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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "Time::HiRes 3" | |
132 | .TH Time::HiRes 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide" | |
133 | .SH "NAME" | |
134 | Time::HiRes \- High resolution alarm, sleep, gettimeofday, interval timers | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | .Vb 1 | |
138 | \& use Time::HiRes qw( usleep ualarm gettimeofday tv_interval ); | |
139 | .Ve | |
140 | .PP | |
141 | .Vb 1 | |
142 | \& usleep ($microseconds); | |
143 | .Ve | |
144 | .PP | |
145 | .Vb 2 | |
146 | \& ualarm ($microseconds); | |
147 | \& ualarm ($microseconds, $interval_microseconds); | |
148 | .Ve | |
149 | .PP | |
150 | .Vb 2 | |
151 | \& $t0 = [gettimeofday]; | |
152 | \& ($seconds, $microseconds) = gettimeofday; | |
153 | .Ve | |
154 | .PP | |
155 | .Vb 3 | |
156 | \& $elapsed = tv_interval ( $t0, [$seconds, $microseconds]); | |
157 | \& $elapsed = tv_interval ( $t0, [gettimeofday]); | |
158 | \& $elapsed = tv_interval ( $t0 ); | |
159 | .Ve | |
160 | .PP | |
161 | .Vb 1 | |
162 | \& use Time::HiRes qw ( time alarm sleep ); | |
163 | .Ve | |
164 | .PP | |
165 | .Vb 4 | |
166 | \& $now_fractions = time; | |
167 | \& sleep ($floating_seconds); | |
168 | \& alarm ($floating_seconds); | |
169 | \& alarm ($floating_seconds, $floating_interval); | |
170 | .Ve | |
171 | .PP | |
172 | .Vb 2 | |
173 | \& use Time::HiRes qw( setitimer getitimer | |
174 | \& ITIMER_REAL ITIMER_VIRTUAL ITIMER_PROF ); | |
175 | .Ve | |
176 | .PP | |
177 | .Vb 2 | |
178 | \& setitimer ($which, $floating_seconds, $floating_interval ); | |
179 | \& getitimer ($which); | |
180 | .Ve | |
181 | .SH "DESCRIPTION" | |
182 | .IX Header "DESCRIPTION" | |
183 | The \f(CW\*(C`Time::HiRes\*(C'\fR module implements a Perl interface to the usleep, | |
184 | ualarm, gettimeofday, and setitimer/getitimer system calls. See the | |
185 | \&\s-1EXAMPLES\s0 section below and the test scripts for usage; see your system | |
186 | documentation for the description of the underlying usleep, ualarm, | |
187 | gettimeofday, and setitimer/getitimer calls. | |
188 | .PP | |
189 | If your system lacks \fIgettimeofday\fR\|(2) or an emulation of it you don't | |
190 | get \fIgettimeofday()\fR or the one-arg form of \fItv_interval()\fR. | |
191 | If you don't have \fIusleep\fR\|(3) or \fIselect\fR\|(2) you don't get \fIusleep()\fR | |
192 | or \fIsleep()\fR. If your system don't have \fIualarm\fR\|(3) or \fIsetitimer\fR\|(2) you | |
193 | don't get \fIualarm()\fR or \fIalarm()\fR. If you try to import an unimplemented | |
194 | function in the \f(CW\*(C`use\*(C'\fR statement it will fail at compile time. | |
195 | .PP | |
196 | The following functions can be imported from this module. | |
197 | No functions are exported by default. | |
198 | .IP "gettimeofday ()" 4 | |
199 | .IX Item "gettimeofday ()" | |
200 | In array context returns a 2 element array with the seconds and | |
201 | microseconds since the epoch. In scalar context returns floating | |
202 | seconds like \fITime::HiRes::time()\fR (see below). | |
203 | .ie n .IP "usleep ( $useconds )" 4 | |
204 | .el .IP "usleep ( \f(CW$useconds\fR )" 4 | |
