Support for gevent in ptvsd

Currently ptvsd cannot run in a gevent/greenlet script, it just hungs:

from gevent import monkey
monkey.patch_all()
import ptvsd

ptvsd.enable_attach("test", address=('0.0.0.0', 3000))
ptvsd.wait_for_attach()
ptvsd.break_into_debugger()

It would be great if we could debug gevent apps.

[layzerar]

I think this script should work for most users, cheers.

from gevent import monkey
monkey.patch_all()

def setup_ptvsd(host='0.0.0.0', port=5678):
    import sys
    saved_modules = {}
    try:
        green_modules = set([
            'socket', 'ssl', 'select', 'urllib',
            'thread', 'threading', 'time', 'logging',
            'os', 'signal', 'subprocess', 'requests',
        ])
        for modname in list(sys.modules.keys()):
            if modname.partition('.')[0] in green_modules:
                saved_modules[modname] = sys.modules.pop(modname)

        import ptvsd
        ptvsd.enable_attach(address=(host, port), redirect_output=False)
    finally:
        sys.modules.update(saved_modules)

setup_ptvsd()

[cyberw]

I found this: https://github.com/Microsoft/vscode-python/issues/127

Adding "gevent": true to my launch config made it work again! (with the layzerar’s workaround still applied)