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