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
48static struct umutex	addr_lock;
49static struct wake_addr *wake_addr_head;
50static 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 */
56void
57_thr_setthreaded(int threaded)
58{
59	__isthreaded = threaded;
60}
61
62void
63_thr_assert_lock_level(void)
64{
65	PANIC("locklevel <= 0");
66}
67
68int
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
89int
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
111int
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
124int
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
133void
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 */
144struct 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, 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
177void
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 */
191int
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
203void
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