1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause 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/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 void 54 _thr_setthreaded(int threaded) 55 { 56 __isthreaded = threaded; 57 } 58 59 void 60 _thr_assert_lock_level(void) 61 { 62 PANIC("locklevel <= 0"); 63 } 64 65 int 66 _rtp_to_schedparam(const struct rtprio *rtp, int *policy, 67 struct sched_param *param) 68 { 69 switch(rtp->type) { 70 case RTP_PRIO_REALTIME: 71 *policy = SCHED_RR; 72 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 73 break; 74 case RTP_PRIO_FIFO: 75 *policy = SCHED_FIFO; 76 param->sched_priority = RTP_PRIO_MAX - rtp->prio; 77 break; 78 default: 79 *policy = SCHED_OTHER; 80 param->sched_priority = 0; 81 break; 82 } 83 return (0); 84 } 85 86 int 87 _schedparam_to_rtp(int policy, const struct sched_param *param, 88 struct rtprio *rtp) 89 { 90 switch(policy) { 91 case SCHED_RR: 92 rtp->type = RTP_PRIO_REALTIME; 93 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 94 break; 95 case SCHED_FIFO: 96 rtp->type = RTP_PRIO_FIFO; 97 rtp->prio = RTP_PRIO_MAX - param->sched_priority; 98 break; 99 case SCHED_OTHER: 100 default: 101 rtp->type = RTP_PRIO_NORMAL; 102 rtp->prio = 0; 103 break; 104 } 105 return (0); 106 } 107 108 int 109 _thr_getscheduler(lwpid_t lwpid, int *policy, struct sched_param *param) 110 { 111 struct rtprio rtp; 112 int ret; 113 114 ret = rtprio_thread(RTP_LOOKUP, lwpid, &rtp); 115 if (ret == -1) 116 return (ret); 117 _rtp_to_schedparam(&rtp, policy, param); 118 return (0); 119 } 120 121 int 122 _thr_setscheduler(lwpid_t lwpid, int policy, const struct sched_param *param) 123 { 124 struct rtprio rtp; 125 126 _schedparam_to_rtp(policy, param, &rtp); 127 return (rtprio_thread(RTP_SET, lwpid, &rtp)); 128 } 129 130 void 131 _thr_wake_addr_init(void) 132 { 133 _thr_umutex_init(&addr_lock); 134 wake_addr_head = NULL; 135 } 136 137 /* 138 * Allocate wake-address, the memory area is never freed after 139 * allocated, this becauses threads may be referencing it. 140 */ 141 struct wake_addr * 142 _thr_alloc_wake_addr(void) 143 { 144 struct pthread *curthread; 145 struct wake_addr *p; 146 147 if (_thr_initial == NULL) { 148 return &default_wake_addr; 149 } 150 151 curthread = _get_curthread(); 152 153 THR_LOCK_ACQUIRE(curthread, &addr_lock); 154 if (wake_addr_head == NULL) { 155 unsigned i; 156 unsigned pagesize = getpagesize(); 157 struct wake_addr *pp = (struct wake_addr *) 158 mmap(NULL, pagesize, PROT_READ|PROT_WRITE, 159 MAP_ANON|MAP_PRIVATE, -1, 0); 160 for (i = 1; i < pagesize/sizeof(struct wake_addr); ++i) 161 pp[i].link = &pp[i+1]; 162 pp[i-1].link = NULL; 163 wake_addr_head = &pp[1]; 164 p = &pp[0]; 165 } else { 166 p = wake_addr_head; 167 wake_addr_head = p->link; 168 } 169 THR_LOCK_RELEASE(curthread, &addr_lock); 170 p->value = 0; 171 return (p); 172 } 173 174 void 175 _thr_release_wake_addr(struct wake_addr *wa) 176 { 177 struct pthread *curthread = _get_curthread(); 178 179 if (wa == &default_wake_addr) 180 return; 181 THR_LOCK_ACQUIRE(curthread, &addr_lock); 182 wa->link = wake_addr_head; 183 wake_addr_head = wa; 184 THR_LOCK_RELEASE(curthread, &addr_lock); 185 } 186 187 /* Sleep on thread wakeup address */ 188 int 189 _thr_sleep(struct pthread *curthread, int clockid, 190 const struct timespec *abstime) 191 { 192 193 if (curthread->wake_addr->value != 0) 194 return (0); 195 196 return _thr_umtx_timedwait_uint(&curthread->wake_addr->value, 0, 197 clockid, abstime, 0); 198 } 199 200 void 201 _thr_wake_all(unsigned int *waddrs[], int count) 202 { 203 int i; 204 205 for (i = 0; i < count; ++i) 206 *waddrs[i] = 1; 207 _umtx_op(waddrs, UMTX_OP_NWAKE_PRIVATE, count, NULL, NULL); 208 } 209