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doc: Update documentation related to pipes

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The pipes implementation has been updated to allow ISRs to both
send and receive data to/from pipes provided the K_NO_WAIT timeout
option is used.

Signed-off-by: Peter Mitsis <peter.mitsis@intel.com>
This commit is contained in:
Peter Mitsis 2022-07-14 22:38:10 -04:00 • committed by Carles Cufí
commit d13a2544f7
2 changed files with 12 additions and 5 deletions
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12
doc/kernel/services/data_passing/pipes.rst
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@ -54,8 +54,9 @@ pended writer to fill the ring buffer.
Flushing does not in practice allocate or use additional buffers.
.. note::
The kernel does NOT allow for an ISR to send or receive data to/from a
pipe or flush even if it does not attempt to wait for space/data.
The kernel does allow for an ISR to flush a pipe from an ISR. It also
allows it to send/receive data to/from one provided it does not attempt
to wait for space/data.
Implementation
**************
@ -219,7 +220,10 @@ Suggested uses
Use a pipe to send streams of data between threads.
.. note::
A pipe can be used to transfer long streams of data if desired. However it is often preferable to send pointers to large data items to avoid copying the data.
A pipe can be used to transfer long streams of data if desired. However it
is often preferable to send pointers to large data items to avoid copying
the data. Copying large data items will negatively impact interrupt latency
as a spinlock is held while copying that data.
Configuration Options
@ -227,7 +231,7 @@ Configuration Options
Related configuration options:
* None.
* CONFIG_PIPES
API Reference
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