multiple-processes | 易学教程

Preventing debugging session from pausing after each inferior exits

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问题 I'm debugging a tree of processes using gdb's very handy multiple-inferior support: (gdb) set detach-on-fork off (gdb) set schedule-multiple on (gdb) set follow-fork-mode parent (gdb) break PostgresMain (gdb) break PostmasterMain and now need to let things run until I hit one of the future breakpoints in some yet to be spawned inferior. However, gdb seems to be "helpfully" pausing whenever an inferior exits normally, or at least blocking cleanup of the inferior so that its parent's wait() can

Cannot run in multiple processes: IOLoop instance has already been initialized. You cannot call IOLoop.instance() before calling start_processes()

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问题 I'm trying to run multiple process in Tornado and I tried the suggestions made on this thread : run multiple tornado processess But the error hasn't gone for me. This is the server file. server.py import os import sys import tornado #import pymongo from tornado import ioloop, web, httpserver, websocket from tornado.options import options #Loading default setting files import settings #Motorengine - ODM for mongodb #from motorengine import connect app = tornado.web.Application(handlers=[ (r'/'

How can multiple calculations be launched in parallel, while stopping them all when the first one returns? [Python]

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问题 How can multiple calculations be launched in parallel, while stopping them all when the first one returns? The application I have in mind is the following: there are multiple ways of calculating a certain value; each method takes a different amount of time depending on the function parameters; by launching calculations in parallel, the fastest calculation would automatically be "selected" each time, and the other calculations would be stopped. Now, there are some " details " that make this

How can multiple calculations be launched in parallel, while stopping them all when the first one returns? [Python]

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How can multiple calculations be launched in parallel, while stopping them all when the first one returns? The application I have in mind is the following: there are multiple ways of calculating a certain value; each method takes a different amount of time depending on the function parameters; by launching calculations in parallel, the fastest calculation would automatically be "selected" each time, and the other calculations would be stopped. Now, there are some " details " that make this question more difficult: The parameters of the function to be calculated include functions (that are

Is using Parcelable the right way to send data between applications?

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问题 I am trying to understand how to communicate between applications in Android - not just between Activity instances. I set up a 'client' that sends a Messenger obj to a Service (in the Intent sent to the service); the service creates a Message obj and sends it back to the 'client' using messenger.send(message) . This works fine until I try to use the Message.obj to hold an object. I created my own Parcelable class MyParcelable in the service and put it into the message. All works until the

Is using Parcelable the right way to send data between applications?

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I am trying to understand how to communicate between applications in Android - not just between Activity instances. I set up a 'client' that sends a Messenger obj to a Service (in the Intent sent to the service); the service creates a Message obj and sends it back to the 'client' using messenger.send(message) . This works fine until I try to use the Message.obj to hold an object. I created my own Parcelable class MyParcelable in the service and put it into the message. All works until the message is unmarshalled in the 'client'. The unmarshall fails because the 'client' has no access to the

IPC (inter process communication) between python and java

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问题 First, a little explanation of why I'm asking this question in the first place: I'm writing a python program (with a wxPython gui) that needs to call a Java AWT program from python and extract data from it. I have an in-process working solution on Windows. I also have an in-process solution on OSX so long as I run the Java app headless. Unfortunately there is no reasonable solution that I have found for running both GUIs within the same process on OSX because both AWT and WX both want the

IPC (inter process communication) between python and java

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First, a little explanation of why I'm asking this question in the first place: I'm writing a python program (with a wxPython gui) that needs to call a Java AWT program from python and extract data from it. I have an in-process working solution on Windows. I also have an in-process solution on OSX so long as I run the Java app headless. Unfortunately there is no reasonable solution that I have found for running both GUIs within the same process on OSX because both AWT and WX both want the first thread and cannot share the wx message loop. What I would like to do is to launch a Java program in