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UNIX for Advanced & Expert Users
Performance calculation for Message Queues
Post 302617213 by jim mcnamara on Monday 2nd of April 2012 08:39:50 AM
04-02-2012
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#include <sys/ipc.h>
#include <sys/msg.h>
int main()
{
int qid;
int t;
struct msgbuf mesg;
qid=msgget(IPC_PRIVATE,IPC_CREAT);
mesg.mtype=1L;
mesg.mtext=1;
t=msgsnd(qid,&mesg,1,0);
printf("%d",t);
}
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LEARN ABOUT FREEBSD
uname
UNAME(1) BSD General Commands Manual UNAME(1) NAME
uname -- display information about the system SYNOPSIS
uname [-aiKmnoprsUv] DESCRIPTION
The uname command writes the name of the operating system implementation to standard output. When options are specified, strings represent- ing one or more system characteristics are written to standard output. The options are as follows: -a Behave as though the options -m, -n, -r, -s, and -v were specified. -i Write the kernel ident to standard output. -K Write the FreeBSD version of the kernel. -m Write the type of the current hardware platform to standard output. -n Write the name of the system to standard output. -o This is a synonym for the -s option, for compatibility with other systems. -p Write the type of the machine processor architecture to standard output. -r Write the current release level of the operating system to standard output. -s Write the name of the operating system implementation to standard output. -U Write the FreeBSD version of the user environment. -v Write the version level of this release of the operating system to standard output. If the -a flag is specified, or multiple flags are specified, all output is written on a single line, separated by spaces. The -K and -U flags are intended to be used for fine grain differentiation of incremental FreeBSD development and user visible changes. ENVIRONMENT
An environment variable composed of the string UNAME_ followed by any flag to the uname utility (except for -a) will allow the corresponding data to be set to the contents of the environment variable. EXIT STATUS
The uname utility exits 0 on success, and >0 if an error occurs. SEE ALSO
feature_present(3), getosreldate(3), sysctl(3), uname(3), sysctl(8) STANDARDS
The uname command is expected to conform to the IEEE Std 1003.2 (``POSIX.2'') specification. HISTORY
The uname command appeared in PWB UNIX. The -K and -U extension flags appeared in FreeBSD 10.0. BSD
November 20, 2013 BSD