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Signal Forwarder

Source: R/sync.R
grapes-twiddle-greater-than-grapes.Rd

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