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NET Core Barcode is a cross-platform Portable Class Library that generates barcodes using barcode fonts. It supports Windows, macOS and Linux, and can be ... Notice that we added a new field, lockObject, which holds a reference to an object whose only job is to be the thing on which we acquire a lock. And we simply acquire this lock inside the methods that work with the list of items. We have to hold the lock for the whole of the UseItem method, because the code looks at the state of the items list right at the start, and then the rest of its operation is guided by what it found. The code simply won t work if the items list changes halfway through, and so we hold on to the lock for the duration. In this particular case, holding the lock for the whole method is unlikely to cause problems because this method won t take long to run. But as a general rule, you want to avoid holding locks for any longer than necessary. The longer you hold a lock, the greater the chances of some other thread wanting to acquire the same lock, and being forced to wait. It s a particularly bad idea to call code that might make a request over a network and wait for a response while you re holding a lock (e.g., holding a lock while making a request to a database). Be particularly wary of acquiring multiple locks holding on to a lock while attempting to acquire another is a good recipe for deadlock. Sometimes it s inevitable, though, in which case you need to devise a strategy to avoid deadlocks. That s beyond the scope of this book, but if you find yourself in this situation lock leveling is a suitable solution to this problem searching the Web for lock leveling for multithreading would be a good place to start. Common causes for some of the problems you encounter in a production Linux system include: The root password changed. The Bootloader was overwritten. You re experimenting with the files in /etc. You will learn how to recover from each of these problems using the CentOS rescue environment. Before continuing with the exercises, I recommend you run a chroot to your Linux system partition: chroot /mnt/sysimage. This command puts you inside the /mnt/sysimage directory and makes it the current root partition of the rescue environment. Doing this makes it easier to run commands and access personal data as if you were logged into your system. For example, you need to run ls /mnt/sysimage/home if you didn t use the chroot command to check the contents of your own system s home directory. If you did use the chroot command, you can use ls /home instead. As we mentioned several pages ago, the Monitor class isn t just about locking. It also provides a form of notification. asp.net ean 13 EAN - 13 Barcode Generator for ASP . NET Web Application
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