1 #ifndef _LINUX_SCHED_TASK_H
2 #define _LINUX_SCHED_TASK_H
5 * Interface between the scheduler and various task lifetime (fork()/exit())
9 #include <linux/sched.h>
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
21 extern rwlock_t tasklist_lock
;
22 extern spinlock_t mmlist_lock
;
24 extern union thread_union init_thread_union
;
25 extern struct task_struct init_task
;
27 #ifdef CONFIG_PROVE_RCU
28 extern int lockdep_tasklist_lock_is_held(void);
29 #endif /* #ifdef CONFIG_PROVE_RCU */
31 extern asmlinkage
void schedule_tail(struct task_struct
*prev
);
32 extern void init_idle(struct task_struct
*idle
, int cpu
);
33 extern void init_idle_bootup_task(struct task_struct
*idle
);
35 extern int sched_fork(unsigned long clone_flags
, struct task_struct
*p
);
36 extern void sched_dead(struct task_struct
*p
);
38 void __noreturn
do_task_dead(void);
40 extern void proc_caches_init(void);
42 extern void release_task(struct task_struct
* p
);
44 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
45 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
46 struct task_struct
*, unsigned long);
48 extern int copy_thread(unsigned long, unsigned long, unsigned long,
49 struct task_struct
*);
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. */
53 static inline int copy_thread_tls(
54 unsigned long clone_flags
, unsigned long sp
, unsigned long arg
,
55 struct task_struct
*p
, unsigned long tls
)
57 return copy_thread(clone_flags
, sp
, arg
, p
);
60 extern void flush_thread(void);
62 #ifdef CONFIG_HAVE_EXIT_THREAD
63 extern void exit_thread(struct task_struct
*tsk
);
65 static inline void exit_thread(struct task_struct
*tsk
)
69 extern void do_group_exit(int);
71 extern void exit_files(struct task_struct
*);
72 extern void exit_itimers(struct signal_struct
*);
74 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*, unsigned long);
75 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user
*, int __user
*);
76 struct task_struct
*fork_idle(int);
77 extern pid_t
kernel_thread(int (*fn
)(void *), void *arg
, unsigned long flags
);
78 extern long kernel_wait4(pid_t
, int *, int, struct rusage
*);
80 extern void free_task(struct task_struct
*tsk
);
82 /* sched_exec is called by processes performing an exec */
84 extern void sched_exec(void);
86 #define sched_exec() {}
89 #define get_task_struct(tsk) do { atomic_inc(&(tsk)->usage); } while(0)
91 extern void __put_task_struct(struct task_struct
*t
);
93 static inline void put_task_struct(struct task_struct
*t
)
95 if (atomic_dec_and_test(&t
->usage
))
99 struct task_struct
*task_rcu_dereference(struct task_struct
**ptask
);
101 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
102 extern int arch_task_struct_size __read_mostly
;
104 # define arch_task_struct_size (sizeof(struct task_struct))
107 #ifdef CONFIG_VMAP_STACK
108 static inline struct vm_struct
*task_stack_vm_area(const struct task_struct
*t
)
110 return t
->stack_vm_area
;
113 static inline struct vm_struct
*task_stack_vm_area(const struct task_struct
*t
)
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.
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.
129 static inline void task_lock(struct task_struct
*p
)
131 spin_lock(&p
->alloc_lock
);
134 static inline void task_unlock(struct task_struct
*p
)
136 spin_unlock(&p
->alloc_lock
);
139 #endif /* _LINUX_SCHED_TASK_H */