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/* ========================================================================== HTML5 display definitions ========================================================================== */
/** Correct `block` display not defined in IE 8/9. */
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/** Address `[hidden]` styling not present in IE 8/9. Hide the `template` element in IE, Safari, and Firefox < 22. */
[hidden], template { display: none; }
script { display: none !important; }
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/** 1. Set default font family to sans-serif. 2. Prevent iOS text size adjust after orientation change, without disabling user zoom. */
html { font-family: sans-serif; /* 1 */ -ms-text-size-adjust: 100%; /* 2 */ -webkit-text-size-adjust: 100%; /* 2 */ }
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/** Address differences between Firefox and other browsers. */
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/** Address margin not present in IE 8/9 and Safari 5. */
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/** 1. Correct `color` not being inherited in IE 8/9. 2. Remove padding so people aren't caught out if they zero out fieldsets. */
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/** 1. Correct font family not being inherited in all browsers. 2. Correct font size not being inherited in all browsers. 3. Address margins set differently in Firefox 4+, Safari 5, and Chrome. */
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/** Address Firefox 4+ setting `line-height` on `input` using `!important` in the UA stylesheet. */
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/** Address inconsistent `text-transform` inheritance for `button` and `select`. All other form control elements do not inherit `text-transform` values. Correct `button` style inheritance in Chrome, Safari 5+, and IE 8+. Correct `select` style inheritance in Firefox 4+ and Opera. */
button, select { text-transform: none; }
/** 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio` and `video` controls. 2. Correct inability to style clickable `input` types in iOS. 3. Improve usability and consistency of cursor style between image-type `input` and others. */
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/** 1. Address box sizing set to `content-box` in IE 8/9. 2. Remove excess padding in IE 8/9. */
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/** Remove inner padding and search cancel button in Safari 5 and Chrome on OS X. */
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/** Remove inner padding and border in Firefox 4+. */
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/** Remove most spacing between table cells. */
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#header > h1:first-child + #toc { margin-top: 8px; border-top: 1px solid #dddddd; }
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#header .details span:first-child { margin-left: -0.125em; }
#header .details span.email a { color: #333333; }
#header .details br { display: none; }
#header .details br + span:before { content: "\00a0\2013\00a0"; }
#header .details br + span.author:before { content: "\00a0\22c5\00a0"; color: #333333; }
#header .details br + span#revremark:before { content: "\00a0|\00a0"; }
#header #revnumber { text-transform: capitalize; }
#header #revnumber:after { content: "\00a0"; }
#content > h1:first-child:not([class]) { color: black; border-bottom: 1px solid #dddddd; padding-bottom: 8px; margin-top: 0; padding-top: 1rem; margin-bottom: 1.25rem; }
#toc { border-bottom: 0 solid #dddddd; padding-bottom: 0.5em; }
#toc > ul { margin-left: 0.125em; }
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#toc li { line-height: 1.3334; margin-top: 0.3334em; }
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#toctitle { color: black; font-size: 1.2em; }
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body.toc2 { padding-left: 15em; padding-right: 0; }
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#toc.toc2 #toctitle { font-size: 1.375em; }
#toc.toc2 > ul { font-size: 0.95em; }
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body.toc2.toc-right { padding-left: 0; padding-right: 20em; } }
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#content #toc > :last-child { margin-bottom: 0; }
#footer { max-width: 100%; background-color: none; padding: 1.25em; }
#footer-text { color: black; line-height: 1.44; }
#content { margin-bottom: 0.625em; }
.sect1 { padding-bottom: 0.625em; }
@media only screen and (min-width: 768px) { #content { margin-bottom: 1.25em; }
.sect1 { padding-bottom: 1.25em; } }
.sect1:last-child { padding-bottom: 0; }
.sect1 + .sect1 { border-top: 0 solid #dddddd; }
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#content h1 > a.anchor:before, h2 > a.anchor:before, h3 > a.anchor:before, #toctitle > a.anchor:before, .sidebarblock > .content > .title > a.anchor:before, h4 > a.anchor:before, h5 > a.anchor:before, h6 > a.anchor:before { content: "\00A7"; font-size: 0.85em; display: block; padding-top: 0.1em; }
