1 /* 2 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 3 * Copyright (C) 2003 Daniel M. Eischen <deischen@freebsd.org> 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice unmodified, this list of conditions, and the following 11 * disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 * $FreeBSD$ 28 */ 29 30 #include <sys/types.h> 31 #include <sys/signalvar.h> 32 #include <sys/rtprio.h> 33 #include <sys/mman.h> 34 #include <pthread.h> 35 36 #include "thr_private.h" 37 38 /*#define DEBUG_THREAD_KERN */ 39 #ifdef DEBUG_THREAD_KERN 40 #define DBG_MSG stdout_debug 41 #else 42 #define DBG_MSG(x...) 43 #endif 44 45 static struct umutex addr_lock; 46 static struct wake_addr *wake_addr_head; 47 static struct wake_addr default_wake_addr; 48 49 /* 50 * This is called when the first thread (other than the initial 51 * thread) is created. 52 */ 53 int 54 _thr_setthreaded(int threaded) 55 { 56 if (((threaded == 0) ^ (__isthreaded == 0)) == 0) 57 return (0); 58 59 __isthreaded = threaded; 60 return (0); 61 } 62 63 void 64 _thr_assert_lock_level() 65 { 66 PANIC("locklevel <= 0"); 67 } 68 69 int 70 _rtp_to_schedparam(const struct rtprio *rtp, int *policy, 71 struct sched_param *param) 72 { 73 switch(rtp->type) { 74 case RTP_PRIO_REALTIME: 75 *policy = SCHED_RR; 76 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 77 break; 78 case RTP_PRIO_FIFO: 79 *policy = SCHED_FIFO; 80 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 81 break; 82 default: 83 *policy = SCHED_OTHER; 84 param->sched_priority = 0; 85 break; 86 } 87 return (0); 88 } 89 90 int 91 _schedparam_to_rtp(int policy, const struct sched_param *param, 92 struct rtprio *rtp) 93 { 94 switch(policy) { 95 case SCHED_RR: 96 rtp->type = RTP_PRIO_REALTIME; 97 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 98 break; 99 case SCHED_FIFO: 100 rtp->type = RTP_PRIO_FIFO; 101 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 102 break; 103 case SCHED_OTHER: 104 default: 105 rtp->type = RTP_PRIO_NORMAL; 106 rtp->prio = 0; 107 break; 108 } 109 return (0); 110 } 111 112 int 113 _thr_getscheduler(lwpid_t lwpid, int *policy, struct sched_param *param) 114 { 115 struct rtprio rtp; 116 int ret; 117 118 ret = rtprio_thread(RTP_LOOKUP, lwpid, &rtp); 119 if (ret == -1) 120 return (ret); 121 _rtp_to_schedparam(&rtp, policy, param); 122 return (0); 123 } 124 125 int 126 _thr_setscheduler(lwpid_t lwpid, int policy, const struct sched_param *param) 127 { 128 struct rtprio rtp; 129 130 _schedparam_to_rtp(policy, param, &rtp); 131 return (rtprio_thread(RTP_SET, lwpid, &rtp)); 132 } 133 134 void 135 _thr_wake_addr_init(void) 136 { 137 _thr_umutex_init(&addr_lock); 138 wake_addr_head = NULL; 139 } 140 141 /* 142 * Allocate wake-address, the memory area is never freed after 143 * allocated, this becauses threads may be referencing it. 144 */ 145 struct wake_addr * 146 _thr_alloc_wake_addr(void) 147 { 148 struct pthread *curthread; 149 struct wake_addr *p; 150 151 if (_thr_initial == NULL) { 152 return &default_wake_addr; 153 } 154 155 curthread = _get_curthread(); 156 157 THR_LOCK_ACQUIRE(curthread, &addr_lock); 158 if (wake_addr_head == NULL) { 159 unsigned i; 160 unsigned pagesize = getpagesize(); 161 struct wake_addr *pp = (struct wake_addr *) 162 mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE, 163 MAP_ANON|MAP_PRIVATE, -1, 0); 164 for (i = 1; i < pagesize/sizeof(struct wake_addr); ++i) 165 pp[i].link = &pp[i+1]; 166 pp[i-1].link = NULL; 167 wake_addr_head = &pp[1]; 168 p = &pp[0]; 169 } else { 170 p = wake_addr_head; 171 wake_addr_head = p->link; 172 } 173 THR_LOCK_RELEASE(curthread, &addr_lock); 174 p->value = 0; 175 return (p); 176 } 177 178 void 179 _thr_release_wake_addr(struct wake_addr *wa) 180 { 181 struct pthread *curthread = _get_curthread(); 182 183 if (wa == &default_wake_addr) 184 return; 185 THR_LOCK_ACQUIRE(curthread, &addr_lock); 186 wa->link = wake_addr_head; 187 wake_addr_head = wa; 188 THR_LOCK_RELEASE(curthread, &addr_lock); 189 } 190 191 /* Sleep on thread wakeup address */ 192 int 193 _thr_sleep(struct pthread *curthread, int clockid, 194 const struct timespec *abstime) 195 { 196 197 if (curthread->wake_addr->value != 0) 198 return (0); 199 200 return _thr_umtx_timedwait_uint(&curthread->wake_addr->value, 0, 201 clockid, abstime, 0); 202 } 203 204 void 205 _thr_wake_all(unsigned int *waddrs[], int count) 206 { 207 int i; 208 209 for (i = 0; i < count; ++i) 210 *waddrs[i] = 1; 211 _umtx_op(waddrs, UMTX_OP_NWAKE_PRIVATE, count, NULL, NULL); 212 } 213