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When a writer is writing the data, all other writers and readers will be blocked until the writer is finished writing. A common use might be to control access to a data structure in memory that cannot be updated atomically and is invalid (and should not be read by another thread) until the update is complete.
The writers on the other hand don't need to lock it individually. Only the first writer will lock the readtry and then all subsequent writers can simply use the resource as it gets freed by the previous writer. The very last writer must release the readtry semaphore, thus opening the gate for readers to try reading.
Standard output is a stream to which a program writes its output data. The program requests data transfer with the write operation. Not all programs generate output. For example, the file rename command (variously called mv, move, or ren) is silent on success. Unless redirected, standard output is inherited from the parent process.
For example, a BufferedReader may contain a InputStreamReader, which in turn contains a FileInputStream, and calling close on the BufferedReader in turn closes the InputStreamReader, which in turn closes the FileInputStream, which in turn releases the system file resource. Indeed, the object that directly uses the resource can even be anonymous ...
*/ import javax.swing.JOptionPane; import java.awt.Component; import java.io.BufferedReader; //import java.io.BufferedWriter; import java.io.FileReader; //import java.io.FileWriter; import java.io.IOException; import java.net.URL; import java.util.HashMap; import java.util.Iterator; import java.util.TreeMap; //import java.util.FileReader ...
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Read-copy-update insertion procedure. A thread allocates a structure with three fields, then sets the global pointer gptr to point to this structure.. A key property of RCU is that readers can access a data structure even when it is in the process of being updated: RCU updaters cannot block readers or force them to retry their accesses.
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