Trailing-Edge
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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/lib5/clock.c
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/* CLOCK - returns process CPU run time
** As described in [H&S v2 sec 20.1]
** All of these PDP-10 implementations return time in milliseconds
** (that is, CLK_TCK is 1000)
*/
#include "c-env.h"
#include "time.h"
clock_t
clock()
{
#if SYS_T20
asm("SEARCH MONSYM\n");
asm(" MOVEI 1,.FHSLF\n"); /* For this process, */
asm(" RUNTM%\n"); /* get runtime in AC 1 */
#elif SYS_10X
asm("SEARCH MONSYM\n");
asm(" JOBTM\n"); /* Puts result in AC 1 */
#elif SYS_WAITS+SYS_T10
asm(" SETZ 1,\n"); /* For our job, */
asm(" RUNTIM 1,\n"); /* get runtime in return AC */
#elif SYS_ITS
asm(" .SUSET [.RRUNT,,1]\n"); /* Get runtime in 4.096 usec units */
asm(" MULI 1,^D4069\n"); /* Convert to nanoseconds, */
asm(" DIV 1,[^D1000000]\n"); /* then to milliseconds. */
#else
#error clock() not supported for this system.
#endif
}