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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - WTF should have LL/SC and Atomic::transaction should get it for free"
href="https://bugs.webkit.org/show_bug.cgi?id=169300">169300</a>
</td>
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<th>Summary</th>
<td>WTF should have LL/SC and Atomic::transaction should get it for free
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>Product</th>
<td>WebKit
</td>
</tr>
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<th>Version</th>
<td>WebKit Nightly Build
</td>
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<th>Hardware</th>
<td>All
</td>
</tr>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>Normal
</td>
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<th>Priority</th>
<td>P2
</td>
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<th>Component</th>
<td>Web Template Framework
</td>
</tr>
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<th>Assignee</th>
<td>webkit-unassigned@lists.webkit.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>fpizlo@apple.com
</td>
</tr></table>
<p>
<div>
<pre>Patch forthcoming.
So far I've been able to make it so that this code:
lock.transaction(
[&] (LockType& value) -> bool {
value &= ~mask;
if (result.mayHaveMoreThreads)
value |= hasParkedBit;
return true;
});
Emits this code:
0000000000000338 ldaxrb w9, [x8]
000000000000033c and w9, w9, #0xfffffffc
0000000000000340 orr w9, w9, #0x2
0000000000000344 stlxrb w10, w9, [x8]
0000000000000348 tbnz w10, #0x0, 0x338
That's some nice LL/SC code!</pre>
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