Preparation for lane:close() and correct to-be-closed variables

* lane:join() can no longer be used to read yielded values
* same with lane indexing
* stub for lane:close(), similar to coroutine.close() (not implemented yet)
* preparing tests for to-be-closed variables in yielded coroutine lanes
* yielded lanes unlock and terminate properly at Lanes shutdown

1 files changed, 38 insertions, 0 deletions

diff --git a/unit_tests/scripts/coro/regular_function.lua b/unit_tests/scripts/coro/regular_function.lua
new file mode 100644
index 0000000..09aa3b7
--- /dev/null
+++ b/unit_tests/scripts/coro/regular_function.lua
@@ -0,0 +1,38 @@
+local lanes = require "lanes".configure()
+
+local utils = lanes.require "_utils"
+local PRINT = utils.MAKE_PRINT()
+
+-- a lane body that just returns some value
+local returner = function(msg_)
+    local utils = lanes.require "_utils"
+    local PRINT = utils.MAKE_PRINT()
+    PRINT "In lane"
+    assert(msg_ == "hi")
+    return "bye"
+end
+
+-- a function that returns some value can run in a coroutine
+if true then
+    -- the generator
+    local g = lanes.coro("*", {name = "auto"}, returner)
+
+    -- launch lane
+    local h = g("hi")
+
+    local r = h[1]
+    assert(r == "bye")
+end
+
+-- can't resume a coro after the lane body has returned
+if true then
+    -- the generator
+    local g = lanes.coro("*", {name = "auto"}, returner)
+
+    -- launch lane
+    local h = g("hi")
+
+    -- resuming a lane that terminated execution should raise an error
+    local b, e = pcall(h.resume, h)
+    assert(b == false and type(e) == "string")
+end