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<title>commit_write_pipe</title>
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<div class="refentry">
<a id="id-1"></a>
<div class="titlepage"></div>
<div xmlns="" class="refnamediv">
<a xmlns="http://www.w3.org/1999/xhtml" id="commit_write_pipe"></a>
<h1>commit_write_pipe</h1>
<p>
Indicates that all writes to <code xmlns="http://www.w3.org/1999/xhtml" class="varname">num_packets</code> associated with a reservation are completed.
</p>
</div>
<div class="refsynopsisdiv">
<h2></h2>
<div class="funcsynopsis">
<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
<tr valign="bottom">
<td>
<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
<a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
<strong class="fsfunc">
commit_write_pipe
</strong>
(</code>
<td>write_only pipe gentype  <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">p</var>, </td>
</td>
</tr>
<tr valign="top">
<td> </td>
<td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#reserve_id_t" target="pagedisplay">reserve_id_t</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">reserve_id</var><code>)</code></td>
</tr>
</table>
</div>
</div>
<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
Indicates that all writes to <code class="varname">num_packets</code>
associated with reservation <code class="varname">reserve_id</code> are
completed.
</p>
<p>
We use the generic type name gentype to indicate the built-in
OpenCL C scalar or vector integer or floating-point data types or any user defined type built
from these scalar and vector data types can be used as the type for the arguments to the pipe
functions listed in this section.
The half scalar and vector types can only be used if the
<a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>
extension is supported. The <span class="type">double</span> scalar
and vector types can only be used if double precision is supported.
</p>
<h4><a id="id-1.5.4"></a>General information about pipes</h4>
<p>
A pipe is identified by specifying the <code class="code">pipe</code>
keyword with a type. The data type specifies the
size of each packet in the pipe. The <code class="code">pipe</code>
keyword is a type modifier. When it is applied to
another type <code class="code">T</code>, the result is a pipe type
whose elements (or packets) are of type <code class="code">T</code>. The packet
type <code class="code">T</code> may be any supported OpenCL C scalar
and vector integer or floating-point data types, or
a user-defined type built from these scalar and vector data types.
</p>
<p>
The
<a class="citerefentry" href="qualifiers.html"><span class="citerefentry"><span class="refentrytitle">read_only</span></span></a>
(or <code class="code">__read_only</code>) and
<a class="citerefentry" href="qualifiers.html"><span class="citerefentry"><span class="refentrytitle">write_only</span></span></a>
(or <code class="code">__write_only</code>) qualifiers
must be used with the pipe qualifier when a pipe
is a parameter of a kernel or of a user-defined
function to identify if a pipe can be read from
or written to by a kernel and its callees and
enqueued child kernels. If no qualifier is specified,
<a class="citerefentry" href="qualifiers.html"><span class="citerefentry"><span class="refentrytitle">read_only</span></span></a>
is assumed.
</p>
<p>
A kernel cannot read from and write to the same pipe object. Using the
<a class="citerefentry" href="qualifiers.html"><span class="citerefentry"><span class="refentrytitle">read_write </span></span></a>
(or <code class="code">__read_write</code>) qualifier with the pipe qualifier is a compilation error.
</p>
<p>
The macro <code class="constant">CLK_NULL_RESERVE_ID</code> refers to an invalid reservation ID.
</p>
<p>
NOTE: The
<a class="citerefentry" href="read_pipe.html"><span class="citerefentry"><span class="refentrytitle">read_pipe</span></span></a> and
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a>
functions that take a reservation ID as an argument can
be used to read from or write to a packet index. These built-ins can be used to read from or write
to a packet index one or multiple times. If a packet index that is reserved for writing is not
written to using the
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a>
function, the contents of that packet in the pipe are undefined.
<a class="citerefentry" href="commit_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_read_pipe</span></span></a> and
<a class="citerefentry" href="work_group_commit_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">work_group_commit_read_pipe</span></span></a>
remove the entries reserved for reading from the pipe.
<a class="citerefentry" href="commit_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_write_pipe</span></span></a> and
<a class="citerefentry" href="work_group_commit_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">work_group_commit_write_pipe</span></span></a>
ensures that the entries reserved for writing are all added in-order
as one contiguous set of packets to the pipe.
</p>
<p>
There can only be <code class="constant">CL_DEVICE_PIPE_MAX_ACTIVE_RESERVATIONS</code>
(refer to the list of possible values for <code class="varname">parame_name</code>
for <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>(table 4.3))
reservations active (i.e. reservation IDs that have been reserved
but not committed) per work-item or work-group for a
pipe in a kernel executing on a device.
</p>
<p>
Work-item based reservations made by a work-item are ordered in the pipe as they are ordered in
the program. Reservations made by different work-items that belong to the same work-group
can be ordered using the work-group barrier function. The order of work-item based
reservations that belong to different work-groups is implementation defined.
</p>
<p>
Work-group based reservations made by a work-group are ordered in the pipe as they are ordered
in the program. The order of work-group based reservations by different work-groups is
implementation defined.
