Trailing-Edge
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PDP-10 Archives
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SRI_NIC_PERM_FS_1_19910112
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c/lib/gen/clock.c
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/*
** CLOCK - get process CPU run time
**
** (c) Copyright Ken Harrenstien 1989
**
** 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>
#if SYS_T20+SYS_10X+SYS_T10+SYS_CSI+SYS_WTS+SYS_ITS /* Systems supported for */
#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_WTS+SYS_T10+SYS_CSI
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 1,07745\n"); /* mult by 4096 to convert to nsec, */
asm(" DIV 1,[03641100]\n"); /* div by 1^6 to get msecs. */
#else
return 0;
#endif
}
#endif /* T20+10X+T10+CSI+WAITS+ITS */