Reduce flake in pthread mutex timed lock tests.
Given that the POSIX APIs use absolute times rather than relative times, we need to allow for some variance. 0.01s is traditional in our tests.
Also break the pthread_mutex_clocklock test in two, so it's obvious from a gtest failure which clock was in use (since gtest doesn't give you stack traces, and the actual testing is done in a helper function).
Bug: http://b/376769706
Change-Id: I264e4d0fccb606cf9fde24a1f6da52a51b8a8f68
diff --git a/libc/private/bionic_constants.h b/libc/private/bionic_constants.h
index 6274fe2..ce484d8 100644
--- a/libc/private/bionic_constants.h
+++ b/libc/private/bionic_constants.h
@@ -16,6 +16,7 @@
#pragma once
+#define US_PER_S 1'000'000LL
#define NS_PER_S 1'000'000'000LL
// Size of the shadow call stack. This can be small because these stacks only