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| <title>enqueue_kernel</title> |
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| <meta name="keywords" content="enqueue_kernel" /> |
| </head> |
| <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="enqueue_kernel"></a> |
| <h1>enqueue_kernel</h1> |
| <p> |
| Enqueue the block for execution to <code xmlns="http://www.w3.org/1999/xhtml" class="varname">queue</code>. |
| </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">int</a> |
| <strong class="fsfunc"> |
| enqueue_kernel |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">queue_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">queue</var> |
| , </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#kernel_enqueue_flags_t" target="pagedisplay">kernel_enqueue_flags_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">ndrange_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">ndrange</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| ( <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">^block)(void)</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <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">int</a> |
| <strong class="fsfunc"> |
| enqueue_kernel |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">queue_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">queue</var> |
| , </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#kernel_enqueue_flags_t" target="pagedisplay">kernel_enqueue_flags_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">ndrange_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">ndrange</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">uint</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">clk_event_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event_wait_list</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">clk_event_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event_ret</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| ( <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">^block)(void)</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <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">int</a> |
| <strong class="fsfunc"> |
| enqueue_kernel |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">queue_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">queue</var> |
| , </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#kernel_enqueue_flags_t" target="pagedisplay">kernel_enqueue_flags_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">ndrange_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">ndrange</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| ( <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">^block)(local void *, ...)</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">uint</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">size0, ...</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| <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">int</a> |
| <strong class="fsfunc"> |
| enqueue_kernel |
| </strong> |
| (</code> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">queue_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">queue</var> |
| , </td> |
| </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="enums.html#kernel_enqueue_flags_t" target="pagedisplay">kernel_enqueue_flags_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">flags</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">ndrange_t</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">ndrange</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">uint</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">num_events_in_wait_list</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| const <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">clk_event_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event_wait_list</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">clk_event_t</a> |
| * <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">event_ret</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">void</a> |
| ( <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">^block)(local void *, ...)</var> |
| , </td> |
| </tr> |
| <tr valign="top"> |
| <td> </td> |
| <td> |
| <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="scalarDataTypes.html" target="pagedisplay">uint</a> |
| <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">size0, ...</var> |
| <code>)</code></td> |
| </tr> |
| </table> |
| </div> |
| </div> |
| <div class="refsect1"> |
| <a id="description"></a> |
| <h2>Description</h2> |
| <p> |
| Enqueue the block for execution to <code class="varname">queue</code>. |
| If an event is returned, <code class="function">enqueue_kernel</code> |
| performs an implicit retain on the returned event. |
| </p> |
| <p> |
| OpenCL 2.0 allows a kernel to independently enqueue to the same device, without host |
| interaction. A kernel may enqueue code represented by Block syntax, and control execution |
