libc/test/src/time/clock_gettime_test.cpp

   1 //===-- Unittests for clock_gettime ---------------------------------------===//
   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 #include "hdr/time_macros.h"
  10 #include "hdr/types/struct_timespec.h"
  11 #include "hdr/types/time_t.h"
  12 #include "src/__support/macros/properties/architectures.h"
  13 #include "src/time/clock_gettime.h"
  14 #include "test/UnitTest/Test.h"
  15
  16 TEST(LlvmLibcClockGetTime, RealTime) {
  17   timespec tp;
  18   int result;
  19   result = LIBC_NAMESPACE::clock_gettime(CLOCK_REALTIME, &tp);
  20   // The GPU does not implement CLOCK_REALTIME but provides it so programs will
  21   // compile.
  22 #ifdef LIBC_TARGET_ARCH_IS_GPU
  23   ASSERT_EQ(result, -1);
  24 #else
  25   ASSERT_EQ(result, 0);
  26   ASSERT_GT(tp.tv_sec, time_t(0));
  27 #endif
  28 }
  29
  30 #ifdef CLOCK_MONOTONIC
  31 TEST(LlvmLibcClockGetTime, MonotonicTime) {
  32   timespec tp1, tp2;
  33   int result;
  34   result = LIBC_NAMESPACE::clock_gettime(CLOCK_MONOTONIC, &tp1);
  35   ASSERT_EQ(result, 0);
  36   ASSERT_GT(tp1.tv_sec, time_t(0));
  37   result = LIBC_NAMESPACE::clock_gettime(CLOCK_MONOTONIC, &tp2);
  38   ASSERT_EQ(result, 0);
  39   ASSERT_GE(tp2.tv_sec, tp1.tv_sec); // The monotonic clock should increase.
  40   if (tp2.tv_sec == tp1.tv_sec) {
  41     ASSERT_GE(tp2.tv_nsec, tp1.tv_nsec);
  42   }
  43 }
  44 #endif // CLOCK_MONOTONIC