libc/include/llvm-libc-macros/linux/sys-time-macros.h

   1 //===-- Definition of macros from sys/time.h ------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
  10 #define LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H
  11
  12 // Add two timevals and put the result in timeval_ptr_result. If the resulting
  13 // usec value is greater than 999,999 then the microseconds are turned into full
  14 // seconds (1,000,000 is subtracted from usec and 1 is added to sec).
  15 #define timeradd(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
  16   (timeval_ptr_result)->tv_sec =                                               \
  17       (timeval_ptr_a)->tv_sec + (timeval_ptr_b)->tv_sec +                      \
  18       (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000 ? 1    \
  19                                                                         : 0);  \
  20   (timeval_ptr_result)->tv_usec =                                              \
  21       (timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec -                    \
  22       (((timeval_ptr_a)->tv_usec + (timeval_ptr_b)->tv_usec) >= 1000000        \
  23            ? 1000000                                                           \
  24            : 0);
  25
  26 // Subtract two timevals and put the result in timeval_ptr_result. If the
  27 // resulting usec value is less than 0 then 1,000,000 is added to usec and 1 is
  28 // subtracted from sec.
  29 #define timersub(timeval_ptr_a, timeval_ptr_b, timeval_ptr_result)             \
  30   (timeval_ptr_result)->tv_sec =                                               \
  31       (timeval_ptr_a)->tv_sec - (timeval_ptr_b)->tv_sec -                      \
  32       (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1 : 0);     \
  33   (timeval_ptr_result)->tv_usec =                                              \
  34       (timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec +                    \
  35       (((timeval_ptr_a)->tv_usec - (timeval_ptr_b)->tv_usec) < 0 ? 1000000     \
  36                                                                  : 0);
  37
  38 // Reset a timeval to the epoch.
  39 #define timerclear(timeval_ptr)                                                \
  40   (timeval_ptr)->tv_sec = 0;                                                   \
  41   (timeval_ptr)->tv_usec = 0;
  42
  43 // Determine if a timeval is set to the epoch.
  44 #define timerisset(timeval_ptr)                                                \
  45   (timeval_ptr)->tv_sec != 0 || (timeval_ptr)->tv_usec != 0;
  46
  47 // Compare two timevals using CMP.
  48 #define timercmp(timeval_ptr_a, timeval_ptr_b, CMP)                            \
  49   (((timeval_ptr_a)->tv_sec == (timeval_ptr_b)->tv_sec)                        \
  50        ? ((timeval_ptr_a)->tv_usec CMP(timeval_ptr_b)->tv_usec)                \
  51        : ((timeval_ptr_a)->tv_sec CMP(timeval_ptr_b)->tv_sec))
  52
  53 #endif // LLVM_LIBC_MACROS_LINUX_SYS_TIME_MACROS_H