Import std.concurrent.locks

Once

std.concurrent.locks

class

Public Shared Class Once

Work that runs one time: the first Do runs it, and every other, at once or after, on any thread, returns once it has run.

Examples

Global runs = Atomic<Int>(0)
Const setup = Once()

Function CountRun()
    runs.Add(1)
End Function

Parallel For i = 0 Until 8
    setup.Do(CountRun)
End For

Expect(runs.Load() == 1 && setup.IsDone)

std/concurrent/locks.fb, line 241

Public New() constructor #

A new Once, whose work hasn't run.
@PanicsAtCaller Public Method Do(work: Func()) method #

Runs work, unless a Do has, waiting while another thread's Do runs it. Panics in a Do that the work itself calls, which would wait for itself forever.
Public Property IsDone: Bool property #

Whether the work has run.

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