Hello Pierre-Marie,
On 11/10/2021 15:39, Pierre-Marie de Rodat via Gcc-patches wrote:
RTEMS supports attaching interrupt handlers to hardware interrupt
vectors, which is superior to the current approach of attaching handlers
to signals. Direct attachment of handlers removes the execution
overhead of converting hardware interrupts to signals and their
subsequent propagation to the interrupt manager. It also removes the
limitation of the number of hardware interrupts that can be supported
under the signals model, as RTEMS is limited to 32 signals.
Tested on x86_64-pc-linux-gnu, committed on trunk
for Newlib internal locks, the OpenMP library (libgomp), and the C++
standard library we use self-contained synchronization objects for RTEMS
defined by <sys/_lock.h> which is provided by Newlib:
https://sourceware.org/git/?p=newlib-cygwin.git;a=blob;f=newlib/libc/sys/rtems/include/sys/lock.h;h=d6169025b1a0d10ded0e31982baff64453e69cae;hb=HEAD
Binary and counting semaphores are supported, for example:
void _Semaphore_Post_binary(struct _Semaphore_Control *);
Using this interface has the benefit that the storage for the
synchronization objects is user-provided. So, there is no need to
account for these objects in the configuration.
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