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describes the file permissions. Read Permission R. Simply put, it is the permission to open the file to view the content. On the web server, if the file does not have the permission to open, the web server considers the file does not exist and sends the 404 file not found error, it is represented by number 4. Write Permission for www.2cto.com. If a file does not have the write permission, the file cannot be changed. If the folder does not have the write permission, a new file cannot be created

Document directory What happens when ElementName binding is used in DataTrigger? In part 1, I gave a general finding rule for ElementName binding, it works in most cases, however there are some cases you cannot explain them with the general rule. I will cover some of them in the following articles which involve some advanced concept in WPF, like BindingExpression and InheritanceContext.What happens when ElementName binding is used in DataTrigger? Take a look at following codes:

buffer Descriptor (BD). To program USB framework communications on pics, you need to understand BDS. A bd consists of four byte-wide registers that hold information about an endpoint's most recent data transfer or the next data transfer. the microcontroller core and the USB Module share ownership of the BD. the microcontroller core is the CPU that executesThe code, or firmware, That you program into the device. the USB Module, also called the Serial Interface Engine (SIE), provides hardware sup

The Xamarin XAML language teaches the template binding of a template-bound control template for a program templateTo make it easy to change property values on controls in a control template, you can implement template binding functionality in a control template. Template bindings allow controls in a control template to bind data to public properties. You need to use TemplateBinding. It can bind the properties of a control in a control template to a bindable property on the parent of the target v

thread that owns the lock (thread Y) does not call pulse or PulseAll, the method may be locked by an indeterminate lock. Pulse, PulseAll and wait must be the code snippet that is being synchronized is called. For each synchronized object, you need a pointer to the thread that currently owns the lock, a ready queue, and a wait queue (containing a thread that needs to be notified of the state change of the l

permissions and ACLs as follows:1. If you are running the process as the user who owns the file, the user right to apply the file2. In addition, if the process is run as a user who is listed in the user ACL entry, the user ACL is applied (as long as mask is allowed)3. Also, if the process is run as a group that matches the group that owns the file or as a group with an explicit group ACL entry, the permiss

other threads that are correctly synchronized can see the latest values for those variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a concurrency class "write once, run Anywhere", by following this simple rule: Whenever you write a variable that might be read by another thread, or if the variable you are reading is finally written by another thread, you must s

synchronization are correct), and that other threads that are correctly synchronized can see the latest values for those variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a concurrency class "write once, run Anywhere", by following this simple rule: Whenever you write a variable that might be read by another thread, or if the variable you are reading is finall

those variables. By defining a clear, cross-platform memory model that has been modified in JDK 5.0 to correct some of the errors in the original definition, it is possible to build a concurrency class "write once, run Anywhere", by following this simple rule: Whenever you write a variable that might be read by another thread, or if the variable you are reading is finally written by another thread, you must synchronize. But now a little better, in the nearest JVM, there is no c

can be accessed by other threads after unlock. Mutex (mutex)The mutex is very similar to the critical section, and only the line that owns the mutex Cheng has access to the resource, and because the mutex has only one, it determines that the shared resource will not be accessed by multiple threads at the same time. The thread that currently occupies the resource should hand over the mutex that it owns afte

access to the new file created, and if the O_CREAT flag is used to create the file, then the Mode argument is generally given. Some of her common values, shown in table 1.0, can be used in a bitwise OR combination. The user who owns the new file and the combination of the suit S_irwxu 00700 File-owned users have read-write and Execute permissions S_IRUSR (S_iread) 00400 The user who

Authorization is access control, which determines whether the user has appropriate access to the resource in the application. For example, determine whether a user has permission to view the page, edit the data permissions, have permissions for a button, have permission to print, and so on. I. Three elements of authorization Authorization has three core elements: permissions, roles, and users. Permissions Permissions are the core elements of Apache's Shiro security mechanism. It explic

borrowed 2 yuan from B, so he bought the island with 3 yuan. He used the borrowed $2 in cash and eliminated the $1 debt owed to him to buy a small island from c. B borrowed 2 yuan for a, so his net worth is 2 yuan. C now has 2 1 yuan coins, his net worth is still 2 yuan. The net worth of this country = 5 yuan. Bubbles are gradually building up. 5) b Seeing the value of land rising, he also wants to own land. So he used 4 yuan to buy a land for a, payment is to C borrowed 2 yuan and lift

Auto_ptr is a smart pointer provided in the current C + + standard library, admittedly, auto_ptr is so unsatisfactory that programmers have to use it very carefully, as with "bare" pointers, to ensure that there is no error. That it can't even apply to so many containers and algorithms in the same standard library, but even so, we still can't deny the value and idea of this little auto_ptr.Here is a auto_ptr version written by Nicolai M. Josuttis ( Namespace std{Template1 Constructors and des

state returns WAIT_OBJECT_0, if the time exceeds the dwmilliseconds value but the time event or no signal state returns wait_timeout;This value is 0, which means returning immediatelyThis value is infinite, which represents infinite waits.return valueWAIT_OBJECT_0: Function returned successfully, signal status detected within the specified timeWait_failed: Function failed, call GetLastError () to see more messagesWait_timeout: Wait time is up, signal status has not been detectedWait_abandoned:

"Prototype" literal translation is "prototype", is the main means of javascript implementation of inheritance. Roughly speaking: prototype is a reserved property of a function in JavaScript, and its value is an object (we can call this object "prototype object").The object that is constructed with this function as a constructor automatically has the member properties and methods of the prototype object that owns the constructor.Among the key points ar

Three basic functions used in thread interaction:void Notify (); Wakes a single thread waiting on this object monitor.void Notifyall (); Wakes all the threads waiting on this object monitor.void Wait () causes the current thread to wait until another thread calls the Notify () or Notifyall () method of this object.The overloaded version of the Wait () also causes the current thread to wait until another thread calls the Notify () or Notifyall () method of this object, or waits longer than the sp