Monitor a Socket for Pipe Changes — monitor • nanonext

This function monitors pipe additions and removals from a socket.

monitor(sock, cv)

read_monitor(x)

Arguments

sock: a Socket.
cv: a 'conditionVariable'.
x: a Monitor.

Value

For monitor: a Monitor (object of class 'nanoMonitor').
For read_monitor: an integer vector of pipe IDs (positive if added, negative if removed), or else NULL if there were no changes since the previous read.

Examples

cv <- cv()
s <- socket("poly")
s1 <- socket("poly")

m <- monitor(s, cv)
m
#> < nanoMonitor >
#>  - socket: 14

listen(s)
dial(s1)

cv_value(cv)
#> [1] 1
read_monitor(m)
#> [1] 1308293005

close(s)
close(s1)

read_monitor(m)
#> [1] -1308293005