<html lang="en"> <head> <title>MCLOCK - The GNU Fortran Compiler</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="The GNU Fortran Compiler"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Intrinsic-Procedures.html#Intrinsic-Procedures" title="Intrinsic Procedures"> <link rel="prev" href="MAXVAL.html#MAXVAL" title="MAXVAL"> <link rel="next" href="MCLOCK8.html#MCLOCK8" title="MCLOCK8"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with the Invariant Sections being ``Funding Free Software'', the Front-Cover Texts being (a) (see below), and with the Back-Cover Texts being (b) (see below). A copy of the license is included in the section entitled ``GNU Free Documentation License''. (a) The FSF's Front-Cover Text is: A GNU Manual (b) The FSF's Back-Cover Text is: You have freedom to copy and modify this GNU Manual, like GNU software. Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="MCLOCK"></a> <p> Next: <a rel="next" accesskey="n" href="MCLOCK8.html#MCLOCK8">MCLOCK8</a>, Previous: <a rel="previous" accesskey="p" href="MAXVAL.html#MAXVAL">MAXVAL</a>, Up: <a rel="up" accesskey="u" href="Intrinsic-Procedures.html#Intrinsic-Procedures">Intrinsic Procedures</a> <hr> </div> <h3 class="section">8.166 <code>MCLOCK</code> — Time function</h3> <p><a name="index-MCLOCK-838"></a><a name="index-time_002c-clock-ticks-839"></a><a name="index-clock-ticks-840"></a> <dl> <dt><em>Description</em>:<dd>Returns the number of clock ticks since the start of the process, based on the UNIX function <code>clock(3)</code>. <p>This intrinsic is not fully portable, such as to systems with 32-bit <code>INTEGER</code> types but supporting times wider than 32 bits. Therefore, the values returned by this intrinsic might be, or become, negative, or numerically less than previous values, during a single run of the compiled program. <br><dt><em>Standard</em>:<dd>GNU extension <br><dt><em>Class</em>:<dd>Function <br><dt><em>Syntax</em>:<dd><code>RESULT = MCLOCK()</code> <br><dt><em>Return value</em>:<dd>The return value is a scalar of type <code>INTEGER(4)</code>, equal to the number of clock ticks since the start of the process, or <code>-1</code> if the system does not support <code>clock(3)</code>. <br><dt><em>See also</em>:<dd><a href="CTIME.html#CTIME">CTIME</a>, <a href="GMTIME.html#GMTIME">GMTIME</a>, <a href="LTIME.html#LTIME">LTIME</a>, <a href="MCLOCK.html#MCLOCK">MCLOCK</a>, <a href="TIME.html#TIME">TIME</a> </dl> </body></html>