On 03/08/12 00:17, Sebastian Huber wrote: > thanks for the hints. Thus if we want to use the C++ atomic operations on > 32-bit ARM in RTEMS we have to implement everything in > > libgcc/config/arm/linux-atomic.c > > and place it in e.g. > > libgcc/config/arm/rtems-atomic.c
Possibly. It really depends on how rtems attacks the problem of atomic operations across ARM cpu revisions. I have no opinion as to what solution should be used. > I guess similar procedures are required for other architectures. Not really. ARM is unique in having an atomic insn (SWP) that stops working in later ISA revisions, and a required memory barrier (DMB) introduced late in the ISA revision history that isn't a backward-compatible NOP. r~
