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condition object to control the potential lock object.Wait () methodEquivalent to Cond_wait ()Notify_all ()Quite with Cond_broadcast ()Nofify ()Similar to the Notify_all () feature, but only wakes up a waiting thread, not allThreading. Semaphore ObjectSemaphore, which is the count lock. When creating an object, you can pass an integer as the upper limit of the count (Sema = threading. Semaphore (5)).It is similar to lock and has two methods for lock.Threading. Event ObjectWith threading. The co

);} } int main (int argc, char* argv[]) { handle_connections ();}It's very simple, and it's self-explaining. I leave the asynchronous UDP client and the server to the reader as an exercise.Summarize the applications that we have written to finish, and ultimately let Boost.asio work. Echo App is a great tool to start learning a library. You can often learn and run the code shown in this section so that you can easily remember the base of the library. In the next chapter, we'll build more

installation scriptImportant: Pull the installation script in the "~/" directory where the account is running .# 安装或升级gityum install git -y# 拉取安装脚本,注意脚本的保存目录cd ~git clone https://github.com/Netonline2016/k8s-ansible.git4. Download the installation packageIn order to avoid the installation process, the network download installation package time-out or wait too long, download the appropriate packages in advance, and placed in the corresponding path, this process has been organized into shell scri

exact matchTake a look at the following example (using the module we completed together previously Hello World ): location/poechant {Hello_world no1;} Location =/poechant {Hello_world no2;} If our request is http://my.domian/poechant , we found two location is matched to the requested URI, and according to our priority order, the first is an empty match when the exact match is matched, the second equals the match, so the second priority is high, which is the output: hello_world, no2It also i

wildcard character?? Extends E? Super E(5) Where do we use it?is used in the collection.3: Enhanced for loop (master)(1) is a For loop(2) formatFor (the element's data type variable name: An array or an object of the collection collection) {With this variable, the variable is actually the element in the set of number of members}(3) BenefitsSimplifies the traversal of arrays and collections(4) DisadvantagesThe target of the enhanced for loop cannot be nu11, and it is recommended to determine whe

? The entry for Spring MVC is the Servlet, and Struts2 is the Filter? Spring MVC will be slightly faster than Struts2. Spring MVC is based on method design, and Sturts2 is class-based, and each time a request is made, an Action is instantiated.? Spring MVC is more concise and development efficient spring MVC is really higher than struts2: Support JSR303, the request to process Ajax is more convenient, only need to use annotations to complete? Struts2 's OGNL expression makes page development mor

array, releasing only one object delete instead of delete[] do not speak auto_ptr objects are stored in a container. Replication and assignment of Auto_ptr objects is destructive. After the Auto_ptr object is copied (or assigned), the original Auto_ptr object does not point to the object and the new Auto_ptr object (left operand) has the underlying object. 12 If the function is tangible as throw () description of the exception: do not throw any exceptions if there is no exception description: C

Today, when dealing with a MAC address, a problem that has not been noticed before is documented. When the string format output is needed, the Format function is automatically thought of, and the MAC address needs to be output in two-bit width 16, so I write%x directly, but I get an error output format in the actual output: • " Fffffff0 ", it should be f0 ah. First of all to determine their own program is not wrong, and then simple analysis, as long

java.lang.NumberFormatException:For Input string: "2013-01-03 15:16:21" Java.lang.NumberFormatException.forInputString (numberformatexception.java:48) Java.lang.Long.parseLong ( long.java:412) Java.lang.Long.parseLong (long.java:461) Jsp_entity.login.execute (login.java:93) sun.reflect.Nat Ivemethodaccessorimpl.invoke0 (Native method) Sun.reflect.NativeMethodAccessorImpl.invoke ( nativemethodaccessorimpl.java:39) Sun.reflect.DelegatingMethodAcc

Scala Learning (16)-Closures and Corrie The following are examples of closures and Gerty: The function can still call object main{ def main (args:array[string]) { //closure def mulby (factor:double) = (x:d) When the variable is not in scope ouble) => x * Factor var a = Mulby (3) var b = Mulby (0.5) println (A (2) + B (9)) println ("==========") //currying Corrie //Converts two functions

*) 0x50000020)//Type: char* #define URXH0 (* (volatile unsigned char *) 0x50000024 )#define UBRDIV0 (* (volatile unsigned int *) 0x50000028)#define Baud_rate 115200 void Uart_init (void) {Gphcon = 0x000000a0;Gphup = 0x000007ff;ULCON0 = (0x03); 8N1UCON0 = (0x01UFCON0 = 0;UMCON0 = 0;UBRDIV0 = (int) ((50*1000*1000)/(BAUD_RATE*16))-1;} unsigned char uart_getc (void){while (!) ( UTRSTAT0 0x01));Return (URXH0 0xff);} void Uart_putc (char c){while (!) ( U

