nonblocking

How non-blocking API works?

由 烈酒焚心 提交于 2019-12-07 04:38:18
问题 I've been reading Play Framework documentation and found this quote confusing: Note that you may be tempted to therefore wrap your blocking code in Futures. This does not make it non-blocking, it just means the blocking will happen in a different thread. You still need to make sure that the thread pool that you are using has enough threads to handle the blocking. I was under impression that all those non-blocking libs are doing blocking operations in their own thread pools and return Future

Making a Nonblocking socket for WinSocks and *nix

由 不羁的心 提交于 2019-12-07 03:50:42
问题 In C/C++, how would I turn a blocking socket into a non blocking socket in both WinSocks and *nix; so that select() would work correctly. You can use the pre-processor for the platform specific code. 回答1: On linux: fcntl(fd, F_SETFL, O_NONBLOCK); Windows: u_long on = 1; ioctlsocket(fd, FIONBIO, &on); 回答2: select() is supposed to work on blocking sockets. It returns when a read() would return immediately, which is always the case with non-blocking sockets. 来源： https://stackoverflow.com

Why cpu bound is better with blocking I/O and I/O bound is better with non blocking I/O

由 点点圈 提交于 2019-12-07 01:45:33
问题 I have been told that for I/O bound applications, non blocking I/O would be better. For CPU bound applications, blocking I/O is much better. I could not find the reason for such a statement. Tried google, but few articles just touches the topic with not much details. Can someone provide the deep depth reason for it? With this, I want to clear myself with what are the short coming of non blocking I/O as well. After going through another thread here,a reason I could relate was out was if the I

How does node.js implement non-blocking I/O?

由 风格不统一 提交于 2019-12-07 01:03:21
问题 From here i have found that node.js implements non-blocking i/o model. But i don't understand how. As javascript is single threaded. How can a single thread do i/o operations and simultaneously executing the further process. 回答1: It is true that operations such as sleep will be blocking the thread. But I/O events can indeed be asynchronous. Node.js uses an event loop for this. An event loop is “an entity that handles and processes external events and converts them into callback invocations”

Non-blocking thread that runs an external process

由 依然范特西╮ 提交于 2019-12-07 00:53:48
问题 I have created a Java GUI application which functions as a wrapper for many low level external processes. The utility works as is, but is in desperate need of one major improvement. I want my external process run in a non-blocking manner which would permit me to service additional requests in parallel. In a nutshell I want to be able to process data from the external process as the data is being generated. But it appears my basic attempt to check and see if the external process is still

non-blocking udp socket programming in C: what do I get?

由 妖精的绣舞 提交于 2019-12-06 23:11:35
问题 I have a problem in understanding what recv()/recvfrom() return from an non-blockig UDP socket. A bit more specific and compared to TCP (please correct me if I'm wrong): A blocking socket (either TCP or UDP) won't return from a recv() until there is some data in the buffer. This could be some number of bytes (TCP) or a complete datagram (UDP). A non-blocking TCP socket either returns EWOULDBLOCK (linux) / WSAEWOULDBLOCK (windows) or the bytes that are currently in the buffer. As TCP data is a

C /C++ Lock-free (or nonblocking) Ring Buffer that OVERWRITES oldest data?

由 别来无恙 提交于 2019-12-06 22:32:31
问题 I'm trying to find a way to make a Lock Free OR Non-blocking way to make a Ring Buffer for single consumer / single consumer that will over-write the oldest data int the buffer. I've read a lot of lock-free algorithms that work when you "return false" if the buffer is full--ie, don't add; but I can't find even pseudo-code that talks about how to do it when you need to overwrite the oldest data. I am using GCC 4.1.2 (restriction at work, i can't upgrade the version...) and I have the Boost

Verilog blocking/nonblocking assignment in clk generator with self triggered

由 时光毁灭记忆、已成空白 提交于 2019-12-06 16:15:40
Why the following code is not self-triggered? module osc1 (clk); output clk; reg clk; initial #10 clk = 0; always @(clk) #10 clk = ~clk; always begin $monitor("%0d clk=%0d\n",$time,clk); #100 $finish; end endmodule output: # 0 clk=x # 10 clk=0 # 20 clk=1 when used non-blocking assignment it works normally i.e., always @(clk) #10 clk <= ~clk; output: # 0 clk=x # 10 clk=0 # 20 clk=1 # 30 clk=0 # 40 clk=1 # 50 clk=0 # 60 clk=1 # 70 clk=0 # 80 clk=1 # 90 clk=0 thanks in advance. It has to do with the verilog scheduler. @ will wait for a new event, it will ignore any past events. Within the same

Node.js: Object value as stdout of child_process.exec

由 心已入冬 提交于 2019-12-06 15:00:59
I'm new to Node and stumbling on some of the nonblocking elements of it. I'm trying to create a object and have one of the elements of it being a function that returns the stdout of a child_process.exec, like so: var exec = require('child_process').exec; var myObj = {}; myObj.list = function(){ var result; exec("ls -al", function (error, stdout, stderr) { result = stdout; }); return result; } console.log('Ta da : '+myObj.list); I figure that myObj.list is returning result before it is set as stdout , but I can't figure out how to make it wait or do a callback for it. Thanks for your help! You

Non-Blocking i/o in c? (windows)

由 牧云@^-^@ 提交于 2019-12-06 11:34:18
I'm trying to get a non-blocking I/O on a Windows terminal application (windows only, sorry!). What if I want to have a short input time in wich the user can press a button, but if he doesn't the input stops and the program continues? For example: A timer that counts from 1 to whatever that stops when the user presses a certain key: I should have a while loop, but if I do a getch or a getchar function it will stop the program, right? I know I could use kbhit(); , but for the "program" I'm trying to make I need to know the input, not just IF THERE IS input! Are there any simple functions that
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