IABSD.fr/xenocara/lib/mesa/src/c11/time.h

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• Author : jsg
  Date : 2024-04-02 09:25:31
  Hash : 874d2ba3
  Message : Import Mesa 23.3.6

• lib/mesa/src/c11/time.h

• /*
   * Copyright 2022 Yonggang Luo
   * SPDX-License-Identifier: MIT
   *
   * C11 <time.h> emulation library
   */
  
  #ifndef C11_TIME_H_INCLUDED_
  #define C11_TIME_H_INCLUDED_
  
  #include <time.h>
  
  /*---------------------------- macros ---------------------------*/
  
  /* Refer to https://htmlpreview.github.io/?https://icube-forge.unistra.fr/icps/c23-library/-/raw/main/README.html#time_monotonic-time_active-time_thread_active */
  #if defined(TIME_UTC) && \
     defined(TIME_MONOTONIC) && \
     defined(TIME_ACTIVE) && \
     defined(TIME_THREAD_ACTIVE) && \
     defined(TIME_MONOTONIC_RAW)
  /* all needed time base is implemented */
  #else
  #define _TIMESPEC_GET_NEED_IMPL
  #endif
  
  #ifdef _TIMESPEC_GET_NEED_IMPL
  #undef TIME_UTC
  #undef TIME_MONOTONIC
  #undef TIME_ACTIVE
  #undef TIME_THREAD_ACTIVE
  #undef TIME_MONOTONIC_RAW
  /* c11 */
  #define TIME_UTC 1
  /* c23 */
  #define TIME_MONOTONIC 2
  #define TIME_ACTIVE 3
  #define TIME_THREAD_ACTIVE 4
  #define TIME_MONOTONIC_RAW 5
  #define timespec_get c23_timespec_get
  #endif
  
  #ifdef __cplusplus
  extern "C" {
  #endif
  
  /*---------------------------- types ----------------------------*/
  
  /*
   * On MINGW `struct timespec` present but `timespec_get` may not present;
   * On MSVC `struct timespec` and `timespec_get` present at the same time;
   * So detecting `HAVE_STRUCT_TIMESPEC` in meson script dynamically.
   */
  #ifndef HAVE_STRUCT_TIMESPEC
  struct timespec
  {
      time_t tv_sec;  // Seconds - >= 0
      long   tv_nsec; // Nanoseconds - [0, 999999999]
  };
  #endif
  
  /*-------------------------- functions --------------------------*/
  
  #if defined(_TIMESPEC_GET_NEED_IMPL)
  #define _TIMESPEC_GET_NEED_DECL
  #elif defined(__APPLE__) && defined(__cplusplus) && (__cplusplus < 201703L)
  /* On macOS, the guard for declaration of timespec_get is by
   * (defined(__cplusplus) && __cplusplus >= 201703L),
   * fix the declaration for C++14 and lower here
   */
  #define _TIMESPEC_GET_NEED_DECL
  #endif
  
  #ifdef _TIMESPEC_GET_NEED_DECL
  /*-------------------- 7.25.7 Time functions --------------------*/
  // 7.25.6.1
  int
  timespec_get(struct timespec *ts, int base);
  #undef _TIMESPEC_GET_NEED_DECL
  #endif
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif /* C11_TIME_H_INCLUDED_ */