Re: What would it take....

[Da Zheng]

Hi,

Samuel Thibault wrote:
>> When process-shared semaphores and mutexes themselves are in the shared 
>> memory, can we not use the similar implementation as the ones in the same 
>> process?
> 
> The implementation uses Mach messages, so it's basically the same thing.
> With different tasks, you need to add the task name along the port name.
> And you need that to be done securely, including for a semaphore between
> a root process and a user process. In a process of a single user, much
> less issues happen.
I didn't realize there is a security issue.
Then must process-shared semaphores and mutexes be implemented in shared 
memory? or it's completely through IPCs?

Zheng Da