1276 - make C++ version the default

I've tried to update the Readme, but there are at least a couple of issues.

1 files changed, 49 insertions, 0 deletions

diff --git a/arc/channel.mu b/arc/channel.mu
new file mode 100644
index 00000000..61151833
--- /dev/null
+++ b/arc/channel.mu
@@ -0,0 +1,49 @@
+(function producer [
+  ; produce numbers 1 to 5 on a channel
+  (default-space:space-address <- new space:literal 30:literal)
+  (chan:channel-address <- next-input)
+  ; n = 0
+  (n:integer <- copy 0:literal)
+  { begin
+    (done?:boolean <- less-than n:integer 5:literal)
+    (break-unless done?:boolean)
+    ; other threads might get between these prints
+    ($print (("produce: " literal)))
+    (print-integer nil:literal/terminal n:integer)
+    ($print (("\n" literal)))
+    ; 'box' n into a dynamically typed 'tagged value' because that's what
+    ; channels take
+    (n2:integer <- copy n:integer)
+    (n3:tagged-value-address <- init-tagged-value integer:literal n2:integer)
+    (chan:channel-address/deref <- write chan:channel-address n3:tagged-value-address/deref)
+    (n:integer <- add n:integer 1:literal)
+    (loop)
+  }
+])
+
+(function consumer [
+  ; consume and print integers from a channel
+  (default-space:space-address <- new space:literal 30:literal)
+  (chan:channel-address <- next-input)
+  { begin
+    ; read a tagged value from the channel
+    (x:tagged-value chan:channel-address/deref <- read chan:channel-address)
+    ; unbox the tagged value into an integer
+    (n2:integer <- maybe-coerce x:tagged-value integer:literal)
+    ; other threads might get between these prints
+    ($print (("consume: " literal)))
+    (print-integer nil:literal/terminal n2:integer)
+    ($print (("\n" literal)))
+    (loop)
+  }
+])
+
+(function main [
+  (default-space:space-address <- new space:literal 30:literal)
+  (chan:channel-address <- init-channel 3:literal)
+  ; create two background 'routines' that communicate by a channel
+  (routine1:integer <- fork consumer:fn nil:literal/globals nil:literal/limit chan:channel-address)
+  (routine2:integer <- fork producer:fn nil:literal/globals nil:literal/limit chan:channel-address)
+  (sleep until-routine-done:literal routine1:integer)
+  (sleep until-routine-done:literal routine2:integer)
+])