shared-memory

I want to share array data between two applications. In my mind, first program create the array and the second program can read the array from already allocated memory area. The array is not a dynamic array. I found a way to share pointer using OpenFileMapping and MapViewOfFile . I have no luck to implement array sharing and I think i don't want to use IPC method yet. Is it possible to plan a scheme like this (sharing array)? My purpose is to minimize memory usage and reading data quickly. Cosmin Prund Scratched my head thinking of what a short-but-complete example of sharing memory between

How do I give child processes access to data in shared memory if the data is only available after the child processes have been spawned (using multiprocessing.Process )? I am aware of multiprocessing.sharedctypes.RawArray , but I can't figure out how to give my child processes access to a RawArray that is created after the processes have already started. The data is generated by the parent process, and the amount of data is not known in advance. If not for the GIL I'd be using threading instead which will make this task a little simpler. Using a non-CPython implementation is not an option.

I'm currently using shared memory for IPC between Java and C++ apps, but looking for a more convenient alternative. Can someone advise a better method with same performance and speed? Thanks! mikelong It depends on how you plan to have your apps interact. In the POSIX environment, you have pipes, shared memory, sockets, semaphores and message queues. See this question: Comparing unix linux IPC for more information. What is the interaction model for your processes (i.e. client/server, producer-consumer, etc)? From personal experience, I would suggest your best bet would be pipes (since they are

http://www.php.net/manual/en/intro.shmop.php Shmop is an easy to use set of functions that allows PHP to read, write, create and delete Unix shared memory segments. I don't understand, what exactly is the purpose of this extension? What is it used for? outis Shared memory allows multiple processes to access the same data in memory. You can use it to share data among running PHP scripts. $shm = shmop_open(0xF00, "c", 0644, 4); $count = unpack('L', shmop_read($shm, 0, 4)); $count = reset($count); var_dump($count); echo "count: ", $count++, "<br/>\n"; shmop_write($shm, pack('L', $count), 0); When

I'm in Linux 2.6. I have an environment where 2 processes simulate (using shared memory) the exchange of data through a simple implementation of the message passing mode. I have a client process (forked from the parent, which is the server) which writes a struct(message) to a memory mapped region created (after the fork) with: message *m = mmap(NULL, sizeof(message), PROT_READ|PROT_WRITE, MAP_SHARED|MAP_ANONYMOUS, -1, 0) This pointer is then written to a queue (in form of a linked list) into another shared memory area which is common to server and client process (because if was created prior

My aim is to pass data from a C++ process to a Java process and then to receive a result back. I have achieved this via a named pipe but I would prefer to share the data rather than passing or copying it, assuming the access would be faster. Initially, I thought of creating a shared segment in C++ that I could write to and read with Java, but I'm not sure if this is possible via JNI, let alone safe. I believe it's possible in Java to allocate the memory using ByteBuffer.allocateDirect and then use GetDirectBufferAddress to access the address in C++, but if I'm correct this is for native calls