1 files changed, 135 insertions, 0 deletions
diff --git a/libglusterfs/src/glusterfs/gf-event.h b/libglusterfs/src/glusterfs/gf-event.h
new file mode 100644
index 00000000000..5d92a2dd285
--- /dev/null
+++ b/libglusterfs/src/glusterfs/gf-event.h
@@ -0,0 +1,135 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#ifndef _GF_EVENT_H_
+#define _GF_EVENT_H_
+
+#include <pthread.h>
+#include "list.h"
+
+struct event_pool;
+struct event_ops;
+struct event_slot_poll;
+struct event_slot_epoll;
+struct event_data {
+    int idx;
+    int gen;
+} __attribute__((__packed__, __may_alias__));
+
+typedef int (*event_handler_t)(int fd, int idx, int gen, void *data,
+                               int poll_in, int poll_out, int poll_err,
+                               char event_thread_exit);
+
+#define EVENT_EPOLL_TABLES 1024
+#define EVENT_EPOLL_SLOTS 1024
+#define EVENT_MAX_THREADS 1024
+
+struct event_pool {
+    struct event_ops *ops;
+
+    int fd;
+    int breaker[2];
+
+    int count;
+    struct event_slot_poll *reg;
+    struct event_slot_epoll *ereg[EVENT_EPOLL_TABLES];
+    int slots_used[EVENT_EPOLL_TABLES];
+
+    struct list_head poller_death;
+    int poller_death_sliced; /* track whether the list of fds interested
+                              * poller_death is sliced. If yes, new thread death
+                              * notification has to wait till the list is added
+                              * back
+                              */
+    int poller_gen;
+    int used;
+    int changed;
+
+    pthread_mutex_t mutex;
+    pthread_cond_t cond;
+
+    void *evcache;
+    int evcache_size;
+
+    /* NOTE: Currently used only when event processing is done using
+     * epoll. */
+    int eventthreadcount; /* number of event threads to execute. */
+    pthread_t pollers[EVENT_MAX_THREADS]; /* poller thread_id store, and live
+                                             status */
+    int destroy;
+    int activethreadcount;
+
+    /*
+     * Number of threads created by auto-scaling, *in addition to* the
+     * configured number of threads.  This is only applicable on the
+     * server, where we try to keep the number of threads around the number
+     * of bricks.  In that case, the configured number is just "extra"
+     * threads to handle requests in excess of one per brick (including
+     * requests on the GlusterD connection).  For clients or GlusterD, this
+     * number will always be zero, so the "extra" is all we have.
+     *
+     * TBD: consider auto-scaling for clients as well
+     */
+    int auto_thread_count;
+};
+
+struct event_destroy_data {
+    int readfd;
+    struct event_pool *pool;
+};
+
+struct event_ops {
+    struct event_pool *(*new)(int count, int eventthreadcount);
+
+    int (*event_register)(struct event_pool *event_pool, int fd,
+                          event_handler_t handler, void *data, int poll_in,
+                          int poll_out, char notify_poller_death);
+
+    int (*event_select_on)(struct event_pool *event_pool, int fd, int idx,
+                           int poll_in, int poll_out);
+
+    int (*event_unregister)(struct event_pool *event_pool, int fd, int idx);
+
+    int (*event_unregister_close)(struct event_pool *event_pool, int fd,
+                                  int idx);
+
+    int (*event_dispatch)(struct event_pool *event_pool);
+
+    int (*event_reconfigure_threads)(struct event_pool *event_pool,
+                                     int newcount);
+    int (*event_pool_destroy)(struct event_pool *event_pool);
+    int (*event_handled)(struct event_pool *event_pool, int fd, int idx,
+                         int gen);
+};
+
+struct event_pool *
+event_pool_new(int count, int eventthreadcount);
+int
+event_select_on(struct event_pool *event_pool, int fd, int idx, int poll_in,
+                int poll_out);
+int
+event_register(struct event_pool *event_pool, int fd, event_handler_t handler,
+               void *data, int poll_in, int poll_out, char notify_poller_death);
+int
+event_unregister(struct event_pool *event_pool, int fd, int idx);
+int
+event_unregister_close(struct event_pool *event_pool, int fd, int idx);
+int
+event_dispatch(struct event_pool *event_pool);
+int
+event_reconfigure_threads(struct event_pool *event_pool, int value);
+int
+event_pool_destroy(struct event_pool *event_pool);
+int
+event_dispatch_destroy(struct event_pool *event_pool);
+int
+event_handled(struct event_pool *event_pool, int fd, int idx, int gen);
+
+#endif /* _GF_EVENT_H_ */