done from Close(),
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    // which can happen when eglClientWaitSyncKHR is called by user
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    RHeap* callerHeap = User::SwitchHeap(&iDisplay.Heap());
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    iDisplay.UnregisterSyncObj(*this);
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    User::SwitchHeap(callerHeap);
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    // decrement refcount for this sync obj, it will delete the object if refcount is zero
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    Close();
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    }
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void CEglSync::Close()
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    {
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    if (--iRefCount == 0)
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        {
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        // we're here either from Destroy() or eglClientWaitSyncKHR
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        RHeap* callerHeap = User::SwitchHeap(&iDisplay.Heap());
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        delete this;
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        User::SwitchHeap(callerHeap);
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        }
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    }
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void CEglSync::Signal(EGLenum aMode)
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    {
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   115
    iMutex.Wait();
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   116
    if (iStatus != aMode)
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   117
        {
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        iStatus = aMode;
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   119
        if (iStatus == EGL_SIGNALED_KHR)
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   120
            {
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   121
            iCondVar.Broadcast();
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   122
            }
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   123
        }
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   124
    iMutex.Signal();
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   125
    }
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   126
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   127
EGLint CEglSync::Wait(EGLTimeKHR aTimeOut)
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   128
    {
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   129
    // driver display lock is not held when we're about to enter block wait on condition variable
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   130
    // we use sync object mutex to synchronise threads access from this point until end of this function
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   131
    iMutex.Wait();
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   132
    EGLint errCode = EGL_CONDITION_SATISFIED_KHR;
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   133
    
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   134
    if (iStatus == EGL_UNSIGNALED_KHR)
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   135
        {
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   136
        switch(aTimeOut) 
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   137
            {
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   138
            case EGL_FOREVER_KHR:
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   139
                {
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   140
                const TInt res = iCondVar.Wait(iMutex); 
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   141
                //we do not expect to fail here
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   142
                __ASSERT_DEBUG(res == KErrNone, User::Panic(KEglPanicCategory, EEglPanicCondVarWaitFail));
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   143
                break;
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parents:
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   144
                }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   145
            case 0:
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parents:
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   146
                {
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   147
                //by setting this we notify the caller that the sync object is in unsignaled state
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   148
                errCode = EGL_TIMEOUT_EXPIRED_KHR; 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   149
                break;
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   150
                }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   151
            default:
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   152
                {
5d03bc08d59c Revision: 201003
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   153
                // Since the supported range of timeout at function RCondVar::TimedWait(mutex, timeout) 
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   154
                // is 0 to KMaxTInt, looping mechanism below is used to support 64bit timeout.      
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   155
                //
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parents:
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   156
                TInt res = KErrTimedOut;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   157
                for(TInt64 timeoutMicroseconds = aTimeOut/1000; (res == KErrTimedOut) && (timeoutMicroseconds > 0); timeoutMicroseconds -= KMaxTInt)
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   158
                    {
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   159
                    res = iCondVar.TimedWait(iMutex, (timeoutMicroseconds > KMaxTInt?KMaxTInt:timeoutMicroseconds));
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   160
                    //we do not expect to fail here
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   161
                    __ASSERT_DEBUG(res == KErrNone || res == KErrTimedOut, User::Panic(KEglPanicCategory, EEglPanicCondVarTimedWaitFail));
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parents:
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   162
                    }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   163
                if(res == KErrTimedOut)
5d03bc08d59c Revision: 201003
Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   164
                    {
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   165
                    errCode = EGL_TIMEOUT_EXPIRED_KHR;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   166
                    }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   167
                break;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   168
                }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
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   169
            }
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   170
        }
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   171
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   172
    iMutex.Signal();
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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   173
    return errCode;
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
parents:
diff changeset
   174
    }