In list context, both the remaining time and the interval are returned. The interval is always what you put in using setitimer. See your system documentation for other possibly supported values. NOTE : the resolution returned may be highly optimistic. The system might not actually be able to measure events at that resolution, and the various overheads and the overall system load are certain to affect any timings. Returns the number of nanoseconds actually slept.
What this means is that you probably need to store the result of your first call to clock , and subtract that value from the following results of clock. The time returned also includes the process times of the terminated child processes for which wait has been executed. This value is somewhat like the second value returned by the times of core Perl, but not necessarily identical. Note that due to backward compatibility limitations the returned value may wrap around at about seconds or at about 36 minutes.
To override the standard stat :. There are unfortunately no easy ways to find out whether the filesystem supports such timestamps. In any case do not expect nanosecond resolution, or even a microsecond resolution. The actual achievable subsecond resolution depends on the combination of the operating system and the filesystem. Modifying the timestamps may not be possible at all: for example, the noatime filesystem mount option may prohibit you from changing the access time timestamp.
The following C functions are available in the modglobal hash:. Both functions return equivalent information like gettimeofday but with different representations. The names NVtime and U2time were selected mainly because they are operating system independent.
Something went horribly wrong-- the number of microseconds that cannot become negative just became negative. Maybe your compiler is broken? In some platforms it is not possible to get an alarm with subsecond resolution and later than one second.
Notice that the core time maybe rounding rather than truncating. What this means is that the core time may be reporting the time as one second later than gettimeofday and Time::HiRes::time. Adjusting the system clock either manually or by services like ntp may cause problems, especially for long running programs that assume a monotonously increasing time note that all platforms do not adjust time as gracefully as UNIX ntp does.
For example in Win32 and derived platforms like Cygwin and MinGW the Time::HiRes::time may temporarily drift off from the system clock and the original time by up to 0.
Time::HiRes will notice this eventually and recalibrate. Note that since Time::HiRes 1. In pre-Sierra macOS pre Or UTF Checking how to flush all pending stdio output Your fflush NULL works okay for output streams.
Let's see if it clobbers input pipes Checking how to print bit integers Checking the format strings to be used for Perl's internal types Checking the format string to be used for gids What type pointer is the second argument to getgroups and setgroups? What is the type for the 1st argument to gethostbyaddr? Your select operates on 64 bits at a time. Generating a list of signal names and numbers Your stdio uses signed chars.
Checking the format string to be used for uids Would you like to build perl with strict enabled by default? I'm unable to compile the test program. Which compiler compiler byacc or yacc or bison -y shall I use? Guessing which symbols your C compiler and preprocessor define Looking for extensions What extensions do you wish to load dynamically?
Creating config. Doing variable substitutions on. SH files Extracting config. SH: Adding -Wextra. SH: Adding -Wwrite-strings. Now you must run 'make'.
If you compile perl5 on a different machine or from a different object directory, copy the Policy. Please run make minitest; exit 1'. PL -q. PL Errno. PL lib. PL XSLoader. PL DynaLoader. PL installing ppport. PL PPPort. PL ppport. Extra libraries: -lrt Have syscall Looking for gettimeofday Looking for setitimer Looking for getitimer You have interval timers both setitimer and getitimer.
Looking for ualarm Looking for usleep Looking for nanosleep You can mix subsecond sleeps with signals, if you want to. It's still not portable, though. Looking for clock Looking for working futimens Looking for working utimensat You seem to have subsecond timestamp setting. Looking for stat subsecond timestamps NOT found. You seem to have subsecond timestamp reading. Your struct stat has them, but the filesystems must help. PL Extracting corelist with variable substitutions..
PL Extracting cpan with variable substitutions.. PL Extracting h2ph with variable substitutions.. PL Extracting h2xs with variable substitutions..
PL Extracting instmodsh with variable substitutions.. PL Extracting perlbug with variable substitutions.. PL Extracting "perldoc" with variable substitutions..
PL Extracting perlivp with variable substitutions.. PL Extracting pl2pm with variable substitutions.. PL Extracting prove with variable substitutions.. PL Extracting ptar with variable substitutions..
PL Extracting ptardiff with variable substitutions.. PL Extracting ptargrep with variable substitutions..
PL Extracting shasum with variable substitutions.. PL Extracting splain with variable substitutions.. PL Extracting libnetcfg with variable substitutions.. PL Extracting piconv with variable substitutions..
PL Extracting enc2xs with variable substitutions.. PL Extracting encguess with variable substitutions.. PL Extracting xsubpp with variable substitutions.. PL Extracting pod2html with variable substitutions.. PL Extracting zipdetails with variable substitutions.. I should have been more specific. All we really need at this point is the output from:.
MaintainUplift , two updates:. Second, I've been trying to wrap my head around what stat. I think this is an accurate description:. Win32 unfortunately does not have interval timers. Time is counted in real time ; that is, wallclock time. This time is also known as the user time. This time is also known as the system time.
The sum of user time and system time is known as the CPU time. The semantics of interval timers for multithreaded programs are system-specific, and some systems may support additional interval timers. For example, it is unspecified which thread gets the signals. See your setitimer 2 documentation.
In list context, both the remaining time and the interval are returned. The interval is always what you put in using setitimer. See your system documentation for other possibly supported values. NOTE : the resolution returned may be highly optimistic. The system might not actually be able to measure events at that resolution, and the various overheads and the overall system load are certain to affect any timings. Returns the number of nanoseconds actually slept.
What this means is that you probably need to store the result of your first call to clock , and subtract that value from the following results of clock.
The time returned also includes the process times of the terminated child processes for which wait has been executed. This value is somewhat like the second value returned by the times of core Perl, but not necessarily identical.
Note that due to backward compatibility limitations the returned value may wrap around at about seconds or at about 36 minutes. To override the standard stat :. There are unfortunately no easy ways to find out whether the filesystem supports such timestamps. In any case do not expect nanosecond resolution, or even a microsecond resolution.
The actual achievable subsecond resolution depends on the combination of the operating system and the filesystem. Modifying the timestamps may not be possible at all: for example, the noatime filesystem mount option may prohibit you from changing the access time timestamp.
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