mm/iob: remove csection #54
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Summary
reason:
We decouple semcount from business logic
by using an independent counting variable,
which allows us to remove critical sections in many cases.
Impact
mm/iob
Testing
test by apache/nuttx-apps#2849
Build Host:
OS: Ubuntu 20.04
CPU: x86_64
Compiler: GCC 9.4.0
Configuring NuttX and compile:
$ ./tools/configure.sh -l qemu-armv8a:nsh_smp
$ make
Running with qemu
$ qemu-system-aarch64 -cpu cortex-a53 -smp 4 -nographic
-machine virt,virtualization=on,gic-version=3
-net none -chardev stdio,id=con,mux=on -serial chardev:con
-mon chardev=con,mode=readline -kernel ./nuttx