2 * Copyright (c) 2015-2019 François Tigeot <ftigeot@wolfpond.org>
3 * Copyright (c) 2019 Matthew Dillon <dillon@backplane.com>
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice unmodified, this list of conditions, and the following
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 #ifndef _LINUX_SCHED_H_
29 #define _LINUX_SCHED_H_
31 #include <linux/capability.h>
32 #include <linux/threads.h>
33 #include <linux/kernel.h>
34 #include <linux/types.h>
35 #include <linux/jiffies.h>
36 #include <linux/rbtree.h>
37 #include <linux/cpumask.h>
38 #include <linux/errno.h>
39 #include <linux/mm_types.h>
40 #include <linux/preempt.h>
44 #include <linux/compiler.h>
45 #include <linux/completion.h>
46 #include <linux/pid.h>
47 #include <linux/rcupdate.h>
48 #include <linux/rculist.h>
50 #include <linux/time.h>
51 #include <linux/timer.h>
52 #include <linux/hrtimer.h>
53 #include <linux/gfp.h>
55 #include <asm/processor.h>
57 #include <linux/spinlock.h>
59 #include <sys/param.h>
60 #include <sys/systm.h>
62 #include <sys/sched.h>
63 #include <sys/signal2.h>
65 #define TASK_RUNNING 0
66 #define TASK_INTERRUPTIBLE 1
67 #define TASK_UNINTERRUPTIBLE 2
69 #define TASK_NORMAL (TASK_INTERRUPTIBLE | TASK_UNINTERRUPTIBLE)
71 #define MAX_SCHEDULE_TIMEOUT LONG_MAX
74 * schedule_timeout: puts the current thread to sleep until timeout
75 * if its state allows it to.
78 schedule_timeout(signed long timeout)
80 unsigned long time_before, time_after;
85 kprintf("schedule_timeout(): timeout cannot be negative\n");
90 * Indefinite wait if timeout is MAX_SCHEDULE_TIMEOUT, but we are
91 * also translating to an integer. The first conditional will
92 * cover both but to code defensively test both.
94 if (timeout >= INT_MAX || timeout == MAX_SCHEDULE_TIMEOUT)
99 switch (current->state) {
100 case TASK_INTERRUPTIBLE:
102 tsleep(current, PCATCH, "lstim", timo);
104 slept = time_after - time_before;
105 ret = timeout - slept;
109 case TASK_UNINTERRUPTIBLE:
110 tsleep(current, 0, "lstim", timo);
113 /* We are supposed to return immediately here */
114 tsleep(current, 0, "lstim", 1);
119 if (timeout == MAX_SCHEDULE_TIMEOUT)
120 ret = MAX_SCHEDULE_TIMEOUT;
122 current->state = TASK_RUNNING;
127 io_schedule_timeout(signed long timeout)
129 return schedule_timeout(timeout);
132 #define TASK_COMM_LEN MAXCOMLEN
135 * local_clock: fast time source, monotonic on the same cpu
137 static inline uint64_t
143 return (ts.tv_sec * NSEC_PER_SEC) + ts.tv_nsec;
152 #define __set_current_state(state_value) current->state = (state_value);
154 #define set_current_state(state_value) \
156 __set_current_state(state_value); \
161 wake_up_process(struct task_struct *tsk)
163 /* Among other things, this function is supposed to act as
168 return 1; /* Always indicate the process was woken up */
172 signal_pending(struct task_struct *p)
174 struct thread *t = container_of(p, struct thread, td_linux_task);
176 /* Some kernel threads do not have lwp, t->td_lwp can be NULL */
177 if (t->td_lwp == NULL)
180 return CURSIG(t->td_lwp);
184 fatal_signal_pending(struct task_struct *p)
186 struct thread *t = container_of(p, struct thread, td_linux_task);
187 sigset_t pending_set;
189 /* Some kernel threads do not have lwp, t->td_lwp can be NULL */
190 if (t->td_lwp == NULL)
193 pending_set = lwp_sigpend(t->td_lwp);
194 return SIGISMEMBER(pending_set, SIGKILL);
198 signal_pending_state(long state, struct task_struct *p)
200 if (state & TASK_INTERRUPTIBLE)
201 return (signal_pending(p));
203 return (fatal_signal_pending(p));
206 /* Explicit rescheduling in order to reduce latency */
215 send_sig(int sig, struct proc *p, int priv)
222 set_need_resched(void)
224 /* do nothing for now */
225 /* used on ttm_bo_reserve failures */
228 #endif /* _LINUX_SCHED_H_ */