Condition variable's wait_for and wait_until method does not unlock the mutex when the thread is blocking

[张华]

I'm building with clang-newlib. When I tried to use condition variable's wait_until and wait_for method, I noticed that both of them don't unlock the mutex when the thread is blocked. As a result, other threads waiting for the lock can't proceed. Anyone else has met similar issue?

[Ben Smith]

What condition variable class are you using? AFAIK, NaCl just provides pthread condition variables, which don't have that API. You can see it unlock the mutex here, in the source: https://chromium.googlesource.com/native_client/src/native_client/+/master/src/untrusted/pthread/nc_condvar.c#90