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
45static struct umutex	addr_lock;
46static struct wake_addr *wake_addr_head;
47static 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 */
53void
54_thr_setthreaded(int threaded)
55{
56	__isthreaded = threaded;
57}
58
59void
60_thr_assert_lock_level(void)
61{
62	PANIC("locklevel <= 0");
63}
64
65int
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
86int
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
108int
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
121int
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
130void
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 */
141struct 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
174void
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 */
188int
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
200void
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