synchronoise

Changed

• SignalEvent and CountdownEvent have been updated to not use Mutexes internally
  • In the refactor, wait_timeout was changed to always wait for the full duration if the signal was never set, so the return value has been changed to reflect this. This is a breaking change
  • In the refactor, CountdownEvent was changed so that its counter is now is usize instead of an isize. Since it's an invalid state for the counter to be below zero, let's encode that in the type. This is a breaking change if you were directly using the counter value or its type before

Added

• CountdownEvent::guard and CountdownGuard, to provide scope-based increment/decrement
• WriterReaderPhaser, a primitive that allows multiple wait-free "writer critical sections" against a "reader phase flip" that waits for currently-active writers to finish
  • also the related structs PhaserCriticalSection and PhaserReadLock

Added

• CountdownEvent::wait_timeout, to wait but also have a timeout
• SignalEvent, a primitive that lets one or more threads wait for a signal from another one

add docs and doctest for CountdownEvent

Added

• CountdownEvent, a primitive that keeps a counter that allows you to block until it hits zero

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