travelocity acquired

monitor. The instance method locks the monitor for the corresponding instance.Synchronization is implemented using the Monitorenter and Monitorexit directives. Monitorenter attempts to get the lock on the object, assuming that the object is not locked or when the thread has acquired the lock. Then put the lock counter +1, the same monitorexit the lock counter-1.So synchronized is reentrant for the same thread.The monitor supports two types of threads

Apache suspended animation, Apache maintenance, Master Please come in, thank you A few days ago, Apache still died every 1 days, I have been trying to solve, but these two days, every one hours to die once, if after his death, I do not manually end the process in the Httpd.exe, will appear the following log: HTML Code ...... [Sun 16 09:20:45 2009] [Notice] Parent:child process exited with status 1--restarting. [Sun 16 09:20:45 2009] [Notice] apache/2.2.4 (WIN32) configured--resuming norm

. PackageCn.com.thread;ImportJava.util.concurrent.locks.ReentrantReadWriteLock; Public classReadwritelock {PrivateReentrantreadwritelock lock =NewReentrantreadwritelock (); Public voidRead () {Try{lock.readlock (). Lock (); System.out.println (Thread.CurrentThread (). GetName ()+ "at" + system.currenttimemillis ()/1000 + "time to get a read lock"); Thread.Sleep (1000); } Catch(Exception e) {e.printstacktrace (); } finally{lock.readlock (). Unlock (); } } Public voidwrite () {Try{lock.wri

to effectively create native user interface layouts that can be shared across IOS, Android, Windows Phone, and universal Windows platform apps. 2), Xamarin working principle The android application is compiled into IL code and then JIT-compiled (dynamically compiled) at startup, and a mono runtime is included when the program is published. iOS, however, compiles the code directly to the arm through AOT compilation (static compilation). See details: Http://xamarin.com/how-it-works

synchronous code block), other threads can still access the object's non-synchronized method.3. When a thread has acquired a lock on the synchronized (this) synchronous method (or block) of the object object, it can still be acquired by other threads during the same CPU cycle, and the two locks do not have a resource race condition.After we have a basic understanding of the categories of built-in locks, we

needs to be refreshed periodically, and repeated acquisition will cause the last acquired access_token to fail. Understand ◦ We simply flip through the document to find that many advanced features, such as custom menus, material management, user management, account management, and other advanced feature request links have the "? Access_token=token" parameter, which is the global invocation parameter, Micro-letter backstage need to be based on this p

) in the execution process, as a result of contention for resources caused by a mutual wait for the phenomenon, without external forces, they will not be able to push down.The necessary conditions for a deadlock to occur:1. Mutually exclusive conditions: the so-called mutual exclusion is the process at a certain time exclusive resources.2. Request and Retention conditions: a process that is blocked by requesting resources, retains the resources that have been

individually. Lock (), Trylock (), Trylock (long, Timeunit unit), and lockinterruptibly () are used to acquire locks. The UnLock () method is used to release the lock. Newcondition () returns a new Condition instance bound to this Lock for collaboration between threads, as described in the article "Java Concurrency: Communication and collaboration between threads." 1). Lock () Four methods are declared in lock to acquire a lock, so what is the difference between the four methods? First, the loc

as a "hot" log file because it exists to restore the consistency state of the database. When a process is updating a database, the application or OS suddenly crashes, so that the update operation is not completed successfully. So we can say that "hot" log only in exceptional conditions will be generated, if everything is very smooth, the file will never exist. Iv. Data writing: If a process wants to perform a write operation on the database, it must first acquire a shared lock and then acquir

. getClassLoader (),NewClass[] {Connection.class},NewConnectionhandler ()); }}The following is an example to test the operation of the simple database connection pool, simulating the process of client Connectionrunner acquiring, using, and finally releasing the connection, when it is used, the connection will increase the number of connections acquired, and conversely, will increase the number of non-acquired