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Re: [Tinycc-devel] Multiple, threaded LibTCC states

From: Karl Yerkes
Subject: Re: [Tinycc-devel] Multiple, threaded LibTCC states
Date: Fri, 4 Dec 2020 08:17:38 -0800

Hi Jonathan --

I am responding because I've tried to use multiple instances of libtcc in various threads. i am not a tiny CC developer.

the short answer is no. libtcc is not designed to be reentrant. there is global state that messes stuff up sometimes when you try to use multiple instances simultaneously.

there have been several attempts to move TCC in the direction of reentrancy, but (to my knowledge) it has not happened yet.

personally, i've had luck getting two instances working by linking both statically and then dynamically in the same program. although, i'm not an expert and i could just be getting lucky. i'm now working to a "one process per two TCC instances" scheme.

for more, search the email archives for reentrant.

if i'm wrong about any of this, i hope someone with more knowledge will correct me :)

-- karl

On Fri, Dec 4, 2020 at 6:07 AM Jonathan Levi <JonathanILevi@gmail.com> 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.

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