Classes | Functions | Variables
tornado::process Namespace Reference

Classes

class  Subprocess

Functions

def _pipe_cloexec
def _reseed_random
def cpu_count
def fork_processes
def task_id

Variables

 _task_id = None
 long = int
 multiprocessing = None

Function Documentation

def tornado.process._pipe_cloexec ( ) [private]

Definition at line 81 of file process.py.

def tornado.process._reseed_random ( ) [private]

Definition at line 67 of file process.py.

Returns the number of processors on this machine.

Definition at line 51 of file process.py.

def tornado.process.fork_processes (   num_processes,
  max_restarts = 100 
)
Starts multiple worker processes.

If ``num_processes`` is None or <= 0, we detect the number of cores
available on this machine and fork that number of child
processes. If ``num_processes`` is given and > 0, we fork that
specific number of sub-processes.

Since we use processes and not threads, there is no shared memory
between any server code.

Note that multiple processes are not compatible with the autoreload
module (or the ``autoreload=True`` option to `tornado.web.Application`
which defaults to True when ``debug=True``).
When using multiple processes, no IOLoops can be created or
referenced until after the call to ``fork_processes``.

In each child process, ``fork_processes`` returns its *task id*, a
number between 0 and ``num_processes``.  Processes that exit
abnormally (due to a signal or non-zero exit status) are restarted
with the same id (up to ``max_restarts`` times).  In the parent
process, ``fork_processes`` returns None if all child processes
have exited normally, but will otherwise only exit by throwing an
exception.

Definition at line 91 of file process.py.

Returns the current task id, if any.

Returns None if this process was not created by `fork_processes`.

Definition at line 175 of file process.py.


Variable Documentation

Definition at line 88 of file process.py.

Definition at line 48 of file process.py.

Definition at line 43 of file process.py.



rosbridge_server
Author(s): Jonathan Mace
autogenerated on Wed Sep 13 2017 03:18:20