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nexedi
linux
Commits
5413e24c
Commit
5413e24c
authored
Mar 15, 2016
by
Paul E. McKenney
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documentation: Sharpen up the no-readers quick quiz
Signed-off-by:
Paul E. McKenney
<
paulmck@linux.vnet.ibm.com
>
parent
6146f8df
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Documentation/RCU/Design/Requirements/Requirements.html
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Documentation/RCU/Design/Requirements/Requirements.html
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5413e24c
...
...
@@ -1002,18 +1002,21 @@ obligation to wait for these new readers.
<tr><th>
</th></tr>
<tr><th
align=
"left"
>
Quick Quiz:
</th></tr>
<tr><td>
Suppose that synchronize_rcu() did wait until all readers had completed.
Would the updater be able to rely on this?
Suppose that synchronize_rcu() did wait until
<i>
all
</i>
readers had completed instead of waiting only on
pre-existing readers.
For how long would the updater be able to rely on there
being no readers?
</td></tr>
<tr><th
align=
"left"
>
Answer:
</th></tr>
<tr><td
bgcolor=
"#ffffff"
><font
color=
"ffffff"
>
No
.
For no time at all
.
Even if
<tt>
synchronize_rcu()
</tt>
were to wait until
all readers had completed, a new reader might start immediately after
<tt>
synchronize_rcu()
</tt>
completed.
Therefore, the code following
<tt>
synchronize_rcu()
</tt>
can
not rely on there being no readers
in any case
.
<tt>
synchronize_rcu()
</tt>
can
<i>
never
</i>
rely on there being
no readers
.
</font></td></tr>
<tr><td>
</td></tr>
</table>
...
...
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