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On AIX, shared objects must be wrapped under an archive file. For testso, creating libcgosotest with an extern symbol isn't AIX-friendly. By default, ld will block such behavior. Rather than forcing ld to work as on Linux and using the run-time linking, goCallback became a function pointer which is set by setCallback(). Updates #30565 Change-Id: I455ab32faddd41f1b0c84cc9e503788044ad49b2 Reviewed-on: https://go-review.googlesource.com/c/go/+/169020 Run-TryBot: Ian Lance Taylor <iant@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
40 lines
1.2 KiB
C
40 lines
1.2 KiB
C
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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#ifdef WIN32
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// A Windows DLL is unable to call an arbitrary function in
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// the main executable. Work around that by making the main
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// executable pass the callback function pointer to us.
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void (*goCallback)(void);
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__declspec(dllexport) void setCallback(void *f)
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{
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goCallback = (void (*)())f;
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}
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__declspec(dllexport) void sofunc(void);
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#elif defined(_AIX)
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// AIX doesn't allow the creation of a shared object with an
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// undefined symbol. It's possible to bypass this problem by
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// using -Wl,-G and -Wl,-brtl option which allows run-time linking.
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// However, that's not how most of AIX shared object works.
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// Therefore, it's better to consider goCallback as a pointer and
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// to set up during an init function.
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void (*goCallback)(void);
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void setCallback(void *f) { goCallback = f; }
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#else
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extern void goCallback(void);
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void setCallback(void *f) { (void)f; }
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#endif
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// OpenBSD and older Darwin lack TLS support
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#if !defined(__OpenBSD__) && !defined(__APPLE__)
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__thread int tlsvar = 12345;
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#endif
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void sofunc(void)
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{
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goCallback();
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}
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