On Wed, Sep 9, 2020 at 11:55 PM Yonatan Gizachew <emeg...@gmail.com> wrote: > > Thank you for the explanation. For example, please have a look at the this bt. > __tls_get_addr is called after runtime.getg. So, what does __tls_get_addr > return at this time, a pointer to runtime.g or runtime.g itself?
If I recall correctly, __tls_get_addr (which is of course a general utility that has nothing particularly to do with Go) will return the address of runtime.g for the thread that calls it. Ian > On Thursday, September 10, 2020 at 12:15:04 PM UTC+9 Ian Lance Taylor wrote: >> >> On Wed, Sep 9, 2020 at 7:39 PM Yonatan Gizachew <eme...@gmail.com> wrote: >> > >> > This might be trivial, but could you explain me the relationship between >> > the following? >> > 1. value returned by __tls_get_addr >> >> This is the address of the TLS control block. The exact definition >> depends on the architecture. All TLS variables are at some offset >> from this value. >> >> > 2. runtime.g >> >> A TLS variable that holds the current goroutine, a pointer to a g struct. >> >> > 3. runtime.g0 >> >> A global variable that holds the g struct used for the initial goroutine. >> >> > 4. runtime.m0 >> >> A global variable that holds the m struct used for the initial thread. >> >> > 5. runtime.m >> >> gccgo no longer uses this. In earlier releases it was a TLS variable >> that holds the current thread, a pointer to an m struct. In current >> releases gccgo uses g->m for this. >> >> Ian > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/20dd490b-f972-4af7-bf4c-f2ab8188c5c1n%40googlegroups.com. -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CAOyqgcXTEX8i6j6qdcr4jEdOo%2Beix8zoepn4by8nuO%2BirqXF8w%40mail.gmail.com.
