readerwriterlockslim.cs

破解的飞信源代码

        {
            int millisecondsTimeout = (int) timeout.TotalMilliseconds;
            if ((millisecondsTimeout < -1) || (millisecondsTimeout > 0x7fffffff))
            {
                throw new ArgumentOutOfRangeException("timeout");
            }
            return this.TryEnterUpgradeableReadLock(millisecondsTimeout);
        }

        public bool TryEnterWriteLock(int millisecondsTimeout)
        {
            ReaderWriterCount lrwc;
            int id = Thread.CurrentThread.get_ManagedThreadId();
            bool flag = false;
            if (!this.fIsReentrant)
            {
                if (id == this.writeLockOwnerId)
                {
                    throw new LockRecursionException("LockRecursionException_RecursiveWriteNotAllowed");
                }
                if (id == this.upgradeLockOwnerId)
                {
                    flag = true;
                }
                this.EnterMyLock();
                lrwc = this.GetThreadRWCount(id, true);
                if ((lrwc != null) && (lrwc.readercount > 0))
                {
                    this.ExitMyLock();
                    throw new LockRecursionException("LockRecursionException_WriteAfterReadNotAllowed");
                }
            }
            else
            {
                this.EnterMyLock();
                lrwc = this.GetThreadRWCount(id, false);
                if (id == this.writeLockOwnerId)
                {
                    lrwc.rc.writercount++;
                    this.ExitMyLock();
                    return true;
                }
                if (id == this.upgradeLockOwnerId)
                {
                    flag = true;
                }
                else if (lrwc.readercount > 0)
                {
                    this.ExitMyLock();
                    throw new LockRecursionException("LockRecursionException_WriteAfterReadNotAllowed");
                }
            }
            int spinCount = 0;
        Label_00BC:
            if (this.IsWriterAcquired())
            {
                this.SetWriterAcquired();
            }
            else
            {
                if (flag)
                {
                    uint numReaders = this.GetNumReaders();
                    if (numReaders == 1)
                    {
                        this.SetWriterAcquired();
                        goto Label_01A5;
                    }
                    if ((numReaders == 2) && (lrwc != null))
                    {
                        if (IsRwHashEntryChanged(lrwc, id))
                        {
                            lrwc = this.GetThreadRWCount(id, false);
                        }
                        if (lrwc.readercount > 0)
                        {
                            this.SetWriterAcquired();
                            goto Label_01A5;
                        }
                    }
                }
                if (spinCount < 20)
                {
                    this.ExitMyLock();
                    if (millisecondsTimeout == 0)
                    {
                        return false;
                    }
                    spinCount++;
                    SpinWait(spinCount);
                    this.EnterMyLock();
                    goto Label_00BC;
                }
                if (flag)
                {
                    if (this.waitUpgradeEvent != null)
                    {
                        if (!this.WaitOnEvent(this.waitUpgradeEvent, ref this.numWriteUpgradeWaiters, millisecondsTimeout))
                        {
                            return false;
                        }
                    }
                    else
                    {
                        this.LazyCreateEvent(ref this.waitUpgradeEvent, true);
                    }
                    goto Label_00BC;
                }
                if (this.writeEvent == null)
                {
                    this.LazyCreateEvent(ref this.writeEvent, true);
                    goto Label_00BC;
                }
                if (this.WaitOnEvent(this.writeEvent, ref this.numWriteWaiters, millisecondsTimeout))
                {
                    goto Label_00BC;
                }
                return false;
            }
        Label_01A5:
            if (this.fIsReentrant)
            {
                if (IsRwHashEntryChanged(lrwc, id))
                {
                    lrwc = this.GetThreadRWCount(id, false);
                }
                lrwc.rc.writercount++;
            }
            this.ExitMyLock();
            this.writeLockOwnerId = id;
            return true;
        }

        public bool TryEnterWriteLock(TimeSpan timeout)
        {
            int millisecondsTimeout = (int) timeout.TotalMilliseconds;
            if ((millisecondsTimeout < -1) || (millisecondsTimeout > 0x7fffffff))
            {
                throw new ArgumentOutOfRangeException("timeout");
            }
            return this.TryEnterWriteLock(millisecondsTimeout);
        }

