1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2005 David Xu <[email protected]>
5 * Copyright (C) 2003 Daniel M. Eischen <[email protected]>
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
_thr_setthreaded(int threaded)57 _thr_setthreaded(int threaded)
58 {
59 __isthreaded = threaded;
60 }
61
62 void
_thr_assert_lock_level(void)63 _thr_assert_lock_level(void)
64 {
65 PANIC("locklevel <= 0");
66 }
67
68 int
_rtp_to_schedparam(const struct rtprio * rtp,int * policy,struct sched_param * param)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
_schedparam_to_rtp(int policy,const struct sched_param * param,struct rtprio * rtp)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
_thr_getscheduler(lwpid_t lwpid,int * policy,struct sched_param * param)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
_thr_setscheduler(lwpid_t lwpid,int policy,const struct sched_param * param)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
_thr_wake_addr_init(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 *
_thr_alloc_wake_addr(void)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, getpagesize(), 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
_thr_release_wake_addr(struct wake_addr * wa)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
_thr_sleep(struct pthread * curthread,int clockid,const struct timespec * abstime)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
_thr_wake_all(unsigned int * waddrs[],int count)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