Quelle cgroup_refcnt.h Sprache: C

/**
* css_get - obtain a reference on the specified css
* @css: target css
*
* The caller must already have a reference.
*/
CGROUP_REF_FN_ATTRS
void css_get(struct cgroup_subsys_state *css)
{
if (!(css->flags & CSS_NO_REF))
  percpu_ref_get(&css->refcnt);
}
CGROUP_REF_EXPORT(css_get)

/**
* css_get_many - obtain references on the specified css
* @css: target css
* @n: number of references to get
*
* The caller must already have a reference.
*/
CGROUP_REF_FN_ATTRS
void css_get_many(struct cgroup_subsys_state *css, unsigned int n)
{
if (!(css->flags & CSS_NO_REF))
  percpu_ref_get_many(&css->refcnt, n);
}
CGROUP_REF_EXPORT(css_get_many)

/**
* css_tryget - try to obtain a reference on the specified css
* @css: target css
*
* Obtain a reference on @css unless it already has reached zero and is
* being released.  This function doesn't care whether @css is on or
* offline.  The caller naturally needs to ensure that @css is accessible
* but doesn't have to be holding a reference on it - IOW, RCU protected
* access is good enough for this function.  Returns %true if a reference
* count was successfully obtained; %false otherwise.
*/
CGROUP_REF_FN_ATTRS
bool css_tryget(struct cgroup_subsys_state *css)
{
if (!(css->flags & CSS_NO_REF))
  return percpu_ref_tryget(&css->refcnt);
return true;
}
CGROUP_REF_EXPORT(css_tryget)

/**
* css_tryget_online - try to obtain a reference on the specified css if online
* @css: target css
*
* Obtain a reference on @css if it's online.  The caller naturally needs
* to ensure that @css is accessible but doesn't have to be holding a
* reference on it - IOW, RCU protected access is good enough for this
* function.  Returns %true if a reference count was successfully obtained;
* %false otherwise.
*/
CGROUP_REF_FN_ATTRS
bool css_tryget_online(struct cgroup_subsys_state *css)
{
if (!(css->flags & CSS_NO_REF))
  return percpu_ref_tryget_live(&css->refcnt);
return true;
}
CGROUP_REF_EXPORT(css_tryget_online)

/**
* css_put - put a css reference
* @css: target css
*
* Put a reference obtained via css_get() and css_tryget_online().
*/
CGROUP_REF_FN_ATTRS
void css_put(struct cgroup_subsys_state *css)
{
if (!(css->flags & CSS_NO_REF))
  percpu_ref_put(&css->refcnt);
}
CGROUP_REF_EXPORT(css_put)

/**
* css_put_many - put css references
* @css: target css
* @n: number of references to put
*
* Put references obtained via css_get() and css_tryget_online().
*/
CGROUP_REF_FN_ATTRS
void css_put_many(struct cgroup_subsys_state *css, unsigned int n)
{
if (!(css->flags & CSS_NO_REF))
  percpu_ref_put_many(&css->refcnt, n);
}
CGROUP_REF_EXPORT(css_put_many)

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