1 /* -*- mode: c; c-basic-offset: 8; -*- 2 * vim: noexpandtab sw=8 ts=8 sts=0: 3 * 4 * heartbeat.h 5 * 6 * Function prototypes 7 * 8 * Copyright (C) 2004 Oracle. All rights reserved. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public 12 * License as published by the Free Software Foundation; either 13 * version 2 of the License, or (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 18 * General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public 21 * License along with this program; if not, write to the 22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 23 * Boston, MA 021110-1307, USA. 24 * 25 */ 26 27 #ifndef R2CLUSTER_HEARTBEAT_H 28 #define R2CLUSTER_HEARTBEAT_H 29 30 #define R2HB_REGION_TIMEOUT_MS 2000 31 32 #define R2HB_MAX_REGION_NAME_LEN 32 33 34 /* number of changes to be seen as live */ 35 #define R2HB_LIVE_THRESHOLD 2 36 /* number of equal samples to be seen as dead */ 37 extern unsigned int r2hb_dead_threshold; 38 #define R2HB_DEFAULT_DEAD_THRESHOLD 31 39 /* Otherwise MAX_WRITE_TIMEOUT will be zero... */ 40 #define R2HB_MIN_DEAD_THRESHOLD 2 41 #define R2HB_MAX_WRITE_TIMEOUT_MS \ 42 (R2HB_REGION_TIMEOUT_MS * (r2hb_dead_threshold - 1)) 43 44 #define R2HB_CB_MAGIC 0x51d1e4ec 45 46 /* callback stuff */ 47 enum r2hb_callback_type { 48 R2HB_NODE_DOWN_CB = 0, 49 R2HB_NODE_UP_CB, 50 R2HB_NUM_CB 51 }; 52 53 struct r2nm_node; 54 typedef void (r2hb_cb_func)(struct r2nm_node *, int, void *); 55 56 struct r2hb_callback_func { 57 u32 hc_magic; 58 struct list_head hc_item; 59 r2hb_cb_func *hc_func; 60 void *hc_data; 61 int hc_priority; 62 enum r2hb_callback_type hc_type; 63 }; 64 65 struct config_group *r2hb_alloc_hb_set(void); 66 void r2hb_free_hb_set(struct config_group *group); 67 68 void r2hb_setup_callback(struct r2hb_callback_func *hc, 69 enum r2hb_callback_type type, 70 r2hb_cb_func *func, 71 void *data, 72 int priority); 73 int r2hb_register_callback(const char *region_uuid, 74 struct r2hb_callback_func *hc); 75 void r2hb_unregister_callback(const char *region_uuid, 76 struct r2hb_callback_func *hc); 77 void r2hb_fill_node_map(unsigned long *map, 78 unsigned bytes); 79 void r2hb_exit(void); 80 int r2hb_init(void); 81 int r2hb_check_node_heartbeating_from_callback(u8 node_num); 82 void r2hb_stop_all_regions(void); 83 int r2hb_get_all_regions(char *region_uuids, u8 numregions); 84 int r2hb_global_heartbeat_active(void); 85 void r2hb_manual_set_node_heartbeating(int); 86 87 #endif /* R2CLUSTER_HEARTBEAT_H */ 88