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;
12struct rusage;
13union thread_union;
14
15/*
16 * This serializes "schedule()" and also protects
17 * the run-queue from deletions/modifications (but
18 * _adding_ to the beginning of the run-queue has
19 * a separate lock).
20 */
21extern rwlock_t tasklist_lock;
22extern spinlock_t mmlist_lock;
23
24extern union thread_union init_thread_union;
25extern struct task_struct init_task;
26
27#ifdef CONFIG_PROVE_RCU
28extern int lockdep_tasklist_lock_is_held(void);
29#endif /* #ifdef CONFIG_PROVE_RCU */
30
31extern asmlinkage void schedule_tail(struct task_struct *prev);
32extern void init_idle(struct task_struct *idle, int cpu);
33extern void init_idle_bootup_task(struct task_struct *idle);
34
35extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
36extern void sched_dead(struct task_struct *p);
37
38void __noreturn do_task_dead(void);
39
40extern void proc_caches_init(void);
41
42extern void release_task(struct task_struct * p);
43
44#ifdef CONFIG_HAVE_COPY_THREAD_TLS
45extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
46 struct task_struct *, unsigned long);
47#else
48extern int copy_thread(unsigned long, unsigned long, unsigned long,
49 struct task_struct *);
50
51/* Architectures that haven't opted into copy_thread_tls get the tls argument
52 * via pt_regs, so ignore the tls argument passed via C. */
53static inline int copy_thread_tls(
54 unsigned long clone_flags, unsigned long sp, unsigned long arg,
55 struct task_struct *p, unsigned long tls)
56{
57 return copy_thread(clone_flags, sp, arg, p);
58}
59#endif
60extern void flush_thread(void);
61
62#ifdef CONFIG_HAVE_EXIT_THREAD
63extern void exit_thread(struct task_struct *tsk);
64#else
65static inline void exit_thread(struct task_struct *tsk)
66{
67}
68#endif
69extern void do_group_exit(int);
70
71extern void exit_files(struct task_struct *);
72extern void exit_itimers(struct signal_struct *);
73
74extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
75extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
76struct task_struct *fork_idle(int);
77extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
78extern long kernel_wait4(pid_t, int *, int, struct rusage *);
79
80extern void free_task(struct task_struct *tsk);
81
82/* sched_exec is called by processes performing an exec */
83#ifdef CONFIG_SMP
84extern void sched_exec(void);
85#else
86#define sched_exec() {}
87#endif
88
89#define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
90
91extern void __put_task_struct(struct task_struct *t);
92
93static inline void put_task_struct(struct task_struct *t)
94{
95 if (atomic_dec_and_test(&t->usage))
96 __put_task_struct(t);
97}
98
99struct task_struct *task_rcu_dereference(struct task_struct **ptask);
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 */