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kernel: msg_q: Add routine to fetch basic attrs from message queue.

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For posix layer implementation of message queue, we need to fetch
basic attributes of message queue. Currently this routine is not
present in Zephyr. So adding this routing into message queue.

Signed-off-by: Youvedeep Singh <youvedeep.singh@intel.com>
This commit is contained in:
Youvedeep Singh 2018-03-19 20:02:40 +05:30 • committed by Anas Nashif
commit 188c1ab5ca
4 changed files with 87 additions and 0 deletions
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19
include/kernel.h
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@ -2865,6 +2865,12 @@ struct k_msgq {
#define K_MSGQ_INITIALIZER DEPRECATED_MACRO _K_MSGQ_INITIALIZER
struct k_msgq_attrs {
size_t msg_size;
u32_t max_msgs;
u32_t used_msgs;
};
/**
* INTERNAL_HIDDEN @endcond
*/
@ -2985,6 +2991,19 @@ __syscall void k_msgq_purge(struct k_msgq *q);
*/
__syscall u32_t k_msgq_num_free_get(struct k_msgq *q);
/**
* @brief Get basic attributes of a message queue.
*
* This routine fetches basic attributes of message queue into attr argument.
*
* @param q Address of the message queue.
* @param attrs pointer to message queue attribute structure.
*
* @return N/A
*/
__syscall void k_msgq_get_attrs(struct k_msgq *q, struct k_msgq_attrs *attrs);
static inline u32_t _impl_k_msgq_num_free_get(struct k_msgq *q)
{
return q->max_msgs - q->used_msgs;