MessageQ -- message allocation without a heap

b d

Other Parts Discussed in Thread: TMS320C6674

In (SPRUG06) DSP BIOS PIC And IO Users Guide

section 3.2.4.2 MessageQ Allocation Without a Heap
" ... the transport may internally call MessageQ_free() and encounter an error."

Q. Why would the transport call a "free" on what it should be able to recognize as a non heap item?

And if it does, what are the consequences? Will it halt the system or register an error is some database?

over 14 years ago

0 Shreyas Oppanthaya over 14 years ago

Genius 4375 points

The statement ".. the transport may internally call MessageQ_free()..." only applies to copy-based MessageQ transports. The only device supported by IPC that uses a copy based transport is Concerto.

That said, you have a point--the transport could & should check the message header to see whether it should free it. We will fix the documentation in a future IPC release.

Regards,

Shreyas

0 b d over 14 years ago in reply to Shreyas Oppanthaya

Prodigy 160 points

Would copy-based MessageQ not work on for example the TMS320C6674? We would prefer not to use the generic Heap manager but rather allocate our own buffers.

0 judahvang over 14 years ago in reply to b d

TI__Mastermind 32475 points

There is no existing copy based transport for C6674 delivered by IPC. If you write your own copy based transport for the device then it should work. You could then check whether a message was statically allocated and free/not free based upon the check within the transport.

Judah

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MessageQ -- message allocation without a heap