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usb_buf: count number of elements in queue

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This is in preparation for limiting the maximum queue length

Change-Id: I7cb184d7a1ccb519010a2f3e3295cc3a5fbf8052
Related: OS#4251
This commit is contained in:
Harald Welte
2019-12-14 19:07:57 +01:00
parent 271be9d181
commit f4a625be53
6 changed files with 58 additions and 13 deletions
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43
firmware/libosmocore/include/osmocom/core/msgb.h
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@@ -80,6 +80,49 @@ extern int msgb_resize_area(struct msgb *msg, uint8_t *area,
extern struct msgb *msgb_copy(const struct msgb *msg, const char *name);
static int msgb_test_invariant(const struct msgb *msg) __attribute__((pure));
/*! Free all msgbs from a queue built with msgb_enqueue().
* \param[in] queue list head of a msgb queue.
*/
static inline void msgb_queue_free(struct llist_head *queue)
{
struct msgb *msg;
while ((msg = msgb_dequeue(queue))) msgb_free(msg);
}
/*! Enqueue message buffer to tail of a queue and increment queue size counter
* \param[in] queue linked list header of queue
* \param[in] msg message buffer to be added to the queue
* \param[in] count pointer to variable holding size of the queue
*
* The function will append the specified message buffer \a msg to the queue
* implemented by \ref llist_head \a queue using function \ref msgb_enqueue_count,
* then increment \a count
*/
static inline void msgb_enqueue_count(struct llist_head *queue, struct msgb *msg,
unsigned int *count)
{
msgb_enqueue(queue, msg);
(*count)++;
}
/*! Dequeue message buffer from head of queue and decrement queue size counter
* \param[in] queue linked list header of queue
* \param[in] count pointer to variable holding size of the queue
* \returns message buffer (if any) or NULL if queue empty
*
* The function will remove the first message buffer from the queue
* implemented by \ref llist_head \a queue using function \ref msgb_enqueue_count,
* and decrement \a count, all if queue is not empty.
*/
static inline struct msgb *msgb_dequeue_count(struct llist_head *queue,
unsigned int *count)
{
struct msgb *msg = msgb_dequeue(queue);
if (msg)
(*count)--;
return msg;
}
#ifdef MSGB_DEBUG
#include <osmocom/core/panic.h>
#define MSGB_ABORT(msg, fmt, args ...) do { \