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The ABA problem stems from the fact that we use the pointer value of m_h e a d to determine whether the stack has changed But if nodes can be reused, it could be the case that after reading m_h e a d as a certain value X, the node X could be concurrently popped off the stack, subsequently reused, and then pushed back on the top of the stack as m_h e a d A thread doing an interlocked compare-exchange would then find the value X in the location and the CAS would succeed, because it appears as if the stack never changed Clearly this outcome is incorrect The CAS should have failed The list did change As a concrete example of why this can be a problem, imagine our stack has two nodes: X at the top, and Y just behind it Say a thread tries to pop X off and gets as far as reading its m_n ext pointer into a local variable, seeing Y But it doesn't get as far as executing the CAS, perhaps because it gets preempted by another thread-another thread, that pops X off and then Y, leaving the stack empty Yet another thread comes along, pushes a new node, Z, on, and then (for whatever reason) it pushes X on again If we pooled nodes, the object X might get reused time and time again, each time with a new value inside it At this point, X's m_n ext pointer will refer to Z But when the first thread resumes and performs its CAS, the operation will succeed: it will place Y as the new head-even though Y is long gone-and Z will now go completely missing This mysterious sequence of events is subtle enough to leave you frustrated and scratching your head Avoiding this problem typically requires additional state to be used in the CAS operation, such as a version number that is incremented upon each push and pop In other words, instead of updating one value, we will update two at once: the pointer and a new integer version number Implementing this either requires an extra layer of indirection, like using a separate object, or double CAS operations, such as a 64-bit CAS on a 32-bit machine or a 1 28-bit CAS on a 64-bit machine Since the latter isn't always available on all archi tectures, this makes writing efficient and portable ABA safe data structures difficult This situation won't happen in managed code (unless we explicitly pool nodes) because, unlike VC++, so long as a reference to an object is live, the memory will not be reused This fact, coupled with integration of inter locked operations and the code that performs GCs, ensures ABA safety. java upc-a Generate UPC-A barcode in Java class using Java UPC-A ...
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The configuration for the default implementation is: <barcode> < upc-a > <height>{ length:15mm}</height> <module-width>{length:0.33mm}</module-width> ... Wln32 Singly Linked Lists (SLIsts) Complete boxes 1, 2, and 3 Do not send cash, and do not staple your payment to this voucher Make your check or money order pa yable to the United States Treasury Be sure to enter your employer identification number, Form 940, and 2002 on your payment The ABA problem is difficult and isn't immediately obvious Instead of having to write your own ABA safety mechanisms, Win32 offers a lock free stack called an interlocked singly-linked list that uses the same algorithm explained before, but with embedded ABA safety SLists are used perva sively throughout the Windows kernel itself SLists are represented with an instance of the L I ST_H E AD E R data struc ture To create an empty one, just allocate this memory somewhere, and call the initialization function java upc-a Java UPC-A Generator | Barcode UPCA Generation in Java Class ...
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Integrate UPC-A barcode generation function to Java applications for drawing UPC-A in Java . i = j = k=1 / / i = j = = n=1 / / / void WINAPI I n it i a l i z e S L i stHead ( PS L IST_H EAD E R L i stHead ) ; 3 Enter your business name (individual name for sole proprietors) Entries take the form of S L I ST_E NTRY data structures Typically these will be embedded into other data structures as fields and are used for link ing nodes together internally in the SList code They also contain next pointers to other S L I ST_ENTRY data structures Although these pointers are managed by the SList implementation, you can freely follow them pro vided that you know they are in a good known state You can't actually manipulate the L I ST_H EAD E R structure yourself, as its contents are managed by the OS and are subject to change from one archi tecture to the next Once you have one, however, you can push and pop ele ments on and off the stack java upc-a racca3141/UPC: Build a UPC-A label. - GitHub
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UPC-A barcode generator can print UPC-A and saved it as GIF and JPEG images using Java class library. Generated UPC-A barcode images can be displayed ...
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