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RTS functions interruptible
I've read various things about RTS functions with respect to interruptibility, including the information on the following page:
I'm interested to know which functions can be interrupted, especially functions like memcpy and strasg. The previous link reads that strasgi can be interrupted, but the sources bundled in the C6000 Code Generation Tools installer (version 7.3.7) explicitly use the DINT and RINT instructions in that function.
Is the information on this page (still) correct?
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Since you are new, I will be glad to put in a request to get this thread moved to the right forum. This is the C64x Single Core DSP Forum for device questions. You will get answers to Compiler tools questions in the TI C/C++ Compiler Forum under the Development Tools group.
The RTS utilities are included as source code in your installation in the same folder as the library .lib files. You can look through there for the facts on which functions are interruptible and the exact conditions under which they are interruptible.
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Please see http://processors.wiki.ti.com/index.php/Reentrant; it's not complete, but it's a start.
Generally speaking, if the interrupt service routine does nothing more than access its data buffer (and perhaps a flag or two) via a volatile-qualified type, it doesn't matter whether it interrupted an RTS function.
The cited article on reentrancy should not have said that malloc is usually safe to re-invoke while it is executing. You need to be sure that it has been carefully coded with that environment in mind. The problem is that it could have been in the middle of moving free-block links around so that the heap structure is temporarily in an inconsistent state, and the reentrant instance will make further changes that interfere with correct completion of the interrupted instance when it resumes. My own implementation of malloc has provisions to ensure reentrancy, but not all do.
Thanks for the answers so far.
My primary concern is not the reentrancy of functions in the RTS. I'm worried about not hitting my minimum required interrupt latency when any thread is calling functions from the RTS. The RTS is not compiled with the -miN compiler flag and it contains assembler code, so I must audit it to get any guarantees.
Please see this wiki page. -George
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