How to use the same memory in multi threads?

[kster59]

Most other RTOS have mutex/semaphores and mailboxes for passing data. Usually you would just pass a pointer into the mailbox rather than the entire large byte array.

I ran into this kind of problem with xmos software defined peripherals. If I have a communication thread then it's difficult to pass large amounts of data quickly enough to make use of the real time features.

I can understand Xc was designed so you could chain multiple cores together and then it makes sense but on a single shared memory core you should have access to data without double copies.

One thing that would be a big improvement is a deeper FIFO on some ports. Right now it only has the single shadow register.

Typically processors have deep FIFO for things like usb, ethernet, spi, timers, etc.

I have found it's extremely difficult to do high speed input on a xmos device due to the lack of fifo relying only on the single shadow register (eg spi slave). High speed output is ok (eg spi master).