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execute: Use the io python module for output capture.

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This change drops the overhead of capturing the process output. The
io module in Python is similar to the POSIX API for a file read
where a read will return up to the buffer size rather than blocking
until the buffer is full.
This commit is contained in:
Chris Johns 2017-04-25 00:32:53 +10:00
parent 7d3350d0bb
commit 437092487f
1 changed files with 11 additions and 4 deletions
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15
rtemstoolkit/execute.py
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@ -1,6 +1,6 @@
#
# RTEMS Tools Project (http://www.rtems.org/)
# Copyright 2010-2016 Chris Johns (chrisj@rtems.org)
# Copyright 2010-2017 Chris Johns (chrisj@rtems.org)
# All rights reserved.
#
# This file is part of the RTEMS Tools package in 'rtems-tools'.
@ -37,6 +37,7 @@
from __future__ import print_function
import functools
import io
import os
import re
import sys
@ -193,7 +194,11 @@ class execute(object):
line = ''
try:
while True:
data = fh.read(1)
#
# The io module file handling return up to the size passed
# in.
#
data = fh.read(4096)
if len(data) == 0:
break
# str and bytes are the same type in Python2
@ -255,7 +260,8 @@ class execute(object):
stdout_thread = threading.Thread(target = _readthread,
name = '_stdout[%s]' % (name),
args = (self,
proc.stdout,
io.open(proc.stdout.fileno(),
closefd = False),
self.output,
''))
stdout_thread.daemon = True
@ -264,7 +270,8 @@ class execute(object):
stderr_thread = threading.Thread(target = _readthread,
name = '_stderr[%s]' % (name),
args = (self,
proc.stderr,
io.open(proc.stderr.fileno(),
closefd = False),
self.output,
self.error_prefix))
stderr_thread.daemon = True