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shell: Fix log messages queueing for multiple instances

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Shell log backend was using k_fifo to enqueue log messages.
It was using field in log message that was used for same
purpose in log_core before passing message to backends.
However, this method supported only single shell as
other shell was corruption the fifo because field was
reused.

Modified shell log backend to use k_msgq for pending
messages.

Signed-off-by: Krzysztof Chruscinski <krzysztof.chruscinski@nordicsemi.no>
This commit is contained in:
Krzysztof Chruscinski 2018-11-22 11:34:41 +01:00 • committed by Anas Nashif
commit 96a610b736
2 changed files with 41 additions and 19 deletions
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53
subsys/shell/shell_log_backend.c
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@ -26,41 +26,62 @@ void shell_log_backend_enable(const struct shell_log_backend *backend,
static struct log_msg *msg_from_fifo(const struct shell_log_backend *backend)
{
struct log_msg *msg = k_fifo_get(backend->fifo, K_NO_WAIT);
struct log_msg *msg;
int err;
if (msg) {
atomic_dec(&backend->control_block->cnt);
}
err = k_msgq_get(backend->msgq, &msg, K_NO_WAIT);
return msg;
return (err == 0) ? msg : NULL;
}
static void fifo_flush(const struct shell_log_backend *backend)
{
struct log_msg *msg = msg_from_fifo(backend);
struct log_msg *msg;
/* Flush log messages. */
while (msg) {
while ((msg = msg_from_fifo(backend)) != NULL) {
log_msg_put(msg);
msg = msg_from_fifo(backend);
}
}
static void msg_to_fifo(const struct shell *shell,
struct log_msg *msg)
{
atomic_val_t cnt;
int err;
k_fifo_put(shell->log_backend->fifo, msg);
err = k_msgq_put(shell->log_backend->msgq, &msg, K_NO_WAIT);
cnt = atomic_inc(&shell->log_backend->control_block->cnt);
switch (err) {
case 0:
break;
case -ENOMSG:
{
struct log_msg *old_msg;
/* If there is too much queued free the oldest one. */
if (cnt >= CONFIG_SHELL_MAX_LOG_MSG_BUFFERED) {
log_msg_put(msg_from_fifo(shell->log_backend));
if (IS_ENABLED(CONFIG_SHELL_STATS)) {
shell->stats->log_lost_cnt++;
/* drop one message */
old_msg = msg_from_fifo(shell->log_backend);
if (old_msg) {
log_msg_put(old_msg);
if (IS_ENABLED(CONFIG_SHELL_STATS)) {
shell->stats->log_lost_cnt++;
}
}
err = k_msgq_put(shell->log_backend->msgq, &msg, K_NO_WAIT);
if (err) {
/* Rather unusual sitaution as we just freed one element
* and there is no other context that puts into the
* mesq. */
__ASSERT_NO_MSG(0);
}
break;
}
default:
/* Other errors are not expected. */
__ASSERT_NO_MSG(0);
break;
}
}