glib/gtimer.c

   1 /* GLIB - Library of useful routines for C programming
   2  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  */
  19
  20 /*
  21  * Modified by the GLib Team and others 1997-2000.  See the AUTHORS
  22  * file for a list of people on the GLib Team.  See the ChangeLog
  23  * files for a list of changes.  These files are distributed with
  24  * GLib at ftp://ftp.gtk.org/pub/gtk/.
  25  */
  26
  27 /*
  28  * MT safe
  29  */
  30
  31 #include "config.h"
  32 #include "glibconfig.h"
  33
  34 #include <stdlib.h>
  35
  36 #ifdef HAVE_UNISTD_H
  37 #include <unistd.h>
  38 #endif /* HAVE_UNISTD_H */
  39
  40 #ifdef HAVE_SYS_TIME_H
  41 #include <sys/time.h>
  42 #endif
  43 #include <time.h>
  44 #ifndef G_OS_WIN32
  45 #include <errno.h>
  46 #endif /* G_OS_WIN32 */
  47
  48 #ifdef G_OS_WIN32
  49 #include <windows.h>
  50 #endif /* G_OS_WIN32 */
  51
  52 #include "gtimer.h"
  53
  54 #include "gmem.h"
  55 #include "gstrfuncs.h"
  56 #include "gtestutils.h"
  57 #include "gmain.h"
  58
  59 /**
  60  * SECTION:timers
  61  * @title: Timers
  62  * @short_description: keep track of elapsed time
  63  *
  64  * #GTimer records a start time, and counts microseconds elapsed since
  65  * that time. This is done somewhat differently on different platforms,
  66  * and can be tricky to get exactly right, so #GTimer provides a
  67  * portable/convenient interface.
  68  **/
  69
  70 /**
  71  * GTimer:
  72  *
  73  * Opaque datatype that records a start time.
  74  **/
  75 struct _GTimer
  76 {
  77   guint64 start;
  78   guint64 end;
  79
  80   guint active : 1;
  81 };
  82
  83 /**
  84  * g_timer_new:
  85  * @Returns: a new #GTimer.
  86  *
  87  * Creates a new timer, and starts timing (i.e. g_timer_start() is
  88  * implicitly called for you).
  89  **/
  90 GTimer*
  91 g_timer_new (void)
  92 {
  93   GTimer *timer;
  94
  95   timer = g_new (GTimer, 1);
  96   timer->active = TRUE;
  97
  98   timer->start = g_get_monotonic_time ();
  99
 100   return timer;
 101 }
 102
 103 /**
 104  * g_timer_destroy:
 105  * @timer: a #GTimer to destroy.
 106  *
 107  * Destroys a timer, freeing associated resources.
 108  **/
 109 void
 110 g_timer_destroy (GTimer *timer)
 111 {
 112   g_return_if_fail (timer != NULL);
 113
 114   g_free (timer);
 115 }
 116
 117 /**
 118  * g_timer_start:
 119  * @timer: a #GTimer.
 120  *
 121  * Marks a start time, so that future calls to g_timer_elapsed() will
 122  * report the time since g_timer_start() was called. g_timer_new()
 123  * automatically marks the start time, so no need to call
 124  * g_timer_start() immediately after creating the timer.
 125  **/
 126 void
 127 g_timer_start (GTimer *timer)
 128 {
 129   g_return_if_fail (timer != NULL);
 130
 131   timer->active = TRUE;
 132
 133   timer->start = g_get_monotonic_time ();
 134 }
 135
 136 /**
 137  * g_timer_stop:
 138  * @timer: a #GTimer.
 139  *
 140  * Marks an end time, so calls to g_timer_elapsed() will return the
 141  * difference between this end time and the start time.
 142  **/
 143 void
 144 g_timer_stop (GTimer *timer)
 145 {
 146   g_return_if_fail (timer != NULL);
 147
 148   timer->active = FALSE;
 149
 150   timer->end = g_get_monotonic_time ();
 151 }
 152
 153 /**
 154  * g_timer_reset:
 155  * @timer: a #GTimer.
 156  *
 157  * This function is useless; it's fine to call g_timer_start() on an
 158  * already-started timer to reset the start time, so g_timer_reset()
 159  * serves no purpose.
