R Under development (unstable) (2024-02-24 r85984 ucrt) -- "Unsuffered Consequences"
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> ## Reported by Duncan Murdoch (from StackOverflow) 2021-02-04
> 
> library(survival)
> library(boot)

Attaching package: 'boot'

The following object is masked from 'package:survival':

    aml

> statMeanSurv <- function(data, var) {
+     surv <- survfit(Surv(time, cens) ~ 1, data = data)
+     mean(surv$surv) + var
+ }
> ## both have datasets aml
> res <- censboot(boot::aml, statMeanSurv, R = 5L, var = 1,
+                 parallel = "multicore", ncpus = 2L)
> res$t
         [,1]
[1,] 1.544125
[2,] 1.466356
[3,] 1.489734
[4,] 1.494918
[5,] 1.551952
> 
> proc.time()
   user  system elapsed 
   0.96    0.07    1.03