Fix ThreadCPUUsage when running on RTEMS. (#414)

Change ThreadCPUUsage to call ProcessCPUUsage if __rtems__ is defined. RTEMS real time OS doesn't support CLOCK_THREAD_CPUTIME_ID. See https://github.com/RTEMS/rtems/blob/master/cpukit/posix/src/clockgettime.c#L58-L59 Prior to this change, ThreadCPUUsage would fail when running on RTEMS with: ERROR: clock_gettime(CLOCK_THREAD_CPUTIME_ID, ...) failed

Fix ThreadCPUUsage when running on RTEMS. (#414)
ee3cfca6 · Tom Madams · Dominic Hamon · 9d4b719d · ee3cfca6 · ee3cfca6
Commit ee3cfca6 authored Jul 06, 2017 by Tom Madams Committed by Dominic Hamon Jul 06, 2017
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CONTRIBUTORS CONTRIBUTORS +1 -0

internal_macros.h src/internal_macros.h +2 -0

timers.cc src/timers.cc +4 -0

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--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -51,6 +51,7 @@ Pierre Phaneuf <pphaneuf@google.com>
 Radoslav Yovchev <radoslav.tm@gmail.com>
 Ray Glover <ray.glover@uk.ibm.com>
 Shuo Chen <chenshuo@chenshuo.com>
+Tom Madams <tom.ej.madams@gmail.com> <tmadams@google.com>
 Yixuan Qiu <yixuanq@gmail.com>
 Yusuke Suzuki <utatane.tea@gmail.com>
 Tobias Ulvgård <tobias.ulvgard@dirac.se>

--- a/src/internal_macros.h
+++ b/src/internal_macros.h
@@ -45,6 +45,8 @@
 #define BENCHMARK_OS_NACL 1
 #elif defined(EMSCRIPTEN)
 #define BENCHMARK_OS_EMSCRIPTEN 1
+#elif defined(__rtems__)
+#define BENCHMARK_OS_RTEMS 1
 #endif

 #if !__has_feature(cxx_exceptions) && !defined(__cpp_exceptions) \

--- a/src/timers.cc
+++ b/src/timers.cc
@@ -158,6 +158,10 @@ double ThreadCPUUsage() {
 #elif defined(BENCHMARK_OS_EMSCRIPTEN)
  // Emscripten doesn't support traditional threads
  return ProcessCPUUsage();
+#elif defined(BENCHMARK_OS_RTEMS)
+  // RTEMS doesn't support CLOCK_THREAD_CPUTIME_ID. See
+  // https://github.com/RTEMS/rtems/blob/master/cpukit/posix/src/clockgettime.c
+  return ProcessCPUUsage();
 #elif defined(CLOCK_THREAD_CPUTIME_ID)
  struct timespec ts;
  if (clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts) == 0) return MakeTime(ts);