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# Copyright: (C) 2010-2019 Alex Clark and Pillow contributors
# License: PIL Software License
import os
import sys
from distutils.ccompiler import CCompiler
from multiprocessing import Pool, cpu_count
try:
MAX_PROCS = int(os.environ.get("MAX_CONCURRENCY", min(4, cpu_count())))
except NotImplementedError:
MAX_PROCS = None
# hideous monkeypatching. but. but. but.
def _mp_compile_one(tp):
(self, obj, build, cc_args, extra_postargs, pp_opts) = tp
try:
src, ext = build[obj]
except KeyError:
return
self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
return
def _mp_compile(
self,
sources,
output_dir=None,
macros=None,
include_dirs=None,
debug=0,
extra_preargs=None,
extra_postargs=None,
depends=None,
):
"""Compile one or more source files.
see distutils.ccompiler.CCompiler.compile for comments.
"""
# A concrete compiler class can either override this method
# entirely or implement _compile().
macros, objects, extra_postargs, pp_opts, build = self._setup_compile(
output_dir, macros, include_dirs, sources, depends, extra_postargs
)
cc_args = self._get_cc_args(pp_opts, debug, extra_preargs)
pool = Pool(MAX_PROCS)
try:
print("Building using %d processes" % pool._processes)
except Exception:
pass
arr = [(self, obj, build, cc_args, extra_postargs, pp_opts) for obj in objects]
pool.map_async(_mp_compile_one, arr)
pool.close()
pool.join()
# Return *all* object filenames, not just the ones we just built.
return objects
def install():
fl_win = sys.platform.startswith("win")
fl_cygwin = sys.platform.startswith("cygwin")
if fl_win or fl_cygwin:
# Windows barfs on multiprocessing installs
print("Single threaded build for Windows")
return
if MAX_PROCS != 1:
# explicitly don't enable if environment says 1 processor
try:
# bug, only enable if we can make a Pool. see issue #790 and
# https://stackoverflow.com/questions/6033599/oserror-38-errno-38-with-multiprocessing
Pool(2)
CCompiler.compile = _mp_compile
except Exception as msg:
print("Exception installing mp_compile, proceeding without: %s" % msg)
else:
print(
"Single threaded build, not installing mp_compile: %s processes" % MAX_PROCS
)
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