3 files changed, 82 insertions, 0 deletions
diff --git a/interop.h b/interop.h
new file mode 100644
index 0000000..f45e69a
--- /dev/null
+++ b/interop.h
@@ -0,0 +1,14 @@
+// 11 december 2015
+
+#ifndef __UI_INTEROP_H__
+#define __UI_INTEROP_H__
+
+#include <stdint.h>
+
+extern char *interopInit(void);
+extern void interopFreeStr(char *);
+extern void interopRun(void);
+extern void interopQuit(void);
+extern void interopQueueMain(uintptr_t);
+
+#endif
diff --git a/link_unix.go b/link_unix.go
new file mode 100644
index 0000000..9d270bf
--- /dev/null
+++ b/link_unix.go
@@ -0,0 +1,8 @@
+// +build !windows
+// +build !darwin
+
+// 11 december 2015
+
+package ui
+
+// #cgo LDFLAGS: -L. -lui -lpthread
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..154192d
--- /dev/null
+++ b/main.go
@@ -0,0 +1,60 @@
+// 11 december 2015
+
+package ui
+
+import (
+	"errors"
+)
+
+// #include "interop.h"
+import "C"
+
+// Main initializes package ui, runs f to set up the program,
+// and executes the GUI main loop. f should set up the program's
+// initial state: open the main window, create controls, and set up
+// events. It should then return, at which point Main will
+// process events until Quit is called, at which point Main will return
+// nil. If package ui fails to initialize, Main returns an appropriate
+// error.
+func Main(f func()) error {
+	errchan := make(chan error)
+	go start(errchan, f)
+	return <-errchan
+}
+
+func start(errchan chan error, f func()) {
+	estr := C.interopInit()
+	if estr != "" {
+		errchan <- errors.New(C.GoString(estr))
+		C.interopFreeStr(estr)
+		return
+	}
+	QueueMain(f)
+	C.interopRun()
+	errchan <- nil
+}
+
+// Quit queues an exit from the GUI thread. It does not exit the
+// program. Quit must be called from the GUI thread.
+func Quit() {
+	C.interopQuit()
+}
+
+// QueueMain queues f to be executed on the GUI thread when
+// next possible. It returns immediately; that is, it does not wait
+// for the function to actually be executed. QueueMain is the only
+// function that can be called from other goroutines, and its
+// primary purpose is to allow communication between other
+// goroutines and the GUI thread. Calling QueueMain after Quit
+// has been called results in undefined behavior.
+func QueueMain(f func()) {
+	n := interoperAdd(f)
+	C.interopQueueMain(n)
+}
+
+//export interopDoQueued
+func interopDoQueued(n C.uintptr_t) {
+	ff := interoperTake(n)
+	f := ff.(func())
+	f()
+}