sdk/2.2/docs/man/html/eventFunctions.html - external/github.com/KhronosGroup/OpenCL-Registry - Git at Google

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 <body class="manpage">
 <div id="header">
 <h1>eventFunctions(3) Manual Page</h1>
 <h2 id="_name">Name</h2>
 <div class="sectionbody">
 <p>eventFunctions - Built-in Event Functions</p>
 </div>
 </div>
 <div id="content">
 <div class="sect1">
 <h2 id="_description">Description</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>The following table describes the list of built-in functions that work on
 events.</p>
 </div>
 <table id="table-builtin-event" class="tableblock frame-all grid-all stretch">
 <caption class="title">Table 1. Built-in Event Functions</caption>
 <colgroup>
 <col style="width: 50%;">
 <col style="width: 50%;">
 </colgroup>
 <thead>
 <tr>
 <th class="tableblock halign-left valign-top"><strong>Built-in Function</strong></th>
 <th class="tableblock halign-left valign-top"><strong>Description</strong></th>
 </tr>
 </thead>
 <tbody>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">void <strong>retain_event</strong>(clk_event_t <em>event</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Increments the event reference count. <em>event</em> must be an event
       returned by enqueue_kernel or enqueue_marker or a user event.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">void <strong>release_event</strong>(clk_event_t <em>event</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Decrements the event reference count.
       The event object is deleted once the event reference count is zero,
       the specific command identified by this event has completed (or
       terminated) and there are no commands in any device command queue that
       require a wait for this event to complete.</p>
 <p class="tableblock">      <em>event</em> must be an event returned by enqueue_kernel, enqueue_marker or
       a user event.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"></td>
 <td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">clk_event_t <strong>create_user_event</strong>()</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Create a user event.
       Returns the user event.
       The execution status of the user event created is set to
       <code>CL_SUBMITTED</code>.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">bool <strong>is_valid_event</strong>(clk_event_t <em>event</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Returns <em>true</em> if <em>event</em> is a valid event.
       Otherwise returns <em>false</em>.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">void <strong>set_user_event_status</strong>(clk_event_t <em>event</em>, int <em>status</em>)</p></td>
 <td class="tableblock halign-left valign-top"><p class="tableblock">Sets the execution status of a user event.
       <em>event</em> must be a user-event.
       <em>status</em> can be either <code>CL_COMPLETE</code> or a negative integer value
       indicating an error.</p></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"></td>
 <td class="tableblock halign-left valign-top"></td>
 </tr>
 <tr>
 <td class="tableblock halign-left valign-top"><p class="tableblock">void <strong>capture_event_profiling_info</strong>(clk_event_t <em>event</em>,
   clk_profiling_info <em>name</em>, global void *<em>value</em>)</p></td>
 <td class="tableblock halign-left valign-top"><div class="content"><div class="paragraph">
 <p>Captures the profiling information for functions that are enqueued as
       commands.
       The specific function being referred to is: enqueue_kernel.
       These enqueued commands are identified by unique event objects.
       The profiling information will be available in <em>value</em> once the
       command identified by <em>event</em> has completed.</p>
 </div>
 <div class="paragraph">
 <p><em>event</em> must be an event returned by enqueue_kernel.</p>
 </div>
 <div class="paragraph">
 <p><em>name</em> identifies which profiling information is to be queried and can be:</p>
 </div>
 <div class="paragraph">
 <p><code>CLK_PROFILING_COMMAND_EXEC_TIME</code></p>
 </div>
 <div class="paragraph">
 <p><em>value</em> is a pointer to two 64-bit values.</p>
 </div>
 <div class="paragraph">
 <p>The first 64-bit value describes the elapsed time <code>CL_PROFILING_COMMAND_END</code>
 - <code>CL_PROFLING_COMMAND_START</code> for the command identified by <em>event</em> in
 nanoseconds.</p>
 </div>
 <div class="paragraph">
 <p>The second 64-bit value describes the elapsed time
 <code>CL_PROFILING_COMMAND_COMPLETE</code> - <code>CL_PROFILING_COMAMND_START</code> for the
 command identified by <em>event</em> in nanoseconds.</p>
 </div>
 <div class="admonitionblock note">
 <table>
 <tr>
 <td class="icon">
 <i class="fa icon-note" title="Note"></i>
 </td>
 <td class="content">
 <div class="paragraph">
 <p>The behavior of capture_event_profiling_info when called multiple times for
 the same <em>event</em> is undefined.</p>
 </div>
 </td>
 </tr>
 </table>
 </div></div></td>
 </tr>
 </tbody>
 </table>
 <div class="paragraph">
 <p>Events can be used to identify commands enqueued to a command-queue from the
 host.
 These events created by the OpenCL runtime can only be used on the host,
 i.e. as events passed in the <em>event_wait_list</em> argument to various
 <strong>clEnqueue</strong> APIs or runtime APIs that take events as arguments, such as
 <strong>clRetainEvent</strong>, <strong>clReleaseEvent</strong>, and <strong>clGetEventProfilingInfo</strong>.</p>
 </div>
 <div class="paragraph">
 <p>Similarly, events can be used to identify commands enqueued to a device
 queue (from a kernel).
 These event objects cannot be passed to the host or used by OpenCL runtime
 APIs such as the <strong>clEnqueue</strong> APIs or runtime APIs that take event arguments.</p>
 </div>
 <div class="paragraph">
 <p><strong>clRetainEvent</strong> and <strong>clReleaseEvent</strong> will return <code>CL_INVALID_OPERATION</code> if
 <em>event</em> specified is an event that refers to any kernel enqueued to a device
 queue using <strong>enqueue_kernel</strong> or <strong>enqueue_marker</strong>, or is a user event created
 by <strong>create_user_event</strong>.</p>
 </div>
 <div class="paragraph">
 <p>Similarly, <strong>clSetUserEventStatus</strong> can only be used to set the execution
 status of events created using <strong>clCreateUserEvent</strong>.
 User events created on the device can be set using set_user_event_status
 built-in function.</p>
 </div>
 <div class="paragraph">
 <p>The example below shows how events can be used with kernels enqueued to
 multiple device queues.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-c" data-lang="c">extern void barA_kernel(...);
 extern void barB_kernel(...);

