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/* -----------------------------------------------------------------------------
*
* (c) The GHC Team 2005
*
* Machine-dependent time measurement functions
*
* ---------------------------------------------------------------------------*/
// Not POSIX, due to use of ru_majflt in getPageFaults()
// #include "PosixSource.h"
#include "Rts.h"
#include "GetTime.h"
#include "Clock.h"
#if defined(HAVE_SYS_RESOURCE_H)
# include <sys/resource.h>
#endif
#if defined(HAVE_SYS_TIMES_H)
# include <sys/times.h>
#endif
#if ! (defined(HAVE_GETRUSAGE) || defined(HAVE_TIMES))
#error No implementation for getProcessCPUTime() available.
#endif
#if defined(darwin_HOST_OS)
#include <mach/mach_time.h>
#include <mach/mach_init.h>
#include <mach/thread_act.h>
#include <mach/mach_port.h>
#endif
#if defined(HAVE_GETTIMEOFDAY) && defined(HAVE_GETRUSAGE)
// we'll implement getProcessCPUTime() and getProcessElapsedTime()
// separately, using getrusage() and gettimeofday() respectively
#if defined(darwin_HOST_OS)
static uint64_t timer_scaling_factor_numer = 0;
static uint64_t timer_scaling_factor_denom = 0;
#endif
void initializeTimer()
{
#if defined(darwin_HOST_OS)
mach_timebase_info_data_t info;
(void) mach_timebase_info(&info);
timer_scaling_factor_numer = (uint64_t)info.numer;
timer_scaling_factor_denom = (uint64_t)info.denom;
#endif
}
#if defined(HAVE_CLOCK_GETTIME)
static Time getClockTime(clockid_t clock)
{
struct timespec ts;
int res = clock_gettime(clock, &ts);
if (res == 0) {
return SecondsToTime(ts.tv_sec) + NSToTime(ts.tv_nsec);
} else {
sysErrorBelch("clock_gettime");
stg_exit(EXIT_FAILURE);
}
}
#endif
Time getCurrentThreadCPUTime(void)
{
// N.B. Since macOS Catalina, Darwin supports clock_gettime but does not
// support clock_getcpuclockid. Hence we prefer to use the Darwin-specific
// path on Darwin, even if clock_gettime is available.
#if defined(darwin_HOST_OS)
thread_basic_info_data_t info = { };
mach_msg_type_number_t info_count = THREAD_BASIC_INFO_COUNT;
kern_return_t kern_err = thread_info(mach_thread_self(), THREAD_BASIC_INFO,
(thread_info_t) &info, &info_count);
if (kern_err == KERN_SUCCESS) {
return SecondsToTime(info.user_time.seconds) + USToTime(info.user_time.microseconds);
} else {
sysErrorBelch("getThreadCPUTime");
stg_exit(EXIT_FAILURE);
}
#elif defined(HAVE_CLOCK_GETTIME) && \
defined(CLOCK_PROCESS_CPUTIME_ID) && \
defined(HAVE_SYSCONF)
static bool have_checked_usability = false;
// The RELAXED operation is fine here as it's okay if we do the check below
// more than once.
if (!RELAXED_LOAD(&have_checked_usability)) {
// The Linux clock_getres(2) manpage claims that some early versions of
// Linux will return values which are uninterpretable in the presence
// of migration across CPUs. They claim that clock_getcpuclockid(0)
// will return ENOENT in this case. Check this.
clockid_t clkid;
if (clock_getcpuclockid(0, &clkid)) {
sysErrorBelch("getCurrentThreadCPUTime: no supported");
stg_exit(EXIT_FAILURE);
}
RELAXED_STORE(&have_checked_usability, true);
}
return getClockTime(CLOCK_THREAD_CPUTIME_ID);
#else
#error I know of no means to find the CPU time of current thread on this platform.
#endif
}
Time getProcessCPUTime(void)
{
#if !defined(BE_CONSERVATIVE) && \
defined(HAVE_CLOCK_GETTIME) && \
defined(_SC_CPUTIME) && \
defined(CLOCK_PROCESS_CPUTIME_ID) && \
defined(HAVE_SYSCONF)
static int checked_sysconf = 0;
static int sysconf_result = 0;
if (!checked_sysconf) {
sysconf_result = sysconf(_SC_CPUTIME);
checked_sysconf = 1;
}
if (sysconf_result != -1) {
return getClockTime(CLOCK_PROCESS_CPUTIME_ID);
}
#endif
// fallback to getrusage
{
struct rusage t;
getrusage(RUSAGE_SELF, &t);
return SecondsToTime(t.ru_utime.tv_sec) + USToTime(t.ru_utime.tv_usec);
}
}
StgWord64 getMonotonicNSec(void)
{
#if defined(HAVE_CLOCK_GETTIME)
return getClockTime(CLOCK_ID);
#elif defined(darwin_HOST_OS)
uint64_t time = mach_absolute_time();
return (time * timer_scaling_factor_numer) / timer_scaling_factor_denom;
#else // use gettimeofday()
struct timeval tv;
if (gettimeofday(&tv, (struct timezone *) NULL) != 0) {
debugBlech("getMonotonicNSec: gettimeofday failed: %s", strerror(errno));
};
return (StgWord64)tv.tv_sec * 1000000000 +
(StgWord64)tv.tv_usec * 1000;
#endif
}
Time getProcessElapsedTime(void)
{
return NSToTime(getMonotonicNSec());
}
void getProcessTimes(Time *user, Time *elapsed)
{
*user = getProcessCPUTime();
*elapsed = getProcessElapsedTime();
}
#elif defined(HAVE_TIMES)
// we'll use the old times() API.
Time getProcessCPUTime(void)
{
Time user, elapsed;
getProcessTimes(&user,&elapsed);
return user;
}
Time getProcessElapsedTime(void)
{
Time user, elapsed;
getProcessTimes(&user,&elapsed);
return elapsed;
}
void getProcessTimes(Time *user, Time *elapsed)
{
static uint32_t ClockFreq = 0;
if (ClockFreq == 0) {
#if defined(HAVE_SYSCONF)
long ticks;
ticks = sysconf(_SC_CLK_TCK);
if ( ticks == -1 ) {
sysErrorBelch("sysconf");
stg_exit(EXIT_FAILURE);
}
ClockFreq = ticks;
#elif defined(CLK_TCK) /* defined by POSIX */
ClockFreq = CLK_TCK;
#elif defined(HZ)
ClockFreq = HZ;
#elif defined(CLOCKS_PER_SEC)
ClockFreq = CLOCKS_PER_SEC;
#else
errorBelch("can't get clock resolution");
stg_exit(EXIT_FAILURE);
#endif
}
struct tms t;
clock_t r = times(&t);
*user = SecondsToTime(t.tms_utime) / ClockFreq;
*elapsed = SecondsToTime(r) / ClockFreq;
}
#endif // HAVE_TIMES
void getUnixEpochTime(StgWord64 *sec, StgWord32 *nsec)
{
#if defined(HAVE_GETTIMEOFDAY)
struct timeval tv;
gettimeofday(&tv, (struct timezone *) NULL);
*sec = tv.tv_sec;
*nsec = tv.tv_usec * 1000;
#else
/* Sigh, fall back to second resolution. */
time_t t;
time(&t);
*sec = t;
*nsec = 0;
#endif
}
W_
getPageFaults(void)
{
#if !defined(HAVE_GETRUSAGE) || defined(haiku_HOST_OS)
return 0;
#else
struct rusage t;
getrusage(RUSAGE_SELF, &t);
return(t.ru_majflt);
#endif
}
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