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/list.h> 36 #include <linux/jiffies.h> 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/sleepqueue.h> 41 #include <sys/kernel.h> 42 #include <sys/proc.h> 43 44 typedef struct { 45 } wait_queue_t; 46 47 typedef struct { 48 unsigned int wchan; 49 } wait_queue_head_t; 50 51 #define init_waitqueue_head(x) \ 52 do { } while (0) 53 54 static inline void 55 __wake_up(wait_queue_head_t *q, int all) 56 { 57 int wakeup_swapper; 58 void *c; 59 60 c = &q->wchan; 61 sleepq_lock(c); 62 if (all) 63 wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0); 64 else 65 wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); 66 sleepq_release(c); 67 if (wakeup_swapper) 68 kick_proc0(); 69 } 70 71 #define wake_up(q) __wake_up(q, 0) 72 #define wake_up_nr(q, nr) __wake_up(q, 1) 73 #define wake_up_all(q) __wake_up(q, 1) 74 #define wake_up_interruptible(q) __wake_up(q, 0) 75 #define wake_up_interruptible_nr(q, nr) __wake_up(q, 1) 76 #define wake_up_interruptible_all(q, nr) __wake_up(q, 1) 77 78 #define wait_event(q, cond) \ 79 do { \ 80 void *c = &(q).wchan; \ 81 if (!(cond)) { \ 82 for (;;) { \ 83 if (SCHEDULER_STOPPED()) \ 84 break; \ 85 sleepq_lock(c); \ 86 if (cond) { \ 87 sleepq_release(c); \ 88 break; \ 89 } \ 90 sleepq_add(c, NULL, "completion", SLEEPQ_SLEEP, 0); \ 91 sleepq_wait(c, 0); \ 92 } \ 93 } \ 94 } while (0) 95 96 #define wait_event_interruptible(q, cond) \ 97 ({ \ 98 void *c = &(q).wchan; \ 99 int _error; \ 100 \ 101 _error = 0; \ 102 if (!(cond)) { \ 103 for (; _error == 0;) { \ 104 if (SCHEDULER_STOPPED()) \ 105 break; \ 106 sleepq_lock(c); \ 107 if (cond) { \ 108 sleepq_release(c); \ 109 break; \ 110 } \ 111 sleepq_add(c, NULL, "completion", \ 112 SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0); \ 113 if (sleepq_wait_sig(c, 0)) \ 114 _error = -ERESTARTSYS; \ 115 } \ 116 } \ 117 -_error; \ 118 }) 119 120 #define wait_event_interruptible_timeout(q, cond, timeout) \ 121 ({ \ 122 void *c = &(q).wchan; \ 123 long end = jiffies + timeout; \ 124 int __ret = 0; \ 125 int __rc = 0; \ 126 \ 127 if (!(cond)) { \ 128 for (; __rc == 0;) { \ 129 if (SCHEDULER_STOPPED()) \ 130 break; \ 131 sleepq_lock(c); \ 132 if (cond) { \ 133 sleepq_release(c); \ 134 __ret = 1; \ 135 break; \ 136 } \ 137 sleepq_add(c, NULL, "completion", \ 138 SLEEPQ_SLEEP | SLEEPQ_INTERRUPTIBLE, 0); \ 139 sleepq_set_timeout(c, linux_timer_jiffies_until(end));\ 140 __rc = sleepq_timedwait_sig (c, 0); \ 141 if (__rc != 0) { \ 142 /* check for timeout or signal. \ 143 * 0 if the condition evaluated to false\ 144 * after the timeout elapsed, 1 if the \ 145 * condition evaluated to true after the\ 146 * timeout elapsed. \ 147 */ \ 148 if (__rc == EWOULDBLOCK) \ 149 __ret = (cond); \ 150 else \ 151 __ret = -ERESTARTSYS; \ 152 } \ 153 \ 154 } \ 155 } else { \ 156 /* return remaining jiffies (at least 1) if the \ 157 * condition evaluated to true before the timeout \ 158 * elapsed. \ 159 */ \ 160 __ret = (end - jiffies); \ 161 if( __ret < 1 ) \ 162 __ret = 1; \ 163 } \ 164 __ret; \ 165 }) 166 167 168 static inline int 169 waitqueue_active(wait_queue_head_t *q) 170 { 171 return 0; /* XXX: not really implemented */ 172 } 173 174 #define DEFINE_WAIT(name) \ 175 wait_queue_t name = {} 176 177 static inline void 178 prepare_to_wait(wait_queue_head_t *q, wait_queue_t *wait, int state) 179 { 180 } 181 182 static inline void 183 finish_wait(wait_queue_head_t *q, wait_queue_t *wait) 184 { 185 } 186 187 #endif /* _LINUX_WAIT_H_ */ 188