 160  **/
 161 void
 162 g_timer_reset (GTimer *timer)
 163 {
 164   g_return_if_fail (timer != NULL);
 165
 166   timer->start = g_get_monotonic_time ();
 167 }
 168
 169 /**
 170  * g_timer_continue:
 171  * @timer: a #GTimer.
 172  *
 173  * Resumes a timer that has previously been stopped with
 174  * g_timer_stop(). g_timer_stop() must be called before using this
 175  * function.
 176  *
 177  * Since: 2.4
 178  **/
 179 void
 180 g_timer_continue (GTimer *timer)
 181 {
 182   guint64 elapsed;
 183
 184   g_return_if_fail (timer != NULL);
 185   g_return_if_fail (timer->active == FALSE);
 186
 187   /* Get elapsed time and reset timer start time
 188    *  to the current time minus the previously
 189    *  elapsed interval.
 190    */
 191
 192   elapsed = timer->end - timer->start;
 193
 194   timer->start = g_get_monotonic_time ();
 195
 196   timer->start -= elapsed;
 197
 198   timer->active = TRUE;
 199 }
 200
 201 /**
 202  * g_timer_elapsed:
 203  * @timer: a #GTimer.
 204  * @microseconds: return location for the fractional part of seconds
 205  *                elapsed, in microseconds (that is, the total number
 206  *                of microseconds elapsed, modulo 1000000), or %NULL
 207  * @Returns: seconds elapsed as a floating point value, including any
 208  *           fractional part.
 209  *
 210  * If @timer has been started but not stopped, obtains the time since
 211  * the timer was started. If @timer has been stopped, obtains the
 212  * elapsed time between the time it was started and the time it was
 213  * stopped. The return value is the number of seconds elapsed,
 214  * including any fractional part. The @microseconds out parameter is
 215  * essentially useless.
 216  *
 217  * <warning><para>
 218  *  Calling initialization functions, in particular g_thread_init(), while a
 219  *  timer is running will cause invalid return values from this function.
 220  * </para></warning>
 221  **/
 222 gdouble
 223 g_timer_elapsed (GTimer *timer,
 224                  gulong *microseconds)
 225 {
 226   gdouble total;
 227   gint64 elapsed;
 228
 229   g_return_val_if_fail (timer != NULL, 0);
 230
 231   if (timer->active)
 232     timer->end = g_get_monotonic_time ();
 233
 234   elapsed = timer->end - timer->start;
 235
 236   total = elapsed / 1e6;
 237
 238   if (microseconds)
 239     *microseconds = elapsed % 1000000;
 240
 241   return total;
 242 }
 243
 244 void
 245 g_usleep (gulong microseconds)
 246 {
 247 #ifdef G_OS_WIN32
 248   Sleep (microseconds / 1000);
 249 #else
 250   struct timespec request, remaining;
 251   request.tv_sec = microseconds / G_USEC_PER_SEC;
 252   request.tv_nsec = 1000 * (microseconds % G_USEC_PER_SEC);
 253   while (nanosleep (&request, &remaining) == -1 && errno == EINTR)
 254     request = remaining;
 255 #endif
 256 }
 257
 258 /**
 259  * g_time_val_add:
 260  * @time_: a #GTimeVal
 261  * @microseconds: number of microseconds to add to @time
 262  *
 263  * Adds the given number of microseconds to @time_. @microseconds can
 264  * also be negative to decrease the value of @time_.
 265  **/
 266 void
 267 g_time_val_add (GTimeVal *time_, glong microseconds)
 268 {
 269   g_return_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC);
 270
 271   if (microseconds >= 0)
 272     {
 273       time_->tv_usec += microseconds % G_USEC_PER_SEC;
 274       time_->tv_sec += microseconds / G_USEC_PER_SEC;
 275       if (time_->tv_usec >= G_USEC_PER_SEC)
 276        {
 277          time_->tv_usec -= G_USEC_PER_SEC;
 278          time_->tv_sec++;
 279        }
 280     }
 281   else
 282     {
 283       microseconds *= -1;
 284       time_->tv_usec -= microseconds % G_USEC_PER_SEC;
 285       time_->tv_sec -= microseconds / G_USEC_PER_SEC;
 286       if (time_->tv_usec < 0)
 287        {
 288          time_->tv_usec += G_USEC_PER_SEC;
 289          time_->tv_sec--;
 290        }
 291     }
 292 }
 293
 294 /* converts a broken down date representation, relative to UTC, to
 295  * a timestamp; it uses timegm() if it's available.
