[PATCH v2 3/3] posix: New Linux posix_spawn{p} implementation

[Adhemerval Zanella]

On 02-02-2016 11:05, Florian Weimer wrote:
> On 02/01/2016 05:21 PM, Adhemerval Zanella wrote:
> 
>> +  new_pid = CLONE (__spawni_child, STACK (stack, stack_size),
>> +		   CLONE_VM | CLONE_VFORK | SIGCHLD, &args);
> 
> Does this set up new per-thread variables?  Otherwise, errno in the
> parent and child will be same and the code still has races.
> 
> Florian
> 

Could you elaborate? In my understanding there is no requirement of
using CLONE_SETTLS to avoid races: CLONE_VFORK will suspend the 
calling process and even with child using the same TLS namespace as
the parent there will be no concurrent access between them.