[webkit-dev] Encoding and decoding ProcessID

[Adrien Destugues]

Hi there,

We are finally starting to look into moving the Haiku port to WebKit2.

We have hit one little problem I'm not sure how to solve. Our pid_t on
32bit Haiku is declared as a signed long integer (this is for legacy
reasons and not something we can fix easily). Our uint32_t is a signed
integer (not long). This creates a compilation error when using pid_t
with IPC::Encoder, because none of the encode() functions match when
trying to pass a pid_t in our case.

Our options seems to be:
- Cast pid_t to int32_t when encoding it. I fear this would break other
  platforms if they decide to use a 64bit pid_t, for example
- Add an encode(pid_t) to the IPC::Encoder. I fear on other platforms it
  would complain that this is the same as encode(int32_t) and break the
  build
- Define WTF::ProcessID as int32_t instead of pid_t, which I think could
  work, afte rfixing some compiler warnings (we will need to cast back
  to pid_t when passing it to OS functions, I think)

What do you think about it?

one example where encoding a pid is
Source/WebKit/NetworkProcess/NetworkResourceLoadParameters.cpp

-- 
Adrien.