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| <title>clCreatePipe</title> |
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| <body> |
| <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="clCreatePipe"></a> |
| <h1> |
| clCreatePipe |
| </h1> |
| <p> |
| Creates a pipe object. |
| </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="abstractDataTypes.html" target="pagedisplay">cl_mem</a> <strong class="fsfunc">clCreatePipe</strong> |
| (</code> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="abstractDataTypes.html" target="pagedisplay">cl_context</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">context</var>, </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#cl_mem_flags" target="pagedisplay">cl_mem_flags</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">pipe_packet_size</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_uint</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">pipe_max_packets</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td>const cl_pipe_properties <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">* properties</var>, </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td><a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">cl_int</a> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">*errcode_ret</var><code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="parameters"></a> |
| <h2>Parameters</h2> |
| <div class="variablelist"> |
| <dl class="variablelist"> |
| <dt> |
| <span class="term"> <code class="varname"> context </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A valid OpenCL context used to create the pipe object. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> flags </code> </span> |
| </dt> |
| <dd> |
| <p> |
| A bit-field that is used to specify |
| allocation and usage information such as the memory |
| arena that should be used to allocate the pipe object and how it |
| will be used. The table below describes |
| the possible values for <code class="varname">flags</code>. |
| Only <code class="constant">CL_MEM_READ_ONLY</code>, |
| <code class="constant">CL_MEM_WRITE_ONLY</code>, <code class="constant">CL_MEM_READ_WRITE</code>, |
| and <code class="constant">CL_MEM_HOST_NO_ACCESS</code> |
| can be specified when creating a pipe object. |
| If value specified for <code class="varname">flags</code> is 0, |
| the default is used which is |
| <code class="constant">CL_MEM_READ_WRITE</code> |
| | <code class="constant">CL_MEM_HOST_NO_ACCESS</code>. |
| </p> |
| <div class="informaltable"> |
| <table class="informaltable" border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">cl_mem_flags</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_READ_WRITE</code> |
| </td> |
| <td align="left"> |
| This flag specifies that the memory object will be read and written by a kernel. This |
| is the default. |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_WRITE_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the memory object will be written but not read by |
| a kernel. |
| </p> |
| |
| <p> |
| Reading from a buffer or image object created with |
| <code class="constant">CL_MEM_WRITE_ONLY</code> inside a kernel is undefined. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_READ_WRITE</code> and <code class="constant">CL_MEM_WRITE_ONLY</code> |
| are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_READ_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the memory object is a read-only memory object when |
| used inside a kernel. |
| </p> |
| |
| <p> |
| Writing to a buffer or image object created with |
| <code class="constant">CL_MEM_READ_ONLY</code> inside a kernel is undefined. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_READ_WRITE</code> or <code class="constant">CL_MEM_WRITE_ONLY</code> |
| and <code class="constant">CL_MEM_READ_ONLY</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_USE_HOST_PTR</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag is valid only if <code class="varname">host_ptr</code> is not NULL. If |
| specified, it indicates that the application wants the OpenCL implementation |
| to use memory referenced by <code class="varname">host_ptr</code> as the storage bits |
| for the memory object. |
| </p> |
| |
| <p> |
| OpenCL implementations are allowed to cache the buffer contents pointed to by |
| <code class="varname">host_ptr</code> in device memory. This cached copy can be used when |
| kernels are executed on a device. |
| </p> |
| |
| <p> |
| The result of OpenCL commands that operate on multiple buffer objects created with |
| the same <code class="varname">host_ptr</code> or overlapping host regions is considered |
| to be undefined. |
| </p> |
| |
| |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the application wants the OpenCL implementation to |
| allocate memory from host accessible memory. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> and |
| <code class="constant">CL_MEM_USE_HOST_PTR</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag is valid only if <code class="varname">host_ptr</code> is not NULL. If specified, |
| it indicates that the application wants the OpenCL implementation to allocate |
| memory for the memory object and copy the data from memory referenced by |