205 | .IX Item "usleep ( $useconds )" | |
206 | Sleeps for the number of microseconds specified. Returns the number | |
207 | of microseconds actually slept. Can sleep for more than one second | |
208 | unlike the usleep system call. See also \fITime::HiRes::sleep()\fR below. | |
209 | .ie n .IP "ualarm ( $useconds\fR [, \f(CW$interval_useconds ] )" 4 | |
210 | .el .IP "ualarm ( \f(CW$useconds\fR [, \f(CW$interval_useconds\fR ] )" 4 | |
211 | .IX Item "ualarm ( $useconds [, $interval_useconds ] )" | |
212 | Issues a ualarm call; interval_useconds is optional and will be 0 if | |
213 | unspecified, resulting in alarm-like behaviour. | |
214 | .IP "tv_interval" 4 | |
215 | .IX Item "tv_interval" | |
216 | \&\f(CW\*(C`tv_interval ( $ref_to_gettimeofday [, $ref_to_later_gettimeofday] )\*(C'\fR | |
217 | .Sp | |
218 | Returns the floating seconds between the two times, which should have | |
219 | been returned by \fIgettimeofday()\fR. If the second argument is omitted, | |
220 | then the current time is used. | |
221 | .IP "time ()" 4 | |
222 | .IX Item "time ()" | |
223 | Returns a floating seconds since the epoch. This function can be | |
224 | imported, resulting in a nice drop-in replacement for the \f(CW\*(C`time\*(C'\fR | |
225 | provided with core Perl, see the \s-1EXAMPLES\s0 below. | |
226 | .Sp | |
227 | \&\fB\s-1NOTE\s0 1\fR: this higher resolution timer can return values either less or | |
228 | more than the core \fItime()\fR, depending on whether your platforms rounds | |
229 | the higher resolution timer values up, down, or to the nearest to get | |
230 | the core \fItime()\fR, but naturally the difference should be never more than | |
231 | half a second. | |
232 | .Sp | |
233 | \&\fB\s-1NOTE\s0 2\fR: Since Sunday, September 9th, 2001 at 01:46:40 \s-1AM\s0 \s-1GMT\s0 | |
234 | (when the \fItime()\fR seconds since epoch rolled over to 1_000_000_000), | |
235 | the default floating point format of Perl and the seconds since epoch | |
236 | have conspired to produce an apparent bug: if you print the value of | |
237 | \&\fITime::HiRes::time()\fR you seem to be getting only five decimals, not six | |
238 | as promised (microseconds). Not to worry, the microseconds are there | |
239 | (assuming your platform supports such granularity). What is going on | |
240 | is that the default floating point format of Perl only outputs 15 | |
241 | digits. In this case that means ten digits before the decimal | |
242 | separator and five after. To see the microseconds you can use either | |
243 | printf/sprintf with \f(CW\*(C`%.6f\*(C'\fR, or the \fIgettimeofday()\fR function in list | |
244 | context, which will give you the seconds and microseconds as two | |
245 | separate values. | |
246 | .ie n .IP "sleep ( $floating_seconds )" 4 | |
247 | .el .IP "sleep ( \f(CW$floating_seconds\fR )" 4 | |
248 | .IX Item "sleep ( $floating_seconds )" | |
249 | Sleeps for the specified amount of seconds. Returns the number of | |
250 | seconds actually slept (a floating point value). This function can be | |
251 | imported, resulting in a nice drop-in replacement for the \f(CW\*(C`sleep\*(C'\fR | |
