def _reload():
global _reload_attempted
_reload_attempted = True
for fn in _reload_hooks:
fn()
if hasattr(signal, "setitimer"):
# Clear the alarm signal set by
# ioloop.set_blocking_log_threshold so it doesn't fire
# after the exec.
signal.setitimer(signal.ITIMER_REAL, 0, 0)
# sys.path fixes: see comments at top of file. If sys.path[0] is an empty
# string, we were (probably) invoked with -m and the effective path
# is about to change on re-exec. Add the current directory to $PYTHONPATH
# to ensure that the new process sees the same path we did.
path_prefix = '.' + os.pathsep
if (sys.path[0] == '' and
not os.environ.get("PYTHONPATH", "").startswith(path_prefix)):
os.environ["PYTHONPATH"] = (path_prefix +
os.environ.get("PYTHONPATH", ""))
if sys.platform == 'win32':
# os.execv is broken on Windows and can't properly parse command line
# arguments and executable name if they contain whitespaces. subprocess
# fixes that behavior.
subprocess.Popen([sys.executable] + sys.argv)
sys.exit(0)
else:
try:
os.execv(sys.executable, [sys.executable] + sys.argv)
except OSError:
# Mac OS X versions prior to 10.6 do not support execv in
# a process that contains multiple threads. Instead of
# re-executing in the current process, start a new one
# and cause the current process to exit. This isn't
# ideal since the new process is detached from the parent
# terminal and thus cannot easily be killed with ctrl-C,
# but it's better than not being able to autoreload at
# all.
# Unfortunately the errno returned in this case does not
# appear to be consistent, so we can't easily check for
# this error specifically.
os.spawnv(os.P_NOWAIT, sys.executable,
[sys.executable] + sys.argv)
sys.exit(0)
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