</p>
<h4><a id="id-1.5.13"></a>Restrictions</h4>
<p>
Pipes can only be passed as arguments to a function
(including kernel functions). The C
<a class="citerefentry" href="operators.html"><span class="citerefentry"><span class="refentrytitle">operators</span></span></a>
(refer to section 6.3 of the OpenCL 2.0 specification) cannot be used with
variables declared with the <code class="code">pipe</code> qualifier.
</p>
<p>
The <code class="code">pipe</code> qualifier cannot be used with
variables declared inside a kernel, a structure or
union field, a pointer type, an array, global variables
declared in program scope or the return type of a function.
</p>
<p>
The following behavior is undefined:
</p>
<p>
</p>
<div class="itemizedlist">
<ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
A kernel fails to call
<code class="function">reserve_pipe</code>
before calling
<a class="citerefentry" href="read_pipe.html"><span class="citerefentry"><span class="refentrytitle">read_pipe</span></span></a> or
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a> that take a
reservation ID.
</li>
<li class="listitem">
A kernel calls
<a class="citerefentry" href="read_pipe.html"><span class="citerefentry"><span class="refentrytitle">read_pipe</span></span></a>,
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a>,
<a class="citerefentry" href="commit_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_read_pipe</span></span></a> or
<a class="citerefentry" href="commit_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_write_pipe</span></span></a> with
an invalid reservation ID.
</li>
<li class="listitem">
A kernel calls
<a class="citerefentry" href="read_pipe.html"><span class="citerefentry"><span class="refentrytitle">read_pipe</span></span></a> or
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a>
with an valid reservation ID but with an <code class="varname">index</code>
that is not a value from 0 ... <code class="varname">num_packets</code> - 1
specified to the corresponding call to
<code class="function">reserve_pipe</code>.
</li>
<li class="listitem">
A kernel calls
<a class="citerefentry" href="read_pipe.html"><span class="citerefentry"><span class="refentrytitle">read_pipe</span></span></a> or
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a>
with a reservation ID that has already been committed (i.e. a
<a class="citerefentry" href="commit_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_read_pipe</span></span></a> or
<a class="citerefentry" href="commit_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_write_pipe</span></span></a>
with this reservation ID has
already been called).
</li>
<li class="listitem">
A kernel fails to call
<a class="citerefentry" href="commit_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_read_pipe</span></span></a>
for any reservation ID obtained by a prior call
to <a class="citerefentry" href="reserve_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">reserve_read_pipe</span></span></a>.
</li>
<li class="listitem">
A kernel fails to call
<a class="citerefentry" href="commit_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_write_pipe</span></span></a>
for any reservation ID obtained by a prior call
to <a class="citerefentry" href="reserve_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">reserve_write_pipe</span></span></a>.
</li>
<li class="listitem">
The contents of the reserved data packets in the pipe are undefined if the kernel does not
call <a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a>
for all entries that were reserved by the corresponding call to
<code class="function">reserve_pipe</code>.
</li>
<li class="listitem">
Calls to
<a class="citerefentry" href="read_pipe.html"><span class="citerefentry"><span class="refentrytitle">read_pipe</span></span></a>
that takes a reservation ID and
<a class="citerefentry" href="commit_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_read_pipe</span></span></a> or
<a class="citerefentry" href="write_pipe.html"><span class="citerefentry"><span class="refentrytitle">write_pipe</span></span></a> that
takes a reservation ID and
<a class="citerefentry" href="commit_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">commit_write_pipe</span></span></a>
for a given reservation ID must be called
by the same kernel that made the reservation using
<a class="citerefentry" href="reserve_read_pipe.html"><span class="citerefentry"><span class="refentrytitle">reserve_read_pipe</span></span></a> or
<a class="citerefentry" href="reserve_write_pipe.html"><span class="citerefentry"><span class="refentrytitle">reserve_write_pipe</span></span></a>.
The reservation ID cannot be passed to another kernel including
child kernels.
</li>
</ul>
</div>
<p>
</p>
<div class="refsect2">
<a id="example1"></a>
<h3>
Example
</h3>
<p>
In the following example
</p>
<div class="informaltable">
<table class="informaltable" border="0">
<colgroup>
<col align="left" class="col1" />
</colgroup>
<tbody>
<tr>
<td align="left">
kernel void
foo (read_only pipe fooA_t pipeA,
write_only pipe fooB_t pipeB)
{
...
}
</td>
</tr>
</tbody>
</table>
</div>
<p>
<code class="code">pipeA</code> is a read-only pipe object,
and <code class="code">pipeB</code> is a write-only pipe object.
</p>
</div>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="https://www.khronos.org/registry/cl/specs/opencl-2.0-openclc.pdf#namedest=commit_write_pipe" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="pipeFunctions.html"><span class="citerefentry"><span class="refentrytitle">Pipe Functions</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2015 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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