252 | provided with perl, see the \s-1EXAMPLES\s0 below. | |
253 | .ie n .IP "alarm ( $floating_seconds\fR [, \f(CW$interval_floating_seconds ] )" 4 | |
254 | .el .IP "alarm ( \f(CW$floating_seconds\fR [, \f(CW$interval_floating_seconds\fR ] )" 4 | |
255 | .IX Item "alarm ( $floating_seconds [, $interval_floating_seconds ] )" | |
256 | The \s-1SIGALRM\s0 signal is sent after the specfified number of seconds. | |
257 | Implemented using \fIualarm()\fR. The \f(CW$interval_floating_seconds\fR argument | |
258 | is optional and will be 0 if unspecified, resulting in \fIalarm()\fR\-like | |
259 | behaviour. This function can be imported, resulting in a nice drop-in | |
260 | replacement for the \f(CW\*(C`alarm\*(C'\fR provided with perl, see the \s-1EXAMPLES\s0 below. | |
261 | .IP "setitimer" 4 | |
262 | .IX Item "setitimer" | |
263 | \&\f(CW\*(C`setitimer ( $which, $floating_seconds [, $interval_floating_seconds ] )\*(C'\fR | |
264 | .Sp | |
265 | Start up an interval timer: after a certain time, a signal arrives, | |
266 | and more signals may keep arriving at certain intervals. To disable | |
267 | a timer, use time of zero. If interval is set to zero (or unspecified), | |
268 | the timer is disabled \fBafter\fR the next delivered signal. | |
269 | .Sp | |
270 | Use of interval timers may interfere with \fIalarm()\fR, \fIsleep()\fR, and \fIusleep()\fR. | |
271 | In standard-speak the \*(L"interaction is unspecified\*(R", which means that | |
272 | \&\fIanything\fR may happen: it may work, it may not. | |
273 | .Sp | |
274 | In scalar context, the remaining time in the timer is returned. | |
275 | .Sp | |
276 | In list context, both the remaining time and the interval are returned. | |
277 | .Sp | |
278 | There are three interval timers: the \f(CW$which\fR can be \s-1ITIMER_REAL\s0, | |
279 | \&\s-1ITIMER_VIRTUAL\s0, or \s-1ITIMER_PROF\s0. | |
280 | .Sp | |
281 | \&\s-1ITIMER_REAL\s0 results in \fIalarm()\fR\-like behavior. Time is counted in | |
282 | \&\fIreal time\fR, that is, wallclock time. \s-1SIGALRM\s0 is delivered when | |
283 | the timer expires. | |
284 | .Sp | |
285 | \&\s-1ITIMER_VIRTUAL\s0 counts time in (process) \fIvirtual time\fR, that is, only | |
286 | when the process is running. In multiprocessor/user/CPU systems this | |
287 | may be more or less than real or wallclock time. (This time is also | |
288 | known as the \fIuser time\fR.) \s-1SIGVTALRM\s0 is delivered when the timer expires. | |
289 | .Sp | |
290 | \&\s-1ITIMER_PROF\s0 counts time when either the process virtual time or when | |
291 | the operating system is running on behalf of the process (such as | |
292 | I/O). (This time is also known as the \fIsystem time\fR.) (Collectively | |
293 | these times are also known as the \fI\s-1CPU\s0 time\fR.) \s-1SIGPROF\s0 is delivered | |
294 | when the timer expires. \s-1SIGPROF\s0 can interrupt system calls. | |
295 | .Sp | |
296 | The semantics of interval timers for multithreaded programs are | |
297 | system\-specific, and some systems may support additional interval | |
298 | timers. See your \fIsetitimer()\fR documentation. | |
299 | .ie n .IP "getitimer ( $which )" 4 | |
300 | .el .IP "getitimer ( \f(CW$which\fR )" 4 | |
