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kernel: remove k_object_access_revoke() as syscall

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Forthcoming patches will dual-purpose an object's permission
bitfield as also reference tracking for kernel objects, used to
handle automatic freeing of resources.

We do not want to allow user thread A to revoke thread B's access
to some object O if B is in the middle of an API call using O.

However we do want to allow threads to revoke their own access to
an object, so introduce a new API and syscall for that.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2018-04-13 13:15:28 -07:00 • committed by Andrew Boie
commit e9cfc54d00
7 changed files with 33 additions and 46 deletions
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17
include/kernel.h
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@ -223,13 +223,21 @@ static inline void _impl_k_object_access_grant(void *object,
/**
* @internal
*/
static inline void _impl_k_object_access_revoke(void *object,
struct k_thread *thread)
static inline void k_object_access_revoke(void *object,
struct k_thread *thread)
{
ARG_UNUSED(object);
ARG_UNUSED(thread);
}
/**
* @internal
*/
static inline void _impl_k_object_release(void *object)
{
ARG_UNUSED(object);
}
static inline void k_object_access_all_grant(void *object)
{
ARG_UNUSED(object);
@ -258,7 +266,10 @@ __syscall void k_object_access_grant(void *object, struct k_thread *thread);
* @param object Address of kernel object
* @param thread Thread to remove access to the object
*/
__syscall void k_object_access_revoke(void *object, struct k_thread *thread);
void k_object_access_revoke(void *object, struct k_thread *thread);
__syscall void k_object_release(void *object);
/**
* grant all present and future threads access to an object