| order with event dependencies including user events and markers. There are several advantages |
| to using the Block syntax: it is more compact; it does not require a |
| <span class="type">cl_kernel</span> object; and |
| enqueuing can be done as a single semantic step. |
| </p> |
| <p> |
| The <code class="function">enqueue_kernel</code> built-in function |
| allows a work-item to enqueue a block. Work-items can |
| enqueue multiple blocks to a device queue(s). |
| </p> |
| <p> |
| The <span class="type">kernel_enqueue_flags_t</span> argument to |
| <code class="function">enqueue_kernel</code> built-in functions can |
| be used to specify when the child kernel begins |
| execution. Supported values are described in the |
| table below. (Implementations are not required to honor this flag. |
| Implementations may not schedule kernel launch earlier than |
| the point specified by this flag, however): |
| </p> |
| <div class="informaltable"> |
| <table border="1"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| <col align="left" class="col2" /> |
| </colgroup> |
| <thead> |
| <tr> |
| <th align="left">kernel_enqueue_flags_t enum</th> |
| <th align="left">Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <code class="constant">CLK_ENQUEUE_FLAGS_NO_WAIT</code> |
| </td> |
| <td align="left"> |
| Indicates that the enqueued kernels |
| do not need to wait for the parent |
| kernel to finish execution before |
| they begin execution. |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CLK_ENQUEUE_FLAGS_WAIT_KERNEL</code> |
| </td> |
| <td align="left"> |
| Indicates that all work-items of the |
| parent kernel must finish executing |
| and all immediate side effects |
| committed before the enqueued |
| child kernel may begin execution. |
| (Immediate meaning not side effects resulting from child kernels. |
| The side effects would include stores to global |
| memory and pipe reads and writes.) |
| </td> |
| </tr> |
| <tr> |
| <td align="left"> |
| <code class="constant">CLK_ENQUEUE_FLAGS_WAIT_WORK_GROUP</code> |
| </td> |
| <td align="left"> |
| Indicates that the enqueued kernels |
| wait only for the workgroup that |
| enqueued the kernels to finish |
| before they begin execution. |
| This acts as a memory synchronization point between |
| work-items in a work-group and child kernels enqueued by |
| work-items in the work-group. |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| NOTE: The <span class="type">kernel_enqueue_flags_t</span> |
| flags are useful when a kernel enqueued from the |
| host and executing on a device enqueues kernels |
| on the device. The kernel enqueued from the |
| host may not have an event associated with it. |
| The <span class="type">kernel_enqueue_flags_t</span> flags allow |
| the developer to indicate when the child |
| kernels can begin execution. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="notes"></a> |
| <h2>Notes</h2> |
| <p> |
| A block passed to <code class="function">enqueue_kernel</code> |
| can have arguments declared to be a pointer to local |
| memory. The <code class="function">enqueue_kernel</code> built-in |
| function variants allow blocks to be enqueued with a |
| variable number of arguments. Each argument must be |
| declared to be a pointer of a data type to |
| local memory. These <code class="function">enqueue_kernel</code> |
| built-in function variants also have a corresponding |
| number of arguments each of type uint that follow |
| the block argument. These arguments |
| specify the size of each local memory pointer |
| argument of the enqueued block. |
| </p> |
| <p> |
| If the |
| <a class="citerefentry" href="cl_khr_device_enqueue_local_arg_types.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_device_enqueue_local_arg_types</span></span></a> |
| extension is enabled, then replace all occurrences of |
| <code class="code">local void *</code> |
| in the table above with |
| <code class="code">local gentype *</code>. |
| We use the generic type name <code class="code">gentype</code> |
| 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 which can be used as the type |
| of the pointee of the arguments of the kernel |
| enqueue functions listed above. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="example1"></a> |
| <h3> |
| Example |
| </h3> |
| <p> |
| Below are some examples of how to enqueue a block. |
| </p> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| kernel void |
| my_func_A(global int *a, global int *b, global int *c) |
| { |
| ... |
| } |
| |
| kernel void |
| my_func_B(global int *a, global int *b, global int *c) |
| { |
| ndrange_t ndrange; |
| // build ndrange information |
| ... |
| |
| // example – enqueue a kernel as a block |
| enqueue_kernel(get_default_queue(), ndrange, |
| ^{my_func_A(a, b, c);}); |
| ... |
| } |
| |
| kernel void |
| my_func_C(global int *a, global int *b, global int *c) |
| { |
| ndrange_t ndrange; |
