Hello,
On Thu, 3 Dec 2020, Jonathan Levi wrote:
I am using LibTCC to compile runtime defined functions for a rendering layer
of a project of mine. I compile many of these functions in parallel.
LibTCC is crashing with exit code -11, at what appears to be when execution
is passed to LibTCC on multiple threads, at the same time. It happens when
I try to compile multiple functions at the same time, or compile a function
at the same time as calling another already compiled function. (Although
calling multiple functions at the same time does not appear to exit.)
Should LibTCC work in multiple threads? I wonder whether I am just missing
a dependency.
It's quite possible that there are still bugs with that, but in general it
should work. There's actually a testcase that compiles tcc with itself
20 times with 20 threads, so that makes sure it normally works.
One thing to keep in mind: each thread must use a different top-level
TCCState, i.e. tcc_new result, you can't share that one between threads
(or at least can't use the same TCCState concurrently). There is a little
shared global state in TCC, but all accesses to that one are (supposed to
be) protected by appropriate mutexes (fairly coaerse grained).
You also want to use the mob branch of tcc, not the 0.9.27 release. And
you may want to have a look at tests/libtcc_test_mt.c to see if you're
using libtcc like that testcase does.
Ciao,
Michael.
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