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Some minor updates to atomic acquire/release docs in LangRef.

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llvm-svn: 138472
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Eli Friedman 2011-08-24 20:28:39 +00:00
parent 43673d6d0b
commit 67b35cbeee
1 changed files with 8 additions and 7 deletions
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@ -1634,14 +1634,15 @@ address is written <code>monotonic</code>ally by one thread, and other threads
eventually see the write. This corresponds to the C++0x/C1x eventually see the write. This corresponds to the C++0x/C1x
<code>memory_order_relaxed</code>.</dd> <code>memory_order_relaxed</code>.</dd>
<dt><code>acquire</code></dt> <dt><code>acquire</code></dt>
<dd>In addition to the guarantees of <code>monotonic</code>, if this operation
reads a value written by a <code>release</code> atomic operation, it
<i>synchronizes-with</i> that operation. This corresponds to the C++0x/C1x
<code>memory_order_acquire</code>.</dd>
<dt><code>release</code></dt>
<dd>In addition to the guarantees of <code>monotonic</code>, <dd>In addition to the guarantees of <code>monotonic</code>,
a <i>synchronizes-with</i> edge may be formed with an <code>acquire</code> a <i>synchronizes-with</i> edge may be formed with a <code>release</code>
operation. This is intended to model C++'s <code>memory_order_release</code>.</dd> operation. This is intended to model C++'s <code>memory_order_acquire</code>.</dd>
<dt><code>release</code></dt>
<dd>In addition to the guarantees of <code>monotonic</code>, if this operation
writes a value which is subsequently read by an <code>acquire</code> operation,
it <i>synchronizes-with</i> that operation. (This isn't a complete
description; see the C++0x definition of a release sequence.) This corresponds
to the C++0x/C1x <code>memory_order_release</code>.</dd>
<dt><code>acq_rel</code> (acquire+release)</dt><dd>Acts as both an <dt><code>acq_rel</code> (acquire+release)</dt><dd>Acts as both an
<code>acquire</code> and <code>release</code> operation on its address. <code>acquire</code> and <code>release</code> operation on its address.
This corresponds to the C++0x/C1x <code>memory_order_acq_rel</code>.</dd> This corresponds to the C++0x/C1x <code>memory_order_acq_rel</code>.</dd>