[M3devel] User-level threads using makecontext/getcontext/swapcontext

[Tony Hosking]

I have a (slightly rough) derivative version of ThreadPosix working on  
I386_DARWIN (implemented more along the lines of the current  
ThreadPThread) which abstracts all the nasty C-isms into  
ThreadPosixC.c.  I would like to propose that this become our updated  
user-level threads implementation to complement ThreadPThread and  
ThreadWin32, but doing so will require reworking the C code for the  
other targets.  My question is the following: which targets currently  
default to ThreadPosix (instead of ThreadPThread)?  Do those targets  
all have makecontext/getcontext/swapcontext (or equivalents that might  
be simulated with setjmp/longjmp)?  I can make the effort to ensure  
things work for SOLgnu/SOLsun, *_DARWIN, LINUXLIBC6, but don't have  
easy access to existing ABIs for other targets.  Can someone else do  
that?  The advantage of this move will be to eliminate a large swath  
of "cloned" RTMachine and RTThread implementations and simplify  
porting.  If we are in agreement on this then I can begin to tidy up  
and commit my changes.  The advantage of retaining the user-level  
threads code is its benefit as a live reference implementation of the  
Modula-3 thread semantics.

Antony Hosking | Associate Professor | Computer Science | Purdue  
University
305 N. University Street | West Lafayette | IN 47907 | USA
Office +1 765 494 6001 | Mobile +1 765 427 5484




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