/// <summary>
/// Runs operation with Writer lock privelege.
/// </summary>
/// <param name="lockObj"></param>
/// <param name="timeout"></param>
/// <param name="doWork"></param>
/// <returns></returns>
public static void GetWriteLock(ReaderWriterLock lockObj, int timeout, DoWorkFunc doWork)
{
RWLockStatus status = (lockObj.IsWriterLockHeld ? RWLockStatus.WRITE_LOCK : (lockObj.IsReaderLockHeld ? RWLockStatus.READ_LOCK : RWLockStatus.UNLOCKED));
LockCookie writeLock = default(LockCookie);
if (status == RWLockStatus.READ_LOCK)
{
writeLock = lockObj.UpgradeToWriterLock(timeout);
}
else if (status == RWLockStatus.UNLOCKED)
{
lockObj.AcquireWriterLock(timeout);
}
try {
doWork();
} finally {
if (status == RWLockStatus.READ_LOCK)
{
lockObj.DowngradeFromWriterLock(ref writeLock);
}
else if (status == RWLockStatus.UNLOCKED)
{
lockObj.ReleaseWriterLock();
}
}
}
/// <summary>
/// Runs operation with Reader lock privilege.
/// </summary>
/// <param name="lockObj"></param>
/// <param name="timeout"></param>
/// <param name="doWork"></param>
/// <returns></returns>
public static void GetReadLock(ReaderWriterLock lockObj, int timeout, DoWorkFunc doWork)
{
bool releaseLock = false;
if (!lockObj.IsWriterLockHeld && !lockObj.IsReaderLockHeld)
{
lockObj.AcquireReaderLock(timeout);
releaseLock = true;
}
try {
doWork();
} finally {
if (releaseLock)
{
lockObj.ReleaseReaderLock();
}
}
}
public static ResultType GetReadLock <ResultType>(ReaderWriterLockSlim lockObj, int timeout, DoWorkFunc <ResultType> doWork)
{
bool releaseLock = false;
if (!lockObj.IsWriteLockHeld && !lockObj.IsReadLockHeld)
{
lockObj.EnterUpgradeableReadLock();
releaseLock = true;
}
try
{
return(doWork());
}
finally
{
if (releaseLock)
{
lockObj.ExitUpgradeableReadLock();
}
}
}
public static ResultType GetWriteLock <ResultType>(ReaderWriterLockSlim lockObj, int timeout, DoWorkFunc <ResultType> doWork)
{
LockStatus status = (lockObj.IsWriteLockHeld
? LockStatus.WriteLock
: (lockObj.IsReadLockHeld ? LockStatus.ReadLock : LockStatus.Unlocked));
if (status == LockStatus.ReadLock)
{
lockObj.TryEnterWriteLock(timeout);
}
else if (status == LockStatus.Unlocked)
{
lockObj.TryEnterWriteLock(timeout);
}
try
{
return(doWork());
}
finally
{
if (status == LockStatus.ReadLock)
{
lockObj.ExitWriteLock();
}
else if (status == LockStatus.Unlocked)
{
lockObj.ExitWriteLock();
}
}
}
public static TResult GetReadLock <TResult>(ReaderWriterLock lockObj, int timeout, DoWorkFunc <TResult> doWork)
{
var releaseLock = false;
if (!lockObj.IsWriterLockHeld && !lockObj.IsReaderLockHeld)
{
lockObj.AcquireReaderLock(timeout);
releaseLock = true;
}
try
{
return(doWork());
}
finally
{
if (releaseLock)
{
lockObj.ReleaseReaderLock();
}
}
}
public static TResult GetWriteLock <TResult>(ReaderWriterLock lockObj, int timeout, DoWorkFunc <TResult> doWork)
{
var status = (lockObj.IsWriterLockHeld ? RWLockStatus.WriteLock : (lockObj.IsReaderLockHeld ? RWLockStatus.ReadLock : RWLockStatus.Unlocked));
var writeLock = default(LockCookie);
if (status == RWLockStatus.ReadLock)
{
writeLock = lockObj.UpgradeToWriterLock(timeout);
}
else if (status == RWLockStatus.Unlocked)
{
lockObj.AcquireWriterLock(timeout);
}
try
{
return(doWork());
}
finally
{
if (status == RWLockStatus.ReadLock)
{
lockObj.DowngradeFromWriterLock(ref writeLock);
}
else if (status == RWLockStatus.Unlocked)
{
lockObj.ReleaseWriterLock();
}
}
}