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#content h1 > a.link, h2 > a.link, h3 > a.link, #toctitle > a.link, .sidebarblock > .content > .title > a.link, h4 > a.link, h5 > a.link, h6 > a.link { color: black; text-decoration: none; }
#content h1 > a.link:hover, h2 > a.link:hover, h3 > a.link:hover, #toctitle > a.link:hover, .sidebarblock > .content > .title > a.link:hover, h4 > a.link:hover, h5 > a.link:hover, h6 > a.link:hover { color: black; }
.audioblock, .imageblock, .literalblock, .listingblock, .stemblock, .videoblock { margin-bottom: 1.25em; }
.admonitionblock td.content > .title, .audioblock > .title, .exampleblock > .title, .imageblock > .title, .listingblock > .title, .literalblock > .title, .stemblock > .title, .openblock > .title, .paragraph > .title, .quoteblock > .title, table.tableblock > .title, .verseblock > .title, .videoblock > .title, .dlist > .title, .olist > .title, .ulist > .title, .qlist > .title, .hdlist > .title { text-rendering: optimizeLegibility; text-align: left; }
table.tableblock > caption.title { white-space: nowrap; overflow: visible; max-width: 0; }
.paragraph.lead > p, #preamble > .sectionbody > .paragraph:first-of-type p { color: black; }
table.tableblock #preamble > .sectionbody > .paragraph:first-of-type p { font-size: inherit; }
.admonitionblock > table { border-collapse: separate; border: 0; background: none; width: 100%; }
.admonitionblock > table td.icon { text-align: center; width: 80px; }
.admonitionblock > table td.icon img { max-width: initial; }
.admonitionblock > table td.icon .title { font-weight: bold; font-family: Noto, sans-serif; text-transform: uppercase; }
.admonitionblock > table td.content { padding-left: 1.125em; padding-right: 1.25em; border-left: 1px solid #dddddd; color: #5e93b8; }
.admonitionblock > table td.content > :last-child > :last-child { margin-bottom: 0; }
.exampleblock > .content { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.exampleblock > .content > :first-child { margin-top: 0; }
.exampleblock > .content > :last-child { margin-bottom: 0; }
.sidebarblock { border-style: solid; border-width: 1px; border-color: #e6e6e6; margin-bottom: 1.25em; padding: 1.25em; background: white; -webkit-border-radius: 0; border-radius: 0; }
.sidebarblock > :first-child { margin-top: 0; }
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<body class="manpage">
<div id="header">
<h1>clSVMAlloc(3) Manual Page</h1>
<h2 id="_name">Name</h2>
<div class="sectionbody">
<p>clSVMAlloc - Allocates a shared virtual memory (SVM) buffer that can be shared by the host and all devices in an OpenCL context that support shared virtual memory.</p>
</div>
</div>
<div id="content">
<div class="sect1">
<h2 id="_c_specification">C Specification</h2>
<div class="sectionbody">
<div class="paragraph">
<p>To allocate a shared virtual memory buffer (referred to as a SVM buffer)
that can be shared by the host and all devices in an OpenCL context that
support shared virtual memory, call the function</p>
</div>
<div id="clSVMAlloc" class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-c++" data-lang="c++">void* clSVMAlloc(
cl_context context,
cl_svm_mem_flags flags,
size_t size,
cl_uint alignment);</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_parameters">Parameters</h2>
<div class="sectionbody">
<div class="ulist">
<ul>
<li>
<p><em>context</em> is a valid OpenCL context used to create the SVM buffer.</p>
</li>
<li>
<p><em>flags</em> is a bit-field that is used to specify allocation and usage
information.
The <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#svm-flags-table">SVM Memory Flags</a> table describes the possible values
for <em>flags</em>.</p>
</li>
<li>
<p><em>size</em> is the size in bytes of the SVM buffer to be allocated.</p>
</li>
<li>
<p><em>alignment</em> is the minimum alignment in bytes that is required for the newly
created buffers memory region.
It must be a power of two up to the largest data type supported by the
OpenCL device.
For the full profile, the largest data type is long16.
For the embedded profile, it is long16 if the device supports 64-bit
integers; otherwise it is int16.
If alignment is 0, a default alignment will be used that is equal to the
size of largest data type supported by the OpenCL implementation.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">Description</h2>
<div class="sectionbody">
<table id="svm-flags-table" class="tableblock frame-all grid-all stretch">
<caption class="title">Table 1. List of supported cl_svm_mem_flags_ values</caption>
<colgroup>
<col style="width: 50%;">
<col style="width: 50%;">
</colgroup>
<thead>
<tr>
<th class="tableblock halign-left valign-top"><strong>cl_svm_mem_flags</strong></th>
<th class="tableblock halign-left valign-top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>CL_MEM_READ_WRITE</strong></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the SVM buffer will be read and written by a
kernel.
