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+# Bounding resource use
+
+To bound a program's use of a limited resource, like memory, have goroutines synchronize their use of that resource using a buffered channel (i.e., use the channel as a semaphore):
+```
+const (
+ AvailableMemory = 10 << 20 // 10 MB
+ AverageMemoryPerRequest = 10 << 10 // 10 KB
+ MaxOutstanding = AvailableMemory / AverageMemoryPerRequest
+)
+var sem = make(chan int, MaxOutstanding)
+
+func Serve(queue chan *Request) {
+ for {
+ sem <- 1 // Block until there's capacity to process a request.
+ req := <-queue
+ go handle(req) // Don't wait for handle to finish.
+ }
+}
+
+func handle(r *Request) {
+ process(r) // May take a long time & use a lot of memory or CPU
+ <-sem // Done; enable next request to run.
+}
+```
+
+## References
+
+Effective Go's discussion of channels: http://golang.org/doc/effective_go.html#channels
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