moncontrol(3) BSD Library Functions Manual moncontrol(3)
NAME
moncontrol, monstartup -- control execution profile
SYNOPSIS
moncontrol(int mode);
monstartup(u_long *lowpc, u_long *highpc);
DESCRIPTION
An executable program compiled using the -pg option to cc(1) automati-
cally includes calls to collect statistics for the gprof(1) call-graph
execution profiler. In typical operation, profiling begins at program
startup and ends when the program calls exit. When the program exits,
the profiling data are written to the file gmon.out, then gprof(1) can be
used to examine the results.
moncontrol() selectively controls profiling within a program. When the
program starts, profiling begins. To stop the collection of histogram
ticks and call counts use moncontrol(0); to resume the collection of his-
togram ticks and call counts use 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 moncontrol().
Programs that are not loaded with -pg may selectively collect profiling
statistics by calling monstartup() with the range of addresses to be pro-
filed. lowpc and highpc specify the address range that is to be sampled;
the lowest address sampled is that of lowpc and the highest is just below
highpc. Only functions in that range that have been compiled with the
-pg option to cc(1) will appear in the call graph part of the output;
however, all functions in that address range will have their execution
time measured. Profiling begins on return from monstartup().
FILES
gmon.out execution data file
SEE ALSO
cc(1), gprof(1), profil(2)
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution
Mac OS X 10.8 - Generated Wed Aug 29 14:58:27 CDT 2012