Timeout I n f i n i te) may be passed to indicate no timeout is desired Also in VS .NET

Creation ANSI/AIM Code 128 in VS .NET Timeout I n f i n i te) may be passed to indicate no timeout is desired Also
Timeout I n f i n i te) may be passed to indicate no timeout is desired Also
Code-128 Maker In .NET Framework
Using Barcode maker for VS .NET Control to generate, create USS Code 128 image in .NET framework applications.
note another slight difference: unlike most timeout variants, these do not return a bool; instead, they will throw an App l i c a t i o n E x c e p t i o n if the acquisition does not succeed prior to the timeout expiring If you attempt to release a lock mode that is not held by the calling thread, an A p p l i c a t i o n E xception will be thrown This lock also freely supports any kind of recursion you might attempt: shared-to-shared, exclusive-to-exclusive, shared-to-exclusive, and exclusive-to-shared Note that shared-to-exclusive recursion is very dangerous for reasons already outlined : it is highly susceptible to dead lock The lock offers properties to inquire as to the current state of the lock, I s R e a d e r L o c k H e l d and I sW r i t e r Lo c k H e l d , which are useful when asserting ownership If both the shared and exclusive lock are held by the current thread (due to recursion), I s R e a d e r Lo c k H e l d will return f a l s e anyway There is another way of releasing ownership of the lock, the R e l e a s e Loc k method
Code 128 Code Set A Reader In VS .NET
Using Barcode scanner for .NET Control to read, scan read, scan image in .NET applications.
p u b l i c Loc kCook ie Relea s e Loc k ( ) ;
Barcode Maker In .NET
Using Barcode maker for Visual Studio .NET Control to generate, create bar code image in VS .NET applications.
This is used to release the lock completely in just a single method call, including all recursive calls made on the calling thread It returns a L oc k Coo k i e structure, which can be subsequently used to restore the entire sequence of recursive lock acquisitions later on with the R e s t o r e L o c k method
Reading Barcode In Visual Studio .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
p u b l i c void Restore Loc k ( ref LockCookie loc kCook ie ) ;
Make Code 128 Code Set C In C#
Using Barcode creator for VS .NET Control to generate, create Code 128B image in .NET framework applications.
This is a dangerous practice because, once the lock has been released, additional threads can sneak in and invalidate any invariants that held before the call to R e l e a s e L o c k Similarly, the thread releasing the lock must ensure that invariants are consistent so that the state is not seen as being corrupted by other threads that may enter the lock It is a much better prac tice to cleanly unwind and pair each recursive acquisition with a release R e l e a s e Lo c k and R e s t o r e Loc k can be used in some very limited circum stances where you need to ensure a thread's acquisitions do not hold up progress in the system, such as when waiting for a COM synchronization context
Print Code 128 Code Set A In Visual Studio .NET
Using Barcode drawer for ASP.NET Control to generate, create Code 128A image in ASP.NET applications.
C h a pter 6 : D a t a a n d C o n t ro l Syn c h ro n i z a t i o n
ANSI/AIM Code 128 Drawer In Visual Basic .NET
Using Barcode creation for .NET Control to generate, create Code 128 Code Set A image in Visual Studio .NET applications.
Upgrading
Making Data Matrix ECC200 In .NET Framework
Using Barcode creation for .NET Control to generate, create Data Matrix 2d barcode image in VS .NET applications.
As noted before, the R e a d e rW r i t e r Lo c k type does support upgrading and downgrading, albeit in an inferior way It has three methods for this purpose
Barcode Encoder In VS .NET
Using Barcode generation for .NET Control to generate, create bar code image in VS .NET applications.
p u b l i c void DowngradeF romWrite rLoc k ( ref Loc kCoo k i e loc kCook ie ) j p u b l i c LockCookie Upgrad eToWriterLoc k ( int t imeoutMi l l i second s ) j p u b l i c Loc kCoo k i e Upgrad eToWriterLoc k ( TimeSpan t imeout ) j
USS-128 Creator In Visual Studio .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create EAN / UCC - 14 image in Visual Studio .NET applications.
Due to issues noted before with potential deadlocks for simple shared to-exclusive upgrades, when a call to UpgradeToWrite r Lo c k is made, the shared mode lock is first released If the timeout expires, an Ap p l i c ation E x c e pt io n will be thrown Otherwise, the lock will have been released and a write lock will have been acquired The method returns a Loc kCoo k ie, which must be used to downgrade back to the recursive state that was present before the upgrade It is not sufficient to call R e l e a s eWri t e r L o c k There is a subtle "gotcha" lurking here Because the lock is released entirely during an upgrade, other writer threads may acquire the lock, mutate state, and so forth, before the upgrade completes Therefore, once the thread performing the upgrade is granted the exclusive lock, it must always validate that a writer hasn' t snuck in and invalidated the state that was read leading up to the decision to upgrade This is done with the lock's W r i t e rSeqNum property Each time an exclusive lock is granted, this number is incremented Therefore, a thread must read it before upgrading and val idate that it hasn't changed once it successfully upgrades the lock This can be done by hand or with the AnyW r i t e r s S i n c e method
Code 128 Code Set A Maker In .NET
Using Barcode generator for VS .NET Control to generate, create Code-128 image in .NET applications.
R e a d e rWrit e r Loc k rwl = j e l s ewhere rwl Ac q u i reReaderLoc k ( Timeout l nfinite ) j t ry { wh i l e ( t ru e ) if ( n e e d to upgrade { i n t seqNum = rwl WriterSeq N u m j L o c k C o o k i e u c = rwl Upgrad eToWrit e r Loc k ( Timeout l nfinite ) j t ry { if ( rwl AnyWrit e r s S i n c e ( seqNum
MSI Plessey Encoder In VS .NET
Using Barcode creator for Visual Studio .NET Control to generate, create MSI Plessey image in Visual Studio .NET applications.
)
Scanning Code 128 Code Set C In .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
R e a d e r , W riter Locks ( R WLs)
DataMatrix Scanner In .NET Framework
Using Barcode reader for Visual Studio .NET Control to read, scan read, scan image in VS .NET applications.
II A writer s n u c k i n O u r dec i s ion to u p g r a d e I I may n o w be i n v a l idated , so w e t ry aga i n cont i n u e ;
Print Code 39 Full ASCII In Visual Basic .NET
Using Barcode maker for .NET framework Control to generate, create Code 39 image in VS .NET applications.
Bar Code Creator In VB.NET
Using Barcode printer for VS .NET Control to generate, create bar code image in .NET applications.
EAN 128 Drawer In .NET
Using Barcode encoder for ASP.NET Control to generate, create UCC - 12 image in ASP.NET applications.
Data Matrix Encoder In Java
Using Barcode creator for Java Control to generate, create Data Matrix 2d barcode image in Java applications.