On 12 April 2016 at 14:28, Kai Ruottu <kai.ruottu@xxxxxxxxxxx> wrote: > 12.4.2016, 16:14, Kai Ruottu kirjoitti: >> >> But I cannot "grok" how the bare "arm-eabi" object >> format or the generic newlib C library could provide that required >> "operating system" >> for threads. >> > > What newlib can do is to provide code which works when used in threads : > > https://en.wikipedia.org/wiki/Thread_safety > > From my own "low-level" programming time, terms like "re-entrant" came quite > familiar :) Libstdc++ doesn't care about OS support for threads, it cares about an available API for threads, such as Pthreads. newlib includes a <pthread.h> file that implements the Pthreads API, and so you can configure libstdc++ with --enable-threads=posix when using newlib (although I assume this requires that newlib itself has been configured with Pthreads support enabled). So I stand by my assertion that using newlib does not necessarily imply that the default thread model is "single".
