Add regress test for futexes in shared anonymous memory.ok mpi@
Adjust futex regress test since futex(2) now returns -1 on error and setserrno like any normal syscall.ok mpi@, bluhm@
Add test cases for private versus non-private futexes.While here, fix timeout handling in futex_twait(), and fix the returnvalue of functions awakener() and signaled().OK mpi@
Check that unsupported operation returns ENOSYS.
Regression tests for futex(2).