1  // Copyright 2011 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 ignore
       6  
       7  #ifdef WIN32
       8  // A Windows DLL is unable to call an arbitrary function in
       9  // the main executable. Work around that by making the main
      10  // executable pass the callback function pointer to us.
      11  void (*goCallback)(void);
      12  __declspec(dllexport) void setCallback(void *f)
      13  {
      14  	goCallback = (void (*)())f;
      15  }
      16  __declspec(dllexport) void sofunc(void);
      17  #elif defined(_AIX)
      18  // AIX doesn't allow the creation of a shared object with an
      19  // undefined symbol. It's possible to bypass this problem by
      20  // using -Wl,-G and -Wl,-brtl option which allows run-time linking.
      21  // However, that's not how most of AIX shared object works.
      22  // Therefore, it's better to consider goCallback as a pointer and
      23  // to set up during an init function.
      24  void (*goCallback)(void);
      25  void setCallback(void *f) { goCallback = f; }
      26  #else
      27  extern void goCallback(void);
      28  void setCallback(void *f) { (void)f; }
      29  #endif
      30  
      31  // OpenBSD and older Darwin lack TLS support
      32  #if !defined(__OpenBSD__) && !defined(__APPLE__)
      33  __thread int tlsvar = 12345;
      34  #endif
      35  
      36  void sofunc(void)
      37  {
      38  	goCallback();
      39  }