arc_set_memmgr -> arc_init_memmgr
arc_set_memmgr -> arc_init_memmgr
arc_set_memmgr -> arc_init_memmgr
arc_set_memmgr -> arc_init_memmgr
root marker marks type descriptors
add threading stuff to arc struct and prototype full init function
main arc_init
threading initialisation function
default stack size definition