Github user jpeach commented on the pull request:
https://github.com/apache/trafficserver/pull/568#issuecomment-209663459
OK the locking makes sense to me I think. You have to hold the lock because
you want to serialize WRT printing output.
``Diags::rebind_stderr`` and ``Diags::rebind_stdout`` don't need to be part
of the class interface. You can replace both of these with a single local
static helper:
```C
bool rebind(int oldfd, int newfd) {
/* ... error handling ... */
return dup2(newfd, oldfd) == 0;
}
```
Please write unit tests for this.
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