 kernel void
 foo(queue_t q0, queue q1, ...)
 {
     ...
     clk_event_t evt0;

     // enqueue kernel to queue q0
     enqueue_kernel(q0,
                    CLK_ENQUEUE_FLAGS_NO_WAIT,
                    ndrange_A,
                    0, NULL, &amp;evt0,
                    ^{barA_kernel(...);} );

     // enqueue kernel to queue q1
     enqueue_kernel(q1,
                    CLK_ENQUEUE_FLAGS_NO_WAIT,
                    ndrange_B,
                    1, &amp;evt0, NULL,
                    ^{barB_kernel(...);} );

     // release event evt0. This will get released
     // after barA_kernel enqueued in queue q0 has finished
     // execution and barB_kernel enqueued in queue q1 and
     // waits for evt0 is submitted for execution, i.e. wait
     // for evt0 is satisfied.
     release_event(evt0);

 }</code></pre>
 </div>
 </div>
 <div class="paragraph">
 <p>The example below shows how the marker command can be used with kernels
 enqueued to a device queue.</p>
 </div>
 <div class="listingblock">
 <div class="content">
 <pre class="highlight"><code class="language-c" data-lang="c">kernel void
 foo(queue_t q, ...)
 {
     ...
     clk_event_t marker_event;
     clk_event_t events[2];

     enqueue_kernel(q,
                    CLK_ENQUEUE_FLAGS_NO_WAIT,
                    ndrange,
                    0, NULL, &amp;events[0],
                    ^{barA_kernel(...);} );

     enqueue_kernel(q,
                    CLK_ENQUEUE_FLAGS_NO_WAIT,
                    ndrange,
                    0, NULL, &amp;events[1],
                    ^{barB_kernel(...);} );

     // barA_kernel and barB_kernel can be executed
     // out of order. we need to wait for both these
     // kernels to finish execution before barC_kernel
     // starts execution so we enqueue a marker command and
     // then enqueue barC_kernel that waits on the event
     // associated with the marker.
     enqueue_marker(q, 2, events, &amp;marker_event);

     enqueue_kernel(q,
                    CLK_ENQUEUE_FLAGS_NO_WAIT,
                    1, &amp;marker_event, NULL,
                    ^{barC_kernel(...);} );

     release_event(events[0];
     release_event(events[1]);
     release_event(marker_event);
 }</code></pre>
 </div>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_see_also">See Also</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>No cross-references are available</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_document_notes">Document Notes</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>For more information, see the <a href="https://www.khronos.org/registry/OpenCL/specs/2.2/html/OpenCL_C.html#built-in-functions-event-functions" target="_blank" rel="noopener">OpenCL C Specification</a></p>
 </div>
 <div class="paragraph">
 <p>This page is extracted from the OpenCL C Specification.
 Fixes and changes should be made to the Specification, not directly.</p>
 </div>
 </div>
 </div>
 <div class="sect1">
 <h2 id="_copyright">Copyright</h2>
 <div class="sectionbody">
 <div class="paragraph">
 <p>Copyright (c) 2014-2020 Khronos Group. This work is licensed under a
 <a href="http://creativecommons.org/licenses/by/4.0/" target="_blank" rel="noopener">Creative Commons
 Attribution 4.0 International License</a>.</p>
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