        private bool WaitOnEvent(EventWaitHandle waitEvent, ref uint numWaiters, int millisecondsTimeout)
        {
            waitEvent.Reset();
            numWaiters++;
            this.fNoWaiters = false;
            if (this.numWriteWaiters == 1)
            {
                this.SetWritersWaiting();
            }
            if (this.numWriteUpgradeWaiters == 1)
            {
                this.SetUpgraderWaiting();
            }
            bool flag = false;
            this.ExitMyLock();
            try
            {
                flag = waitEvent.WaitOne(millisecondsTimeout, false);
            }
            finally
            {
                this.EnterMyLock();
                numWaiters--;
                if (((this.numWriteWaiters == 0) && (this.numWriteUpgradeWaiters == 0)) && ((this.numUpgradeWaiters == 0) && (this.numReadWaiters == 0)))
                {
                    this.fNoWaiters = true;
                }
                if (this.numWriteWaiters == 0)
                {
                    this.ClearWritersWaiting();
                }
                if (this.numWriteUpgradeWaiters == 0)
                {
                    this.ClearUpgraderWaiting();
                }
                if (!flag)
                {
                    this.ExitMyLock();
                }
            }
            return flag;
        }

        public int CurrentReadCount
        {
            get
            {
                int numReaders = (int) this.GetNumReaders();
                if (this.upgradeLockOwnerId != -1)
                {
                    return (numReaders - 1);
                }
                return numReaders;
            }
        }

        public bool IsReadLockHeld
        {
            get
            {
                return (this.RecursiveReadCount > 0);
            }
        }

        public bool IsUpgradeableReadLockHeld
        {
            get
            {
                return (this.RecursiveUpgradeCount > 0);
            }
        }

        public bool IsWriteLockHeld
        {
            get
            {
                return (this.RecursiveWriteCount > 0);
            }
        }

        private bool MyLockHeld
        {
            get
            {
                return (this.myLock != 0);
            }
        }

        public LockRecursionPolicy RecursionPolicy
        {
            get
            {
                if (this.fIsReentrant)
                {
                    return LockRecursionPolicy.SupportsRecursion;
                }
                return LockRecursionPolicy.NoRecursion;
            }
        }

        public int RecursiveReadCount
        {
            get
            {
                int id = Thread.CurrentThread.get_ManagedThreadId();
                int readercount = 0;
                this.EnterMyLock();
                ReaderWriterCount threadRWCount = this.GetThreadRWCount(id, true);
                if (threadRWCount != null)
                {
                    readercount = threadRWCount.readercount;
                }
                this.ExitMyLock();
                return readercount;
            }
        }

        public int RecursiveUpgradeCount
        {
            get
            {
                int id = Thread.CurrentThread.get_ManagedThreadId();
                if (this.fIsReentrant)
                {
                    int upgradecount = 0;
                    this.EnterMyLock();
                    ReaderWriterCount threadRWCount = this.GetThreadRWCount(id, true);
                    if (threadRWCount != null)
                    {
                        upgradecount = threadRWCount.rc.upgradecount;
                    }
                    this.ExitMyLock();
                    return upgradecount;
                }
                if (id == this.upgradeLockOwnerId)
                {
                    return 1;
                }
                return 0;
            }
        }

        public int RecursiveWriteCount
        {
            get
            {
                int id = Thread.CurrentThread.get_ManagedThreadId();
                int writercount = 0;
                if (this.fIsReentrant)
                {
                    this.EnterMyLock();
                    ReaderWriterCount threadRWCount = this.GetThreadRWCount(id, true);
                    if (threadRWCount != null)
                    {
                        writercount = threadRWCount.rc.writercount;
                    }
                    this.ExitMyLock();
                    return writercount;
                }
                if (id == this.writeLockOwnerId)
                {
                    return 1;
                }
                return 0;
            }
        }

        public int WaitingReadCount
        {
            get
            {
                return (int) this.numReadWaiters;
            }
        }

        public int WaitingUpgradeCount
        {
            get
            {
                return (int) this.numUpgradeWaiters;
            }
        }

        public int WaitingWriteCount
        {
            get
            {
                return (int) this.numWriteWaiters;
            }
        }
    }
}