This removes all signal handling code from os_unix.c to os/signal.c. Now signal
handling is done like this:
- Watchers for signals are registered with libuv default event loop
- `event_poll` continuously calls `poll_uv_loop` to produce events until it
receives user input, SIGINT or a timeout
- Any signals received in `poll_uv_loop` will push events to a queue that is
drained and processed by `event_poll`
Signals aren't handled directly in the libuv callback to avoid recursion in the
event loop(which isn't supported by libuv).
The same principle will apply to other events in the future: Push to a queue
from a libuv callback and drain it from `event_poll`
The functions `mch_inchar`, `mch_breakcheck`, `mch_char_avail` were
reimplemented on top of libuv. Here's how it works:
- When Neovim needs to wait for characters, it will transfer control to libuv
event loop.
- When the libuv event loop gets user input, it will transfer control back to
Neovim
- Neovim uses the `input_read` function to get the actual data read by libuv.
With this scheme its possible to keep Neovim single-threaded while enjoying the
benefits provided by libuv.
This commit leaves SIGWINCH broken for now
See #137 for the issue.
Every header in the proto directory was:
* Given include guards in the form
#ifndef NEOVIM_FILENAME_H
#define NEOVIM_FILENAME_H
...
#endif /* NEOVIM_FILENAM_H */
* Renamed from *.pro -> *.h
* Moved from src/proto/ to src/
This would have caused conficts with some existing headers in src/;
rather than merge these conflicts now (which is a whole other can of
worms involving multiple and conditional inclusion), any header in src/
with a conflicting name was renamed from *.h -> *_defs.h (which may or
may not actually describe its purpose, the change is purely a
namespacing issue).
Once all of these changes were made a script was developed to determine
what #includes needed to be added to each source file to describe its
dependencies and allow it to compile; because the script is so short
and I'll just list it here:
#! /bin/bash
cd $(dirname $0)
# Scrapes `make` output for provided error messages and outputs #includes
# needed to resolve them.
# $1 : part of the clang error message between filename and identifier
list_missing_includes() {
for file_missing_pair in $(CC=clang make 2>&1 >/dev/null | sed -n "s/\/\(.*\.[hc]\).*$1.*'\(.*\)'.*/\1:\2/p"); do
fields=(${file_missing_pair//:/ })
source_file=${fields[0]}
missing_func=${fields[1]}
# Try to find the declaration of the missing function.
echo $(basename $source_file) \
\#include \"$(grep -r "\b$missing_func __ARGS" | sed -n "s/.*\/\(.*\)\:.*/\1/p")\"
# Remove duplicates
done | sort | uniq
}
echo "Finding missing function prototypes..."
list_missing_includes "implicit declaration of function"
echo "Finding missing identifier declarations..."
list_missing_includes "use of undeclared identifier"
Each list of required headers was added by hand in the following format:
#include "vim.h"
#include "*_defs.h"
#include "filename.h"
/* All other includes in same module here, in alphabetical order. */
/* All includes from other modules (e.g. "os/*.h") here in alphabetical
* order. */
cproto (http://invisible-island.net/cproto/) was used to do the bulk of
the work in batch; even the most recent version had some issues with
typedef'd parameters; a quick "patch" was to modify `lex.l` to
explicitly include all vim typedefs as known types. One example from
`vim.h` is
typedef unsigned char char_u;
which was added in `lex.l` as
<INITIAL>char_u { save_text_offset(); return T_CHAR; }
Even with these changes there were some problems:
* Two files (`mbyte.c` and `os_unix.c`) were not cleanly converted.
* Any function with the `UNUSED` macro in its parameter list was not converted.
Rather than spend more time fixing the automated approach, the two files
`mbyte.c` and `os_unix.c` were converted by hand.
The `UNUSED` macros were compiler specific, and the alternative, generic
version would require a different syntax, so in order to simplify the
conversion all uses of `UNUSED` were stripped, and then the sources were
run back through cproto. It is planned to reconsider each use of
`UNUSED` manually using a new macro definition.
- Cleanup source tree, leaving only files necessary for compilation/testing
- Process files through unifdef to remove tons of FEAT_* macros
- Process files through uncrustify to normalize source code formatting.
- Port the build system to cmake