 296  */
 297 static time_t
 298 mktime_utc (struct tm *tm)
 299 {
 300   time_t retval;
 301
 302 #ifndef HAVE_TIMEGM
 303   static const gint days_before[] =
 304   {
 305     0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
 306   };
 307 #endif
 308
 309 #ifndef HAVE_TIMEGM
 310   if (tm->tm_mon < 0 || tm->tm_mon > 11)
 311     return (time_t) -1;
 312
 313   retval = (tm->tm_year - 70) * 365;
 314   retval += (tm->tm_year - 68) / 4;
 315   retval += days_before[tm->tm_mon] + tm->tm_mday - 1;
 316
 317   if (tm->tm_year % 4 == 0 && tm->tm_mon < 2)
 318     retval -= 1;
 319
 320   retval = ((((retval * 24) + tm->tm_hour) * 60) + tm->tm_min) * 60 + tm->tm_sec;
 321 #else
 322   retval = timegm (tm);
 323 #endif /* !HAVE_TIMEGM */
 324
 325   return retval;
 326 }
 327
 328 /**
 329  * g_time_val_from_iso8601:
 330  * @iso_date: an ISO 8601 encoded date string
 331  * @time_: a #GTimeVal
 332  *
 333  * Converts a string containing an ISO 8601 encoded date and time
 334  * to a #GTimeVal and puts it into @time_.
 335  *
 336  * Return value: %TRUE if the conversion was successful.
 337  *
 338  * Since: 2.12
 339  */
 340 gboolean
 341 g_time_val_from_iso8601 (const gchar *iso_date,
 342                          GTimeVal    *time_)
 343 {
 344   struct tm tm = {0};
 345   long val;
 346
 347   g_return_val_if_fail (iso_date != NULL, FALSE);
 348   g_return_val_if_fail (time_ != NULL, FALSE);
 349
 350   /* Ensure that the first character is a digit,
 351    * the first digit of the date, otherwise we don't
 352    * have an ISO 8601 date */
 353   while (g_ascii_isspace (*iso_date))
 354     iso_date++;
 355
 356   if (*iso_date == '\0')
 357     return FALSE;
 358
 359   if (!g_ascii_isdigit (*iso_date) && *iso_date != '-' && *iso_date != '+')
 360     return FALSE;
 361
 362   val = strtoul (iso_date, (char **)&iso_date, 10);
 363   if (*iso_date == '-')
 364     {
 365       /* YYYY-MM-DD */
 366       tm.tm_year = val - 1900;
 367       iso_date++;
 368       tm.tm_mon = strtoul (iso_date, (char **)&iso_date, 10) - 1;
 369
 370       if (*iso_date++ != '-')
 371         return FALSE;
 372
 373       tm.tm_mday = strtoul (iso_date, (char **)&iso_date, 10);
 374     }
 375   else
 376     {
 377       /* YYYYMMDD */
 378       tm.tm_mday = val % 100;
 379       tm.tm_mon = (val % 10000) / 100 - 1;
 380       tm.tm_year = val / 10000 - 1900;
 381     }
 382
 383   if (*iso_date != 'T')
 384     {
 385       /* Date only */
 386       if (*iso_date == '\0')
 387         return TRUE;
 388       return FALSE;
 389     }
 390
 391   iso_date++;
 392
 393   /* If there is a 'T' then there has to be a time */
 394   if (!g_ascii_isdigit (*iso_date))
 395     return FALSE;
 396
 397   val = strtoul (iso_date, (char **)&iso_date, 10);
 398   if (*iso_date == ':')
 399     {
 400       /* hh:mm:ss */
 401       tm.tm_hour = val;
 402       iso_date++;
 403       tm.tm_min = strtoul (iso_date, (char **)&iso_date, 10);
 404
 405       if (*iso_date++ != ':')
 406         return FALSE;
 407
 408       tm.tm_sec = strtoul (iso_date, (char **)&iso_date, 10);
 409     }
 410   else
 411     {
 412       /* hhmmss */
 413       tm.tm_sec = val % 100;
 414       tm.tm_min = (val % 10000) / 100;
 415       tm.tm_hour = val / 10000;
 416     }
 417
 418   time_->tv_usec = 0;
 419
 420   if (*iso_date == ',' || *iso_date == '.')
