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111 lines
2.6 KiB
C
111 lines
2.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* getrusage.c
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* get information about resource utilisation
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*
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* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/port/getrusage.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "c.h"
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#include "rusagestub.h"
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/* This code works on:
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* solaris_i386
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* solaris_sparc
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* hpux 9.*
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* win32
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* which currently is all the supported platforms that don't have a
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* native version of getrusage(). So, if configure decides to compile
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* this file at all, we just use this version unconditionally.
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*/
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int
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getrusage(int who, struct rusage *rusage)
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{
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#ifdef WIN32
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FILETIME starttime;
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FILETIME exittime;
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FILETIME kerneltime;
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FILETIME usertime;
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ULARGE_INTEGER li;
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if (who != RUSAGE_SELF)
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{
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/* Only RUSAGE_SELF is supported in this implementation for now */
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errno = EINVAL;
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return -1;
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}
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if (rusage == (struct rusage *) NULL)
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{
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errno = EFAULT;
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return -1;
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}
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memset(rusage, 0, sizeof(struct rusage));
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if (GetProcessTimes(GetCurrentProcess(),
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&starttime, &exittime, &kerneltime, &usertime) == 0)
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{
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_dosmaperr(GetLastError());
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return -1;
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}
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/* Convert FILETIMEs (0.1 us) to struct timeval */
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memcpy(&li, &kerneltime, sizeof(FILETIME));
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li.QuadPart /= 10L; /* Convert to microseconds */
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rusage->ru_stime.tv_sec = li.QuadPart / 1000000L;
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rusage->ru_stime.tv_usec = li.QuadPart % 1000000L;
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memcpy(&li, &usertime, sizeof(FILETIME));
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li.QuadPart /= 10L; /* Convert to microseconds */
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rusage->ru_utime.tv_sec = li.QuadPart / 1000000L;
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rusage->ru_utime.tv_usec = li.QuadPart % 1000000L;
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#else /* all but WIN32 */
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struct tms tms;
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int tick_rate = CLK_TCK; /* ticks per second */
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clock_t u,
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s;
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if (rusage == (struct rusage *) NULL)
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{
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errno = EFAULT;
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return -1;
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}
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if (times(&tms) < 0)
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{
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/* errno set by times */
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return -1;
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}
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switch (who)
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{
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case RUSAGE_SELF:
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u = tms.tms_utime;
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s = tms.tms_stime;
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break;
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case RUSAGE_CHILDREN:
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u = tms.tms_cutime;
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s = tms.tms_cstime;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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#define TICK_TO_SEC(T, RATE) ((T)/(RATE))
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#define TICK_TO_USEC(T,RATE) (((T)%(RATE)*1000000)/RATE)
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rusage->ru_utime.tv_sec = TICK_TO_SEC(u, tick_rate);
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rusage->ru_utime.tv_usec = TICK_TO_USEC(u, tick_rate);
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rusage->ru_stime.tv_sec = TICK_TO_SEC(s, tick_rate);
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rusage->ru_stime.tv_usec = TICK_TO_USEC(u, tick_rate);
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#endif /* WIN32 */
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return 0;
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}
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