1 files changed, 78 insertions, 0 deletions
diff --git a/src/runtime/testdata/testprogcgo/raceprof.go b/src/runtime/testdata/testprogcgo/raceprof.go
new file mode 100644
index 0000000..f7ca629
--- /dev/null
+++ b/src/runtime/testdata/testprogcgo/raceprof.go
@@ -0,0 +1,78 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux,amd64 freebsd,amd64
+
+package main
+
+// Test that we can collect a lot of colliding profiling signals from
+// an external C thread. This used to fail when built with the race
+// detector, because a call of the predeclared function copy was
+// turned into a call to runtime.slicecopy, which is not marked nosplit.
+
+/*
+#include <signal.h>
+#include <stdint.h>
+#include <pthread.h>
+#include <sched.h>
+
+struct cgoTracebackArg {
+	uintptr_t  context;
+	uintptr_t  sigContext;
+	uintptr_t* buf;
+	uintptr_t  max;
+};
+
+static int raceprofCount;
+
+// We want a bunch of different profile stacks that collide in the
+// hash table maintained in runtime/cpuprof.go. This code knows the
+// size of the hash table (1 << 10) and knows that the hash function
+// is simply multiplicative.
+void raceprofTraceback(void* parg) {
+	struct cgoTracebackArg* arg = (struct cgoTracebackArg*)(parg);
+	raceprofCount++;
+	arg->buf[0] = raceprofCount * (1 << 10);
+	arg->buf[1] = 0;
+}
+
+static void* raceprofThread(void* p) {
+	int i;
+
+	for (i = 0; i < 100; i++) {
+		pthread_kill(pthread_self(), SIGPROF);
+		sched_yield();
+	}
+	return 0;
+}
+
+void runRaceprofThread() {
+	pthread_t tid;
+	pthread_create(&tid, 0, raceprofThread, 0);
+	pthread_join(tid, 0);
+}
+*/
+import "C"
+
+import (
+	"bytes"
+	"fmt"
+	"runtime"
+	"runtime/pprof"
+	"unsafe"
+)
+
+func init() {
+	register("CgoRaceprof", CgoRaceprof)
+}
+
+func CgoRaceprof() {
+	runtime.SetCgoTraceback(0, unsafe.Pointer(C.raceprofTraceback), nil, nil)
+
+	var buf bytes.Buffer
+	pprof.StartCPUProfile(&buf)
+
+	C.runRaceprofThread()
+	fmt.Println("OK")
+}