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fd: predict in fdrop

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This commit is contained in:
mjg 2020-07-30 22:13:15 +00:00
parent 10c28d28ee
commit 5f0b88635b
1 changed files with 10 additions and 9 deletions
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19
sys/sys/file.h
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@ -279,21 +279,22 @@ int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
struct vnode **vpp);
static __inline int
_fnoop(void)
{
return (0);
}
static __inline __result_use_check bool
fhold(struct file *fp)
{
return (refcount_acquire_checked(&fp->f_count));
}
#define fdrop(fp, td) \
(refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
#define fdrop(fp, td) ({ \
struct file *_fp; \
int _error; \
\
_error = 0; \
_fp = (fp); \
if (__predict_false(refcount_release(&_fp->f_count))) \
_error = _fdrop(_fp, td); \
_error; \
})
static __inline fo_rdwr_t fo_read;
static __inline fo_rdwr_t fo_write;