Signal Forwarder

Forwards signals from one ‘conditionVariable’ to another.

Usage

cv %~>% cv2

Arguments

cv

a ‘conditionVariable’ object, from which to forward the signal.

cv2

a ‘conditionVariable’ object, to which the signal is forwarded.

Value

Invisibly, ‘cv2’.

Details

The condition value of ‘cv’ is initially reset to zero when this operator returns. Only one forwarder can be active on a ‘cv’ at any given time, and assigning a new forwarding target cancels any currently existing forwarding.

Changes in the condition value of ‘cv’ are forwarded to ‘cv2’, but only on each occassion ‘cv’ is signalled. This means that waiting on ‘cv’ will cause a temporary divergence between the actual condition value of ‘cv’ and that recorded at ‘cv2’, until the next time ‘cv’ is signalled.

Examples

cva <- cv(); cvb <- cv(); cv1 <- cv(); cv2 <- cv()

cva %~>% cv1 %~>% cv2
cvb %~>% cv2

cv_signal(cva)
cv_signal(cvb)
cv_value(cv1)
#> [1] 1
cv_value(cv2)
#> [1] 2