time-wait

问题 What happens, in below scenarios, when a socket in TIME_WAIT receives a segment a) When it receives lost ACK b) When sending node wants to establish another new connection using same src_ip:src_port on the server to same dst_ip:dst_port for which the server already has a TIME_WAIT socket. Will it ignore/drop it, sends a reset or reuse the TIME_WAIT socket? Thanks M 回答1: a) When it receives lost ACK Nothing. b) When sending node wants to establish another new connection using same src_ip:src

问题 When using timed_wait on a boost::condition_variable with a duration, will the wait condition time out after the duration even if the user (or ntp) changes the system time? E.g., boost::posix_time::time_duration wait_duration(0, 0, 1, 0); // 1 sec // ** System time jumps back 15 minutes here. ** if( !signal.timed_wait(lock, wait_duration) ) { // Does this condition happen 1 second later, or about 15 minutes later? } 回答1: As of the date of writing (Nov 2013), if the wall-clock time changes

问题 When using timed_wait on a boost::condition_variable with a duration, will the wait condition time out after the duration even if the user (or ntp) changes the system time? E.g., boost::posix_time::time_duration wait_duration(0, 0, 1, 0); // 1 sec // ** System time jumps back 15 minutes here. ** if( !signal.timed_wait(lock, wait_duration) ) { // Does this condition happen 1 second later, or about 15 minutes later? } 回答1: As of the date of writing (Nov 2013), if the wall-clock time changes

问题 When using timed_wait on a boost::condition_variable with a duration, will the wait condition time out after the duration even if the user (or ntp) changes the system time? E.g., boost::posix_time::time_duration wait_duration(0, 0, 1, 0); // 1 sec // ** System time jumps back 15 minutes here. ** if( !signal.timed_wait(lock, wait_duration) ) { // Does this condition happen 1 second later, or about 15 minutes later? } 回答1: As of the date of writing (Nov 2013), if the wall-clock time changes

问题 I am using scrapy script to load URL using "yield". MyUrl = "www.example.com" request = Request(MyUrl, callback=self.mydetail) yield request def mydetail(self, response): item['Description'] = response.xpath(".//table[@class='list']//text()").extract() return item The URL seems to take minimum 5 seconds to load. So I want Scrapy to wait for some time to load the entire text in item['Description']. I tried "DOWNLOAD_DELAY" in settings.py but no use. 回答1: Make a brief view on firebug or another

问题 I have a Go program that generates a lot of HTTP requests from multiple goroutines. after running for a while, the program spits out an error: connect: cannot assign requested address. When checking with netstat , I get a high number (28229) of connections in TIME_WAIT . The high number of TIME_WAIT sockets happens when I the number of goroutines is 3 and is severe enough to cause a crash when it is 5. I run Ubuntu 14.4 under docker and go version 1.7 This is the Go program. package main

问题 I have a simple C# Windows Service that should respond "OK" to GET requests on port 8080. Everything works fine, with one simple itch... Every single request made to the service stays in TIME_WAIT. Am I missing something, I've looked around and most samples I've seen on HTTPListeners and Windows Services are doing it in a similar fashion?! private HttpListener _listener; protected override void OnStart(string[] args) { _listener = new HttpListener(); _listener.Prefixes.Add("http://*:8080/");

问题 I am using a server socket in linux and I need to close it and reopen before the time_wait TCP status expires. I set the reuse address option of the server socket before the binding but it still throws a BindException. I also tried this http://meteatamel.wordpress.com/2010/12/01/socket-reuseaddress-property-and-linux/ but it still doesn't work. To open a server socket i use: ServerSocket ss = new ServerSocket(); ss.setReuseAddress(true); ss.bind(new InetSocketAddress(12345)); and to close: ss

问题 I'm trying to make a random wait between 30 minutes to one hour. The code I'm using is supposed to do this, but after the last line of code the script simply stops. Here's the script TAG POS=1 TYPE=INPUT:TEXT ATTR=ID:true-random-integer-generator-min CONTENT=900 TAG POS=1 TYPE=INPUT:TEXT ATTR=ID:true-random-integer-generator-max CONTENT=3600 WAIT SECONDS=1 TAG POS=1 TYPE=SPAN ATTR=ID:true-random-integer-generator-result&&TXT:* EXTRACT=TXT SET !VAR1 {{!EXTRACT}} WAIT SECONDS={{!VAR1}} SET

问题 I have read a TCP and socket programming book. I have a question, The TIME_WAIT state of the TCP should remain 2MSL time period as the book said. But how then a internet explore like application does not have this problem? According to the documentation, it's 4 minutes , but in Internet explore I don't have to wait even 10 seconds to refresh a web page? How this works? I'm confused please explain. 回答1: There are a few possibilities, some of which I've listed below. The first is that not all