Allow arbitrary number of connections (#13)

* refactor plasma to use an event loop

* unify comment style

* Clean up Makefile flags.

* Randomize socket names in tests so multiple copies of the tests can be run in parallel without conflict.

src/event_loop.h

@@ -0,0 +1,36 @@
+#ifndef EVENT_LOOP_H
+#define EVENT_LOOP_H
+
+#include <poll.h>
+
+#include "utarray.h"
+#include "plasma.h"
+#include "plasma_manager.h"
+
+typedef struct {
+  /* The type of connection (e.g. redis, client, manager, data transfer). */
+  int type;
+  /* If type is data transfer, this contains information about the status
+   * of the transfer. */
+	data_connection connection;
+} event_loop_item;
+
+typedef struct {
+  /* Array of event_loop_items that hold information for connections. */
+  UT_array *items; 
+  /* Array of file descriptors that are waiting, corresponding to items. */
+  UT_array *waiting; 
+} event_loop;
+
+/* Event loop functions. */
+void event_loop_init(event_loop *loop);
+void event_loop_free(event_loop *loop);
+int64_t event_loop_attach(event_loop *loop, int type, data_connection* connection, int fd, int events);
+void event_loop_detach(event_loop *loop, int64_t index, int shall_close);
+int event_loop_poll(event_loop *loop);
+int64_t event_loop_size(event_loop *loop);
+struct pollfd *event_loop_get(event_loop *loop, int64_t index);
+void event_loop_set_connection(event_loop *loop, int64_t index, const data_connection* conn);
+data_connection *event_loop_get_connection(event_loop *loop, int64_t index);
+
+#endif