asp.net data matrix reader

asp.net data matrix reader

asp.net data matrix reader

integrate barcode scanner into asp.net web application, asp.net code 128 reader, asp.net code 39 reader, asp.net data matrix reader, asp.net ean 128 reader, asp.net ean 13 reader, asp.net pdf 417 reader, asp.net qr code reader

java qr code reader for mobile, crystal reports insert qr code, qr code generator c# dll free, rdlc barcode font, code 128 excel generator, crystal report ean 13 formula, crystal reports barcode 128 free, rdlc qr code, asp.net code 39 barcode, c# upc-a

asp.net data matrix reader,

asp.net data matrix reader,
asp.net data matrix reader,

asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,

asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,
asp.net data matrix reader,

With this information, the system can determine whether deadlock has occurred. All it needs to do is determine whether there is some way all processes can have their requests met, and then continue to execute. If there is some way all processes can complete, then there is no deadlock. In this case, no resources are available; all resources are already allocated. However, P0 and P2 are not requesting any more resources. Suppose P0 and P2 run to completion; P0 will release one CD-ROM drive, and P2 will release three printers and three plotters. At that point Available = [3, 1, 3]. Now the requests of P1 for two more printers and two more plotters can be satisfied; P1 can complete; and P1 can return the two printers it already has, plus the two more it requested. Now Available = [5, 1, 3]. It s obvious that similar reasoning shows that the requests of the remaining processes can be satisfied, and therefore there is no deadlock at this time. Suppose, however, that one small change is made to the matrix Requests. Suppose that P2 has a pending request for one plotter. Now the matrix Requests looks like this: Requests CD 0 0 0 0 0

1 2 3 4 5 6

public static int fib(int n) { if (n < 2) { return n; // basis } return fib(n-1) + fib(n-2); // recursive part }

P 0 2 0 1 0

Here is a simple test driver for the Fibonacci method:

birt code 128, gs1-128 word, word 2010 ean 13, word pdf 417, birt ean 13, microsoft word barcode template

P0 can still proceed as in our earlier analysis, and when it completes it will return one CD ROM drive Then Available = [0, 1, 0] Unfortunately, there is no way to satisfy the requests of any other process, and P1, P2, P3, and P4 are deadlocked Deadlock recovery Once the system detects a deadlock, the next question is what to do about it Some resource could be preempted from one of the processes, but the operating system probably will not know the consequences of such an action One of the processes could be terminated, but again the consequences will probably be unknown What if the deadlocked process had just withdrawn $1000 from a savings account, and was now blocked as it attempted to deposit that money in a checking account One wouldn t want to terminate the process; nor would one want to restart it.

1 2 3 4 5

public static void main(String[] args) { for (int n = 0; n < 16; n++) { System.out.println("fib(" + n + ") = " + fib(n)); } }

An exception might be if one of the processes were a compiler or some other process whose computation could be restarted from the beginning Since such a process could be safely restarted, it could be terminated in order to free resources Such action might or might not, depending on the circumstances, remove the deadlock Most data-base systems have the ability to roll back transactions that fail, and a data-base management system may provide for rollback in the face of deadlocked access to data-base tables and rows In fact, modern data-base management systems are the most likely application area to find implementations of deadlock detection and recovery In the end, it may be best for the system to simply announce that a deadlock has occurred and let the operator take some action the operator thinks appropriate.

TRACING A RECURSIVE CALL Hand tracing the execution of a method usually helps clarify it. EXAMPLE 9.7 Tracing the Recursive Factorial Function

Here is a trace of the call f(5) to the recursive factorial function defined in Example 9.2:

Deadlock detection is potentially expensive of computing time, especially if run frequently, and the question of what action to take when a deadlock occurs is usually too difficult to automate As a result, general-purpose operating systems almost never try to manage deadlock On the other hand, data-base management systems often do try to detect deadlocks and recover from them within the narrower purview of data-base management SCHEDULING One of the very most important tasks of an operating system is to schedule processes and threads for execution In the early days of computing, the programmer would load the program into memory somehow (front panel switches, paper tape, etc), and then press the start button Very soon the task of starting, interrupting, and restarting processes became the bailiwick of the OS.

The call originates in the main() function, passing 5 to the f() function. There, the value of the parameter n is 5, so it calls f(4), passing 4 to the f() function. There the value of the parameter n is 4, so it calls f(3), passing 3 to the f() function. This process continues (recursively) until the call f(1) is made from within the call f(2). There, the value of the parameter n is 1, so it returns 1 immediately, without making any more calls. Then the call f(2) returns 2*1 = 2 to the call f(3). Then the call f(3) returns 3*2 = 6 to the call f(4). Then the call f(4) returns 4*6 = 24 to the call f(5). Finally, the call f(5) returns the value 120 to main().

SAY IT LIKE OBAMA AND WIN!

The trace in Example 9.7 shows that the call f(n) to the recursive implementation of the factorial function will generate n 1 recursive calls. This is clearly very inefficient compared to the iterative implementation shown in Example 9.3. EXAMPLE 9.8 Tracing the Recursive Fibonacci Function

.net core barcode generator, .net core qr code generator, tesseract ocr pdf to text c#, c# .net core barcode generator