shared-memory

I am trying to implement a Memory Mapped File within my application (specifically a Windows Service), and then use a C# form to read from MMF the service writes to. Unfortunately i cannot seem to get the form to read anything from the MMF, more importantly it seems that the form never finds the MMF created by the Service. Below are code snippets that outline what im doing, can anyone see what I am doing wrong or be able to point me in a better direction? Service : private MemoryMappedFile mmf = MemoryMappedFile.CreateOrOpen("AuditStream", 1024 * 1024); private Mutex mutex = new Mutex(false,

I've recently been learning Python multiprocessing, and have run into a roadblock. I have a lerge sparse SciPy array (CSC-format), that I need to share in read only format between 5 worker-processes. I've read this and this (numpy-shared), but this seems to be only for dense-types. How would I share a scipy.sparse.csc_matrix() without copying (or with minimal copying) between 5 multiprocessing Process objects? Even the numpy-shared method seems to require copying the entire array, and even then, I can't just convert a scipy.sparse into a mp.Array(). Could anyone help point me in the right

In linux i can get list of opened posix shared memory segments by getting /dev/shm directory listing. How do i programmatically get list of all opened posix shared memory segments in FreeBSD? Assuming segments opened with shm_open and i don't know even a part of a name that was used as a first argument of shm_open. You can't. See the comment in /sys/kern/uipc_shm.c: * TODO: * * (2) Need to export data to a userland tool via a sysctl. Should ipcs(1) * and ipcrm(1) be expanded or should new tools to manage both POSIX * kernel semaphores and POSIX shared memory be written? * * (3) Add support for

I am using ftok() to generate identifiers for shared memory segments used by a C application. I am having problems, where on one box I am getting collisions with the identifiers used by root. I can fix it in this instance by hacking the code, but I would like a more robust solution. The application is installed into its own logical volume, and the path supplied to ftok is the binaries directory for the application (within that lv). The IDs supplied start at 1 and there are usually half a dozen or so. I've tracked down that ftok will do something like this: (id & 0xff) << 24 | (st.st_dev & 0xff

One of Go's slogans is Do not communicate by sharing memory; instead, share memory by communicating . I am wondering whether Go allows two different Go-compiled binaries running on the same machine to communicate with one another (i.e. client-server), and how fast that would be in comparison to boost::interprocess in C++? All the examples I've seen so far only illustrate communication between same-program routines. A simple Go example (with separate client and sever code) would be much appreciated! One of the first things I thought of when I read this was Stackless Python. The channels in Go

I'm attempting to build a python script that has a pool of worker processes (using mutiprocessing.Pool) across a large set of data. I want each process to have a unique object that gets used across multiple executes of that process. Psudo code: def work(data): #connection should be unique per process connection.put(data) print 'work done with connection:', connection if __name__ == '__main__': pPool = Pool() # pool of 4 processes datas = [1..1000] for process in pPool: #this is the part i'm asking about // how do I really do this? process.connection = Connection(conargs) for data in datas: