----- Julian Elischer's Original Message -----I believe that on Linux there is a different process id for different kernel threads, is that the same, or is there a parallel for FreeBSD 5 (4.x uses user threads correct?). If that is true, could ptrace allow you to use a process id for a specific thread instead of the entire process. Then a signal (for traced processes) whenever a thread is started or stopped, and you should be able to control the state of threads. This is probably somewhat simplistic since I do not understand the whole KSE thing (but it sounds great). I am very interested in making GDB support threading very intuitively, as it is a big pain write now. For FreeBSD 4.x, could the idea Julian had (benedict arnold thread), be used to control the user threads library.
It is teh nextthing to look at..
The ptrace interface doesn't extend to coverthreads at all.
We willneed to design somewhole new system..
One posibility is the benedict arnold thread(*), that
talks with the debugger and controlls teh other threads..
Well, hoping not to create a NIH discussion, but OS/2 had/has a nice interface for thread debugging. Used it years ago as a model for setting up an environment on the mainframe (vm).
One thing to remember, a failed thread on one cpu has no effect on any threads running on other physicals. You literally need a way to control how many threads can run in parallel, how many physical cpus they can use, and in some circumstances, logicals.
-John
-kw
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