Source file misc/cgo/test/cgo_thread_lock.go

     1  // Copyright 2016 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  // +build linux,freebsd,openbsd
     6  
     7  package cgotest
     8  
     9  /*
    10  #include <unistd.h>
    11  #include <sys/syscall.h>
    12  void Gosched(void);
    13  static int Ctid(void) { Gosched(); return syscall(SYS_gettid); }
    14  */
    15  import "C"
    16  
    17  import (
    18  	"runtime"
    19  	"syscall"
    20  	"testing"
    21  	"time"
    22  )
    23  
    24  //export Gosched
    25  func Gosched() {
    26  	runtime.Gosched()
    27  }
    28  
    29  func init() {
    30  	testThreadLockFunc = testThreadLock
    31  }
    32  
    33  func testThreadLock(t *testing.T) {
    34  	stop := make(chan int)
    35  	go func() {
    36  		// We need the G continue running,
    37  		// so the M has a chance to run this G.
    38  		for {
    39  			select {
    40  			case <-stop:
    41  				return
    42  			case <-time.After(time.Millisecond * 100):
    43  			}
    44  		}
    45  	}()
    46  	defer close(stop)
    47  
    48  	for i := 0; i < 1000; i++ {
    49  		if C.int(syscall.Gettid()) != C.Ctid() {
    50  			t.Fatalf("cgo has not locked OS thread")
    51  		}
    52  	}
    53  }
    54  

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