I’m not sure how the manual can be any clearer! fork() creates a new process, so you now have two identical processes. To distinguish between them, the return value of fork() differs. In the original process, you get the PID of the child process. In the child process, you get 0. So a canonical use … Read more
In general, nothing can be said about the relative order of their execution. Now, let’s consider your specific problem. If: both processes take a non-trivial amount of time to run, and you’re saying that one runs to completion before the other makes any progress, and there are unused CPU cycles, and this happens every time … Read more
First of all, remove that print ‘******…’ line. It just confuses everyone. Instead, let’s try this code… import os import time for i in range(2): print(“I’m about to be a dad!”) time.sleep(5) pid = os.fork() if pid == 0: print(“I’m {}, a newborn that knows to write to the terminal!”.format(os.getpid())) else: print(“I’m the dad of … Read more
Try prepending “nohup” to script.sh. You’ll probably need to decide what to do with stdout and stderr; I just drop it in the example. import os from subprocess import Popen devnull = open(os.devnull, ‘wb’) # Use this in Python < 3.3 # Python >= 3.3 has subprocess.DEVNULL Popen([‘nohup’, ‘script.sh’], stdout=devnull, stderr=devnull)
Yeah you can pull the changes from the original repo into your fork. Add a remote to it ( since origin will be your fork ) and pull. This from GitHub help: First up, add a remote to the original repo. Help here: http://help.github.com/remotes/ Then you can pull in updates to the original repo. Quote … Read more
This answer from a coworker fixed my problem: git checkout -b NEW_BRANCH_NAME LAST_COMMIT_NAME_BEFORE_THE_ONE_WANTED git cherry-pick COMMIT_NAME_WANTED git push origin NEW_BRANCH_NAME Then on GitHub you can do a pull request for the new branch you created. UPDATE I asked and answered this question when I first started working with git. Now that I know more about … Read more
Look at this. Use: set follow-fork-mode <mode> Set the debugger response to a program call of fork or vfork. A call to fork or vfork creates a new process. The <mode> argument can be: parent: The original process is debugged after a fork. The child process runs unimpeded. This is the default. child: The new … Read more
You have to create a pipe from the parent process to the child, using pipe(). Then you must redirect standard ouput (STDOUT_FILENO) and error output (STDERR_FILENO) using dup or dup2 to the pipe, and in the parent process, read from the pipe. It should work. #include <stdio.h> #include <stdlib.h> #include <unistd.h> #define die(e) do { … Read more
So, if you’re not going to release a gem, just go ahead and fork (assuming the license allows it) and don’t worry about it. That’s 100% OK and even expected behavior at this point. Forks are actually one of the easiest ways to accept patches from contributors. The network graph is often a good way … Read more
On Linux, you can use posix_spawn(2) with the POSIX_SPAWN_USEVFORK flag to avoid the overhead of copying page tables when forking from a large process. See Minimizing Memory Usage for Creating Application Subprocesses for a good summary of posix_spawn(2), its advantages and some examples. To take advantage of vfork(2), make sure you #define _GNU_SOURCE before #include … Read more