Synchronous compute profiles

[shikokuchuo]

Closes #435. For evaluating mirai in the current process. Enables use of browser() for interactive debugging.

daemons(sync = TRUE) sets synchronous evaluation for a given compute profile.

E.g.:

library(mirai)
daemons(sync = TRUE)
m <- mirai(
  {
    browser()
  },
  .args = list(x = 1)
)
daemons(0)

Would drop us into a browser instance with access to x.

Each mirai is evaluated separately so it works for mirai_map() etc. regardless of the number of evaluations.

library(mirai)
daemons(sync = TRUE, .compute = "sync")
with_daemons("sync", {
  mp <- mirai_map(1:3, \(x) Sys.getpid())
})
daemons(0, .compute = "sync")
mp[]
#> [[1]]
#> [1] 32155
#> 
#> [[2]]
#> [1] 32155
#> 
#> [[3]]
#> [1] 32155

^{Created on 2025-09-10 with reprex v2.1.1}