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threading_model.md: Improve locks table

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Karol Lewandowski 2025-04-03 13:45:56 +02:00
parent 6aa1133b19
commit 1a425365ff
1 changed files with 17 additions and 13 deletions
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topics/basics/architectural_overview/threading/threading_model.md
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@ -69,26 +69,30 @@ This is implemented with a single application-wide [read-write (RW) lock](https:
If a thread requires accessing a data model, it must acquire one of the locks:
<table>
<table style="both">
<tr>
<td width="33%">Read Lock</td>
<td width="33%">Write Intent Lock</td>
<td width="33%">Write Lock</td>
<td width="16%"></td>
<td width="28%">Read Lock</td>
<td width="28%">Write Intent Lock</td>
<td width="28%">Write Lock</td>
</tr>
<tr>
<td>Allows a thread for reading data.</td>
<td>Allows a thread for reading data and potentially upgrade to the write lock.</td>
<td>Allows a thread for reading and writing data.</td>
<td>Allows for:</td>
<td>Reading data</td>
<td>Reading data and potentially upgrade to the write lock</td>
<td>Reading and writing data</td>
</tr>
<tr>
<td>Can be acquired from any thread concurrently with other read locks and write intent lock.</td>
<td>Can be acquired from any thread concurrently with read locks.</td>
<td>Can be acquired only from EDT concurrently with a write intent lock acquired on EDT.</td>
<td>Can be acquired from:</td>
<td>Any thread concurrently with other read locks and write intent lock</td>
<td>Any thread concurrently with read locks</td>
<td>Only from EDT concurrently with a write intent lock acquired on EDT</td>
</tr>
<tr>
<td>Can't be acquired if a write lock is held on another thread.</td>
<td>Can't be acquired if another write intent lock or write lock is held on another thread.</td>
<td>Can't be acquired if any other lock is held on another thread.</td>
<td>Can't be acquired if:</td>
<td>A write lock is held on another thread</td>
<td>Another write intent lock or write lock is held on another thread</td>
<td>Any other lock is held on another thread</td>
</tr>
</table>