Re: using of fork() in multithreaded application

On 1/24/25 1:27 PM, Greg Troxel wrote:
> Taylor R Campbell <[email protected]> writes:
> 
>>> Date: Wed, 22 Jan 2025 16:47:13 +0100
>>> From: Peter Skvarka <[email protected]>
>>>
>>> I have two questions:
>>> Is safe using of fork() in NetBSD 10.1 in mutlithreaded application ?
>>
>> Generally yes, with the caveat that it is difficult for applications
>> to use correctly.
> 
> In 2010ish I saw a hard-to-find bug, the details of which are now fading
> from memory.  I think it was some kind of lock taken in a routine that
> was called after fork and before exec.  I think the program was python
> and the lock was in libc's malloc. (This would have NetBSD 5 or 6.)

I've fixed various issues in libc to make fork-without-exec reasonable 
reliable for many use cases. malloc certainly was one of them.

Joerg