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made the following modifications to the code:#include Run resultsWe can confirm the above mentioned, the running time of the thread is determined by the time slice, when the main thread time slice runs out, but the entire main thread has not finished running, the operating system dispatcher will also join the thread's ready queue, from the queue to find a new sub-process to execute.2, using mutually exclusive objects to achieve synchronization:A mutex is a kernel object that guarantees that a t

waiting thread object state changes. Access to a code snippet can be synchronized by locking and unlocking the specified object. Monitor.Enter, Monitor.TryEnter, and monitor.exit are used to lock and unlock the specified object. Once the lock of the specified object (code snippet) is fetched (called Monitor.Enter), no other thread can acquire the lock. For example, thread x obtains an object lock that can be freed (call Monitor.Exit (object) or monitor.wait). When this object lock is freed, the

This article mainly introduces some Linux shell in the relevant knowledge summary, so that the basics of Linux introductory learning, need friends can refer to the Once a file is created, it has three ways to access it: 1) Read, you can display the contents of the file. 2) write, you can edit or delete it. 3 Execute if the file is an S H e l l script or program. The permissions of a file can be grouped into three categories, according to the user being targeted: 1 The owner of the file, th

How to control the relationship between multiple threads, without conflict and repetition, requires the use of mutually exclusive objects, namely: The Mutex class in the System.Threading namespace. We can think of a mutex as a taxi and a passenger as a thread. Passengers first wait for the bus, then get on the bus and finally get off. When a passenger is in the car, the other passengers can only get on when he gets off the bus. This is also true of the thread's relationship to the mutex object,

default Admin user account with a blank password when Access starts. In the background, Access uses the Admin account as the Administrator account for the workgroup. For all databases, tables, queries, forms, reports, and macros that you create, access also uses the Admin account in addition to the owner (group or user) of those objects. Administrators and owners are important because they have the right to be undone: Administrators (members of the Admins group) always have full permissions t

Once a file is created, it has three ways to access it:1) Read, you can display the contents of the file.2) write, you can edit or delete it.3 Execute if the file is an S H e l l script or program.The permissions of a file can be grouped into three categories, according to the user being targeted:1 The owner of the file, the user who created the file.2 the same group of users, owns the file of the user group any user.3 other users, that is, a user who

positioning of its own and possible descendant elements. In simple terms, this means that the element needs to be more costly to maintain itself and its contents, rather than relying on ancestral elements to do the work. Therefore, some elements will have a layout by default. When we say that an element "owns layout" or "gets layout", or that an element "has layout", we mean that its Microsoft proprietary attribute Haslayout is set to true. A "layo

Mytab to Lisi with GRANT option; (indicates that the user's permissions are granted to Lisi and allowed to be granted to other users) 7. Role Management: To create a role: Create role RoleName; Grant permissions to roles: Grant permissions to RoleName; Grant the role to the user: Grant RoleName to UserName; User query-owned role: SELECT * from User_role_privs; Delete roles: Drop role rolename; When granting permissions to a role, the user who owns th

} Therefore, the implementation of synchronization needs to consider all the necessary security to update multiple shared variables, there can be no race conditions, can not destroy the data (assuming the boundary of the synchronization is correct), and to ensure that other threads of correct synchronization can see the latest values of these variables. By defining a clear, cross-platform memory model (which is modified in JDK 5.0 to correct some of the errors in the original definition),

0000000000311a20 0 MTA (Finalizer) 19 4 181c 00000000039853e0 100a220 Enabled 0000000000000000:0000000000000000 0000000000311a20 0 MTA (Threadpool Worker ) 5 221c 0000000003998d00 1220 Enabled 0000000000000000:0000000000000000 0000000000311a20 0 Ukn 21 6 16d8 00000000044484c0 200b220 Enabled 0000000000000000:0000000000000000 00000000039980a0 0 MTA 7 1e54 000 0000004460680 200b220Enabled 0000000000000000:0000000000000000 00000000039980a0 0 MTA 8 1308 000000000445fd20 200b220 enabled 0 00000000

class, which allows you to still respond to interrupts while waiting for a lock. 1//Overwrite interrupt method issue Interrupt Request 2 @Override 3 public void Interrupt () {4 try {5 socket.close (); Close socket 6 } catch before interrupt (IOException e) {7 8 } finally{9 super.interrupt (); }11 }6, the use of newtaskfor to encapsulate non-standard cancellationSecond, stop thread-based servicesApplications ty

