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This article transferred from: http://www.binaryintellect.net/articles/165bb877-27ee-4efa-9fa3-40cd0cf69e49.aspxWhen do you do any additions, modifications and deletions to the Entity Framework DbSet and Call SaveChanges (), EF starts a New transaction and executes all the inserts, UPDATE and DELETE operations inside that newly created transaction. If the call to SaveChanges () succeeds the underlying transaction is committed, otherwise the transaction was rolled back. In some cases-want that mu

. Each of its units holds the entry address of a system invoke service program. The array is defined in/arch/i386/kernel/entry. S, while Nr_syscalls is a macro equal to 256, defined in Include/linux/sys.h. Each system invocation service program is defined in the corresponding file of each module, for example asmlinkage int sys_time (int * tloc) is defined in kerneltime.c; In addition, there are many service programs in KERNELSYS.C; Number of system calls:From 2.4 of 190 to 2.6 of more t

Asynchronously according to our usual way of thinking, the computer should finish one thing and then do the next thing. In terms of this, the way to perform a task is called Synchronous Execution (synchronous Execution). In that case, why introduce the concept of asynchronous execution? Directory Why to use asynchronous calls Steps and mechanisms for implementing asynchronous invocations Why to use asynchronous

Sometimes shutdown immediate is issued when the database is closed, and the command has not been closed. View alert logs. There are hints in the log after waiting for a while:Shutdown:waiting for active calls to complete.The reason is that some processes cannot be cleaned up by the Pmon process. Causes shutdown to shut down and hang.= = "according to observation, in oracle10g and above version number. Will be for example the following prompt:(2015/11/

Reproduced from the spiritual Leap cloud: the original link1. Write in frontA system call is a set of "special" interfaces that the operating system provides to user program calls. Through this set of "special" interface, the user program can obtain the services provided by the operating system kernel, such as file system related system calls to provide open files, close files or read and write file service

Article Title: add system calls in linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. 1. Basic principles of linux system calls The linux system is compatible with POSIX and is also a set of C language function names. However, the internal implementation method of li

Article Title: how to add new system calls in Linux. Linux is a technology channel of the IT lab in China. Including desktop applications, Linux system management, kernel research, embedded systems, open-source systems, and other basic classification system calls are functional interfaces between applications and operating system kernels. The main purpose is to allow users to use the functions provided by t

1. What is system callIn the Linux World, we often encounter the term system call. The so-called system call is a series of functions provided by the kernel with very powerful functions. These system calls are implemented in the kernel, and then the system is called to the user in a certain way. Generally, they are implemented through gate traps. System calling is an interface for user programs to interact with the kernel.Ii. Functions of system calls

An optional chained call (Optional Chaining) is a way to request and invoke properties, methods, and subscripts on an optional value that the current value may be nil. If the optional value has a value, the call succeeds, and if the optional value is nil, the call returns nil. Multiple calls can be joined together to form a chain of calls, and if any one of the nodes is nil, the entire call chain will fail,

In the linux operating system, how to intercept system calls-general Linux technology-Linux programming and kernel information is as follows. The general purpose of using the Linux Kernel Module is to expand the functions of the system or provide drivers to some special devices. In fact, using the Linux kernel module, we can also do some "hacker" tasks, such as intercepting system calls and then processing

Python calls Sina Weibo API project practices, pythonapi I recently came into use to call the Sina Weibo open interface, so I would like to try using python to call the Weibo API. SDK: http://open.weibo.com/wiki/SDK code is not more than a dozen K, can fully understand. If you have a Weibo account, you can create an APP and then obtain the app key and app secret. This is required for the APP to obtain OAuth2.0 authorization. For more information about

In C #. NET calls Java development WebService delivery int,double problem, Java cannot get the value!In C #. NET calls Java developed WebService, the object with the INT attribute is first encapsulated in the client, and when the object is uploaded to the server side, the server side can get the value of String Type property, but cannot get int type, Double and datetime values (null on the server) Workaroun

This is a creation in Article, where the information may have evolved or changed. The previous blog is mainly about how to avoid using too many system threads or processes in high concurrency, but if the number of threads is reduced, the CPU utilization itself is not up, then the capacity of the system is very low, so it is still not able to achieve high concurrency. In general, we will set the number of threads equal to the number of CPUs, the full use of the CPU is equivalent to how to keep th

Soap/http to make Web Service calls. However, it is best to make RPC calls directly over TCP, which is much more effective.1.3. Application of XML Web service1. The initial XML Web Service is often a source of information that can easily be incorporated into the application, such as stock prices, weather forecasts, sports scores, and so on.2. Provide existing applications as XML Web service to build new, m

coursewareDebug kernel with GDB traceqemu -kernel linux-3.18.6/arch/x86/boot/bzImage -initrd rootfs.img -s -S # 关于-s和-S选项的说明：# -S freeze CPU at startup (use ’c’ to start execution)# -s shorthand for -gdb tcp::1234 若不想使用1234端口，则可以使用-gdb tcp:xxxx来取代-s选项Open another Shell windowgdb（gdb）file linux-3.18.6/vmlinux # 在gdb界面中targe remote之前加载符号表（gdb）target remote:1234 # 建立gdb和gdbserver之间的连接,按c 让qemu上的Linux继续运行（gdb）break start_kernel # 断点的设置可以在target remote之前，也可以在之后2. Experimental Process 2.1 GDB breakpo

"Casualet + Original works reproduced please specify the source +" Linux kernel analysis "MOOC course http://mooc.study.163.com/course/USTC-1000029000",Linux systems provide a lot of system calls, this is the user program into 0 privilege level and hardware interaction interface. When we are programming in C, a lot of library functions are used to encapsulate system calls. All system

(name="CABIN_NAME") public String getName( ) { return name; } public void setName(String str) { this.name = str; } @Column(name="CABIN_DECK_LEVEL") public int getDeckLevel( ) { return deckLevel; } public void setDeckLevel(int level) { this.deckLevel = level; }} Definition of business logic Public interface travelagent {/** create a cabin */Public void createcabin (cabin);/** obtain the cabin */Public cabin findcabin (int id );} To support remote and local

All rights reserved. For more information, see all right reserved and copyright by Xu Xing. We have analyzed the kernel execution process caused by system calls in detail. This article will continue to analyze the poll function in the kernel source code of linux2.6.38 (similar to the select implementation, the two are essentially the same, because the implementation mechanism is the same, and the middle-level poll function will be called eventually. T

Programming Interface (API) is a number of predefined functions that provide applications and developers with the ability to access a group of routines based on a software or hardware, without accessing the source code or understanding the details of the internal working mechanism. 4. Differences between the two. A: difference: API is the definition of a function. It specifies the function of this function and has no direct relationship with the kernel. The system

Label: as text method Object C class inheritance does not needSubclass inherits and calls the constructor of the parent class1. if the child class does not define a constructor, it calls the non-parameter constructor of the parent class ,. 2. if a subclass defines a constructor, whether it is a non-parameter or a parameter, when creating a subclass object, first execute the constructor without parameters fo