1 /*-------------------------------------------------------------------------
4 * get information about resource utilisation
6 * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
7 * Portions Copyright (c) 1994, Regents of the University of California
11 * src/port/getrusage.c
13 *-------------------------------------------------------------------------
18 #include "rusagestub.h"
20 /* This code works on:
26 * which currently is all the supported platforms that don't have a
27 * native version of getrusage(). So, if configure decides to compile
28 * this file at all, we just use this version unconditionally.
32 getrusage(int who, struct rusage * rusage)
42 if (who != RUSAGE_SELF)
44 /* Only RUSAGE_SELF is supported in this implementation for now */
49 if (rusage == (struct rusage *) NULL)
54 memset(rusage, 0, sizeof(struct rusage));
55 if (GetProcessTimes(GetCurrentProcess(),
56 &starttime, &exittime, &kerneltime, &usertime) == 0)
58 _dosmaperr(GetLastError());
62 /* Convert FILETIMEs (0.1 us) to struct timeval */
63 memcpy(&li, &kerneltime, sizeof(FILETIME));
64 li.QuadPart /= 10L; /* Convert to microseconds */
65 rusage->ru_stime.tv_sec = li.QuadPart / 1000000L;
66 rusage->ru_stime.tv_usec = li.QuadPart % 1000000L;
68 memcpy(&li, &usertime, sizeof(FILETIME));
69 li.QuadPart /= 10L; /* Convert to microseconds */
70 rusage->ru_utime.tv_sec = li.QuadPart / 1000000L;
71 rusage->ru_utime.tv_usec = li.QuadPart % 1000000L;
72 #else /* all but WIN32 */
75 int tick_rate = CLK_TCK; /* ticks per second */
79 if (rusage == (struct rusage *) NULL)
86 /* errno set by times */
103 #define TICK_TO_SEC(T, RATE) ((T)/(RATE))
104 #define TICK_TO_USEC(T,RATE) (((T)%(RATE)*1000000)/RATE)
105 rusage->ru_utime.tv_sec = TICK_TO_SEC(u, tick_rate);
106 rusage->ru_utime.tv_usec = TICK_TO_USEC(u, tick_rate);
107 rusage->ru_stime.tv_sec = TICK_TO_SEC(s, tick_rate);
108 rusage->ru_stime.tv_usec = TICK_TO_USEC(u, tick_rate);