Add user-defined clock to libstdc++ condition_variable tests

2019-09-04  Mike Crowe  <mac@mcrowe.com>

	* testsuite/30_threads/condition_variable/members/2.cc (test01):
	Parameterise so that test can be run against an arbitrary clock.
	(main): Test using std::chrono::steady_clock and a user-defined
	clock in addition to the previous std::chrono::system_clock.
	* testsuite/30_threads/condition_variable_any/members/2.cc: Likewise.

From-SVN: r275389

3 files changed, 69 insertions, 8 deletions

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index b130f0f..678706d 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,11 @@
+2019-09-04  Mike Crowe  <mac@mcrowe.com>
+
+	* testsuite/30_threads/condition_variable/members/2.cc (test01):
+	Parameterise so that test can be run against an arbitrary clock.
+	(main): Test using std::chrono::steady_clock and a user-defined
+	clock in addition to the previous std::chrono::system_clock.
+	* testsuite/30_threads/condition_variable_any/members/2.cc: Likewise.
+
 2019-09-03  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* crossconfig.m4: Remove references to spu.
diff --git a/libstdc++-v3/testsuite/30_threads/condition_variable/members/2.cc b/libstdc++-v3/testsuite/30_threads/condition_variable/members/2.cc
index 0ecb09d..cbac3fa 100644
--- a/libstdc++-v3/testsuite/30_threads/condition_variable/members/2.cc
+++ b/libstdc++-v3/testsuite/30_threads/condition_variable/members/2.cc
@@ -26,6 +26,7 @@
 #include <system_error>
 #include <testsuite_hooks.h>
 
+template <typename ClockType>
 void test01()
 {
   try 
@@ -35,10 +36,10 @@ void test01()
       std::mutex m;
       std::unique_lock<std::mutex> l(m);
 
-      auto then = std::chrono::steady_clock::now();
+      auto then = ClockType::now();
       std::cv_status result = c1.wait_until(l, then + ms);
       VERIFY( result == std::cv_status::timeout );
-      VERIFY( (std::chrono::steady_clock::now() - then) >= ms );
+      VERIFY( (ClockType::now() - then) >= ms );
       VERIFY( l.owns_lock() );
     }
   catch (const std::system_error& e)
@@ -102,9 +103,39 @@ void test01_alternate_clock()
     }
 }
 
+/* User defined clock that ticks in two-thousandths of a second
+   forty-two minutes ahead of steady_clock. */
+struct user_defined_clock
+{
+  typedef std::chrono::steady_clock::rep rep;
+  typedef std::ratio<1, 2000> period;
+  typedef std::chrono::duration<rep, period> duration;
+  typedef std::chrono::time_point<user_defined_clock> time_point;
+
+  static constexpr bool is_steady = true;
+
+  static time_point now() noexcept
+  {
+    using namespace std::chrono;
+    const auto steady_since_epoch = steady_clock::now().time_since_epoch();
+    const auto user_since_epoch = duration_cast<duration>(steady_since_epoch);
+    return time_point(user_since_epoch + minutes(42));
+  }
+};
+
+/*
+It's not possible for this test to automatically ensure that the
+system_clock test cases result in a wait on CLOCK_REALTIME and steady_clock
+test cases result in a wait on CLOCK_MONOTONIC. It's recommended to run the
+test under strace(1) and check whether the expected futex calls are made by
+glibc. See https://gcc.gnu.org/ml/libstdc++/2019-09/msg00022.html for
+instructions.
+*/
+
 int main()
 {
-  test01();
+  test01<std::chrono::steady_clock>();
+  test01<std::chrono::system_clock>();
+  test01<user_defined_clock>();
   test01_alternate_clock();
-  return 0;
 }
diff --git a/libstdc++-v3/testsuite/30_threads/condition_variable_any/members/2.cc b/libstdc++-v3/testsuite/30_threads/condition_variable_any/members/2.cc
index e6fbc44..897fa86 100644
--- a/libstdc++-v3/testsuite/30_threads/condition_variable_any/members/2.cc
+++ b/libstdc++-v3/testsuite/30_threads/condition_variable_any/members/2.cc
@@ -51,6 +51,7 @@ struct Mutex
 };
 
 
+template <typename ClockType>
 void test01()
 {
   try 
@@ -60,10 +61,10 @@ void test01()
       Mutex m;
       m.lock();
 
-      auto then = std::chrono::steady_clock::now();
+      auto then = ClockType::now();
       std::cv_status result = c1.wait_until(m, then + ms);
       VERIFY( result == std::cv_status::timeout );
-      VERIFY( (std::chrono::steady_clock::now() - then) >= ms );
+      VERIFY( (ClockType::now() - then) >= ms );
       VERIFY( m.locked );
     }
   catch (const std::system_error& e)
@@ -76,8 +77,29 @@ void test01()
     }
 }
 
+/* User defined clock that ticks in two-thousandths of a second
+   forty-two minutes ahead of steady_clock. */
+struct user_defined_clock
+{
+  typedef std::chrono::steady_clock::rep rep;
+  typedef std::ratio<1, 2000> period;
+  typedef std::chrono::duration<rep, period> duration;
+  typedef std::chrono::time_point<user_defined_clock> time_point;
+
+  static constexpr bool is_steady = true;
+
+  static time_point now() noexcept
+  {
+    using namespace std::chrono;
+    const auto steady_since_epoch = steady_clock::now().time_since_epoch();
+    const auto user_since_epoch = duration_cast<duration>(steady_since_epoch);
+    return time_point(user_since_epoch + minutes(42));
+  }
+};
+
 int main()
 {
-  test01();
-  return 0;
+  test01<std::chrono::steady_clock>();
+  test01<std::chrono::system_clock>();
+  test01<user_defined_clock>();
 }