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manual/rtio: Update Syncrhonization section following sync() removal

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David Nadlinger 2019-05-14 20:27:06 +01:00
parent 1e01e6b834
commit d4275ea1e0
1 changed files with 11 additions and 3 deletions
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doc/manual/rtio.rst
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@ -235,22 +235,25 @@ Here, ``run()`` calls ``k1()`` which exits leaving the cursor one second after t
}
.. _rtio-handover-synchronization:
Synchronization
---------------
The seamless handover of the timeline (cursor and events) across kernels and experiments implies that a kernel can exit long before the events it has submitted have been executed.
If a previous kernel sets timeline cursor far in the future this effectively locks the system.
When a kernel should wait until all the events on a particular channel have been executed, use the :meth:`artiq.coredevice.ttl.TTLOut.sync` method of a channel:
When a kernel should wait until all the events have been executed, use the :meth:`artiq.coredevice.core.Core.wait_until_mu` with a timestamp after (or at) the last event:
.. wavedrom::
{
"signal": [
{"name": "kernel", "wave": "x3x.|5.|x", "data": ["on()", "sync()"], "node": "..A.....Y"},
{"name": "kernel", "wave": "x3x.|5...|x", "data": ["on()", "wait_until_mu(7000)"], "node": "..A.....Y"},
{"name": "now", "wave": "2..", "data": ["7000"], "node": "..P"},
{},
{},
{"name": "rtio_counter", "wave": "x2x.|..2x", "data": ["2000", "7000"], "node": " ....V"},
{"name": "rtio_counter", "wave": "x2x.|..2x..", "data": ["2000", "7000"], "node": " ....V"},
{"name": "ttl", "wave": "x1", "node": " R", "phase": -6.5}
],
"edge": [
@ -258,6 +261,11 @@ When a kernel should wait until all the events on a particular channel have been
]
}
In many cases, :meth:`~artiq.language.core.now_mu` will return an appropriate timestamp::
self.core.wait_until_mu(now_mu())
RTIO reset
-----------