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| <h3 class="section">8.170 <code>MCLOCK8</code> — Time function (64-bit)</h3> |
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| <p><a name="index-MCLOCK8-871"></a><a name="index-time_002c-clock-ticks-872"></a><a name="index-clock-ticks-873"></a> |
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| <dt><em>Description</em>:<dd>Returns the number of clock ticks since the start of the process, based |
| on the function <code>clock(3)</code> in the C standard library. |
| |
| <p><em>Warning:</em> this intrinsic does not increase the range of the timing |
| values over that returned by <code>clock(3)</code>. On a system with a 32-bit |
| <code>clock(3)</code>, <code>MCLOCK8</code> will return a 32-bit value, even though |
| it is converted to a 64-bit <code>INTEGER(8)</code> value. That means |
| overflows of the 32-bit value can still occur. 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 = MCLOCK8()</code> |
| |
| <br><dt><em>Return value</em>:<dd>The return value is a scalar of type <code>INTEGER(8)</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="TIME8.html#TIME8">TIME8</a> |
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