endless-loop in buffered_channel::try_value_pop() about fiber HOT 7 CLOSED

I'm wondering, buffered_channel doesn't have a try_value_pop() member function.

from fiber.

My bad. I called try_pop (https://github.com/boostorg/fiber/blob/master/include/boost/fiber/buffered_channel.hpp#L374) which calls try_pop_ (https://github.com/boostorg/fiber/blob/master/include/boost/fiber/buffered_channel.hpp#L120) which calls try_value_pop_(https://github.com/boostorg/fiber/blob/master/include/boost/fiber/buffered_channel.hpp#L99). Here I ran in the endless loop.

from fiber.

could you provide test-code that demonstrates your problem

from fiber.

Here is the reproducer. The last output I get is:
ct2_inner calling tryp_pop
try_pop_: full=0 empty=0 capacity=1 closed=0 producers=0 consumers=0 consumer_idx_=0 slots_[0].cycle.load()=2
The try_pop call never returns.

reproducer.zip

from fiber.

buffered_channel's capacity must be a power of two - I've changed the test in the constructor

from fiber.

I have a use case for a capacity of 1, is it possible to relax this power-of-2 requirement?

from fiber.

Unfortunately no - buffered_channel requires a capacity of power of two because positions inside the buffer are calculated via shift operations (for performance reasons).

What is your use case for a capacity of two? Maybe unbuffered_channel is a option?

from fiber.