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b1694cf588
This allows different parts of a program to use different methods for starting processes without interfering with each other.
99 lines
2.9 KiB
Python
99 lines
2.9 KiB
Python
import os
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import msvcrt
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import signal
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import sys
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import _winapi
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from . import context
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from . import spawn
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from . import reduction
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from . import util
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__all__ = ['Popen']
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#
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#
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#
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TERMINATE = 0x10000
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WINEXE = (sys.platform == 'win32' and getattr(sys, 'frozen', False))
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WINSERVICE = sys.executable.lower().endswith("pythonservice.exe")
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#
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# We define a Popen class similar to the one from subprocess, but
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# whose constructor takes a process object as its argument.
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#
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class Popen(object):
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'''
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Start a subprocess to run the code of a process object
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'''
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method = 'spawn'
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def __init__(self, process_obj):
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prep_data = spawn.get_preparation_data(process_obj._name)
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# read end of pipe will be "stolen" by the child process
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# -- see spawn_main() in spawn.py.
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rhandle, whandle = _winapi.CreatePipe(None, 0)
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wfd = msvcrt.open_osfhandle(whandle, 0)
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cmd = spawn.get_command_line(parent_pid=os.getpid(),
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pipe_handle=rhandle)
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cmd = ' '.join('"%s"' % x for x in cmd)
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with open(wfd, 'wb', closefd=True) as to_child:
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# start process
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try:
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hp, ht, pid, tid = _winapi.CreateProcess(
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spawn.get_executable(), cmd,
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None, None, False, 0, None, None, None)
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_winapi.CloseHandle(ht)
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except:
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_winapi.CloseHandle(rhandle)
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raise
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# set attributes of self
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self.pid = pid
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self.returncode = None
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self._handle = hp
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self.sentinel = int(hp)
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util.Finalize(self, _winapi.CloseHandle, (self.sentinel,))
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# send information to child
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context.set_spawning_popen(self)
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try:
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reduction.dump(prep_data, to_child)
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reduction.dump(process_obj, to_child)
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finally:
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context.set_spawning_popen(None)
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def duplicate_for_child(self, handle):
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assert self is context.get_spawning_popen()
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return reduction.duplicate(handle, self.sentinel)
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def wait(self, timeout=None):
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if self.returncode is None:
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if timeout is None:
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msecs = _winapi.INFINITE
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else:
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msecs = max(0, int(timeout * 1000 + 0.5))
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res = _winapi.WaitForSingleObject(int(self._handle), msecs)
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if res == _winapi.WAIT_OBJECT_0:
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code = _winapi.GetExitCodeProcess(self._handle)
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if code == TERMINATE:
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code = -signal.SIGTERM
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self.returncode = code
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return self.returncode
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def poll(self):
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return self.wait(timeout=0)
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def terminate(self):
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if self.returncode is None:
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try:
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_winapi.TerminateProcess(int(self._handle), TERMINATE)
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except OSError:
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if self.wait(timeout=1.0) is None:
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raise
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