1 /*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013, 2014 Mellanox Technologies, Ltd. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice unmodified, this list of conditions, and the following 13 * disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 #ifndef _LINUX_WAIT_H_ 32 #define _LINUX_WAIT_H_ 33 34 #include <linux/compiler.h> 35 #include <linux/spinlock.h> 36 #include <linux/sched.h> 37 #include <linux/list.h> 38 #include <linux/jiffies.h> 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/sleepqueue.h> 43 #include <sys/kernel.h> 44 #include <sys/proc.h> 45 46 typedef struct { 47 } wait_queue_t; 48 49 typedef struct { 50 unsigned int wchan; 51 } wait_queue_head_t; 52 53 #define init_waitqueue_head(x) \ 54 do { } while (0) 55 56 static inline void 57 __wake_up(wait_queue_head_t *q, int all) 58 { 59 int wakeup_swapper; 60 void *c; 61 62 c = &q->wchan; 63 sleepq_lock(c); 64 if (all) 65 wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0); 66 else 67 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); 68 sleepq_release(c); 69 if (wakeup_swapper) 70 kick_proc0(); 71 } 72 73 #define wake_up(q) __wake_up(q, 0) 74 #define wake_up_nr(q, nr) __wake_up(q, 1) 75 #define wake_up_all(q) __wake_up(q, 1) 76 #define wake_up_interruptible(q) __wake_up(q, 0) 77 #define wake_up_interruptible_nr(q, nr) __wake_up(q, 1) 78 #define wake_up_interruptible_all(q, nr) __wake_up(q, 1) 79 80 #define wait_event(q, cond) \ 81 do { \ 82 void *c = &(q).wchan; \ 83 if (!(cond)) { \ 84 for (;;) { \ 85 if (SCHEDULER_STOPPED()) \ 86 break; \ 87 sleepq_lock(c); \ 88 if (cond) { \ 89 sleepq_release(c); \ 90 break; \ 91 } \ 92 sleepq_add(c, NULL, "completion", SLEEPQ_SLEEP, 0); \ 93 sleepq_wait(c, 0); \ 94 } \ 95 } \ 96 } while (0) 97 98 #define wait_event_interruptible(q, cond) \ 99 ({ \ 100 void *c = &(q).wchan; \ 101 int _error; \ 102 \ 103 _error = 0; \ 104 if (!(cond)) { \ 105 for (; _error == 0;) { \ 106 if (SCHEDULER_STOPPED()) \ 107 break; \ 108 sleepq_lock(c); \ 109 if (cond) { \ 110 sleepq_release(c); \ 111 break; \ 112 } \ 113 sleepq_add(c, NULL, "completion", \ 114 SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0); \ 115 if (sleepq_wait_sig(c, 0)) \ 116 _error = -ERESTARTSYS; \ 117 } \ 118 } \ 119 -_error; \ 120 }) 121 122 #define wait_event_interruptible_timeout(q, cond, timeout) \ 123 ({ \ 124 void *c = &(q).wchan; \ 125 long end = jiffies + timeout; \ 126 int __ret = 0; \ 127 int __rc = 0; \ 128 \ 129 if (!(cond)) { \ 130 for (; __rc == 0;) { \ 131 if (SCHEDULER_STOPPED()) \ 132 break; \ 133 sleepq_lock(c); \ 134 if (cond) { \ 135 sleepq_release(c); \ 136 __ret = 1; \ 137 break; \ 138 } \ 139 sleepq_add(c, NULL, "completion", \ 140 SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0); \ 141 sleepq_set_timeout(c, linux_timer_jiffies_until(end));\ 142 __rc = sleepq_timedwait_sig (c, 0); \ 143 if (__rc != 0) { \ 144 /* check for timeout or signal. \ 145 * 0 if the condition evaluated to false\ 146 * after the timeout elapsed, 1 if the \ 147 * condition evaluated to true after the\ 148 * timeout elapsed. \ 149 */ \ 150 if (__rc == EWOULDBLOCK) \ 151 __ret = (cond); \ 152 else \ 153 __ret = -ERESTARTSYS; \ 154 } \ 155 \ 156 } \ 157 } else { \ 158 /* return remaining jiffies (at least 1) if the \ 159 * condition evaluated to true before the timeout \ 160 * elapsed. \ 161 */ \ 162 __ret = (end - jiffies); \ 163 if( __ret < 1 ) \ 164 __ret = 1; \ 165 } \ 166 __ret; \ 167 }) 168 169 170 static inline int 171 waitqueue_active(wait_queue_head_t *q) 172 { 173 return 0; /* XXX: not really implemented */ 174 } 175 176 #define DEFINE_WAIT(name) \ 177 wait_queue_t name = {} 178 179 static inline void 180 prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state) 181 { 182 } 183 184 static inline void 185 finish_wait(wait_queue_head_t *q, wait_queue_t *wait) 186 { 187 } 188 189 #endif /* _LINUX_WAIT_H_ */ 190