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 void 57 _thr_setthreaded(int threaded) 58 { 59 __isthreaded = threaded; 60 } 61 62 void 63 _thr_assert_lock_level(void) 64 { 65 PANIC("locklevel <= 0"); 66 } 67 68 int 69 _rtp_to_schedparam(const struct rtprio *rtp, int *policy, 70 struct sched_param *param) 71 { 72 switch(rtp->type) { 73 case RTP_PRIO_REALTIME: 74 *policy = SCHED_RR; 75 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 76 break; 77 case RTP_PRIO_FIFO: 78 *policy = SCHED_FIFO; 79 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 80 break; 81 default: 82 *policy = SCHED_OTHER; 83 param->sched_priority = 0; 84 break; 85 } 86 return (0); 87 } 88 89 int 90 _schedparam_to_rtp(int policy, const struct sched_param *param, 91 struct rtprio *rtp) 92 { 93 switch(policy) { 94 case SCHED_RR: 95 rtp->type = RTP_PRIO_REALTIME; 96 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 97 break; 98 case SCHED_FIFO: 99 rtp->type = RTP_PRIO_FIFO; 100 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 101 break; 102 case SCHED_OTHER: 103 default: 104 rtp->type = RTP_PRIO_NORMAL; 105 rtp->prio = 0; 106 break; 107 } 108 return (0); 109 } 110 111 int 112 _thr_getscheduler(lwpid_t lwpid, int *policy, struct sched_param *param) 113 { 114 struct rtprio rtp; 115 int ret; 116 117 ret = rtprio_thread(RTP_LOOKUP, lwpid, &rtp); 118 if (ret == -1) 119 return (ret); 120 _rtp_to_schedparam(&rtp, policy, param); 121 return (0); 122 } 123 124 int 125 _thr_setscheduler(lwpid_t lwpid, int policy, const struct sched_param *param) 126 { 127 struct rtprio rtp; 128 129 _schedparam_to_rtp(policy, param, &rtp); 130 return (rtprio_thread(RTP_SET, lwpid, &rtp)); 131 } 132 133 void 134 _thr_wake_addr_init(void) 135 { 136 _thr_umutex_init(&addr_lock); 137 wake_addr_head = NULL; 138 } 139 140 /* 141 * Allocate wake-address, the memory area is never freed after 142 * allocated, this becauses threads may be referencing it. 143 */ 144 struct wake_addr * 145 _thr_alloc_wake_addr(void) 146 { 147 struct pthread *curthread; 148 struct wake_addr *p; 149 150 if (_thr_initial == NULL) { 151 return &default_wake_addr; 152 } 153 154 curthread = _get_curthread(); 155 156 THR_LOCK_ACQUIRE(curthread, &addr_lock); 157 if (wake_addr_head == NULL) { 158 unsigned i; 159 unsigned pagesize = getpagesize(); 160 struct wake_addr *pp = (struct wake_addr *) 161 mmap(NULL, pagesize, PROT_READ|PROT_WRITE, 162 MAP_ANON|MAP_PRIVATE, -1, 0); 163 for (i = 1; i < pagesize/sizeof(struct wake_addr); ++i) 164 pp[i].link = &pp[i+1]; 165 pp[i-1].link = NULL; 166 wake_addr_head = &pp[1]; 167 p = &pp[0]; 168 } else { 169 p = wake_addr_head; 170 wake_addr_head = p->link; 171 } 172 THR_LOCK_RELEASE(curthread, &addr_lock); 173 p->value = 0; 174 return (p); 175 } 176 177 void 178 _thr_release_wake_addr(struct wake_addr *wa) 179 { 180 struct pthread *curthread = _get_curthread(); 181 182 if (wa == &default_wake_addr) 183 return; 184 THR_LOCK_ACQUIRE(curthread, &addr_lock); 185 wa->link = wake_addr_head; 186 wake_addr_head = wa; 187 THR_LOCK_RELEASE(curthread, &addr_lock); 188 } 189 190 /* Sleep on thread wakeup address */ 191 int 192 _thr_sleep(struct pthread *curthread, int clockid, 193 const struct timespec *abstime) 194 { 195 196 if (curthread->wake_addr->value != 0) 197 return (0); 198 199 return _thr_umtx_timedwait_uint(&curthread->wake_addr->value, 0, 200 clockid, abstime, 0); 201 } 202 203 void 204 _thr_wake_all(unsigned int *waddrs[], int count) 205 { 206 int i; 207 208 for (i = 0; i < count; ++i) 209 *waddrs[i] = 1; 210 _umtx_op(waddrs, UMTX_OP_NWAKE_PRIVATE, count, NULL, NULL); 211 } 212