Wait until a condition is met — wait

Block the current runtime until the expression returns TRUE.

wait_until(
  expr,
  envir = parent.frame(),
  timeout = Inf,
  interval = 0.1,
  later_run_now = TRUE
)

Arguments

expr: an expression to check, supports quasiquotation.
envir: the environment in which the expression is to be evaluated.
timeout: raise an error if this amount of time in second has passed.
interval: delay between retries.
later_run_now: execute later::run_now() periodically later is loaded?

Examples


s <- Sys.time()
system.time(wait_until(Sys.time() - s > 1))
#>    user  system elapsed 
#>   0.005   0.001   1.041 

z <- 0
later::later(function() z <<- 1, 1)
wait_until(z == 1)
z == 1
#> [1] TRUE