This function monitors pipe additions and removals from a socket.
Usage
monitor(sock, cv)
read_monitor(x)
Arguments
- sock
a Socket.
- cv
a conditionVariable.
- x
an external pointer to 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: 18
listen(s)
dial(s1)
cv_value(cv)
#> [1] 1
read_monitor(m)
#> [1] 623578802
close(s)
close(s1)
read_monitor(m)
#> [1] -623578802
