You are right, this will also work.
Even in lwIP 1.4.1 the prototype for these functions was: > err_t sys_sem_new(sys_sem_t *sem, u8_t count); > err_t sys_mbox_new(sys_mbox_t *mbox, int size); > > These functions clearly don't return anything else other than error and > the buffer for semaphore/mailbox has to be provided by user. > > These can work the way you describe but only if you define sys_sem_t > and sys_mbox_t to be pointers, which is not the best approach. If you > define them as storage with the same size and alignment as the "real" > semaphore/mailbox, then these functions can just construct the object > into the storage, with no memory allocation (except the storage for > mailbox contents). >
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