To avoid some near-polling in netconn_delete(), there is now (in CVS) a new
function that ports must implement, declared in lwip/sys.h:
u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg);
This function must attempt to retrieve a message, or if none is present, it
should return immediately with SYS_MBOX_EMPTY.
As an alternative, the port can define a function-like macro in
arch/sys_arch.h so that calls to sys_arch_mbox_tryfetch can be something
more arbitrary than a function.
Jifl
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