libgo/go/runtime/runtime_linux_test.go

   1 // Copyright 2012 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package runtime_test
   6
   7 import (
   8         . "runtime"
   9         "syscall"
  10         "testing"
  11         "time"
  12 )
  13
  14 var pid, tid int
  15
  16 func init() {
  17         // Record pid and tid of init thread for use during test.
  18         // The call to LockOSThread is just to exercise it;
  19         // we can't test that it does anything.
  20         // Instead we're testing that the conditions are good
  21         // for how it is used in init (must be on main thread).
  22         pid, tid = syscall.Getpid(), syscall.Gettid()
  23         LockOSThread()
  24
  25         sysNanosleep = func(d time.Duration) {
  26                 // Invoke a blocking syscall directly; calling time.Sleep()
  27                 // would deschedule the goroutine instead.
  28                 ts := syscall.NsecToTimespec(d.Nanoseconds())
  29                 for {
  30                         if err := syscall.Nanosleep(&ts, &ts); err != syscall.EINTR {
  31                                 return
  32                         }
  33                 }
  34         }
  35 }
  36
  37 func TestLockOSThread(t *testing.T) {
  38         if pid != tid {
  39                 t.Fatalf("pid=%d but tid=%d", pid, tid)
  40         }
  41 }