'\" t
.\"     Title: clCreateUserEvent
.\"    Author: The Khronos Group
.\" Generator: DocBook XSL Stylesheets vsnapshot <http://docbook.sf.net/>
.\"      Date: 01/14/2021
.\"    Manual: OpenCL Manual
.\"    Source: The Khronos Group
.\"  Language: English
.\"
.TH "CLCREATEUSEREVENT" "3clc" "01/14/2021" "The Khronos Group" "OpenCL Manual"
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.SH "NAME"
clCreateUserEvent \- Creates a user event object\&.
.SH ""
.HP \w'cl_event\ clCreateUserEvent('u
.BI "cl_event clCreateUserEvent(cl_context\ " "context" ", cl_int\ *" "errcode_ret" ");"
.SH "PARAMETERS"
.PP
\fIcontext\fR
.RS 4
A valid OpenCL context used to create the user event object\&.
.RE
.PP
\fIerrcode_ret\fR
.RS 4
Returns an appropriate error code\&. If
\fIerrcode_ret\fR
is NULL, no error code is returned\&.
.RE
.SH "NOTES"
.PP
User events allow applications to enqueue commands that wait on a user event to finish before the command is executed by the device\&.
.PP
The execution status of the user event object created is set to
\fBCL_SUBMITTED\fR\&.
.SH "ERRORS"
.PP
Returns a valid non\-zero buffer object and
\fIerrcode_ret\fR
is set to
CL_SUCCESS
if the user event object is created successfully\&. Otherwise, it returns a NULL value with one of the following error values returned in
\fIerrcode_ret\fR:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_INVALID_CONTEXT if \fIcontext\fR is not a valid context\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_OUT_OF_RESOURCES if there is a failure to allocate resources required
by the OpenCL implementation on the device\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
CL_OUT_OF_HOST_MEMORY if there is a failure to allocate resources
required by the OpenCL implementation on the host\&.
.RE
.SH "SPECIFICATION"
.PP
\m[blue]\fBOpenCL Specification\fR\m[]\&\s-2\u[1]\d\s+2
.SH "SEE ALSO"
.PP
\fBclassDiagram\fR(3clc)
.SH "AUTHORS"
.PP
\fBThe Khronos Group\fR
.SH "COPYRIGHT"
.br
Copyright \(co 2007-2011 The Khronos Group Inc.
.br
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.
.sp
.SH "NOTES"
.IP " 1." 4
OpenCL Specification
.RS 4
\%page 178, section 5.9 - Event Objects
.RE