Thw Amiga OS, released around that time was completely and pervasively based on threads and IIRC, everything but the alíen standard libraries provided with C compilers were thread safe.

In reply to Re^6: Disadvantage of not supporting pthreads in perl and how perl overcomes? (cores) by salva
in thread Disadvantage of not supporting pthreads in perl and how perl overcomes? by Anonymous Monk

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