src/systime.h

   1 /* systime.h - System-dependent definitions for time manipulations.
   2    Copyright (C) 1993, 1994, 2002, 2003, 2004,
   3                  2005, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef EMACS_SYSTIME_H
  21 #define EMACS_SYSTIME_H
  22
  23 #ifdef TIME_WITH_SYS_TIME
  24 #include <sys/time.h>
  25 #include <time.h>
  26 #else
  27 #ifdef HAVE_SYS_TIME_H
  28 #include <sys/time.h>
  29 #else
  30 #include <time.h>
  31 #endif
  32 #endif
  33
  34 #ifdef HAVE_TZNAME
  35 #ifndef tzname          /* For SGI.  */
  36 extern char *tzname[];  /* RS6000 and others want it this way.  */
  37 #endif
  38 #endif
  39
  40 /* SVr4 doesn't actually declare this in its #include files.  */
  41 #ifdef USG5_4
  42 extern time_t timezone;
  43 #endif
  44
  45 /* On some configurations (hpux8.0, X11R4), sys/time.h and X11/Xos.h
  46    disagree about the name of the guard symbol.  */
  47 #ifdef HPUX
  48 #ifdef _STRUCT_TIMEVAL
  49 #ifndef __TIMEVAL__
  50 #define __TIMEVAL__
  51 #endif
  52 #endif
  53 #endif
  54 \f
  55 /* EMACS_TIME is the type to use to represent temporal intervals -
  56    struct timeval on some systems, int on others.  It can be passed as
  57    the timeout argument to the select  system call.
  58
  59    EMACS_SECS (TIME) is an rvalue for the seconds component of TIME.
  60    EMACS_SET_SECS (TIME, SECONDS) sets that to SECONDS.
  61
  62    EMACS_HAS_USECS is defined if EMACS_TIME has a usecs component.
  63    EMACS_USECS (TIME) is an rvalue for the microseconds component of TIME.
  64         This returns zero if EMACS_TIME doesn't have a microseconds component.
  65    EMACS_SET_USECS (TIME, MICROSECONDS) sets that to MICROSECONDS.
  66         This does nothing if EMACS_TIME doesn't have a microseconds component.
  67
  68    EMACS_SET_SECS_USECS (TIME, SECS, USECS) sets both components of TIME.
  69
  70    EMACS_GET_TIME (TIME) stores the current system time in TIME, which
  71         should be an lvalue.
  72
  73    EMACS_ADD_TIME (DEST, SRC1, SRC2) adds SRC1 to SRC2 and stores the
  74         result in DEST.  SRC should not be negative.
  75
  76    EMACS_SUB_TIME (DEST, SRC1, SRC2) subtracts SRC2 from SRC1 and
  77         stores the result in DEST.  SRC should not be negative.
  78    EMACS_TIME_NEG_P (TIME) is true if TIME is negative.
  79
  80 */
  81
  82 #ifdef HAVE_TIMEVAL
  83
  84 #define EMACS_HAS_USECS
  85
  86 #define EMACS_TIME struct timeval
  87 #define EMACS_SECS(time)                    ((time).tv_sec  + 0)
  88 #define EMACS_USECS(time)                   ((time).tv_usec + 0)
  89 #define EMACS_SET_SECS(time, seconds)       ((time).tv_sec  = (seconds))
  90 #define EMACS_SET_USECS(time, microseconds) ((time).tv_usec = (microseconds))
  91
  92 /* On SVR4, the compiler may complain if given this extra BSD arg.  */
  93 #ifdef GETTIMEOFDAY_ONE_ARGUMENT
  94 #define EMACS_GET_TIME(time) gettimeofday (&(time))
  95 #else /* not GETTIMEOFDAY_ONE_ARGUMENT */
  96 /* Presumably the second arg is ignored.  */
  97 #define EMACS_GET_TIME(time) gettimeofday (&(time), NULL)
  98 #endif /* not GETTIMEOFDAY_ONE_ARGUMENT */
  99
 100 #define EMACS_ADD_TIME(dest, src1, src2)                \
 101   do {                                                  \
 102     (dest).tv_sec  = (src1).tv_sec  + (src2).tv_sec;    \
