Get the process ID (PID) of the most recent main R process to orchestrate the targets of the current project.
Usage
tar_pid(store = targets::tar_config_get("store"))
Arguments
- store
Character of length 1, path to the
targets
data store. Defaults totar_config_get("store")
, which in turn defaults to_targets/
. When you set this argument, the value oftar_config_get("store")
is temporarily changed for the current function call. Seetar_config_get()
andtar_config_set()
for details about how to set the data store path persistently for a project.
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_crew()
,
tar_process()
Examples
if (identical(Sys.getenv("TAR_EXAMPLES"), "true")) { # for CRAN
tar_dir({ # tar_dir() runs code from a temp dir for CRAN.
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.
})
}