This is the default.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>CL_MEM_WRITE_ONLY</strong></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the SVM buffer will be written but not read by
a kernel.</p>
<p class="tableblock"> Reading from a SVM buffer created with CL_MEM_WRITE_ONLY inside a kernel
is undefined.</p>
<p class="tableblock"> CL_MEM_READ_WRITE and CL_MEM_WRITE_ONLY are mutually exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>CL_MEM_READ_ONLY</strong></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag specifies that the SVM buffer object is a read-only memory
object when used inside a kernel.</p>
<p class="tableblock"> Writing to a SVM buffer created with CL_MEM_READ_ONLY inside a kernel is
undefined.</p>
<p class="tableblock"> CL_MEM_READ_WRITE or CL_MEM_WRITE_ONLY and CL_MEM_READ_ONLY are mutually
exclusive.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>CL_MEM_SVM_FINE_GRAIN_BUFFER</strong></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This specifies that the application wants the OpenCL implementation to
do a fine-grained allocation.</p></td>
</tr>
<tr>
<td class="tableblock halign-left valign-top"><p class="tableblock"><strong>CL_MEM_SVM_ATOMICS</strong></p></td>
<td class="tableblock halign-left valign-top"><p class="tableblock">This flag is valid only if CL_MEM_SVM_FINE_GRAIN_BUFFER is specified in
flags.
It is used to indicate that SVM atomic operations can control visibility
of memory accesses in this SVM buffer.</p></td>
</tr>
</tbody>
</table>
<div class="paragraph">
<p>If CL_MEM_SVM_FINE_GRAIN_BUFFER is not specified, the buffer can be created
as a coarse grained SVM allocation.
Similarly, if CL_MEM_SVM_ATOMICS is not specified, the buffer can be created
without support for SVM atomic operations (refer to an OpenCL kernel
language specifications).</p>
</div>
<div class="paragraph">
<p>Calling <strong>clSVMAlloc</strong> does not itself provide consistency for the shared
memory region.
When the host cannot use the SVM atomic operations, it must rely on OpenCLs
guaranteed memory consistency at synchronization points.</p>
</div>
<div class="paragraph">
<p>For SVM to be used efficiently, the host and any devices sharing a buffer
containing virtual memory pointers should have the same endianness.
If the context passed to <strong>clSVMAlloc</strong> has devices with mixed endianness and
the OpenCL implementation is unable to implement SVM because of that mixed
endianness, <strong>clSVMAlloc</strong> will fail and return <code>NULL</code>.</p>
</div>
<div class="paragraph">
<p>Although SVM is generally not supported for image objects, <strong>clCreateImage</strong>
may create an image from a buffer (a 1D image from a buffer or a 2D image
from buffer) if the buffer specified in its image description parameter is a
SVM buffer.
Such images have a linear memory representation so their memory can be
shared using SVM.
However, fine grained sharing and atomics are not supported for image reads
and writes in a kernel.</p>
</div>
<div class="paragraph">
<p><strong>clSVMAlloc</strong> returns a valid non-<code>NULL</code> shared virtual memory address if the
SVM buffer is successfully allocated.
Otherwise, like <strong>malloc</strong>, it returns a <code>NULL</code> pointer value.
<strong>clSVMAlloc</strong> will fail if</p>
</div>
<div class="ulist">
<ul>
<li>
<p><em>context</em> is not a valid context.</p>
</li>
<li>
<p><em>flags</em> does not contain CL_MEM_SVM_FINE_GRAIN_BUFFER but does contain
CL_MEM_SVM_ATOMICS.</p>
</li>
<li>
<p>Values specified in <em>flags</em> do not follow rules described for supported
values in the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#svm-flags-table">SVM Memory Flags</a> table.</p>
</li>
<li>
<p>CL_MEM_SVM_FINE_GRAIN_BUFFER or CL_MEM_SVM_ATOMICS is specified in
<em>flags</em> and these are not supported by at least one device in <em>context</em>.</p>
</li>
<li>
<p>The values specified in <em>flags</em> are not valid, i.e. don&#8217;t match those
defined in the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#svm-flags-table">SVM Memory Flags</a> table.</p>
</li>
<li>
<p><em>size</em> is 0 or &gt; CL_DEVICE_MAX_MEM_ALLOC_SIZE value for any device in
<em>context</em>.</p>
</li>
<li>
<p><em>alignment</em> is not a power of two or the OpenCL implementation cannot
support the specified alignment for at least one device in <em>context</em>.</p>
</li>
<li>
<p>There was a failure to allocate resources.</p>
</li>
</ul>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See Also</h2>
<div class="sectionbody">
<div class="paragraph">
<p><a href="cl_context.html">cl_context</a>, <a href="cl_svm_mem_flags.html">cl_svm_mem_flags</a>, <a href="cl_uint.html">cl_uint</a></p>
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<div class="sect1">
<h2 id="_document_notes">Document Notes</h2>
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<p>For more information, see the OpenCL Specification at URL</p>
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<div class="paragraph">
<p><a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#clSVMAlloc" class="bare">https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_API.html#clSVMAlloc</a></p>
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<p>This page is extracted from the OpenCL Specification.
Fixes and changes should be made to the Specification, not directly.</p>
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<h2 id="_copyright">Copyright</h2>
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<p>Copyright (c) 2014-2019 Khronos Group. This work is licensed under a
<a href="http://creativecommons.org/licenses/by/4.0/">Creative Commons
Attribution 4.0 International License</a>.</p>
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