On Sun, Sep 12, 2004 at 10:30:00PM +1000, Anton Blanchard wrote:
> 
> Hmm can you point the 16bit counter out? I can create 1 million NPTL
> threads on ppc64 easily, so why not?

/*
 * the semaphore definition
 */
struct rw_semaphore {
        /* XXX this should be able to be an atomic_t  -- paulus */
        signed int              count;
#define RWSEM_UNLOCKED_VALUE            0x00000000
#define RWSEM_ACTIVE_BIAS               0x00000001
#define RWSEM_ACTIVE_MASK               0x0000ffff

that counter is split in 2 16 bit entities....