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This article transferred from: http://blog.csdn.net/kernel_learner/article/details/7331505In Linux, system calls are the only means of user-space access to the kernel, which is the only legitimate entry for the kernel.In general, applications are programmed through the Application Programming interface (API) rather than directly through the system call, and this programming interface does not actually need to correspond to the system

Asp.net|web For the Atlas program, in some cases, we need to call a large number of web Service in a short time, such as a quick click deletion of a user in a list. At this time network bandwidth, stability and so on tend to cause a longer delay. If these calls can be packaged into a single request, the user simply has to endure a network delay to get the result of processing and indirectly to improve efficiency. It doesn't seem to be a very easy to

PrefaceMost of this article comes fromMikeperetzAsynchronous Method invocation and some of my personal experience, I hope to help you. The original English literature can be found in the CodeProject.IntroductionThis article describes the implementation mechanism of asynchronous calls and how to invoke asynchronous methods. Most. NET developers, after delegate, Thread, asynchronousinvocation, often confuse and misuse the above concepts. In fact, the ab

Do you want to save money by dialing long-distance calls over the network? Chip will take Skype as an example, from the hardware and software configuration, commissioning, to introduce you how to make a phone call through the network, with online friends voice chat, hold a multiplayer voice conferencing and related use skills to help you understand, use the internet phone. Currently, Skype is a very popular internet telephony software, unlike previou

The lightweight RPC framework that supports Weibo calls is Motan officially open source, with the project address Https://github.com/weibocom/motan. Weibo technical team hopes to have more excellent open source people in the future, and further improve the optimization. Microblogging lightweight RPC Framework Motan formal Open source Motan, a lightweight, java-based RPC framework developed by the microblogging team, has been on the inside of Weibo for

Learning the Linux system Driver development has been a large half a year, the mind has been a doubt: that is, such as open, write, read and other system calls is how andis the kernel or the underlying driver connected? Today, we summarize some of my own rough understandings as follows.Having learned about driver development under Linux, most of the basic drive operations include 3 important kernel data structures, called file_operations,file, and Ino

The implementation of a system call differs greatly from the implementation of a general procedure call. For system calls, the control is converted from the original user state to the system state, which is accomplished by means of interrupt and falling into the mechanism, including interruption and falling into the hardware mechanism and interrupt and sink into the processing program in two parts. Interrupt and sink into a hardware organization The

In September, Shenzhen website analysis and sharing activities, a friend asked the customer calls tracking content, at that time I made some simple answer, but the answer is not very systematic. Use this article to make some deep sharing with you. Google Analytics is currently not able to track the offline activity data, so, the successful implementation of the user call tracking scheme requires the Web analytics tools and a number of third-party ser

http://zyg345646335.iteye.com/blog/2208899 Catalog Overview Rest Benefits Scenario QuickStart Standard Java Rest api:jax-rs Introduction Rest service provides a study of the implementation of the HTTP Post/get annotation in the interface class or implementation of the class JSON, XML and other multi-data grid Supports additional requirements for XML data formats custom serialization configuration Rest server Implementation Get context information Configure Port number and Context Path Configure

. 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

1. What is a system call?The Linux kernel sets up a set of subroutines that are used to implement various system functions, called system calls.　　Linux system calls are provided as part of the C library, and users can invoke them in their own applications through system invoke commands.#include 2, the difference between the system call and the general library functionThe general library function is always r

When the Oracle database is closed, the shutdown immediate is not closed after the command, the alert log is viewed, and the log is prompted after the wait period:Shutdown:waiting for active calls to complete.The reason is that some processes cannot be cleaned by the Pmon process, causing shutdown to shut down while hang live.= = "according to observation, in oracle10g and above version, will be the following tips:Active call for Process 12345 user '

)Define_time (_name,_function,_expires,_data);_name The name of the kernel timer variable you want to defineVoid init_timer (struct timer_list *timer);Modify Timer650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M02/8A/BE/wKiom1g6MEviN7l2AACB4QttqMw102.png-wh_500x0-wm_3 -wmp_4-s_1419104650.png "title=" image 1.png "alt=" Wkiom1g6mevin7l2aacb4qttqmw102.png-wh_50 "/>Init_timer (time) initialize timer, pass address#define Bark_timer 5#deifne Bark_data 100Xxx.expires = jiffies+hz*bark_timer;//

* server_id, const char * user_id, const char * user_name, void * user_obj_param); It's in C #. public struct Sipclient {public string realm;//Authentication code public INTPTR LPVOID;//user parameter public string from_ip;//local IP public int from_port; Local port public string to_ip; SIP server IP public int to_port; SIP server Port public string client_id; The user's encoding public string server_id; The encoding public int reg_id of the SIP server; Reserved, temporarily not used} [DllImpor

In Xiao Ming's second C + +, we see that Xiaoming used the integer, floating-point type and other data types, then these data types in the computer is how to express. Their operation is how to achieve. In addition, the main function calls the area calculation function calculate what exactly happened. After the translation, a high-level language written statements into a lot of independent machine language can not be divided, that is, instructions. How

Reprint: http://blog.csdn.net/ronliu/article/details/6446251The use of function pointer hooks in Linux makes it difficult to read code. For example, if you want to know the invocation path of a function, you can only look at the code with a tool such as source insight. Is there a way to get the overall impression of a call relationship quickly? Ftrace is a debugging tool provided by the kernel that can track what is happening in the kernel. such as function call, process switch, interrupt switch

Reprint: http://blog.csdn.net/ronliu/article/details/6446251The use of function pointer hooks in Linux makes it difficult to read code. For example, if you want to know the invocation path of a function, you can only look at the code with a tool such as source insight. Is there a way to get the overall impression of a call relationship quickly? Ftrace is a debugging tool provided by the kernel that can track what is happening in the kernel. such as function call, process switch, interrupt switch