upstream/mercurial-mirror Files · mercurial/thirdparty/concurrent/futures/__init__.py

worker: ability to disable thread unsafe tasks...

worker: ability to disable thread unsafe tasks The worker on Windows is implemented using a thread pool. If worker tasks are not thread safe, badness can occur. In addition, if tasks are executing CPU bound code and holding onto the GIL, there will be non-substantial overhead in Python context switching between active threads. This can result in significant slowdowns of tasks. This commit teaches the code for determining whether to use a worker to take thread safety into account. Effectively, thread unsafe tasks don't use the thread-based worker on Windows. Differential Revision: https://phab.mercurial-scm.org/D3962

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        Gregory Szorc
    
thirdparty: vendor futures 3.2.0...

              r37641
            
      # Copyright 2009 Brian Quinlan. All Rights Reserved.

      # Licensed to PSF under a Contributor Agreement.

      """Execute computations asynchronously using threads or processes."""

        Gregory Szorc
    
futures: switch to absolute and relative imports...

              r37644
            
      from __future__ import absolute_import

        Gregory Szorc
    
thirdparty: vendor futures 3.2.0...

              r37641
            
      __author__ = 'Brian Quinlan (brian@sweetapp.com)'

        Gregory Szorc
    
futures: switch to absolute and relative imports...

              r37644
            
      from ._base import (

          FIRST_COMPLETED,

          FIRST_EXCEPTION,

          ALL_COMPLETED,

          CancelledError,

          TimeoutError,

          Future,

          Executor,

          wait,

          as_completed,

      )

      from .thread import ThreadPoolExecutor

        Gregory Szorc
    
thirdparty: vendor futures 3.2.0...

              r37641
            
      try:

        Gregory Szorc
    
futures: switch to absolute and relative imports...

              r37644
            
          from .process import ProcessPoolExecutor

        Gregory Szorc
    
thirdparty: vendor futures 3.2.0...

              r37641
            
      except ImportError:

          # some platforms don't have multiprocessing

          pass

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Gregory Szorc thirdparty: vendor futures 3.2.0...	r37641	# Copyright 2009 Brian Quinlan. All Rights Reserved.
		# Licensed to PSF under a Contributor Agreement.

		"""Execute computations asynchronously using threads or processes."""

Gregory Szorc futures: switch to absolute and relative imports...	r37644	from __future__ import absolute_import

Gregory Szorc thirdparty: vendor futures 3.2.0...	r37641	__author__ = 'Brian Quinlan (brian@sweetapp.com)'

Gregory Szorc futures: switch to absolute and relative imports...	r37644	from ._base import (
		FIRST_COMPLETED,
		FIRST_EXCEPTION,
		ALL_COMPLETED,
		CancelledError,
		TimeoutError,
		Future,
		Executor,
		wait,
		as_completed,
		)
		from .thread import ThreadPoolExecutor
Gregory Szorc thirdparty: vendor futures 3.2.0...	r37641
		try:
Gregory Szorc futures: switch to absolute and relative imports...	r37644	from .process import ProcessPoolExecutor
Gregory Szorc thirdparty: vendor futures 3.2.0...	r37641	except ImportError:
		# some platforms don't have multiprocessing
		pass