feklushkin.denis at gmail.com
Tue Oct 13 10:35:57 UTC 2020
On Tuesday, 13 October 2020 at 10:25:35 UTC, IGotD- wrote:
> On Tuesday, 13 October 2020 at 09:32:07 UTC, Denis Feklushkin
>> Can anyone explain what "--emulated-tls" actually do?
>> It solves my problem with correct static variables placement
>> on ARM Cortex M3, but I don't know why.
> I think it is a compatibility layer that GCC provides. Instead
> of implementing everything yourself from scratch, GCC provide a
> framework and a set of hooks you should implement.
> It seems like GCC provides default hooks, so for example if
> threading is not enabled this TLS emulation layer is probably
> pretty stupid and do not know what a thread is.
So, compiler knows what this platform is not supports
multithreading and does some things wrong with thread static
variables if "--emulated-tls" is ommited?
> The variables are dynamically allocated using the C library
> memory allocation functions.
As I understand, variables allocated by compiler, but it uses
internal implict call to __tls_get_addr to provide access to them.
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