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One obvious difference when compared to the stack is that m_h e a d can never be n u l l We initialize the queue with a sentinel dummy node, and both m_h e a d and m_t a i l initially refer to it When m_h e a d is equal to m_t a i l, which means that m_h e a d m_n ext is n u l l, the queue is considered empty The reason we do this is the same as why we did for the fine-grained lock ing case: we need to avoid cases that would call for updating both m_h e a d and m_t a i l atomically (ie, when the first element was added o r last ele ment removed) The algorithm uses a subtle trick When enqueuing a new node, we must update the tail node' s next reference to the new node In order to quickly find the new tail node for enqueues, we will use the m_t a i l field Once the tail has been found, we then attempt to CAS the new node as its m_n ext field, using n u l l as the comparison value After this CAS succeeds, however, m_t a i l is actually out of sync and subsequent enqueues may notice it as such To resolve the issue, a thread enqueuing a new node must CAS m_t a i l to point at the newly enqueued node as quickly as possible The trick is that this second CAS may fail, although the first one suc ceeded The algorithm works by having all threads "catch up" the tail in the event that they see that it is out of date, otherwise they would have qr code scanner using webcam in c# Real Time QR Code Reader - MSDN - Microsoft
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The notion behind the presented C# code is to illustrate the basic steps need to be taken for .Net developers to build a simple QR Decoder, and show them how to use the famous zxing library to decode 2D barcode library realtime, either by capturing pictures from a webcam or by uploading a static 2D barcode picture. to wait indefinitely for the enqueuing thread to complete; this would effectively form a lock during enqueue It is easy to detect when a tail is inaccurate: m_t a i l will have a non- n u l l next field The GetTa i lAn d C a t c h U p method encapsulates this logic Before enqueuing anything new, a thread ensures the tail is caught up The tail can only be a single node behind the real tail because in order to enqueue another, it must be up to date But one thread can get stuck continuously updating the tail for many other suc cessfully enqueuing threads Most of the remainder of the algorithm is straightforward and should be familiar due to the similarities to Loc k F reeSt a c k < T > The Get E n umerator method is worth examining in more detail because it is a design point that is apt to come up in practice when developing new containers The imple mentation effectively provides a "snapshot" of the state of the queue at a particular time A thread enumerating the contents will not observe sub sequent updates But there is actually no copying involved It does this by remembering the tail at the time Get E n u m e r a t o r was called; it then subse quently walks the linked list during enumeration and stops when it reaches the tail Because we never modify the m_n ext fields of nodes in the queue after they have been enqueued, we can safely rely on them remaining valid rdlc ean 13, c# code to convert pdf to excel, asp.net ean 13, crystal reports data matrix native barcode generator, asp net mvc barcode scanner, open pdf and draw c# windows phone 8 qr code reader c# read QR-code with c# (อ่าน QR-codeด้วยC#) - YouTube
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Apr 18, 2017 · In this video you will learn how to make your very own QR code scanner by webcam in VB.NET ...Duration: 10:52 Posted: Apr 18, 2017 In my experience, both Osprey and Winnov have pretty much the same technical specifications, and both are recommended by the majority of OEMs Check out the Web sites noted in this chapter to get the latest specifications before you make a decision Part Two of this book moves on to the topic of processing and producing content 7 will discuss audio and video preprocessing Although audio and video preprocessing are not absolutely necessary to provide audio and video streams, it does enhance your streaming quality output and should be examined thoroughly, especially when you are developing your enterprise system This organization deals with standards relating to the broadcast of content It has various working groups dealing with both the de nition of methods for distributing content in IP-based broadcast networks (eg TM-H, TM-UMTS), and the protection of content (eg TM-CPT) c# qr code webcam scanner Windows Forms: QR Code scanner using Camera in C - FoxLearn
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