sflow rt

1. Origin of SpinlockSpin Lock: An Access Protection lock on a shared resource, which uses a "spin" loop to wait for a mutex to be acquired.在Linux中，有多套spinlock操作接口。但是，实现机制并不相同。根据使用场景，实现机制可能是“自旋“，也可能不是”自旋”方式。这些实现机制的共通特点是：以不产生调度的方式，获取互斥锁。但是，在实时Linux(RtLinux)中，spinlock却是产生调度的。2. Spinlock usespinlock的不产生调度机制决定了用途：1、对共享数据的访问操作时间一定要短。不同系统对实时性要求不同，这个时间要求有差异，应该控制在5us以内。2、spinlock接口性能较高，适用在高频繁使用，但是冲突又少的场景。3、spinlock一般作为系统基础接口，保护共享资源。例如，mutex中含有的基础变量的保护，需要使用spinlock接口。与mutex的差异： mutex是以可产生调度的方式保护共享资源。当一方占

For people who have just come into contact with the operating system, proper nouns such as process/thread can make people feel dizzy, a whole bunch of concepts ... and the domestic professional books often like to get a pile of professional vocabulary to explain, let people look at the moon confused. The author of the identity of the novice to publish their understanding of these concepts, if the wrong place, do not spray ^_^!In the society in which we live we can be seen as a system, and people

The previous two examples show that the thread scheduling is a thread switching by the system "active intervention", in fact, we can also use the initiative to let the CPU use the actual situation. The system function in Rt-thread: Rt_thread_yield () allows the thread that invokes it to temporarily give up the CPU's use, leaving the next highest priority thread to run, but the thread that calls Rt_thread_yield () still holds the ready state. This and

When I used bcp to back up data yesterday, the following error is always prompted and only several large tables can be exported at a time. This made me very strange that I failed to try it several times in a row. 00: 00000: 00053: 2007/07/23 09:07:14. 25 kernel cannot send, host process disconnected: Linux 15871 SUID: 100: 00000: 00056: 2007/07/23 09:07:14. 37 kernel cannot send, host process disconnected: Linux 15875 SUID: 100: 00000: 00058: 2007/07/23 09:07:14. 39 kernel cannot send, host pro

= 0, // thread # ifdef always success, // semaphore # endif # ifdef rt_using_mutex success, // mutex lock # endif # ifdef rt_using_event rt_object_class_event, // event # endif # ifdef rt_using_mailbox rt_object_class_mailbox, // email # endif # ifdef rt_using_messagequeue success, // Message Queue # endif # ifdef rt_using_memheap Memory, // memory heap # endif # ifdef into memory, // memory pool # endif # ifdef rt_using_device rt_object_class_device, // Device Driver # endif kernel, // clock #

Newly installed RedHat 6.0 operating system, in order to save time, selected "Minimize Installation" during installationThe operating system needs to run mysql-5.6.11, in the CMake compile times the following error:--Openssl_library = Openssl_library-notfound--Crypto_library = Crypto_library-notfound--Library mysqlclient depends on OSLIBS-LPTHREAD;M;RT;DLCMake Error:problem with Tar_close (): SuccessCMake Error:problem extracting tar:/opt/software/mys

A simple card-type Word app that you write in your spare time. The thesaurus is a comprehensive English vocabulary of the original, including voice, using card-style design. Offline thesaurus for remembering words anytime, anywhere.Shop: Http://www.windowsphone.com/zh-cn/store/app/%E5%A4%A7%E5%AD%A6%E7%BB%BC%E5%90%88%E8%8B%B1%E8%AF%AD%E8%AF%8D %e6%b1%87/2beffb97-59dc-4d31-b249-b889c5f4bf85?Card-type University integrated English vocabulary (Windows Phone 8.1

Method 1:Httpbaseprotocolfilter filter = new Httpbaseprotocolfilter ();var Cookis = filter. Cookiemanager.getcookies ("http://dy.qq.com/passport/loginSuccess.htm");Method 2:String Internetgetcookieex (string url){UINT sizeInBytes = 0;Gets Capacity Length FirstInternetgetcookieex (URL, null, NULL, ref sizeinbytes, Internet_cookie_httponly, IntPtr.Zero);UINT Buffercapacityinchars = (UINT) Encoding.Unicode.GetMaxCharCount ((int) sizeinbytes);Now get Cookie Datavar cookiedata = new StringBuilder ((i

