track embedded python distribution

python/gevent/libev/_corecffi_source.c

@@ -0,0 +1,45 @@
+// passed to the real C compiler
+#define LIBEV_EMBED 1
+
+#ifdef _WIN32
+#define EV_STANDALONE 1
+#include "libev_vfd.h"
+#endif
+
+
+#include "libev.h"
+
+static void
+_gevent_noop(struct ev_loop *_loop, struct ev_timer *w, int revents) { }
+
+void (*gevent_noop)(struct ev_loop *, struct ev_timer *, int) = &_gevent_noop;
+static int (*python_callback)(void* handle, int revents);
+static void (*python_handle_error)(void* handle, int revents);
+static void (*python_stop)(void* handle);
+
+static void _gevent_generic_callback(struct ev_loop* loop,
+									 struct ev_watcher* watcher,
+									 int revents)
+{
+    void* handle = watcher->data;
+    int cb_result = python_callback(handle, revents);
+    switch(cb_result) {
+        case -1:
+            // in case of exception, call self.loop.handle_error;
+            // this function is also responsible for stopping the watcher
+            // and allowing memory to be freed
+            python_handle_error(handle, revents);
+        break;
+        case 0:
+            // Code to stop the event. Note that if python_callback
+            // has disposed of the last reference to the handle,
+            // `watcher` could now be invalid/disposed memory!
+            if (!ev_is_active(watcher)) {
+                python_stop(handle);
+            }
+        break;
+        default:
+            assert(cb_result == 1);
+            // watcher is already stopped and dead, nothing to do.
+    }
+}