main_test: skip flaky concurrency tests on threaded schedulers

Author: jakebailey

main_test.go

@@ -264,8 +264,21 @@ func runPlatTests(options compileopts.Options, tests []string, t *testing.T) {
 	isWASI := strings.HasPrefix(options.Target, "wasi")
 	isWebAssembly := isWASI || strings.HasPrefix(options.Target, "wasm") || (options.Target == "" && strings.HasPrefix(options.GOARCH, "wasm"))
 	isBaremetal := options.Target == "simavr" || options.Target == "cortex-m-qemu" || options.Target == "riscv-qemu"
+	scheduler := options.Scheduler
+	if scheduler == "" {
+		scheduler = spec.Scheduler
+	}
 
 	for _, name := range tests {
+		if scheduler == "threads" || scheduler == "cores" {
+			switch name {
+			case "goroutines.go", "timers.go":
+				// These tests intentionally check concurrent scheduling by
+				// comparing output order, which is not deterministic with
+				// threaded schedulers.
+				continue
+			}
+		}
 		if options.GOOS == "linux" && (options.GOARCH == "arm" || options.GOARCH == "386") {
 			switch name {
 			case "timers.go":