patacongo commented on a change in pull request #4720:
URL: https://github.com/apache/incubator-nuttx/pull/4720#discussion_r735231880
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File path: fs/mqueue/mq_open.c
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@@ -165,7 +165,7 @@ static int file_mq_vopen(FAR struct file *mq, FAR const
char *mq_name,
FAR struct mqueue_inode_s *msgq;
FAR struct mq_attr *attr = NULL;
struct inode_search_s desc;
- char fullpath[MAX_MQUEUE_PATH];
Review comment:
In #4698
#define MAX_MQUEUE_PATH (sizeof(CONFIG_FS_MQUEUE_MPATH) + NAME_MAX)
First, the use of sizeof on an integer constant seems a little odd and
probably not portable.
Under GNU/Linux, I recall that NAME_MAX is 4Kb. If someone needed GNU/Linux
compatibility, then that would be quite large.
> MAX_MQUEUE_PATH is just 64 bytes, is it good to allocate a small temp
buffer every time?'
The message queue implementation uses pre-allocated data as much as possible
for performance reasons; messaging operations must be very fast. But this
stack allocation is in fs_vopen(). I would not think that an allocation while
opening a named message queue would have any performance implication since that
is a rare event.
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