Re: Introduce posix_spawn

[Bruno Haible]

Eric Blake wrote:
> Although it gets prohibitively expensive in a multi-threaded process to 
> ensure proper locking between all threads that might want to use 
> posix_spawn

Why locking? posix_spawn uses fork() - the vfork() optimization is not
possible in the case when there are file actions -, which creates a
child process with a single thread. So, in the child, there are no
other threads until the exec() call, and the condition variables,
mutexes, etc. are just inactive memory regions.

Bruno