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Document new sys_arch_mbox_tryfetch requirement for ports

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jifl 2007-04-12 01:30:53 +00:00
parent 9bc49b3268
commit 9d43d74ee3
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doc/sys_arch.txt
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@ -99,6 +99,19 @@ The following functions must be implemented by the sys_arch:
Note that a function with a similar name, sys_mbox_fetch(), is Note that a function with a similar name, sys_mbox_fetch(), is
implemented by lwIP. implemented by lwIP.
- u32_t sys_arch_mbox_tryfetch(sys_mbox_t mbox, void **msg)
This is similar to sys_arch_mbox_fetch, however if a message is not
present in the mailbox, it immediately returns with the code
SYS_MBOX_EMPTY.
To allow for efficient implementations, this can be defined as a
function-like macro in sys_arch.h instead of a normal function. For
example, a naive implementation could be:
#define sys_arch_mbox_tryfetch(mbox,msg) \
sys_arch_mbox_fetch(mbox,msg,1)
although this would introduce unnecessary delays.
- struct sys_timeouts *sys_arch_timeouts(void) - struct sys_timeouts *sys_arch_timeouts(void)
Returns a pointer to the per-thread sys_timeouts structure. In lwIP, Returns a pointer to the per-thread sys_timeouts structure. In lwIP,