1 /*****************************************************************************\
2 * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
3 * Copyright (C) 2007 The Regents of the University of California.
4 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
5 * Written by Brian Behlendorf <behlendorf1@llnl.gov>.
8 * This file is part of the SPL, Solaris Porting Layer.
9 * For details, see <http://github.com/behlendorf/spl/>.
11 * The SPL is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
16 * The SPL is distributed in the hope that it will be useful, but WITHOUT
17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
18 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
21 * You should have received a copy of the GNU General Public License along
22 * with the SPL. If not, see <http://www.gnu.org/licenses/>.
23 \*****************************************************************************/
28 #include <linux/module.h>
29 #include <linux/gfp.h>
30 #include <linux/slab.h>
31 #include <linux/interrupt.h>
32 #include <linux/kthread.h>
33 #include <sys/types.h>
34 #include <sys/thread.h>
36 #define TASKQ_NAMELEN 31
38 #define TASKQ_PREPOPULATE 0x00000001
39 #define TASKQ_CPR_SAFE 0x00000002
40 #define TASKQ_DYNAMIC 0x00000004
41 #define TASKQ_THREADS_CPU_PCT 0x00000008
43 typedef unsigned long taskqid_t;
44 typedef void (task_func_t)(void *);
47 * Flags for taskq_dispatch. TQ_SLEEP/TQ_NOSLEEP should be same as
48 * KM_SLEEP/KM_NOSLEEP. TQ_NOQUEUE/TQ_NOALLOC are set particularly
49 * large so as not to conflict with already used GFP_* defines.
51 #define TQ_SLEEP KM_SLEEP
52 #define TQ_NOSLEEP KM_NOSLEEP
53 #define TQ_NOQUEUE 0x01000000
54 #define TQ_NOALLOC 0x02000000
55 #define TQ_NEW 0x04000000
56 #define TQ_ACTIVE 0x80000000
58 typedef struct taskq {
59 spinlock_t tq_lock; /* protects taskq_t */
60 unsigned long tq_lock_flags; /* interrupt state */
61 struct task_struct **tq_threads; /* thread pointers */
62 const char *tq_name; /* taskq name */
63 int tq_nactive; /* # of active threads */
64 int tq_nthreads; /* # of total threads */
65 int tq_pri; /* priority */
66 int tq_minalloc; /* min task_t pool size */
67 int tq_maxalloc; /* max task_t pool size */
68 int tq_nalloc; /* cur task_t pool size */
69 uint_t tq_flags; /* flags */
70 taskqid_t tq_next_id; /* next pend/work id */
71 taskqid_t tq_lowest_id; /* lowest pend/work id */
72 struct list_head tq_free_list; /* free task_t's */
73 struct list_head tq_work_list; /* work task_t's */
74 struct list_head tq_pend_list; /* pending task_t's */
75 wait_queue_head_t tq_work_waitq; /* new work waitq */
76 wait_queue_head_t tq_wait_waitq; /* wait waitq */
79 /* Global system-wide dynamic task queue available for all consumers */
80 extern taskq_t *system_taskq;
82 extern taskqid_t __taskq_dispatch(taskq_t *, task_func_t, void *, uint_t);
83 extern taskq_t *__taskq_create(const char *, int, pri_t, int, int, uint_t);
84 extern void __taskq_destroy(taskq_t *);
85 extern void __taskq_wait_id(taskq_t *, taskqid_t);
86 extern void __taskq_wait(taskq_t *);
87 extern int __taskq_member(taskq_t *, void *);
89 int spl_taskq_init(void);
90 void spl_taskq_fini(void);
92 #define taskq_member(tq, t) __taskq_member(tq, t)
93 #define taskq_wait_id(tq, id) __taskq_wait_id(tq, id)
94 #define taskq_wait(tq) __taskq_wait(tq)
95 #define taskq_dispatch(tq, f, p, fl) __taskq_dispatch(tq, f, p, fl)
96 #define taskq_create(n, th, p, mi, ma, fl) __taskq_create(n, th, p, mi, ma, fl)
97 #define taskq_destroy(tq) __taskq_destroy(tq)
99 #endif /* _SPL_TASKQ_H */