1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2005 David Xu <davidxu@freebsd.org> 5 * Copyright (C) 2003 Daniel M. Eischen <deischen@freebsd.org> 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 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/types.h> 34 #include <sys/signalvar.h> 35 #include <sys/rtprio.h> 36 #include <sys/mman.h> 37 #include <pthread.h> 38 39 #include "thr_private.h" 40 41 /*#define DEBUG_THREAD_KERN */ 42 #ifdef DEBUG_THREAD_KERN 43 #define DBG_MSG stdout_debug 44 #else 45 #define DBG_MSG(x...) 46 #endif 47 48 static struct umutex addr_lock; 49 static struct wake_addr *wake_addr_head; 50 static struct wake_addr default_wake_addr; 51 52 /* 53 * This is called when the first thread (other than the initial 54 * thread) is created. 55 */ 56 int 57 _thr_setthreaded(int threaded) 58 { 59 if (((threaded == 0) ^ (__isthreaded == 0)) == 0) 60 return (0); 61 62 __isthreaded = threaded; 63 return (0); 64 } 65 66 void 67 _thr_assert_lock_level(void) 68 { 69 PANIC("locklevel <= 0"); 70 } 71 72 int 73 _rtp_to_schedparam(const struct rtprio *rtp, int *policy, 74 struct sched_param *param) 75 { 76 switch(rtp->type) { 77 case RTP_PRIO_REALTIME: 78 *policy = SCHED_RR; 79 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 80 break; 81 case RTP_PRIO_FIFO: 82 *policy = SCHED_FIFO; 83 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 84 break; 85 default: 86 *policy = SCHED_OTHER; 87 param->sched_priority = 0; 88 break; 89 } 90 return (0); 91 } 92 93 int 94 _schedparam_to_rtp(int policy, const struct sched_param *param, 95 struct rtprio *rtp) 96 { 97 switch(policy) { 98 case SCHED_RR: 99 rtp->type = RTP_PRIO_REALTIME; 100 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 101 break; 102 case SCHED_FIFO: 103 rtp->type = RTP_PRIO_FIFO; 104 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 105 break; 106 case SCHED_OTHER: 107 default: 108 rtp->type = RTP_PRIO_NORMAL; 109 rtp->prio = 0; 110 break; 111 } 112 return (0); 113 } 114 115 int 116 _thr_getscheduler(lwpid_t lwpid, int *policy, struct sched_param *param) 117 { 118 struct rtprio rtp; 119 int ret; 120 121 ret = rtprio_thread(RTP_LOOKUP, lwpid, &rtp); 122 if (ret == -1) 123 return (ret); 124 _rtp_to_schedparam(&rtp, policy, param); 125 return (0); 126 } 127 128 int 129 _thr_setscheduler(lwpid_t lwpid, int policy, const struct sched_param *param) 130 { 131 struct rtprio rtp; 132 133 _schedparam_to_rtp(policy, param, &rtp); 134 return (rtprio_thread(RTP_SET, lwpid, &rtp)); 135 } 136 137 void 138 _thr_wake_addr_init(void) 139 { 140 _thr_umutex_init(&addr_lock); 141 wake_addr_head = NULL; 142 } 143 144 /* 145 * Allocate wake-address, the memory area is never freed after 146 * allocated, this becauses threads may be referencing it. 147 */ 148 struct wake_addr * 149 _thr_alloc_wake_addr(void) 150 { 151 struct pthread *curthread; 152 struct wake_addr *p; 153 154 if (_thr_initial == NULL) { 155 return &default_wake_addr; 156 } 157 158 curthread = _get_curthread(); 159 160 THR_LOCK_ACQUIRE(curthread, &addr_lock); 161 if (wake_addr_head == NULL) { 162 unsigned i; 163 unsigned pagesize = getpagesize(); 164 struct wake_addr *pp = (struct wake_addr *) 165 mmap(NULL, getpagesize(), PROT_READ|PROT_WRITE, 166 MAP_ANON|MAP_PRIVATE, -1, 0); 167 for (i = 1; i < pagesize/sizeof(struct wake_addr); ++i) 168 pp[i].link = &pp[i+1]; 169 pp[i-1].link = NULL; 170 wake_addr_head = &pp[1]; 171 p = &pp[0]; 172 } else { 173 p = wake_addr_head; 174 wake_addr_head = p->link; 175 } 176 THR_LOCK_RELEASE(curthread, &addr_lock); 177 p->value = 0; 178 return (p); 179 } 180 181 void 182 _thr_release_wake_addr(struct wake_addr *wa) 183 { 184 struct pthread *curthread = _get_curthread(); 185 186 if (wa == &default_wake_addr) 187 return; 188 THR_LOCK_ACQUIRE(curthread, &addr_lock); 189 wa->link = wake_addr_head; 190 wake_addr_head = wa; 191 THR_LOCK_RELEASE(curthread, &addr_lock); 192 } 193 194 /* Sleep on thread wakeup address */ 195 int 196 _thr_sleep(struct pthread *curthread, int clockid, 197 const struct timespec *abstime) 198 { 199 200 if (curthread->wake_addr->value != 0) 201 return (0); 202 203 return _thr_umtx_timedwait_uint(&curthread->wake_addr->value, 0, 204 clockid, abstime, 0); 205 } 206 207 void 208 _thr_wake_all(unsigned int *waddrs[], int count) 209 { 210 int i; 211 212 for (i = 0; i < count; ++i) 213 *waddrs[i] = 1; 214 _umtx_op(waddrs, UMTX_OP_NWAKE_PRIVATE, count, NULL, NULL); 215 } 216