nonblocking

问题 Note: I have a process that writes one line to stdout ("print("hello")) and waits for raw_input. I run this process with p = subprocess.Popen, then call p.stdout.readline()....this blocks indefinitely. I am setting shell=False...Why can I not read that first output? p = subprocess.Popen(cmd, shell=False, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin = subprocess.PIPE) print(p.stdout.readline()) I have seen this thread about non blocking io for subprocess. I am trying to create an

问题 I'm writing a tcp server in c that uses epoll() i/o multiplexing to manage concurrent connections. I want to timeout connections that have been idle for more than an allowed time. So far I keep a last_active time_t variable associated with each connection, which I update to the current time in the event handler. Before doing that, I check if more than the allowed time has ellapsed since last event and if so I terminate the connection. So far so good but it's not really what I want because the

问题 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. 回答1: It has to do

问题 I think I'm in a problem. I have two TCP apps connected to each other which use winsock I/O completion ports to send/receive data (non-blocking sockets). Everything works just fine until there's a data transfer burst. The sender starts sending incorrect/malformed data. I allocate the buffers I'm sending on the stack, and if I understand correctly, that's a wrong to do, because these buffers should remain as I sent them until I get the "write complete" notification from IOCP. Take this for

问题 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

问题 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

问题 What is the difference between the following 2 snippets of verilog code? 1) always@(in) out = #5 in; AND 2) always@(in) out <= #5 in; Considering no other lines are present in the always block, can there be any difference in output? question is in reference to slide 16 (see o5 and o6 outputs) http://www.sutherland-hdl.com/papers/1996-CUG-presentation_nonblocking_assigns.pdf 回答1: out = #5 in; blocks the next operation for 5 time units. It will prevent the monitoring of the next @(in) until the

问题 Is it possible to schedule a function to execute at every xx millisecs in python,without blocking other events/without using delays/without using sleep ? What is the best way to repeatedly execute a function every x seconds in Python? explains how to do it with sched module, but the solution will block the entire code execution for the wait time(like sleep). The simple scheduling like the one given below is non blocking, but the scheduling works only once- rescheduling is not possible. from

问题 Short Version: How can I create a Promise<Result> which is completed on a trigger of a callback? Long Version: I am working on an application which deals with third-party SOAP services. A request from user delegates to multiple SOAP services simultaneously, aggregates the results and sends back to the user. The system needs to be scalable and should allow multiple concurrent users. As each user requests ends up triggering about 10 web service calls and each call blocking for about 1 second,

问题 Short Version: How can I create a Promise<Result> which is completed on a trigger of a callback? Long Version: I am working on an application which deals with third-party SOAP services. A request from user delegates to multiple SOAP services simultaneously, aggregates the results and sends back to the user. The system needs to be scalable and should allow multiple concurrent users. As each user requests ends up triggering about 10 web service calls and each call blocking for about 1 second,