From 544f90f798a7ebd76b71f094d4cd77f6166e606b Mon Sep 17 00:00:00 2001
From: glenda <glenda@cirno>
Date: Wed, 14 Sep 2022 08:26:29 +0000
Subject: More demos, and lock thread spawning

---
 APLDemo         |  2 +-
 concurrency.c   | 14 ++++++++++++--
 demos/chain.apl | 18 ++++++++++++++++++
 demos/demos     |  3 +++
 demos/intro.apl | 33 +++++++++++++++++++++++++++++++++
 5 files changed, 67 insertions(+), 3 deletions(-)
 create mode 100644 demos/chain.apl
 create mode 100644 demos/demos
 create mode 100644 demos/intro.apl

diff --git a/APLDemo b/APLDemo
index 106b37d..6d5f092 100755
--- a/APLDemo
+++ b/APLDemo
@@ -5,7 +5,7 @@ if(~ $#winid 0){
 	win apl &
 	sleep 1
 	winid=`{grep -e '-apl' /mnt/acme/index | awk '{print $1}' }
-	rm /tmp/apldemo.$winid.state
+	rm -f /tmp/apldemo.$winid.state
 	exit
 }
 
diff --git a/concurrency.c b/concurrency.c
index 9670866..6719e6a 100644
--- a/concurrency.c
+++ b/concurrency.c
@@ -12,6 +12,8 @@ struct SpawnData
 	Array *name;
 	Array *left;
 	Array *right;
+	QLock lock;
+	Rendez done;
 };
 
 static void newprocfn(SpawnData *);
@@ -64,18 +66,22 @@ spawnthread(Function f, Array *name, Array *left, Array *right)
 		unlock datastructures
 		exit proc
 	*/
-	SpawnData *sp = emalloc(sizeof(SpawnData));
+	SpawnData *sp = emallocz(sizeof(SpawnData), 1);
 	sp->func = dupfunction(f);
 	sp->func.scope = dupscope(f.scope);
 	sp->name = duparray(name);
 	sp->left = left ? duparray(left) : nil;
 	sp->right = duparray(right);
-
+	sp->done.l = &sp->lock;
+	
+	qlock(&sp->lock);
 	int id = rfork(RFPROC|RFMEM);
 	if(id == 0){ /* in new process*/
 		newprocfn(sp);
 		exits(nil);
 	}
+	rsleep(&sp->done);
+	qunlock(&sp->lock);
 	return id;
 }
 
@@ -189,8 +195,12 @@ Retry:
 static void
 newprocfn(SpawnData *sp)
 {
+	qlock(&sp->lock);
 	ThreadData *td = newthreaddata(sp->name);
 	_privates[0] = td;
+	rwakeup(&sp->done);
+	qunlock(&sp->lock);
+
 	ErrorGuard *eg = newerrorguard(mkscalarint(0), nil); /* make a catch-all error guard */
 	if(setjmp(eg->jmp))
 		displayerror();
diff --git a/demos/chain.apl b/demos/chain.apl
new file mode 100644
index 0000000..e7e1979
--- /dev/null
+++ b/demos/chain.apl
@@ -0,0 +1,18 @@
+⍝ First we define a function which recieves a message,
+⍝ and sends one to the task with id ⍵
+f←{
+        (from msg)←{1 ⍵}⍇⍬
+        (1+msg)⍈⍵
+      }
+
+⍝ Now start 10000 of those
+last←f&'chain'⍣10000⊢⎕self
+
+≢⎕THREADS 0
+
+⍝ Start the chain by sending something to the last one
+0 ⍈ last
+
+⎕threads 0 1 2
+
+{1 (2⊃⍵)}⍇0 ⍝ We only pick out the message part, not the sender
diff --git a/demos/demos b/demos/demos
new file mode 100644
index 0000000..b687a93
--- /dev/null
+++ b/demos/demos
@@ -0,0 +1,3 @@
+APLDemo intro.apl
+APLDemo doubleup.apl
+APLDemo chain.apl
diff --git a/demos/intro.apl b/demos/intro.apl
new file mode 100644
index 0000000..a98bb1e
--- /dev/null
+++ b/demos/intro.apl
@@ -0,0 +1,33 @@
+⍝ The send primitive is a dyadic function
+⍝ message ⍈ to
+
+message←'Hello there'
+
+⍝ We can send it to ourselves
+us←⎕self
+us
+message ⍈ us
+
+⍝ Let's examine the state of the system
+us ⎕threads 0 ⍝ Thread ID
+us ⎕threads 1 ⍝ Thread name
+us ⎕threads 2 ⍝ Number of messages in mailbox
+us ⎕threads 3 ⍝ Approximate C stack usage (in bytes)
+
+⍝ All at once, for all currently running threads
+⎕threads 0 1 2 3
+
+⍝ We have one message in our mailbox, let's receive it
+⍝ The recieve primitive is a monadic operator
+⍝ filter ⍇ timeout
+{1 ⍵} ⍇ 0
+
+⍝ Again?
+{1 ⍵} ⍇ 0
+⍝ The time we asked it to wait was 0, so it failed immediately.
+{1 ⍵} ⍇ 5
+
+⍝ What if we don't want it to timeout?
+{1 ⍵} ⍇ ⍬  ⍝ Noone will send it anything, so it hangs
+
+
-- 
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