targets (version 0.4.1)

tar_pid: Get main process ID.

Description

Get the process ID (PID) of the most recent main R process to orchestrate the targets of the current project.

Usage

tar_pid()

Value

Integer with the process ID (PID) of the most recent main R process to orchestrate the targets of the current project.

Details

The main process is the R process invoked by tar_make() or similar. If callr_function is not NULL, this is an external process, and the pid in the return value will not agree with Sys.getpid() in your current interactive session. The process may or may not be alive. You may want to check it with ps::ps_is_running(ps::ps_handle(targets::tar_pid())) before running another call to tar_make() for the same project.

See Also

Other data: tar_load_raw(), tar_load(), tar_meta(), tar_objects(), tar_process(), tar_read_raw(), tar_read()

Examples

# NOT RUN {
if (identical(Sys.getenv("TAR_LONG_EXAMPLES"), "true")) {
tar_dir({ # tar_dir() runs code from a temporary directory.
tar_script({
  list(
    tar_target(x, seq_len(2)),
    tar_target(y, 2 * x, pattern = map(x))
  )
}, ask = FALSE)
tar_make()
Sys.getpid()
tar_pid() # Different from the current PID.
})
}
# }