neco: fix

c/neco/_demo/gen2/gen2.go

@@ -0,0 +1,48 @@
+package main
+
+import (
+	"unsafe"
+
+	"github.com/goplus/llgo/c"
+	"github.com/goplus/llgo/c/neco"
+)
+
+func main() {
+	neco.Main(func() c.Int {
+		// Create a new generator coroutine that is used to send ints.
+		gen := new(neco.Gen)
+		neco.GenStart(&gen, unsafe.Sizeof(int(0)), coroutine, 0)
+
+		// Iterate over each int until the generator is closed.
+		var i c.Int
+		for {
+			ret := neco.GenNext(gen, c.Pointer(&i))
+
+			// c.Printf(c.Str("gen [%d, %d] "), ret, c.Int(neco.NECO_CLOSED))
+			// c.Fflush(c.Stdout)
+
+			if ret != c.Int(neco.CLOSED) {
+				c.Printf(c.Str("%d\n"), i)
+			} else {
+				break
+			}
+		}
+
+		// This coroutine no longer needs the generator.
+		neco.GenRelease(gen)
+
+		// c.Printf(c.Str("main3 end"))
+		// c.Fflush(c.Stdout)
+
+		return 0
+	})
+}
+
+func coroutine(argc c.Int, argv ...any) {
+	// Yield each int to the caller, one at a time.
+	for i := 0; i < 10; i++ {
+		neco.GenYield(c.Pointer(&i))
+	}
+	// c.Printf(c.Str("coroutine end"))
+	// c.Fflush(c.Stdout)
+}