[libcxx] [test] Split the TEST_HAS_SANITIZERS define into TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT

This makes its role clearer. It's plausible that one may want to manually
define TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT when running the tests in
some environments - in particular, it seems to be necessary to use the
higher tolerance timeouts if running the tests on Windows runners
on Github Actions.

Also add the descriptive comment in one file where it was missing.

Differential Revision: https://reviews.llvm.org/D131484

libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.cons/mutex.pass.cpp

@@ -42,7 +42,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(50);
 #else
 ms Tolerance = ms(50 * 5);

libcxx/test/std/thread/thread.mutex/thread.lock/thread.lock.shared/thread.lock.shared.locking/lock.pass.cpp

@@ -41,7 +41,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(25);
 #else
 ms Tolerance = ms(25 * 5);

libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock.pass.cpp

@@ -41,7 +41,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(50);
 #else
 ms Tolerance = ms(50 * 5);

libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.shared_mutex.requirements/thread.shared_mutex.class/lock_shared.pass.cpp

@@ -42,7 +42,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(50);
 #else
 ms Tolerance = ms(50 * 5);

libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_for.pass.cpp

@@ -42,7 +42,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(50);
 #else
 ms Tolerance = ms(50 * 5);

libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared.pass.cpp

@@ -38,7 +38,10 @@ typedef std::chrono::milliseconds ms;
 typedef std::chrono::nanoseconds ns;
 
 
-#if !defined(TEST_HAS_SANITIZERS)
+// Thread sanitizer causes more overhead and will sometimes cause this test
+// to fail. To prevent this we give Thread sanitizer more time to complete the
+// test.
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(200);
 #else
 ms Tolerance = ms(200 * 5);

libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_shared_for.pass.cpp

@@ -43,7 +43,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(50);
 #else
 ms Tolerance = ms(50 * 5);

libcxx/test/std/thread/thread.mutex/thread.mutex.requirements/thread.sharedtimedmutex.requirements/thread.sharedtimedmutex.class/try_lock_until.pass.cpp

@@ -43,7 +43,7 @@ ms WaitTime = ms(250);
 // Thread sanitizer causes more overhead and will sometimes cause this test
 // to fail. To prevent this we give Thread sanitizer more time to complete the
 // test.
-#if !defined(TEST_HAS_SANITIZERS)
+#if !defined(TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT)
 ms Tolerance = ms(50);
 #else
 ms Tolerance = ms(50 * 5);

libcxx/test/support/test_macros.h

@@ -193,6 +193,7 @@
 #if TEST_HAS_FEATURE(address_sanitizer) || TEST_HAS_FEATURE(hwaddress_sanitizer) || \
     TEST_HAS_FEATURE(memory_sanitizer) || TEST_HAS_FEATURE(thread_sanitizer)
 #define TEST_HAS_SANITIZERS
+#define TEST_IS_EXECUTED_IN_A_SLOW_ENVIRONMENT
 #endif
 
 #if defined(_LIBCPP_NORETURN)