I have been studying RTOS for a long time. I used to watch the UCOS for a while. I had a simple experience. However, without project support, my continuous learning ability is really limited, once I learned it, I don't know what it is to do. I always advocate learning and using it in depth. Otherwise, what I learned by myself will always be just a bit of a bit. Today, I took out the development board that I sent to my colleagues. I used the NXP lpc1768 chip, and all the peripheral functions wer

Ten, the latter became a real-time operating system for American drones and Swiss solar aircraft, with different uses. Win Tenwith theQNXare irreplaceable operating systems, other operating systems are younger brothers, our "Domestic operating system" is not ranked "number". In fact, qnx Span style= "font-family: Wenquanyi Zen Hei equal width positive black" > real-time operating system built on "microkernel", with linux with android cpu scheduling, process communication,

/**variableimplementationinfinshshell.**copyright (C) 2006-2013,rt-threaddevelopmentteam**this fileispartofRT-Thread (http://www.rt-thread.org) * Maintainer:bernard.xiongThis article is from the "mountain Ask the Boy" blog, please be sure to keep this source http://linpeng.blog.51cto.com/9779987/1685393Rt-thread finsh Source Analysis: FINSH_VAR.C

be seen, at this time the TEST1 thread continues to execute, but we do not know at this time the test1 thread is roughly from where the start of execution, from the final output of the results, Only to know that at this point the test1 thread has not yet executed to the second RT_KPRINTF output statement. The last test1 thread prints the value of the global variable g_tmp again, and its value should be 10001. When the first sentence in the test2 thread is rt_thread_delay (100), the test1 thread

DemoYour Browser does not support the audio element.Source property:1.SRC: Define audio and video playback links2.type: Define audio and video typesHTML Series Tutorial--p param progress RP rt Ruby Script Select Small source

The IPC (Inter-Process Communication) of the rt-thread operating system contains semaphores, mutex locks, events, mailboxes, and message queues. this article focuses on semaphores. 1. Semaphore control block [cpp]/*** Semaphore structure */struct rt_semaphore {struct rt_ipc_object parent;/***

CPU usage is generally a matter of concern to us. Here we use the hook function of the idle thread to count the CPU usage and print it through the serial port.First, we set the hook function in the initialization thread and add many "tasks" to the LED thread to increase the usage and facilitate statistics, then, the CPU usage is printed every one second. The CPU usage is reversed Based on the CPU idle rate. #include As mentioned above, the system's heartbeat clock speed is too fast, which will

Since the release of the Windows RT system, its traditional desktop has been hunted down by all sides. On the one hand, it does not support the use of traditional software, on the other hand, because its icon is too small, very easy to misuse, resulting in the entire system user experience has declined, in fact this point in the Win8 Pro also reflected. Option too small and easy to operate incorrectly The above picture is the original si

The idle thread is a special thread in the system thread that has the lowest priority, and when no other threads in the system can run, the scheduler dispatches to the idle thread. Idle threads are usually a dead loop and are never suspended. The Rt-thread real-time operating system provides a hook function for idle threads (a hook function: a user-supplied piece of code that sets a hook on a path running on the system, and when the system passes this

This article mainly introduces the jquery function $ under javasrt RT. post execution does not respond to the solution. If you need a friend, you can refer to the javascirpt program in the compilation process, use $. the post method sends data. If the data contains characters ' The Code is as follows: Var jsonstr = '{"value": "abcd $. Post ( Url, {"Jsonstr": jsonstr }, Function (data, status ){ }); You need to escape it before usi

walkthrough, the program modifies the thread's ERROR value to-rt_error in the function that is out of the semaphore.In summary, the program can determine whether a thread is actually getting a semaphore by its error value, that is, if the error value of the thread remains the same as Thread->error==rt_eok, the semaphore is acquired, otherwise it is not fetched or timed out (-rt _etimeout), either illegally separated (-rt_error).。No wait to get semaph

target position of the pawn.The output has q lines, each line contains 1 integers, indicating the minimum time required for each game, and output-1 if a game fails to complete the target.2. SummaryTemporarily not write AC Ah, after a few years again use this problem to try the next Noip in the BFS, a little bit not smooth, directly with four-dimensional marker array to record the state, but will TLE20 points, so only 80 points. Ask how it is AC.3, code (80 points)#include #include#defineMAXN 35