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This introduces a new internal utility, std::__condvar, which is a simplified form of std::condition_variable. It has no dependency on <chrono> or std::unique_lock, which allows it to be used in <bits/atomic_wait.h>. This avoids repeating the #ifdef __GTHREAD_COND_INIT preprocessor conditions and associated logic for initializing a __gthread_cond_t correctly. It also encapsulates most of the __gthread_cond_xxx functions as member functions of __condvar. libstdc++-v3/ChangeLog: * include/bits/atomic_timed_wait.h (__cond_wait_until_impl): Do not define when _GLIBCXX_HAVE_LINUX_FUTEX is defined. Use __condvar and mutex instead of __gthread_cond_t and unique_lock<mutex>. (__cond_wait_until): Likewise. Fix test for return value of __cond_wait_until_impl. (__timed_waiters::_M_do_wait_until): Use __condvar instead of __gthread_cond_t. * include/bits/atomic_wait.h: Remove <bits/unique_lock.h> include. Only include <bits/std_mutex.h> if not using futexes. (__platform_wait_max_value): Remove unused variable. (__waiters::lock_t): Use lock_guard instead of unique_lock. (__waiters::_M_cv): Use __condvar instead of __gthread_cond_t. (__waiters::_M_do_wait(__platform_wait_t)): Likewise. (__waiters::_M_notify()): Likewise. Use notify_one() if not asked to notify all. * include/bits/std_mutex.h (__condvar): New type. * include/std/condition_variable (condition_variable::_M_cond) (condition_variable::wait_until): Use __condvar instead of __gthread_cond_t. * src/c++11/condition_variable.cc (condition_variable): Define default constructor and destructor as defaulted. (condition_variable::wait, condition_variable::notify_one) (condition_variable::notify_all): Forward to corresponding member function of __condvar.
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