 103     (dest).tv_usec = (src1).tv_usec + (src2).tv_usec;   \
 104     if ((dest).tv_usec > 1000000)                       \
 105       (dest).tv_usec -= 1000000, (dest).tv_sec++;       \
 106   } while (0)
 107
 108 #define EMACS_SUB_TIME(dest, src1, src2)                \
 109   do {                                                  \
 110     (dest).tv_sec  = (src1).tv_sec  - (src2).tv_sec;    \
 111     (dest).tv_usec = (src1).tv_usec - (src2).tv_usec;   \
 112     if ((dest).tv_usec < 0)                             \
 113       (dest).tv_usec += 1000000, (dest).tv_sec--;       \
 114   } while (0)
 115
 116 #define EMACS_TIME_NEG_P(time)                                  \
 117   ((long)(time).tv_sec < 0                                      \
 118    || ((time).tv_sec == 0                                       \
 119        && (long)(time).tv_usec < 0))
 120
 121 #else /* ! defined (HAVE_TIMEVAL) */
 122
 123 #define EMACS_TIME int
 124 #define EMACS_SECS(time)                    (time)
 125 #define EMACS_USECS(time)                   0
 126 #define EMACS_SET_SECS(time, seconds)       ((time) = (seconds))
 127 #define EMACS_SET_USECS(time, usecs)        0
 128
 129 #define EMACS_GET_TIME(t) ((t) = time ((long *) 0))
 130 #define EMACS_ADD_TIME(dest, src1, src2) ((dest) = (src1) + (src2))
 131 #define EMACS_SUB_TIME(dest, src1, src2) ((dest) = (src1) - (src2))
 132 #define EMACS_TIME_NEG_P(t) ((t) < 0)
 133
 134 #endif /* ! defined (HAVE_TIMEVAL) */
 135
 136 #define EMACS_SET_SECS_USECS(time, secs, usecs)                 \
 137   (EMACS_SET_SECS (time, secs), EMACS_SET_USECS (time, usecs))
 138
 139 extern int set_file_times __P ((const char *, EMACS_TIME, EMACS_TIME));
 140
 141 /* defined in keyboard.c */
 142 extern void set_waiting_for_input __P ((EMACS_TIME *));
 143
 144 /* When lisp.h is not included Lisp_Object is not defined (this can
 145    happen when this files is used outside the src directory).
 146    Use GCPRO1 to determine if lisp.h was included.  */
 147 #ifdef GCPRO1
 148 /* defined in dired.c */
 149 extern Lisp_Object make_time __P ((time_t));
 150 #endif
 151
 152 /* Compare times T1 and T2.  Value is 0 if T1 and T2 are the same.
 153    Value is < 0 if T1 is less than T2.  Value is > 0 otherwise.  (Cast
 154    to long is for those platforms where time_t is an unsigned
 155    type, and where otherwise T1 will always be grater than T2.)  */
 156
 157 #define EMACS_TIME_CMP(T1, T2)                          \
 158   ((long)EMACS_SECS (T1) - (long)EMACS_SECS (T2)        \
 159    + (EMACS_SECS (T1) == EMACS_SECS (T2)                \
 160       ? EMACS_USECS (T1) - EMACS_USECS (T2)             \
 161       : 0))
 162
 163 /* Compare times T1 and T2 for equality, inequality etc.  */
 164
 165 #define EMACS_TIME_EQ(T1, T2) (EMACS_TIME_CMP (T1, T2) == 0)
 166 #define EMACS_TIME_NE(T1, T2) (EMACS_TIME_CMP (T1, T2) != 0)
 167 #define EMACS_TIME_GT(T1, T2) (EMACS_TIME_CMP (T1, T2) > 0)
 168 #define EMACS_TIME_GE(T1, T2) (EMACS_TIME_CMP (T1, T2) >= 0)
 169 #define EMACS_TIME_LT(T1, T2) (EMACS_TIME_CMP (T1, T2) < 0)
 170 #define EMACS_TIME_LE(T1, T2) (EMACS_TIME_CMP (T1, T2) <= 0)
 171
 172 #endif /* EMACS_SYSTIME_H */
 173
 174 /* arch-tag: dcb79915-cf99-4bce-9778-aade71d07651
 175    (do not change this comment) */