progress with futures

tests/parallel/tflowvar.nim

@@ -0,0 +1,17 @@
+discard """
+  output: '''foobarfoobarbazbearbazbear'''
+  cmd: "nimrod $target --threads:on $options $file"
+"""
+
+import threadpool
+
+proc computeSomething(a, b: string): string = a & b & a & b
+
+proc main =
+  let fvA = spawn computeSomething("foo", "bar")
+  let fvB = spawn computeSomething("baz", "bear")
+
+  echo(^fvA, ^fvB)
+
+main()
+sync()

tests/parallel/tsysspawn.nim

@@ -0,0 +1,31 @@
+discard """
+  output: '''4
+8'''
+  cmd: "nimrod $target --threads:on $options $file"
+"""
+
+import threadpool
+
+var
+  x, y = 0
+
+proc p1 =
+  for i in 0 .. 10_000:
+    discard
+
+  atomicInc x
+
+proc p2 =
+  for i in 0 .. 10_000:
+    discard
+
+  atomicInc y, 2
+
+for i in 0.. 3:
+  spawn(p1())
+  spawn(p2())
+
+sync()
+
+echo x
+echo y

tests/parallel/tsysspawnbadarg.nim

@@ -0,0 +1,9 @@
+discard """
+  line: 7
+  errormsg: "'spawn' takes a call expression"
+  cmd: "nimrod $target --threads:on $options $file"
+"""
+
+import threadpool
+
+spawn(1)