[C++][IPC] ReadMessage could optionally take body_length

[pitrou]

Describe the enhancement requested

ReadMessageAsync takes a body_length parameter and reads Message metadata + body in one go, but the blocking version ReadMessage reads the body length from the Message and issues a second read for the body.

We could add a ReadMessage overload that takes the body length as parameter and does a single read the async version does. It can then be used in the IPC file reader so that less IOs are issued (though it won't make a difference in the common case where the IPC file is memory-mapped).

Component(s)

C++

[rishabhjain1712]

hi @pitrou id like to work on this issue
@rishabhjain1712 to keep track

[pitrou]

@rishabhjain1712 Feel free to submit a PR!

[abhishek593]

take

[abhishek593]

@pitrou I have submitted a PR for this.

[abhishek593]

@pitrou Can you please review the PR? Thanks!