runtime: support Goexit

runtime/internal/clite/pthread/pthread.go

@@ -56,6 +56,20 @@ func Exit(retval c.Pointer)
 //go:linkname Cancel C.pthread_cancel
 func Cancel(thread Thread) c.Int
 
+// The pthread_self() function returns the ID of the calling thread.
+// This is the same value that is returned in *thread in the
+// pthread_create(3) call that created this thread.
+//
+//go:linkname Self C.pthread_self
+func Self() Thread
+
+// The pthread_equal() function compares two thread identifiers.
+// If the two thread IDs are equal, pthread_equal() returns a nonzero
+// value; otherwise, it returns 0.
+//
+//go:linkname Equal C.pthread_equal
+func Equal(t1, t2 Thread) c.Int
+
 // -----------------------------------------------------------------------------
 
 // Attr represents a POSIX thread attributes.

runtime/internal/lib/runtime/runtime.go

@@ -31,7 +31,7 @@ import "C"
 import (
 	"unsafe"
 
-	"github.com/goplus/llgo/runtime/internal/clite/pthread"
+	"github.com/goplus/llgo/runtime/internal/runtime"
 )
 
 // llgo:skipall
@@ -52,7 +52,7 @@ func GOMAXPROCS(n int) int {
 }
 
 func Goexit() {
-	pthread.Exit(nil)
+	runtime.Goexit()
 }
 
 func KeepAlive(x any) {

runtime/internal/runtime/z_rt.go

@@ -78,17 +78,31 @@ func Rethrow(link *Defer) {
 }
 
 var (
-	excepKey pthread.Key
+	excepKey   pthread.Key
+	mainThread pthread.Thread
+	goexit     struct{}
 )
 
+func Goexit() {
+	panic(goexit)
+}
+
 func init() {
 	excepKey.Create(nil)
+	mainThread = pthread.Self()
 }
 
 // -----------------------------------------------------------------------------
 
 // TracePanic prints panic message.
 func TracePanic(v any) {
+	if v == goexit {
+		if pthread.Equal(mainThread, pthread.Self()) != 0 {
+			fatal("no goroutines (main called runtime.Goexit) - deadlock!")
+			c.Exit(2)
+		}
+		pthread.Exit(nil)
+	}
 	print("panic: ")
 	printany(v)
 	println("\n")