willemt
how
if I have a buff like below:
**12 ^ | A Region B is not used. Now, if I want to offer more than 2 bytes for example 4 bytes "3456", the bipbuf_offer will return 0. But there are enough buffer for 4bytes, it can offer region B and the result will like below:
345612** ^ ^ | | B A
Region B is not a second equal sized buffer, that is allocated when the first buffer is full, but just a second consecutive region at the beginning of the ring buffer, that comes into use when the buffer is about to "roll over". Region B allows the ring buffer to skip the last few bytes at the end of the buffer. This guarantees that all returned memory blocks by the ring buffer are consecutive.