| <code class="varname">host_ptr</code>. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> and |
| <code class="constant">CL_MEM_USE_HOST_PTR</code> are mutually exclusive. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_COPY_HOST_PTR</code> can be used with |
| <code class="constant">CL_MEM_ALLOC_HOST_PTR</code> to initialize the contents of the |
| <span class="type">cl_mem</span> object allocated using host-accessible (e.g. PCIe) memory. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the host will only write to the memory object (using |
| OpenCL APIs that enqueue a write or a map for write). This can be used to optimize |
| write access from the host (e.g. enable write-combined allocations for memory |
| objects for devices that communicate with the host over a system bus such as PCIe). |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the host will only read the memory object (using OpenCL |
| APIs that enqueue a read or a map for read). |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> and |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</code> |
| </td> |
| <td align="left"> |
| <p> |
| This flag specifies that the host will not read or write the memory object. |
| </p> |
| |
| <p> |
| <code class="constant">CL_MEM_HOST_WRITE_ONLY</code> or |
| <code class="constant">CL_MEM_HOST_READ_ONLY</code> and |
| <code class="constant">CL_MEM_HOST_NO_ACCESS</code> are mutually exclusive. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </dd> |
| <dt> |
| <span class="term"> <code class="varname"> pipe_packet_size </code> </span> |
| </dt> |
| <dd> |
| <p> |
| Size in bytes of a pipe packet. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">pipe_max_packets</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Specifies the pipe capacity by specifying the |
| maximum number of packets the pipe can hold. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">properties</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| A list of properties for the pipe and their corresponding values. Each property |
| name is immediately followed by the corresponding desired value. |
| The list is terminated with 0. |
| In OpenCL 2.0, <code class="varname">properties</code> must be NULL. |
| </p> |
| </dd> |
| <dt> |
| <span class="term"> |
| <code class="varname">errcode_ret</code> |
| </span> |
| </dt> |
| <dd> |
| <p> |
| Will return an appropriate error code. If <code class="varname">errcode_ret</code> |
| is NULL, no error code is returned. |
| </p> |
| </dd> |
| </dl> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Notes</h2> |
| <p> |
| Pipes follow the same memory consistency model as |
| defined for buffer and image objects. The |
| pipe state i.e. contents of the pipe across kernel |
| executions (on the same or different devices) is |
| enforced at a synchronization point. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">clCreatePipe</code> returns a valid non-zero pipe object and |
| <code class="varname">errcode_ret</code> is set to <span class="errorname">CL_SUCCESS</span> if the |
| pipe object is created successfully. Otherwise, it returns a NULL value with one of |
| the following error values returned in <code class="varname">errcode_ret</code>: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_CONTEXT</span> if <code class="varname">context</code> is not a valid context. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if values specified in |
| <code class="varname">flags</code> are not as defined above. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_VALUE</span> if <code class="varname">properties</code> is not NULL. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_INVALID_PIPE_SIZE</span> if <code class="varname">pipe_packet_size</code> |
| is 0 or the <code class="varname">pipe_packet_size</code> exceeds |
| <code class="constant">CL_DEVICE_PIPE_MAX_PACKET_SIZE</code> value specified in table 4.3 |
| (see <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>) |
| for all devices in <code class="varname">context</code> or if |
| <code class="varname">pipe_max_packets</code> is 0. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_MEM_OBJECT_ALLOCATION_FAILURE</span> if there is a failure to |
| allocate memory for the pipe object. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_RESOURCES</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the device. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CL_OUT_OF_HOST_MEMORY</span> if there is a failure to allocate |
| resources required by the OpenCL implementation on the host. |
| </li> |
| </ul> |
| </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-2.1.pdf#page=160" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="clCreateBuffer.html"><span class="citerefentry"><span class="refentrytitle">clCreateBuffer</span></span></a>, |
| <a class="citerefentry" href="clCreateImage.html"><span class="citerefentry"><span class="refentrytitle">clCreateImage</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 |
| permit persons to whom the Materials are furnished to do so, subject to |
| the condition that this copyright notice and permission notice shall be included |
| in all copies or substantial portions of the Materials. |
| </div> |
| </div> |
| </body> |
| </html> |
