interprocess

问题 After happily using open source software for many years I've figured it's time to give back. And since documentation is usually a weak point for many projects, plus my C# skills are not exactly in high demand in my corner of FLOSS land, I've figured I'll start with tutorials, etc. After the second tutorial for a burning tool, I already got annoyed with the routine of take screenshot highlight any important part annotate it add to website repeat and figured I could automate that. I guess what

问题 I'm porting a Windows application to Linux and I have a synchronization problem. In Windows I'm using a system-level named mutex to sync access to a shared memory block. How do I emulate that in Linux? I've created a SystemV semaphore, using semget. The problem is that it is not reentrant, if I already hold it it will block, unlike on Windows. I could add a reference count to it, but then I would need to synchronize access to that, which means another (this time for the current process only)

问题 I want to communicate between different platforms using boost interprocess. I am using vc12 and boost 1.58 on windows 7. My code below is a very simple example, that should work. But it doesn't for communications between diffrent platforms... If I create msm in x64 and open in win32, the process stuck at a lock at function try_based_lock in boost/int/sync/detail/common_algorithms.hpp In the other way around: win32 create, x64 open: the process crashes at name_length in segment_manager_helper

问题 This is a link to an MCVE that demonstrates the deadlock It contains five parts: SharedEvent is an implementation of an AutoResetEvent that is stored in shared memory. CreatedSharedEvent creates a named shared memory object in which a SharedEvent is allocated. It provides an accessor method that returns a reference to the SharedEvent. OpenedSharedEvent opens a named shared memory object in which a SharedEvent has already been allocated. It also provides an accessor method that returns a

问题 In a recent project, I want to debug my program in production use state. The production environment is very complicated so I want to debug the program whenever I find a problem. This is what I want to achieve: whenever I want to debug, I will send a kill signal to the program and hopefully pdb debugger will appear. It is something like this: import pdb import signal import time def handler(signal, frame): pdb.set_trace() signal.signal(signal.SIGTERM, handler) a=1 while True: a+=1 time.sleep(1

问题 I have locked a file using LockFileEx , but I am not able to open a stream from it. HANDLE indexHandle = CreateFile (indexFileName, GENERIC_READ | GENERIC_WRITE, FILE_SHARE_READ, 0, OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0); bool indexLock = false; OVERLAPPED overlapped; memset (&overlapped, 0, sizeof (overlapped)); while (noOfTries >0 && !indexLock) { if (!LockFileEx (indexHandle, LOCKFILE_EXCLUSIVE_LOCK, 0, 0, UINT_MAX, &overlapped)) { InfoLog << "Failed to get lock on index file -- Error code

问题 I have a number of applications running which communicate with each other but none of these applications have their own user interface. I have a system console application which acts as a user interface for the system (i.e. the set of applications which all talk to each other). I would like to be able to use the system console to read and modify the configuration of each of the non-gui apps. Each app has an app.config file created using the Visual Studio Settings GUI. The settings are all in

问题 I am looking for the best way to effectively share chunks of data between two (or more) processes in a writer-biased reader/writer model. My current tests are with boost::interprocess . I have created some managed_shared_memory and am attempting to lock access to the data chunk by using an interprocess mutex stored in the shared memory. However, even when using sharable_lock on the reader and upgradable_lock on the writer, the client will read fragmented values during write operations instead

问题 I'm messing around with some interprocess communication stuff and I am curious if it's possible to copy a function into some shared memory and run it from there from either process. Something like: memcpy(shared_memory_address, &func, &func + sizeof(func)); I realize you can't take the size of the function but that was what popped into my head. 回答1: Theoretically, as functions are just sequence of byte code somewhere in the memory, you could copy the memory block of the function and call

问题 Microsoft played safe here. In their article, "Creating a Child Process with Redirected Input and Output", they are saying: The remaining open handles are cleaned up when this process terminates. To avoid resource leaks in a larger application, close handles explicitly. Which is perfectly useless. What handles? In which process? I want to get my head around it. When a handle is created in parent process with SECURITY_ATTRIBUTES.bInheritHandle = TRUE , a child process can see and use it, and