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Strawman proposal for a flexible primitive to wait for one of a set of Futures.

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Guido van Rossum 2012-12-18 21:40:17 -08:00
parent 2377e8f715
commit 209036b898
1 changed files with 13 additions and 4 deletions
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17
pep-3156.txt
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@ -536,7 +536,7 @@ Transports have the following public methods:
- ``writelines(iterable)``. Equivalent to:: - ``writelines(iterable)``. Equivalent to::
for data in iterable: for data in iterable:
self.write(data) self.write(data)
- ``write_eof()``. Close the writing end of the connection. - ``write_eof()``. Close the writing end of the connection.
Subsequent calls to ``write()`` are not allowed. Once all buffered Subsequent calls to ``write()`` are not allowed. Once all buffered
@ -838,10 +838,10 @@ Open Issues
caller (likely a transport) must then write code like this:: caller (likely a transport) must then write code like this::
try: try:
res = ev.sock_recv(sock, 8192) res = ev.sock_recv(sock, 8192)
except Future as f: except Future as f:
yield from sch.block_future(f) yield from sch.block_future(f)
res = f.result() res = f.result()
- Do we need a larger vocabulary of operations for combining - Do we need a larger vocabulary of operations for combining
coroutines and/or futures? E.g. in addition to par() we could have coroutines and/or futures? E.g. in addition to par() we could have
@ -852,6 +852,15 @@ Open Issues
syntax). Anyway, I think all of these are easy enough to write syntax). Anyway, I think all of these are easy enough to write
using ``Task``. using ``Task``.
Proposal: ``f = yield from wait_one(fs)`` takes a set of Futures and
sets f to the first of those that is done. (Yes, this requires an
intermediate Future to wait for.) You can then write::
while fs:
f = tulip.wait_one(fs)
fs.remove(f)
<inspect f>
- Task or callback priorities? (I hope not.) - Task or callback priorities? (I hope not.)