shared

问题 I have to synchronize N client processes with one server. These processes are forked by a main function in which I declared 3 semaphores. I decided to use POSIX semaphores but I don\'t know how to share them between these processes. I thought that shared memory should work correctly, but I have some questions: How can I allocate the right space of memory in my segment? Can I use sizeof(sem_t) in size_t field of shmget in order to allocate exactly the space I need? Does anyone have some

问题 I have a settings application from which i have to retrieve other applications preferences, but i don\'t have the details of keys in them, how can i retrieve all the available keys and values in that preference? Thanks, Swathi 回答1: Assuming the preference are WORLD_READABLE, this might work: final ArrayList<HashMap<String,String>> LIST = new ArrayList<HashMap<String,String>>(); // where com.example is the owning app containing the preferences Context myContext = createPackageContext("com

问题 I would like to use a numpy array in shared memory for use with the multiprocessing module. The difficulty is using it like a numpy array, and not just as a ctypes array. from multiprocessing import Process, Array import scipy def f(a): a[0] = -a[0] if __name__ == \'__main__\': # Create the array N = int(10) unshared_arr = scipy.rand(N) arr = Array(\'d\', unshared_arr) print \"Originally, the first two elements of arr = %s\"%(arr[:2]) # Create, start, and finish the child processes p =