Protect shared state

A mutex block performs a shared modification while holding the single critical-section lock of the Silex process.

func main() {
    var pending:int[] = []

    mutex {
        pending.append(42)
    }

    print(pending[0])
}

The lock is recursive: protected code may call a function that opens another mutex block. Silex releases it on every exit from the block, including return, break, continue, or recoverable try propagation.

There is deliberately no manual lock or unlock operation. The lexical scope of the block guarantees that an early exit cannot leave the lock held.

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