Add and del ccnet compilation dependency in seafile (#347)

* Add and del ccnet compilation dependency in seafile

* Del import ccnet

* Del extra ccnet compilation dependencies

* Del support WIN32

lib/timer.c

@@ -0,0 +1,76 @@
+/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+
+#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#include <event2/event.h>
+#include <event2/event_compat.h>
+#include <event2/event_struct.h>
+#else
+#include <event.h>
+#endif
+
+#include <sys/time.h>
+
+#include "utils.h"
+
+#include "timer.h"
+
+struct CcnetTimer
+{
+    struct event   event;
+    struct timeval tv;
+    TimerCB        func;
+    void          *user_data;
+    uint8_t        inCallback;
+};
+
+static void
+timer_callback (evutil_socket_t fd, short event, void *vtimer)
+{
+    int more;
+    struct CcnetTimer *timer = vtimer;
+
+    timer->inCallback = 1;
+    more = (*timer->func) (timer->user_data);
+    timer->inCallback = 0;
+
+    if (more)
+        evtimer_add (&timer->event, &timer->tv);
+    else
+        ccnet_timer_free (&timer);
+}
+
+void
+ccnet_timer_free (CcnetTimer **ptimer)
+{
+    CcnetTimer *timer;
+
+    /* zero out the argument passed in */
+    g_return_if_fail (ptimer);
+
+    timer = *ptimer;
+    *ptimer = NULL;
+
+    /* destroy the timer directly or via the command queue */
+    if (timer && !timer->inCallback)
+    {
+        event_del (&timer->event);
+        g_free (timer);
+    }
+}
+
+CcnetTimer*
+ccnet_timer_new (TimerCB         func,
+                 void           *user_data,
+                 uint64_t        interval_milliseconds)
+{
+    CcnetTimer *timer = g_new0 (CcnetTimer, 1);
+
+    timer->tv = timeval_from_msec (interval_milliseconds);
+    timer->func = func;
+    timer->user_data = user_data;
+
+    evtimer_set (&timer->event, timer_callback, timer);
+    evtimer_add (&timer->event, &timer->tv);
+
+    return timer;
+}