This library provides a thread safe event loop for guile-2.2 (event-loop.scm) with support for watches on ports/file descriptors and timeouts, and which permits events to be posted by other tasks. This includes tasks running on other threads. It also provides a coroutines interface (coroutines.scm) which provides await semantics on such events, so as to avoid inversion of control (aka "callback hell"), and provision for using these in conjunction with guile-2.2/3.0's suspendable ports (await-ports.scm). It requires guile-2.2 >= 2.1.3.

This library (guile-a-sync2) also supports guile-3.0 >= 2.9.1, but when doing so uses guile's catch/throw interface for exceptions. A separate guile-a-sync3 library is available for guile-3.0 which allows use of guile-3.0's exception objects; but if you want user code which will run with both guile-2.2 and guile-3.0, use this library instead.

See the documentation mentioned below for further details, and the docs/example.scm and docs/example-glib.scm files.

A separate guile-a-sync library is available for guile-2.0 here: https://github.com/ChrisVine/guile-a-sync , and guile-a-sync3 is available here: https://github.com/ChrisVine/guile-a-sync3 . This library (guile-a-sync2) and guile-a-sync are parallel installable. This library is also parallel installable with guile-a-sync3 where this library is compiled against guile-2.2, but not where this library is compiled against guile-3.0.

When first run from git, or a tarball obtained from github, it is necessary to set up autotools. This can be done with:

./autogen.sh --prefix=/usr

or on a 64-bit system, probably:

./autogen.sh --prefix=/usr --libdir=/usr/lib64

This generates a configure script and installs libtool, and will then run the configure script. By default the configure script will look first for guile-3.0 >= 2.9.1 and if that is not found then for guile-2.2 >= 2.1.3. This can be overriden by passing autogen.sh the --with-guile=2.2 or --with-guile=3.0 options to choose guile-2.2 or guile-3.0 explicitly.

Subsequent configuration can be done just with

./configure --prefix=/usr

and

./configure --prefix=/usr --libdir=/usr/lib64

respectively, adding the --with-guile option as necessary.

The library as compiled for guile-2.2 can be parallel installed with the library as compiled for guile-3.0. The pkg-config file produced when compiled against guile-2.2 is guile-a-sync2.pc, and when compiled against guile-3.0 is guile-a-sync2-30.pc, so the pkg-config files can be separately interrogated.

On a 64 bit system you may also need to include -fPIC in your CFLAGS options if libtool doesn't do that for you (libtool normally does when necessary).

After compiling, install with 'make install' as root.

By default, the scheme files provided by this library will be pre-compiled to guile bytecode and installed with the scheme files in guile's object file directory. If that behaviour is not wanted (say, because a unix-like compile environment is not available which is acceptable to the compile scripts), then configure with the --disable-compile-to-bytecode option.

Html documentation is available after installation in the default html directory for the target installation (normally at $(prefix)/share/doc/guile-a-sync2/html/index.html).

In addition, the documentation can be viewed at github at: https://github.com/ChrisVine/guile-a-sync2/wiki