spsc-queue: add new benchmark
-rw-r--r-- 74 .gitignore
-rw-r--r-- 150 Makefile
drwxr-xr-x - barrier
-rw-r--r-- 455 benchmarks.mk
drwxr-xr-x - include
drwxr-xr-x - mcs-lock
drwxr-xr-x - mpmc-queue
drwxr-xr-x - queue
-rwxr-xr-x 479 run.sh
drwxr-xr-x - spsc-queue