[lwip-devel] [bug #23408] Deadlock on sys_mbox_post sys_mbox_fetch

[Vadim G Melihow]

Follow-up Comment #3, bug #23408 (project lwip):

version 1.3.0

ok. 2 threads.

1st   -  read from msgbox
2nd    - write 

Situation: msgbox is fully empty

thread #1 (reader) block mbox->mail


sys_arch_mbox_fetch(struct sys_mbox *mbox, void **msg, u32_t timeout)
.
.
#check for empty
while (mbox->first == mbox->last) 
{
        sys_sem_signal(mbox->mutex);
# writers are waked.
# Between this operations write thread(s) post messages. Fill all msgbox and 
lock mbox->mail
        sys_arch_sem_wait(mbox->mail, 0); <--- DEADLOCK 
        sys_arch_sem_wait(mbox->mutex, 0);
}

perhaps I missed something....



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