Here are a few title options, capturing the essence of your article and framing it as a question: **Option 1 (Focus on the problem):** * **Why Does My Go C-Shared Library Hang on https.Post() When L-Golang-php.cn

Here are a few title options, capturing the essence of your article and framing it as a question: **Option 1 (Focus on the problem):** * **Why Does My Go C-Shared Library Hang on https.Post() When L

Barbara Streisand

Release： 2024-10-25 08:33:02

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Here are a few title options, capturing the essence of your article and framing it as a question:

**Option 1 (Focus on the problem):**

* **Why Does My Go C-Shared Library Hang on https.Post() When Linked to a C Application?**

**Option 2 (Focus on the c

Debugging C-Shared Library (Go) Hangs on HTTPS.Post() Call

The problem arises when a Go C-shared library (built with -buildmode=c-shared) hangs on https.Post(). This issue does not occur when the code is built as an executable.

To debug and resolve this issue, consider the following:

Troubleshooting with Stracing:
```
strace -fp PID
```
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This command may reveal that the program is stuck in futex() calls.
Advanced Profiling Using ListenAndServe:
```
http.ListenAndServe("localhost:6060", nil)
http.Post()
```
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If the program hangs on http.Post(), it may indicate that the profiler is blocked.
Analyzing Stack Trace:

http.Post() hangs on a futex() call, which is used to synchronize goroutines. The stack trace shows that the goroutine is blocked at runtime.futexsleep() and runtime.notesleep().
Solution: Controlling Go Runtime Loading

The solution lies in controlling when the Go runtime is loaded. When linking with a C or C application, the Go runtime gets loaded as soon as the app starts. However, in a forked process, this behavior can lead to unpredictable outcomes.

By using dlopen and dlsym, you can load the Go shared library after the fork() call and control when the Go runtime gets loaded. This approach ensures predictable behavior within forked processes.

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