Unique_ptr• a unique_ptr owns the objects it manages, and unlike shared_ptr, Unique_ptr points to an object that can have only one user . When the unique_ptr is destroyed, the object it points to is also destroyed.• Unlike shared_ptr, no make_shared_ptr-like standard function returns a unqiue_ptr, when a unique_ptr is defined, it needs to be bound to a pointer returned by new, like shared_ptr, Initialization unique_ptr must take the form of direct ini

class.Define a subclass author to inherit the parent class person, as follows:function Author (name,books) { Author.superClass.constructor.call (this, name); this. book=books; } Extend (Author,person); Author.prototype.getBooks=function () { returnthis. Book; }Here the constructor of the parent class is called through its superclass property in the constructor of the subclass, and the call method is used to transform this point of the method invocation, so that the

frame where the lock was obtained3. Re-entry lock Reentrantlockjava.util.concurrent.lockThe framework in a Lock lock is an abstraction that allows the implementation of a lock to be implemented as a Java class, rather than as a language feature.This leaves space for a variety of Lock implementations that may have different scheduling algorithms, performance characteristics, or locking semantics.ReentrantLockClass is implemented Lock , it has the synchronized same concurrency and memory semantic

/wKioL1j4bnriIV-wAADc6VwWjjE827.png-wh_500x0-wm_ 3-wmp_4-s_1758970625.png "title=" screenshot from 2017-04-18 21-06-17.png "alt=" Wkiol1j4bnriiv-waadc6vwwjje827.png-wh_50 "/>ACL Mask and inheritanceA file with an ACL "has a mask" that can limit the maximum permissions for the group that owns the file, and can limit the maximum permissions that the supplemental users and groups in the ACL haveSetfacl-m M:rwxfileThe "directory can have default ACL" entr

"Hadoop" Owns/usr/hadoop　　sudo chown-r hadoop:hadoop Hadoop2. Edit Environment2.1gedit/etc/Profile Append these:export java_home=/usr/java/Export Jre_home=/usr/java/JRE Export Hadoop_install=/usr/Hadoopexport PATH= $PATH: $JAVA _home/bin: $HADOOP _install/bin: $HADOOP _install/Sbinexport CLASSPATH=./:/usr/java/lib:/usr/java/jre/Lib2.2gedit/usr/hadoop/conf/hadoop-env.sh Append these:# the Java implementation to use. Required.export Java_home=/usr/Java

following characters, a group of three, each of which is a combination of three parameters, is "rwx". where [R] stands for readable (read), [W] stands for writable (write), [x] stands for executable (execute). Note that the location of the three permissions does not change, and if there is no permission, a minus sign [-] is present. The properties of each file are determined by the 10 characters of the first part of the left (for example).0-9 of these numbers are used to indicate from left to r

that currently owns Sk_buff.Tail: Point to the current end address of the protocol data. As with the data pointer, the value of the pointer changes depending on the protocol layer that currently owns the Sk_buff.End: Points to the end of the in-memory data area. As with the head pointer, the value of the pointer is fixed when the Sk_buff is assigned.Sk_buff's two length fields, Len and truesize, describe t

0, Mutual exclusion amountMutex under Windowsis a kernel object that checks whether the current thread ID and the thread ID that owns the mutex are consistent each time WaitForSingleObject and ReleaseMutex.When multiple wait** is required to correspond to multiple ReleaseMutex, when ReleaseMutex too many times if you find that the current possessive mutex thread ID and the current call ReleaseMutex the thread ID is inconsistent, only return flase, Get

processes. Characteristics A Core object If the thread that owns the mutex ends, a "abandoned" error message is generated You can use wait ... () waits for one or more mutexes Can be named so that it can be opened by another process Can only be freed by the thread that owns it. related functions