std: refactor `pthread`-based synchronization The non-trivial code for `pthread_condvar` is duplicated across the thread parking and the `Mutex`/`Condvar` implementations. This PR moves that code into `sys::pal`, which now exposes an `unsafe` wrapper type for `pthread_mutex_t` and `pthread_condvar_t`. |
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|---|---|---|
| .. | ||
| condvar | ||
| mutex | ||
| once | ||
| rwlock | ||
| thread_parking | ||
| mod.rs | ||
| once_box.rs | ||