ipc

问题 Among the following list of IPC options, which could perform multicast (i.e. 1 sender and multiple receivers): signals half duplex pipe named pipe system V message queue unix domain socket Edit memory mapped files From my understanding, it might be possible with named pipe (not sure). 回答1: There's nothing as conceptually flexible as multicast, but with a few limitations some of the facilities might do what you want. Signals may be delivered to a process group. The other IPC mechanisms you

问题 Since a few days i'm trying to get the following thing to work: I have a tiny C++ program which reads some data continuously from a serial port. This data is stored in shared memory like this: HANDLE hMapFile; hMapFile = CreateFileMapping( INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, 10, NULL); LPCTSTR pBuf; pBuf = (LPTSTR) MapViewOfFileEx( hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, 10, NULL); while(true) { //... some code ... CopyMemory((PVOID)pBuf, szMsg, (_tcslen(szMsg) * sizeof(TCHAR))); //..

问题 We have one program in Java and one in Python, and need to get them taking together in a ping-pong manner, each time exchanging an integer array of length 100,000, and taking ~ 0.1 - 1 second to do their work: Java does some work and fires an int array of length 100,000 over to ... Python , which does some work and fires a new array of length 100,000 back to ... Java , which does some work ... etc Note that Each program needs to wait for the other to do it's part. They will run on the same

问题 What would be the fastest portable bi-directional communication mechanism for inter-process communication where threads from one application need to communicate to multiple threads in another application on the same computer, and the communicating threads can be on different physical CPUs). I assume that it would involve a shared memory and a circular buffer and shared synchronization mechanisms. But shared mutexes are very expensive (and there are limited number of them too) to synchronize

问题 I have multiple instances of the same application running. The user ask can click "Quit" on each instance to shut it down. I would like to add the choice to "Quit All Instances", which will raise some kid of "event" that notifies all instances of the application that they should close. I don't need to transport any data along with this event. What's the best (and preferably simplest) way to do this in Windows using C#/.NET? 回答1: Send the good'ol WM_CLOSE to all instances... Process[]

问题 I've started playing with mmap. I'm trying to create an example workspace that will be then extended to the real case. This is what I want to achieve: PROCESS 1: mmap a file (actually a device, but it's okay to generate an example with a text file) PROCESS 2: (not foked from process 1; just an independent process) read the memory mapped by process 1 change some bits write it to a new file I've read several examples and documentations, but I still didn't find how to achieve this. What I'm

问题 My big-picture problem: I need to send a signal from a Windows 10 desktop app (or a service, really) to a UWP XAML MVVM app on the same OS instance / machine. I was using named semaphores in the global namespace, but these don't work at all on UWP (by design, for security reasons maybe). No joy. I tried UWP sockets, and this works with the UWP as listener only if the client is on a remote machine. Is this a security design decision, too? No idea. Exempting the app from loopback restriction

问题 How do I receive receive a signal sent with sigqueue in a c program (on linux)? If just use kill to send a signal I just add a receiver with something like this signal(SIGUSR1, sigusr1); that point to a simple function like this: void sigusr1() { signal(SIGUSR1,sigusr1); printf("SIGUSR1 ....\n"); } But if I send a signal with sigqueue, how would I do then? Thanks Johan Add a sigaction: struct sigaction action; action.sa_flags = SA_SIGINFO; action.sa_sigaction = &sigusr2; if (sigaction(SIGUSR2

问题 I have a situation where I'm starting a process in my code in order to set up an IPC channel. The process I'm starting is an MFC application with no CLR support. The application from which I am starting this process is a C# module in a WPF application (thought I don't think that that is consequential to my problem). This works with a version of the application that does support CLR, and it works on every computer except the deployment target, a touch screen computer with Windows 7. But for

问题 I was trying to implement a client to client communication with a server in between them. The function of the server is that when a client suppose Client A sends a message to the server, the server should forward that message to the other client, Client B. Same way when the Client B sends a message to the server it should be forwarded to Client A. This programs involves only two clients. The error I get when I execute the code is that it says: Socket Operation on Non-socket I get this error