 421     {
 422       glong mul = 100000;
 423
 424       while (g_ascii_isdigit (*++iso_date))
 425         {
 426           time_->tv_usec += (*iso_date - '0') * mul;
 427           mul /= 10;
 428         }
 429     }
 430
 431   /* Now parse the offset and convert tm to a time_t */
 432   if (*iso_date == 'Z')
 433     {
 434       iso_date++;
 435       time_->tv_sec = mktime_utc (&tm);
 436     }
 437   else if (*iso_date == '+' || *iso_date == '-')
 438     {
 439       gint sign = (*iso_date == '+') ? -1 : 1;
 440
 441       val = strtoul (iso_date + 1, (char **)&iso_date, 10);
 442
 443       if (*iso_date == ':')
 444         val = 60 * val + strtoul (iso_date + 1, (char **)&iso_date, 10);
 445       else
 446         val = 60 * (val / 100) + (val % 100);
 447
 448       time_->tv_sec = mktime_utc (&tm) + (time_t) (60 * val * sign);
 449     }
 450   else
 451     {
 452       /* No "Z" or offset, so local time */
 453       tm.tm_isdst = -1; /* locale selects DST */
 454       time_->tv_sec = mktime (&tm);
 455     }
 456
 457   while (g_ascii_isspace (*iso_date))
 458     iso_date++;
 459
 460   return *iso_date == '\0';
 461 }
 462
 463 /**
 464  * g_time_val_to_iso8601:
 465  * @time_: a #GTimeVal
 466  *
 467  * Converts @time_ into an ISO 8601 encoded string, relative to the
 468  * Coordinated Universal Time (UTC).
 469  *
 470  * Return value: a newly allocated string containing an ISO 8601 date
 471  *
 472  * Since: 2.12
 473  */
 474 gchar *
 475 g_time_val_to_iso8601 (GTimeVal *time_)
 476 {
 477   gchar *retval;
 478   struct tm *tm;
 479 #ifdef HAVE_GMTIME_R
 480   struct tm tm_;
 481 #endif
 482   time_t secs;
 483
 484   g_return_val_if_fail (time_->tv_usec >= 0 && time_->tv_usec < G_USEC_PER_SEC, NULL);
 485
 486  secs = time_->tv_sec;
 487 #ifdef _WIN32
 488  tm = gmtime (&secs);
 489 #else
 490 #ifdef HAVE_GMTIME_R
 491   tm = gmtime_r (&secs, &tm_);
 492 #else
 493   tm = gmtime (&secs);
 494 #endif
 495 #endif
 496
 497   if (time_->tv_usec != 0)
 498     {
 499       /* ISO 8601 date and time format, with fractionary seconds:
 500        *   YYYY-MM-DDTHH:MM:SS.MMMMMMZ
 501        */
 502       retval = g_strdup_printf ("%4d-%02d-%02dT%02d:%02d:%02d.%06ldZ",
 503                                 tm->tm_year + 1900,
 504                                 tm->tm_mon + 1,
 505                                 tm->tm_mday,
 506                                 tm->tm_hour,
 507                                 tm->tm_min,
 508                                 tm->tm_sec,
 509                                 time_->tv_usec);
 510     }
 511   else
 512     {
 513       /* ISO 8601 date and time format:
 514        *   YYYY-MM-DDTHH:MM:SSZ
 515        */
 516       retval = g_strdup_printf ("%4d-%02d-%02dT%02d:%02d:%02dZ",
 517                                 tm->tm_year + 1900,
 518                                 tm->tm_mon + 1,
 519                                 tm->tm_mday,
 520                                 tm->tm_hour,
 521                                 tm->tm_min,
 522                                 tm->tm_sec);
 523     }
 524
 525   return retval;
 526 }