301 | .IX Item "getitimer ( $which )" | |
302 | Return the remaining time in the interval timer specified by \f(CW$which\fR. | |
303 | .Sp | |
304 | In scalar context, the remaining time is returned. | |
305 | .Sp | |
306 | In list context, both the remaining time and the interval are returned. | |
307 | The interval is always what you put in using \fIsetitimer()\fR. | |
308 | .SH "EXAMPLES" | |
309 | .IX Header "EXAMPLES" | |
310 | .Vb 1 | |
311 | \& use Time::HiRes qw(usleep ualarm gettimeofday tv_interval); | |
312 | .Ve | |
313 | .PP | |
314 | .Vb 2 | |
315 | \& $microseconds = 750_000; | |
316 | \& usleep $microseconds; | |
317 | .Ve | |
318 | .PP | |
319 | .Vb 2 | |
320 | \& # signal alarm in 2.5s & every .1s thereafter | |
321 | \& ualarm 2_500_000, 100_000; | |
322 | .Ve | |
323 | .PP | |
324 | .Vb 2 | |
325 | \& # get seconds and microseconds since the epoch | |
326 | \& ($s, $usec) = gettimeofday; | |
327 | .Ve | |
328 | .PP | |
329 | .Vb 7 | |
330 | \& # measure elapsed time | |
331 | \& # (could also do by subtracting 2 gettimeofday return values) | |
332 | \& $t0 = [gettimeofday]; | |
333 | \& # do bunch of stuff here | |
334 | \& $t1 = [gettimeofday]; | |
335 | \& # do more stuff here | |
336 | \& $t0_t1 = tv_interval $t0, $t1; | |
337 | .Ve | |
338 | .PP | |
339 | .Vb 2 | |
340 | \& $elapsed = tv_interval ($t0, [gettimeofday]); | |
341 | \& $elapsed = tv_interval ($t0); # equivalent code | |
342 | .Ve | |
343 | .PP | |
344 | .Vb 8 | |
345 | \& # | |
346 | \& # replacements for time, alarm and sleep that know about | |
347 | \& # floating seconds | |
348 | \& # | |
349 | \& use Time::HiRes; | |
350 | \& $now_fractions = Time::HiRes::time; | |
351 | \& Time::HiRes::sleep (2.5); | |
352 | \& Time::HiRes::alarm (10.6666666); | |
353 | .Ve | |
354 | .PP | |
355 | .Vb 4 | |
356 | \& use Time::HiRes qw ( time alarm sleep ); | |
357 | \& $now_fractions = time; | |
358 | \& sleep (2.5); | |
359 | \& alarm (10.6666666); | |
360 | .Ve | |
361 | .PP | |
362 | .Vb 2 | |
363 | \& # Arm an interval timer to go off first at 10 seconds and | |
364 | \& # after that every 2.5 seconds, in process virtual time | |
365 | .Ve | |
366 | .PP | |
367 | .Vb 1 | |
368 | \& use Time::HiRes qw ( setitimer ITIMER_VIRTUAL time ); | |
369 | .Ve | |
370 | .PP | |
371 | .Vb 2 | |
372 | \& $SIG{VTLARM} = sub { print time, "\en" }; | |
373 | \& setitimer(ITIMER_VIRTUAL, 10, 2.5); | |
374 | .Ve | |
375 | .SH "C API" | |
376 | .IX Header "C API" | |
377 | In addition to the perl \s-1API\s0 described above, a C \s-1API\s0 is available for | |
378 | extension writers. The following C functions are available in the | |
379 | modglobal hash: | |
380 | .PP | |
381 | .Vb 4 | |
382 | \& name C prototype | |
383 | \& --------------- ---------------------- | |
384 | \& Time::NVtime double (*)() | |
385 | \& Time::U2time void (*)(UV ret[2]) | |
386 | .Ve | |
387 | .PP | |
388 | Both functions return equivalent information (like \f(CW\*(C`gettimeofday\*(C'\fR) | |
389 | but with different representations. The names \f(CW\*(C`NVtime\*(C'\fR and \f(CW\*(C`U2time\*(C'\fR | |
390 | were selected mainly because they are operating system independent. | |
