Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1#ifndef _LINUX_SCHED_TASK_H
2#define _LINUX_SCHED_TASK_H
3
4/*
5 * Interface between the scheduler and various task lifetime (fork()/exit())
6 * functionality:
7 */
8
9#include <linux/sched.h>
10
11struct task_struct;
12union thread_union;
13
14/*
15 * This serializes "schedule()" and also protects
16 * the run-queue from deletions/modifications (but
17 * _adding_ to the beginning of the run-queue has
18 * a separate lock).
19 */
20extern rwlock_t tasklist_lock;
21extern spinlock_t mmlist_lock;
22
23extern union thread_union init_thread_union;
24extern struct task_struct init_task;
25
26#ifdef CONFIG_PROVE_RCU
27extern int lockdep_tasklist_lock_is_held(void);
28#endif /* #ifdef CONFIG_PROVE_RCU */
29
30extern asmlinkage void schedule_tail(struct task_struct *prev);
31extern void init_idle(struct task_struct *idle, int cpu);
32extern void init_idle_bootup_task(struct task_struct *idle);
33
34extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
35extern void sched_dead(struct task_struct *p);
36
37void __noreturn do_task_dead(void);
38
39extern void proc_caches_init(void);
40
41extern void release_task(struct task_struct * p);
42
43#ifdef CONFIG_HAVE_COPY_THREAD_TLS
44extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
45 struct task_struct *, unsigned long);
46#else
47extern int copy_thread(unsigned long, unsigned long, unsigned long,
48 struct task_struct *);
49
50/* Architectures that haven't opted into copy_thread_tls get the tls argument
51 * via pt_regs, so ignore the tls argument passed via C. */
52static inline int copy_thread_tls(
53 unsigned long clone_flags, unsigned long sp, unsigned long arg,
54 struct task_struct *p, unsigned long tls)
55{
56 return copy_thread(clone_flags, sp, arg, p);
57}
58#endif
59extern void flush_thread(void);
60
61#ifdef CONFIG_HAVE_EXIT_THREAD
62extern void exit_thread(struct task_struct *tsk);
63#else
64static inline void exit_thread(struct task_struct *tsk)
65{
66}
67#endif
68extern void do_group_exit(int);
69
70extern void exit_files(struct task_struct *);
71extern void exit_itimers(struct signal_struct *);
72
73extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
74extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
75struct task_struct *fork_idle(int);
76extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
77
78extern void free_task(struct task_struct *tsk);
79
80/* sched_exec is called by processes performing an exec */
81#ifdef CONFIG_SMP
82extern void sched_exec(void);
83#else
84#define sched_exec() {}
85#endif
86
87#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
88
89extern void __put_task_struct(struct task_struct *t);
90
91static inline void put_task_struct(struct task_struct *t)
92{
93 if (atomic_dec_and_test(&t->usage))
94 __put_task_struct(t);
95}
96
97struct task_struct *task_rcu_dereference(struct task_struct **ptask);
98struct task_struct *try_get_task_struct(struct task_struct **ptask);
99
100
101#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
102extern int arch_task_struct_size __read_mostly;
103#else
104# define arch_task_struct_size (sizeof(struct task_struct))
105#endif
106
107#ifdef CONFIG_VMAP_STACK
108static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
109{
110 return t->stack_vm_area;
111}
112#else
113static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
114{
115 return NULL;
116}
117#endif
118
119/*
120 * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
121 * subscriptions and synchronises with wait4(). Also used in procfs. Also
122 * pins the final release of task.io_context. Also protects ->cpuset and
123 * ->cgroup.subsys[]. And ->vfork_done.
124 *
125 * Nests both inside and outside of read_lock(&tasklist_lock).
126 * It must not be nested with write_lock_irq(&tasklist_lock),
127 * neither inside nor outside.
128 */
129static inline void task_lock(struct task_struct *p)
130{
131 spin_lock(&p->alloc_lock);
132}
133
134static inline void task_unlock(struct task_struct *p)
135{
136 spin_unlock(&p->alloc_lock);
137}
138
139#endif /* _LINUX_SCHED_TASK_H */