github.com/kidsbmilk/gofronted_all@v0.0.0-20220701224323-6479d5976c5d/libgo/misc/cgo/testso/testdata/cgoso_c.c (about)

     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  }