wqueue remove enter_critical_section

[hujun260]

Summary

we use small lock to replace enter_critical_section to avoid busywait

reason:
We decouple semcount from business logic
by using an independent counting variable,
which allows us to remove critical sections in many cases.

Impact

work queue

Testing

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

[acassis]

Note that some places said work_cancel() only returns success, these comments need to be fixed. i.e.:

      ret = work_cancel(LPWORK, &priv->cbwork);
      if (ret < 0)
        {
          /* NOTE: Currently, work_cancel only returns success */
  
          lcderr("ERROR: Failed to cancel work: %d\n", ret);
        }

[hujun260]

This PR requires #14578 to be merged first.

[xiaoxiang781216]

@hujun260 many comments aren't addressed in the new reversion yet.