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e8b31e8482
- Updated rwlock's so they can be safely initialized in ctors. git-svn-id: https://outreach.scidac.gov/svn/spl/trunk@96 7e1ea52c-4ff2-0310-8f11-9dd32ca42a1c
72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
#ifndef _SPL_RWLOCK_H
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#define _SPL_RWLOCK_H
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/rwsem.h>
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#include <asm/current.h>
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#include <sys/types.h>
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#include <sys/kmem.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum {
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RW_DRIVER = 2, /* driver (DDI) rwlock */
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RW_DEFAULT = 4 /* kernel default rwlock */
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} krw_type_t;
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typedef enum {
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RW_WRITER,
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RW_READER
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} krw_t;
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#define RW_MAGIC 0x3423645a
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#define RW_POISON 0xa6
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typedef struct {
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int32_t rw_magic;
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int32_t rw_name_size;
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char *rw_name;
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struct rw_semaphore rw_sem;
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struct task_struct *rw_owner; /* holder of the write lock */
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} krwlock_t;
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extern void __rw_init(krwlock_t *rwlp, char *name, krw_type_t type, void *arg);
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extern void __rw_destroy(krwlock_t *rwlp);
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extern int __rw_tryenter(krwlock_t *rwlp, krw_t rw);
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extern void __rw_enter(krwlock_t *rwlp, krw_t rw);
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extern void __rw_exit(krwlock_t *rwlp);
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extern void __rw_downgrade(krwlock_t *rwlp);
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extern int __rw_tryupgrade(krwlock_t *rwlp);
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extern kthread_t *__rw_owner(krwlock_t *rwlp);
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extern int __rw_read_held(krwlock_t *rwlp);
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extern int __rw_write_held(krwlock_t *rwlp);
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extern int __rw_lock_held(krwlock_t *rwlp);
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#define rw_init(rwlp, name, type, arg) \
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({ \
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if ((name) == NULL) \
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__rw_init(rwlp, #rwlp, type, arg); \
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else \
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__rw_init(rwlp, name, type, arg); \
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})
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#define rw_destroy(rwlp) __rw_destroy(rwlp)
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#define rw_tryenter(rwlp, rw) __rw_tryenter(rwlp, rw)
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#define rw_enter(rwlp, rw) __rw_enter(rwlp, rw)
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#define rw_exit(rwlp) __rw_exit(rwlp)
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#define rw_downgrade(rwlp) __rw_downgrade(rwlp)
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#define rw_tryupgrade(rwlp) __rw_tryupgrade(rwlp)
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#define rw_owner(rwlp) __rw_owner(rwlp)
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#define RW_READ_HELD(rwlp) __rw_read_held(rwlp)
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#define RW_WRITE_HELD(rwlp) __rw_write_held(rwlp)
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#define RW_LOCK_HELD(rwlp) __rw_lock_held(rwlp)
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SPL_RWLOCK_H */
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