1 /***************************************************************************** 2 3 Copyright (c) 2006, 2018, Oracle and/or its affiliates. All Rights Reserved. 4 5 This program is free software; you can redistribute it and/or modify it under 6 the terms of the GNU General Public License, version 2.0, as published by the 7 Free Software Foundation. 8 9 This program is also distributed with certain software (including but not 10 limited to OpenSSL) that is licensed under separate terms, as designated in a 11 particular file or component or in included license documentation. The authors 12 of MySQL hereby grant you an additional permission to link the program and 13 your derivative works with the separately licensed software that they have 14 included with MySQL. 15 16 This program is distributed in the hope that it will be useful, but WITHOUT 17 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 18 FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0, 19 for more details. 20 21 You should have received a copy of the GNU General Public License along with 22 this program; if not, write to the Free Software Foundation, Inc., 23 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 24 25 *****************************************************************************/ 26 27 /** @file include/ut0wqueue.h 28 A work queue 29 30 Created 4/26/2006 Osku Salerma 31 ************************************************************************/ 32 33 /** A Work queue. Threads can add work items to the queue and other threads can 34 wait for work items to be available and take them off the queue for 35 processing. 36 ************************************************************************/ 37 38 #ifndef IB_WORK_QUEUE_H 39 #define IB_WORK_QUEUE_H 40 41 #include "mem0mem.h" 42 #include "sync0sync.h" 43 #include "ut0list.h" 44 45 // Forward declaration 46 struct ib_list_t; 47 struct ib_wqueue_t; 48 49 /** Create a new work queue. 50 @return work queue */ 51 ib_wqueue_t *ib_wqueue_create(); 52 53 /** Free a work queue. */ 54 void ib_wqueue_free(ib_wqueue_t *wq); /*!< in: work queue */ 55 56 /** Add a work item to the queue. */ 57 void ib_wqueue_add(ib_wqueue_t *wq, /*!< in: work queue */ 58 void *item, /*!< in: work item */ 59 mem_heap_t *heap); /*!< in: memory heap to use for 60 allocating the list node */ 61 62 /******************************************************************** 63 Check if queue is empty. */ 64 ibool ib_wqueue_is_empty( 65 /* out: TRUE if queue empty 66 else FALSE */ 67 const ib_wqueue_t *wq); /* in: work queue */ 68 69 /******************************************************************** 70 Wait for a work item to appear in the queue for specified time. */ 71 void *ib_wqueue_timedwait( 72 /* out: work item or NULL on timeout*/ 73 ib_wqueue_t *wq, /* in: work queue */ 74 ib_time_t wait_in_usecs); /* in: wait time in micro seconds */ 75 76 #endif /* IB_WORK_QUEUE_H */ 77