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      1 package cgotest
      2 
      3 /*
      4 void lockOSThreadCallback(void);
      5 inline static void lockOSThreadC(void)
      6 {
      7         lockOSThreadCallback();
      8 }
      9 int usleep(unsigned usec);
     10 */
     11 import "C"
     12 
     13 import (
     14 	"runtime"
     15 	"testing"
     16 )
     17 
     18 func init() {
     19 	// Same as test3775 but run during init so that
     20 	// there are two levels of internal runtime lock
     21 	// (1 for init, 1 for cgo).
     22 	// This would have been broken by CL 11663043.
     23 	C.lockOSThreadC()
     24 }
     25 
     26 func test3775(t *testing.T) {
     27 	// Used to panic because of the UnlockOSThread below.
     28 	C.lockOSThreadC()
     29 }
     30 
     31 //export lockOSThreadCallback
     32 func lockOSThreadCallback() {
     33 	runtime.LockOSThread()
     34 	runtime.UnlockOSThread()
     35 	go C.usleep(10000)
     36 	runtime.Gosched()
     37 }
     38