391 | (\f(CW\*(C`gettimeofday\*(C'\fR is Un*x\-centric.) | |
392 | .PP | |
393 | Here is an example of using NVtime from C: | |
394 | .PP | |
395 | .Vb 6 | |
396 | \& double (*myNVtime)(); | |
397 | \& SV **svp = hv_fetch(PL_modglobal, "Time::NVtime", 12, 0); | |
398 | \& if (!svp) croak("Time::HiRes is required"); | |
399 | \& if (!SvIOK(*svp)) croak("Time::NVtime isn't a function pointer"); | |
400 | \& myNVtime = INT2PTR(double(*)(), SvIV(*svp)); | |
401 | \& printf("The current time is: %f\en", (*myNVtime)()); | |
402 | .Ve | |
403 | .SH "CAVEATS" | |
404 | .IX Header "CAVEATS" | |
405 | Notice that the core \fItime()\fR maybe rounding rather than truncating. | |
406 | What this means that the core \fItime()\fR may be giving time one second | |
407 | later than \fIgettimeofday()\fR, also known as \fITime::HiRes::time()\fR. | |
408 | .SH "AUTHORS" | |
409 | .IX Header "AUTHORS" | |
410 | D. Wegscheid <wegscd@whirlpool.com> | |
411 | R. Schertler <roderick@argon.org> | |
412 | J. Hietaniemi <jhi@iki.fi> | |
413 | G. Aas <gisle@aas.no> | |
414 | .SH "REVISION" | |
415 | .IX Header "REVISION" | |
416 | $Id: HiRes.pm,v 1.20 1999/03/16 02:26:13 wegscd Exp $ | |
417 | .PP | |
418 | $Log: HiRes.pm,v $ | |
419 | Revision 1.20 1999/03/16 02:26:13 wegscd | |
420 | Add documentation for NVTime and U2Time. | |
421 | .PP | |
422 | Revision 1.19 1998/09/30 02:34:42 wegscd | |
423 | No changes, bump version. | |
424 | .PP | |
425 | Revision 1.18 1998/07/07 02:41:35 wegscd | |
426 | No changes, bump version. | |
427 | .PP | |
428 | Revision 1.17 1998/07/02 01:45:13 wegscd | |
429 | Bump version to 1.17 | |
430 | .PP | |
431 | Revision 1.16 1997/11/13 02:06:36 wegscd | |
432 | version bump to accomodate HiRes.xs fix. | |
433 | .PP | |
434 | Revision 1.15 1997/11/11 02:17:59 wegscd | |
435 | \&\s-1POD\s0 editing, courtesy of Gisle Aas. | |
436 | .PP | |
437 | Revision 1.14 1997/11/06 03:14:35 wegscd | |
438 | Update version # for Makefile.PL and HiRes.xs changes. | |
439 | .PP | |
440 | Revision 1.13 1997/11/05 05:36:25 wegscd | |
441 | change version # for Makefile.pl and HiRes.xs changes. | |
442 | .PP | |
443 | Revision 1.12 1997/10/13 20:55:33 wegscd | |
444 | Force a new version for Makefile.PL changes. | |
445 | .PP | |
446 | Revision 1.11 1997/09/05 19:59:33 wegscd | |
447 | New version to bump version for \s-1README\s0 and Makefile.PL fixes. | |
448 | Fix bad \s-1RCS\s0 log. | |
449 | .PP | |
450 | Revision 1.10 1997/05/23 01:11:38 wegscd | |
451 | Conditional compilation; \s-1EXPORT_FAIL\s0 fixes. | |
452 | .PP | |
453 | Revision 1.2 1996/12/30 13:28:40 wegscd | |
454 | Update documentation for what to do when missing \fIualarm()\fR and friends. | |
455 | .PP | |
456 | Revision 1.1 1996/10/17 20:53:31 wegscd | |
457 | Fix =head1 being next to _\|_END_\|_ so pod2man works | |
458 | .PP | |
459 | Revision 1.0 1996/09/03 18:25:15 wegscd | |
460 | Initial revision | |
461 | .SH "COPYRIGHT" | |
462 | .IX Header "COPYRIGHT" | |
463 | Copyright (c) 1996\-1997 Douglas E. Wegscheid. | |
464 | All rights reserved. This program is free software; you can | |
465 | redistribute it and/or modify it under the same terms as Perl itself. |