WIP: Add 'expedited' decorator for urgent messages

[ZwFink]

This patch adds the @expedited decorator to enable urgent inter-PE messages to skip the message queue. This patch also lays the groundwork for adding additional entry method options such as priorities.

Example of usage:

from charm4py import charm, Chare, Array, expedited class Test(Chare): """  A chare array to test the element proxy.  """ def __init__(self): self.count = 0 @expedited def say(self, msg): """  Helper method which is called by invoking the element proxy.  This method is expected to be called on only the chare for  which the proxy is created.  """ self.count += 1 print("Say", msg, "called on", self.thisIndex, "on PE", charm.myPe()) if self.count == 2: assert self.thisIndex == (3,) exit() def start(self): proxy = self.thisProxy[3] proxy.say("bye") proxy.say("bye") def main(args): arr_proxy = Array(Test, 6) arr_proxy[0].start() charm.start(main)

[lgtm-com]

This pull request introduces 1 alert when merging d813e1d into 0b9a2be - view on LGTM.com

new alerts:

• 1 for Unused local variable

[lgtm-com]

This pull request introduces 1 alert when merging eae8497 into 0b9a2be - view on LGTM.com

new alerts:

• 1 for Unused local variable