async-mutex

This is a full rewrite of the core implementation.

• Allow negative values for semaphores.
• Allow weights for semaphore.acquire and semaphore.runExclusive. A waiter will be dispatched once the value of the semaphore is greater or equal to its weight.
• Add semaphore.getValue and semaphore.setValue.
• Allow weights for semaphore.waitForUnlock. The promise will only resolve once the value of the semaphore is greater or equal to its weight.
• Only resolve waitForUnlock once no waiters remain (fixes #52).
• waitForUnlock times out if the withTimeout decorator is used.

• Add waitForUnlock for waiting until a mutex/semaphore is free for locking, thanks to Jason Gore.

Changelog, bump version.

• Deprecate Mutex::release / Semaphore::release and remove them from the documentation. The methods are still available in 0.3.x, but will be removed in 0.4.0.

  I don't like breaking existing APIs, but using those methods is inherently dangerous as they can accidentally release locks acquired in a completely different place. Furthermore, they are mostly useless for semaphores. I consider adding them an unfortunate mistake on my end.

  A safe alternative is the usage of runExclusive which allows to execute blocks exclusively and automatically manages acquiring and releasing the mutex or semaphore.

• Add Mutex::cancel / Semaphore::cancel for rejecting all currently pending locks.

• Add tryAcquire decorator for lock-or-fail semantics.

• Fix a nasty bug related to consecutive calls to Mutex::release.

• Nothing new thanks to NPM. Go away. Install 0.2.6.

Forbid Semaphore::release for concurrency > 1, documentation, bump ve…

Changelog, bump version.

• Improve compatibility with older versions of node 13, thanks to @josemiguelmelo

• Remove sourcemaps

• Add a Semaphore, reimplement Mutex on top of it
• Add a withTimeout decorator that limits the time the program waits for the mutex or semaphore to become available
• Support native ES6 imports on Node >= 12
• Provide an ES6 module entrypoint for ES6 aware bundlers
• Dependency bump
• Switch from TSlint to ESlint
• Enable code coverage in tests

• Documentation updates (thanks to hmil and 0xflotus)
• Update build dependencies

• Move deps to devDependencies (thanks to Meirion Hughes for the PR)
• Upgrade deps

• Move to yarn
• Add tslint
• Switch tests to use ES6
• Add isLocked()

• Fix documentation for acquire

• Initial release