... i don't have a multi-cpu system to test on, but i accept your explanation that a single process can be running things across core boundaries.... but that seems quite insecure and it would seem to be a good kernel option to have ( like in the NSA-security kernel )...why?.... because according to your explanation, any process can start injjecting code into all the other cores of a multicore machine, just by starting a few threads..... how does this affect the nice value of the parent thread... does it increase according to thread count?....... what does it mean then to give a nice value to a script?... if the script can start spawning an infinite number of threads..... or what is to stop core hijacking by me spawning a thread until it gets into the desired core.... then executing something that halts the core, or other malicious intent...oO( maybe promoting threading is good for national security ;-) )
... my original intent was to point out that threads are not the fastest IPC out there, and continuing in that vein, there is Why use threads over processes, or why use processes over threads? and Threads versus fork, which to use? and Using forks and threads ...then choose the IPC right for you
..... by the way.... you would have no such POSIX module thread-safety in a fork-and-exec
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