| // build ndrange information |
| ... |
| |
| // note that a, b and c are variables in scope of |
| // the block |
| void (^my_block_A)(void) = ^{my_func_A(a, b, c);}; |
| |
| // enqueue the block variable |
| enqueue_kernel(get_default_queue(), |
| CLK_ENQUEUE_FLAGS_WAIT_KERNEL, |
| ndrange, |
| my_block_A); |
| ... |
| } |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| The example below shows how to declare a block literal and enqueue it. |
| </p> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| kernel void |
| my_func(global int *a, global int *b) |
| { |
| ndrange_t ndrange; |
| // build ndrange information |
| ... |
| |
| // note that a, b and c are variables in scope of |
| // the block |
| void (^my_block_A)(void) = |
| ^{ size_t id = get_global_id(0); |
| b[id] += a[id]; |
| }; |
| |
| // enqueue the block variable |
| enqueue_kernel(get_default_queue(), |
| CLK_ENQUEUE_FLAGS_WAIT_KERNEL, |
| ndrange, |
| my_block_A); |
| |
| // or we could have done the following |
| enqueue_kernel(get_default_queue(), |
| CLK_ENQUEUE_FLAGS_WAIT_KERNEL, |
| ndrange, |
| ^{ |
| size_t id = get_global_id(0); |
| b[id] += a[id]; |
| }; |
| } |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| NOTE: Blocks passed to <code class="function">enqueue_kernel</code> |
| cannot use global variables or stack variables |
| local to the enclosing lexical scope that are a |
| pointer type in the local or private address space. |
| </p> |
| <div class="informaltable"> |
| <table border="0"> |
| <colgroup> |
| <col align="left" class="col1" /> |
| </colgroup> |
| <tbody> |
| <tr> |
| <td align="left"> |
| kernel void |
| foo(global int *a, local int *lptr, …) |
| { |
| enqueue_kernel(get_default_queue(), |
| CLK_ENQUEUE_FLAGS_WAIT_KERNEL, |
| ndrange, |
| ^{ |
| size_t id = get_global_id(0); |
| local int *p = lptr; // undefined behavior |
| }; |
| } |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <p> |
| See section 6.13.17 of the specification for more information and examples. |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="errors"></a> |
| <h2>Errors</h2> |
| <p> |
| <code class="function">enqueue_kernel</code> returns |
| <span class="errorname">CL_SUCCESS</span> if the |
| block is enqueued successfully and returns |
| <span class="errorname">CL_ENQUEUE_FAILURE</span> |
| otherwise. If the –g compile option is |
| specified in compiler options passed to |
| <a class="citerefentry" href="clCompileProgram.html"><span class="citerefentry"><span class="refentrytitle">clCompileProgram</span></span></a> or |
| <a class="citerefentry" href="clBuildProgram.html"><span class="citerefentry"><span class="refentrytitle">clBuildProgram</span></span></a> |
| when compiling or building the parent program, the following |
| errors may be returned instead of |
| <span class="errorname">CL_ENQUEUE_FAILURE</span> to indicate |
| why <code class="function">enqueue_kernel</code> |
| failed to enqueue the block: |
| </p> |
| <div class="itemizedlist"> |
| <ul class="itemizedlist" style="list-style-type: disc; "> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_INVALID_QUEUE</span> if <code class="varname">queue</code> is not |
| a valid device queue. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_INVALID_NDRANGE</span> if <code class="varname">ndrange</code> |
| is not a valid ND-range descriptor or if the |
| program was compiled with <code class="code">–cl-uniform-work-group-size</code> |
| and the local_work_size is specified in <code class="varname">ndrange</code> |
| but the global_work_size specified in <code class="varname">ndrange</code> |
| is not a multiple of the local_work_size. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_INVALID_EVENT_WAIT_LIST</span> if |
| <code class="varname">event_wait_list</code> is NULL and |
| <code class="varname">num_events_in_wait_list</code> > 0, or if |
| <code class="varname">event_wait_list</code> is not NULL and |
| <code class="varname">num_events_in_wait_list</code> is 0, or if event objects in |
| <code class="varname">event_wait_list</code> are not valid events. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_DEVICE_QUEUE_FULL</span> if |
| <code class="varname">queue</code> is full. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_INVALID_ARG_SIZE</span> if size of local memory arguments is 0. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_EVENT_ALLOCATION_FAILURE</span> |
| if <code class="varname">event_ret</code> is not NULL and an event could not |
| be allocated. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><span class="errorname">CLK_OUT_OF_RESOURCES</span> |
| if there is a failure to queue the block in <code class="varname">queue</code> |
| because of insufficient resources needed to execute the kernel. |
| </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-openclc.pdf#page=162" target="OpenCL Spec">OpenCL Specification</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> |
