1 /* 2 * Copyright (c) 2008, XenSource Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * * Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * * Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * * Neither the name of XenSource Inc. nor the names of its contributors 13 * may be used to endorse or promote products derived from this software 14 * without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER 20 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 21 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 22 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 #ifndef _SCHEDULER_H_ 29 #define _SCHEDULER_H_ 30 31 #include <sys/select.h> 32 33 #include "list.h" 34 35 #define SCHEDULER_POLL_READ_FD 0x1 36 #define SCHEDULER_POLL_WRITE_FD 0x2 37 #define SCHEDULER_POLL_EXCEPT_FD 0x4 38 #define SCHEDULER_POLL_TIMEOUT 0x8 39 40 typedef int event_id_t; 41 typedef void (*event_cb_t) (event_id_t id, char mode, void *private); 42 43 typedef struct scheduler { 44 fd_set read_fds; 45 fd_set write_fds; 46 fd_set except_fds; 47 48 struct list_head events; 49 50 int uuid; 51 int max_fd; 52 int timeout; 53 int restart; 54 int max_timeout; 55 } scheduler_t; 56 57 void scheduler_initialize(scheduler_t *); 58 event_id_t scheduler_register_event(scheduler_t *, char mode, 59 int fd, int timeout, 60 event_cb_t cb, void *private); 61 void scheduler_unregister_event(scheduler_t *, event_id_t); 62 void scheduler_set_max_timeout(scheduler_t *, int); 63 int scheduler_wait_for_events(scheduler_t *); 64 65 #endif 66