On Thu, Oct 14, 2004 at 13:10:42 +0300, Momchil Velikov wrote: > Jan Hudec wrote: > >Yes. And it is the *SOLE* reason for the difference in ps output. Well, > >in fact, the manager thread is also gone and some ABI is being used so > >it's all faster. But the basic principle -- that each thread is > >a process -- has not changed. > > The term "process" is used inappropriately, or as a shorcut to the more > appropriate term "Linux kernel schedulable entity". Yes, it is. I should have used the term "task". > A process is a collection of resources, which include executable image > (a.k.a. program), address space, file descriptors, environment > variables, current working directory, atexit cleanup handlers[1], etc. A > process is a place, not an activity. OTOH, a thread is an activity, > which happens in a particular place, i.e. process. Threads share the > abovementioned resources, thus they are part of the same process and are > not processes themselves. Except the identity of a "process" in this meaning is rather blured in linux, since two "tasks" (schedulable entitied -- threads reserved for meaning pthread threds) can share some resources and not others. > Thus the above "principle" is not and was never true, according to the > established[2] definition of "process". It's simply someone choose to > call threads "processes", but forgot to invent a term for processes. Ok. Each thread, in pthread meaning of thread, is a task, in kernel scheduler meaning of a task. ------------------------------------------------------------------------------- Jan 'Bulb' Hudec <bulb@xxxxxx>
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