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+.\"	$OpenBSD: moncontrol.3,v 1.11 2025/09/02 00:27:38 yasuoka Exp $
+.\"
+.\" Copyright (c) 1980, 1991, 1992, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: September 2 2025 $
+.Dt MONCONTROL 3
+.Os
+.Sh NAME
+.Nm moncontrol
+.Nd control execution profile
+.Sh SYNOPSIS
+.In sys/gmon.h
+.Ft void
+.Fn moncontrol "int mode"
+.Sh DESCRIPTION
+An executable program compiled using the
+.Fl pg
+option to
+.Xr cc 1
+automatically includes calls to collect statistics for the
+.Xr gprof 1
+call-graph execution profiler.
+Profiling begins at program startup and ends when the program calls exit.
+When the program exits, the profiling data are written to the file
+.Em gmon.progname.pid.out ,
+then
+.Xr gprof 1
+can be used to examine the results.
+.Pp
+.Fn moncontrol
+selectively controls profiling within a program.
+When the program starts, profiling begins.
+To stop the collection of histogram ticks and call counts use
+.Fn moncontrol 0 ;
+to resume the collection of histogram ticks and call counts use
+.Fn moncontrol 1 .
+This feature allows the cost of particular operations to be measured.
+Note that an output file will be produced on program exit
+regardless of the state of
+.Fn moncontrol .
+.Sh FILES
+.Bl -tag -width gmon.progname.pid.out -compact
+.It Pa gmon.progname.pid.out
+execution data file
+.El
+.Sh SEE ALSO
+.Xr cc 1 ,
+.Xr gprof 1 ,
+.Xr profil 2
+.Sh CAVEATS
+Do not call
+.Fn moncontrol 0
+if
+.Xr pthread_create 3
+will be called subsequently.
+While profiling is stopped,
+.Xr pthread_create 3
+does not allocate the collection buffer for the new thread.
+This cannot be recovered by
+.Fn moncontrol 1 ,
+resulting in failure to collect the statistics for those threads.