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<title>NVIDIA CUDA Library: cudaEventRecord</title>
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<div class="navpath"><a class="el" href="group__CUDART__EVENT.html">Event Management</a>
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<tr><td class="navtab"><a class="qindex" href="group__CUDART__EVENT_g320ab51604f3a7a082795202e7eaf774.html#g320ab51604f3a7a082795202e7eaf774">cudaEventCreate</a></td></tr>
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<a class="anchor" name="ga324d5ce3fbf46899b15e5e42ff9cfa5"></a><!-- doxytag: member="cuda_runtime_api.h::cudaEventRecord" ref="ga324d5ce3fbf46899b15e5e42ff9cfa5" args="(cudaEvent_t event, cudaStream_t stream=0)" -->
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<td class="memname"><a class="el" href="group__CUDART__TYPES_gf599e5b8b829ce7db0f5216928f6ecb6.html#gf599e5b8b829ce7db0f5216928f6ecb6">cudaError_t</a> cudaEventRecord </td>
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<td class="paramtype"><a class="el" href="group__CUDART__TYPES_gea2f543a9fc0e52fe4ae712920fd1247.html#gea2f543a9fc0e52fe4ae712920fd1247">cudaEvent_t</a> </td>
<td class="paramname"> <em>event</em>, </td>
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<td class="paramname"> <em>stream</em> = <code>0</code></td><td> </td>
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Records an event. If <code>stream</code> is non-zero, the event is recorded after all preceding operations in <code>stream</code> have been completed; otherwise, it is recorded after all preceding operations in the CUDA context have been completed. Since operation is asynchronous, <a class="el" href="group__CUDART__EVENT_gf8e4ddb569b1da032c060f0c54da698f.html#gf8e4ddb569b1da032c060f0c54da698f" title="Queries an event's status.">cudaEventQuery()</a> and/or <a class="el" href="group__CUDART__EVENT_g08241bcf5c5cb686b1882a8492f1e2d9.html#g08241bcf5c5cb686b1882a8492f1e2d9" title="Waits for an event to complete.">cudaEventSynchronize()</a> must be used to determine when the event has actually been recorded.<p>
If <a class="el" href="group__CUDART__EVENT_ga324d5ce3fbf46899b15e5e42ff9cfa5.html#ga324d5ce3fbf46899b15e5e42ff9cfa5" title="Records an event.">cudaEventRecord()</a> has previously been called on <code>event</code>, then this call will overwrite any existing state in <code>event</code>. Any subsequent calls which examine the status of <code>event</code> will only examine the completion of this most recent call to <a class="el" href="group__CUDART__EVENT_ga324d5ce3fbf46899b15e5e42ff9cfa5.html#ga324d5ce3fbf46899b15e5e42ff9cfa5" title="Records an event.">cudaEventRecord()</a>.<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>event</em> </td><td>- Event to record </td></tr>
<tr><td valign="top"></td><td valign="top"><em>stream</em> </td><td>- Stream in which to record event</td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd><a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e0038e355f04607d824883b4a50662830d591">cudaSuccess</a>, <a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e00383e8aef5398ee38e28ed41e357b48917c">cudaErrorInvalidValue</a>, <a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e0038ce7993a88ecf2c57b8102d55d997a18c">cudaErrorInitializationError</a>, <a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e0038c4673247aee4d1ab8d07871f376e0273">cudaErrorInvalidResourceHandle</a>, <a class="el" href="group__CUDART__TYPES_g3f51e3575c2178246db0a94a430e0038.html#gg3f51e3575c2178246db0a94a430e0038099def426efea2b2366d8d7ad09f974a">cudaErrorLaunchFailure</a> </dd></dl>
<dl class="note" compact><dt><b>Note:</b></dt><dd>Note that this function may also return error codes from previous, asynchronous launches.</dd></dl>
<dl class="see" compact><dt><b>See also:</b></dt><dd><a class="el" href="group__CUDART__EVENT_g320ab51604f3a7a082795202e7eaf774.html#g320ab51604f3a7a082795202e7eaf774">cudaEventCreate (C API)</a>, <a class="el" href="group__CUDART__EVENT_g358607fbf0169c75b5f9dad38edba956.html#g358607fbf0169c75b5f9dad38edba956" title="Creates an event object with the specified flags.">cudaEventCreateWithFlags</a>, <a class="el" href="group__CUDART__EVENT_gf8e4ddb569b1da032c060f0c54da698f.html#gf8e4ddb569b1da032c060f0c54da698f" title="Queries an event's status.">cudaEventQuery</a>, <a class="el" href="group__CUDART__EVENT_g08241bcf5c5cb686b1882a8492f1e2d9.html#g08241bcf5c5cb686b1882a8492f1e2d9" title="Waits for an event to complete.">cudaEventSynchronize</a>, <a class="el" href="group__CUDART__EVENT_g513a33d6c552db36be7edc5b3e9e0765.html#g513a33d6c552db36be7edc5b3e9e0765" title="Destroys an event object.">cudaEventDestroy</a>, <a class="el" href="group__CUDART__EVENT_g14c387cc57ce2e328f6669854e6020a5.html#g14c387cc57ce2e328f6669854e6020a5" title="Computes the elapsed time between events.">cudaEventElapsedTime</a>, <a class="el" href="group__CUDART__STREAM_gfe68d207dc965685d92d3f03d77b0876.html#gfe68d207dc965685d92d3f03d77b0876" title="Make a compute stream wait on an event.">cudaStreamWaitEvent</a> </dd></dl>
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