spinlock.h File Reference

#include <linux/compiler.h>
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/atomic.h>
#include <asm/intrinsics.h>

Go to the source code of this file.

Macros
#define	arch_spin_lock_init(x)   ((x)->lock = 0)
#define	TICKET_SHIFT   17
#define	TICKET_BITS   15
#define	TICKET_MASK   ((1 << TICKET_BITS) - 1)
#define	arch_spin_is_contended   arch_spin_is_contended
#define	arch_read_can_lock(rw)   (*(volatile int *)(rw) >= 0)
#define	arch_write_can_lock(rw)   (*(volatile int *)(rw) == 0)
#define	arch_read_lock_flags(rw, flags)   arch_read_lock(rw)
#define	arch_read_lock(rw)
#define	arch_read_unlock(rw)
#define	arch_write_lock_flags(l, flags)   arch_write_lock(l)
#define	arch_write_lock(l)
#define	arch_write_trylock(rw)
#define	arch_spin_relax(lock)   cpu_relax()
#define	arch_read_relax(lock)   cpu_relax()
#define	arch_write_relax(lock)   cpu_relax()

Macro Definition Documentation

#define arch_read_can_lock

(

rw

)

(*(volatile int *)(rw) >= 0)

Definition at line 142 of file spinlock.h.

#define arch_read_lock

(

rw

)

Value:

do {                                            \
	arch_rwlock_t *__read_lock_ptr = (rw);                     \
                                            \
    while (unlikely(ia64_fetchadd(1, (int *) __read_lock_ptr, acq) < 0)) {      \
        ia64_fetchadd(-1, (int *) __read_lock_ptr, rel);            \
        while (*(volatile int *)__read_lock_ptr < 0)                \
            cpu_relax();                            \
    }                                       \
} while (0)

Definition at line 177 of file spinlock.h.

#define arch_read_lock_flags	(		rw,
			flags
	)		arch_read_lock(rw)

Definition at line 175 of file spinlock.h.

#define arch_read_relax

(

lock

)

cpu_relax()

Definition at line 288 of file spinlock.h.

#define arch_read_unlock

(

rw

)

Value:

do {                                \
	arch_rwlock_t *__read_lock_ptr = (rw);         \
    ia64_fetchadd(-1, (int *) __read_lock_ptr, rel);    \
} while (0)

Definition at line 190 of file spinlock.h.

#define arch_spin_is_contended   arch_spin_is_contended

Definition at line 114 of file spinlock.h.

#define arch_spin_lock_init

(

x

)

((x)->lock = 0)

Definition at line 19 of file spinlock.h.

#define arch_spin_relax

(

lock

)

cpu_relax()

Definition at line 287 of file spinlock.h.

#define arch_write_can_lock

(

rw

)

(*(volatile int *)(rw) == 0)

Definition at line 143 of file spinlock.h.

#define arch_write_lock

(

l

)

Value:

({                                          \
	__u64 ia64_val, ia64_set_val = ia64_dep_mi(-1, 0, 31, 1);          \
	__u32 *ia64_write_lock_ptr = (__u32 *) (l);                    \
    do {                                        \
        while (*ia64_write_lock_ptr)                        \
            ia64_barrier();                         \
        ia64_val = ia64_cmpxchg4_acq(ia64_write_lock_ptr, ia64_set_val, 0); \
    } while (ia64_val);                             \
})

Definition at line 248 of file spinlock.h.

#define arch_write_lock_flags	(		l,
			flags
	)		arch_write_lock(l)

Definition at line 246 of file spinlock.h.

#define arch_write_relax

(

lock

)

cpu_relax()

Definition at line 289 of file spinlock.h.

#define arch_write_trylock

(

rw

)

Value:

({                                  \
	__u64 ia64_val;                            \
	__u64 ia64_set_val = ia64_dep_mi(-1, 0, 31,1);         \
    ia64_val = ia64_cmpxchg4_acq((__u32 *)(rw), ia64_set_val, 0);   \
    (ia64_val == 0);                        \
})

Definition at line 259 of file spinlock.h.

#define TICKET_BITS   15

Definition at line 37 of file spinlock.h.

#define TICKET_MASK   ((1 << TICKET_BITS) - 1)

Definition at line 38 of file spinlock.h.

#define TICKET_SHIFT   17

Definition at line 36 of file spinlock.h.