ipc

问题 I am writing a server which fork()'s off a child process when it accepts a socket connection. As the child communicates with a client, it must send some of that information back to the parent. I am using a pipe to accomplish this. The problem is that when I try to do the parent-child IPC, the parent blocks when reading input from the child. Which means that, even though the children are running concurrently, they can only be processed one-at-a-time because they are all waiting for the parent.

问题 I use a file to communicate between Python and Ruby script. But, we have mmap. So here are my questions. Can I do the same thing (communicate between processes) with mmap? What advantage can mmap give us over physical file? Speedup? What would be the easiest way to communicate between two processes? What would be the fastest way to communicate between two processes? 回答1: one advantage of mmap over physical file is indeed speedup, but anything is going to be faster than a physical file ! the

问题 I'm trying to do inter process communication with stdin and stdout . The Posix function I found is popen , but I failed to write a working sample code. Please help me get this work. <edit1> Do I have to use dup ? I can see some examples found with Google using it. But the Linux manual of dup really does not help me understanding how to use that. </edit1> a.c #include <stdio.h> #include <stdlib.h> #include <string.h> int main(void){ char *s; for(;;){ scanf("%ms",&s); printf("%s\n",s); if(

问题 I have a server and client process both running on the same machine. The client creates a CAO object and uses it for some time (<1s up to hours). It takes a lot of memory so I want to dispose of this object as soon as possible after the client finishes with it. I set InitialLeaseTime and RenewOnCallTime to 10s (0.1s and 15s have the same problem). I can see that for a few minutes, the sponsor's Renweal functon is being called every 10s. After several minutes the client starts doing different

问题 I want to use pipes to talk to the process instances in my pool, but I'm getting an error: Let __p be an instance of Pool(): (master_pipe, worker_pipe) = Pipe() self.__p.apply_async(_worker_task, (handler_info, context_info, worker_pipe)) When I execute this, I get the following error [for every instance, obviously]: File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/queues.py", line 376, in get task = get() File "/System/Library/Frameworks/Python

问题 In order to achieve better encapsulation and modularity I've decided to split my kernel driver into 2 (can be more) modules where each is responsible for different functionality. However, there are still some data+logic which I'd like to share between those modules (i.e. one module can manage the communication with user-space, while the other uses it as mediator) and I wonder if there's any easy way to do so. For example, I'd like to publish some API from one module to another, which is

问题 I want to separate modules of my program to communicate with each other. They could be on the same computer, but possibly on different ones. I was considering 2 methods: create a class with all details. Send it of to the communication layer. This one serializes it, sends it, the other side deserializes it back to the class and than handles it further. Create a hashtable (key/value thing). Put all data in it. Send it of to the communicationlayer etc etc So it boils down to hashtable vs class.

问题 I am trying to write a small internal tool to use for debugging focus problems in Swing applications. Right now the debugger tool is built in to the app and enabled via a debug command-line argument. What I'd love to do is have a separate, standalone Java application that can connect to another JVM and listen for certain events (in this case, PropertyChangeEvents on the KeyboardFocusManager). Ideally, it should be able to do this without any changes to the application being debugged, so it

问题 My list view contains 3 columns Name, address and phone number. I want to retrieve an index for a particular name. I'm using ListView_FindItem macro to find the index number but when my code comes to this line it crashes the program. It just says Payroll has stopped working. Windows can check online for a solution to the problem. I'm sure I have passed right handle to the ListView_FindItem macro but I'm not sure about the LVFINDINFO structure. Here's my code WCHAR szProcess[80] = {0};

问题 TL;DR: How can I spawn a different python interpreter (from within python) and create a communication channel between the parent and child when stdin/stdout are unavailable? I would like my python script to execute a modified python interpreter and through some kind of IPC such as multiprocessing.Pipe communicate with the script that interpreter runs. Lets say I've got something similar to the following: subprocess.Popen(args=["/my_modified_python_interpreter.exe", "--my_additional_flag", "my