uid {interprocess} | R Documentation |
Generate Names
Description
To ensure broad compatibility across different operating systems, names of
mutexes, semaphores, and message queues should start with a letter followed
by up to 249 alphanumeric characters. These functions generate names meeting
these requirements.
-
uid()
: 11-character encoding of PID and time since epoch. -
hash()
: 11-character hash of any string (hash space = 2^64).
Usage
uid()
hash(str)
Arguments
str |
A string (scalar character). |
Details
uid()
s encode sequential 1/100 second intervals, beginning at the current
process's start time. If the number of requested UIDs exceeds the number of
1/100 seconds that the process has been alive, then the process will
momentarily sleep before returning.
A uid()
begins with an uppercase letter (A - R
); a hash()
begins with
a lowercase letter (a - v
).
Value
A string (scalar character) that can be used as a mutex, semaphore, or message queue name.
Examples
library(interprocess)
uid()
hash('192.168.1.123:8011')