Dynamically allocating memoryMemory Alloc mallocThe 1.malloc C library function internally encapsulates the BRK.2.int brk (void *addr); Linux Structure:AppLibrary LibApiOSHard Due to alignment, memory may be allocated in multiples of 4int *p;P=malloc (4); 4 bytesvoid free (VOID*PTR);//release, and malloc correspond to PTR as the address of the block of application memory, which cannot be known to execute unsuccessfully. #include #include int main (){Int*p;Char buf[32];p= (int*) malloc (sizeof (i

char tmp_bff[12] = ""; Hexadecimal decimal unsigned char hex[4] = {0x34, 0xFE, 0x3e, 0xFF}; unsigned long dec_hex = 0; Dec_hex = Hextodec (hex, 4); printf ("Dec_hex =%d\n", Dec_hex); Decimal turn hexadecimal Dectohex (Dec_hex, TMP_BFF, 4); for (i=0; i{ printf ("tmp_bff[%d] = 0x%02x\n", I, tmp_bff[i]); } BCD transcoding Decimal unsigned long DEC_BCD = 0; unsigned char bcd[4] = {0x98, 0x23, 0x45, 0x78}; DEC_BCD = Bcdtodec (BCD, 4); printf ("DEC_BCD =%d\n", DEC_BCD); Decimal Conversio

JavaScript GC. Frees up the memory space occupied by that local variable, but now that is still in use and not recycled because Getnamefunc is the parent function of this anonymous function, When the Getnamefunc function is called, the anonymous function is returned and assigned to a global variable RETFN, which causes the anonymous function to always be in memory, while the presence of the anonymous function relies on the GETNAMEFUNC function, so the GETNAMEFUNC function is always in memory, i

Write a simple INSERT statement in SQL Server and submit: INSERT into EMP (empno,ename) VALUES (2, ' Dan '); Commit Result Error: Message 3902, Level 16, State 1, row 3rd COMMIT TRANSACTION request does not have a corresponding BEGIN TRANSACTION. The reason for the error: It is true to write this in Oracle, but this SQL Server environment. Grammar needs to change. Solution: It should be written like this: BEGIN TRANSACTION;INSERT into EMP (emp

http://blog.csdn.net/thl789/article/details/7506133Https://zhuanlan.zhihu.com/p/23654187?refer=dreawerHttp://www.ruanyifeng.com/blog/2007/10/ascii_unicode_and_utf-8.html UTF-8UTF-8 (8-bit Unicode Transformation Format) is a variable-length character encoding for Unicode that encodes each character with one to four bytes:128 ASCII characters with a Unicode range of u+0000..u+007f need only one byte encoding;A Unicode range of u+0080..u+07ff characters requires two byte encodings;A Unicode range

not used Warning Reason: The value of the participating operation is not useful. Like you do: Char* p; *p++; This has no effect on p at all. workaround : Make sure what you want to do with the operation. Type 12:showing:warning: ' #ifdef ' argument starts with a digit Warning Reason: There is a mistake like #ifdef 0 Solution : It should be #if 0. Type 13:Show:warning:unknown escape sequence ' \ r ' Warning Reason: compiler does not know ' \ R '. workaround : A clerical error should b

JS Common function Update 2008-8-16 from the network function $ (ID) {return document.getElementById (ID);} /**************Function: GetelementsbyclassnameHow to use:Gets the hyperlink class within the document "Info-links".Getelementsbyclassname (document, "A", "info-links");The class that gets the div within the container is Col.Getelementsbyclassname (document.getElementById ("container"), "div", "col");Get all the classes within the document to b

was DMOZ refused to be depressed? In the end, what is DMOZ's principle of inclusion? We do not know, but we can analyze the reasons for rejection, improve the good may be included as soon as possible. 16 reasons to be rejected by DMOZ the site being built. (content is complete) website appearance style design plain, rough, page error. No substantive content, functional value. Some types of sites must be original content, such as blog

I am 16 years old today, contact with SEO from September 10 has been four months, can say that the technology of SEO is very dish, write this article plainly, is to want to get more outside the chain, so that the site rankings rise! Hehe, I believe that most of the people posted on the Web site webmaster and I have the same purpose. Have done two garbage stations before, now is the past clouds, no longer exist, at that time, even the most basic knowl