include/linux/sched/task.h

   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
  11 /*
  12  * This serializes "schedule()" and also protects
  13  * the run-queue from deletions/modifications (but
  14  * _adding_ to the beginning of the run-queue has
  15  * a separate lock).
  16  */
  17 extern rwlock_t tasklist_lock;
  18 extern spinlock_t mmlist_lock;
  19
  20 #ifdef CONFIG_PROVE_RCU
  21 extern int lockdep_tasklist_lock_is_held(void);
  22 #endif /* #ifdef CONFIG_PROVE_RCU */
  23
  24 extern asmlinkage void schedule_tail(struct task_struct *prev);
  25 extern void init_idle(struct task_struct *idle, int cpu);
  26 extern void init_idle_bootup_task(struct task_struct *idle);
  27
  28 static inline void rcu_copy_process(struct task_struct *p)
  29 {
  30 #ifdef CONFIG_PREEMPT_RCU
  31         p->rcu_read_lock_nesting = 0;
  32         p->rcu_read_unlock_special.s = 0;
  33         p->rcu_blocked_node = NULL;
  34         INIT_LIST_HEAD(&p->rcu_node_entry);
  35 #endif /* #ifdef CONFIG_PREEMPT_RCU */
  36 #ifdef CONFIG_TASKS_RCU
  37         p->rcu_tasks_holdout = false;
  38         INIT_LIST_HEAD(&p->rcu_tasks_holdout_list);
  39         p->rcu_tasks_idle_cpu = -1;
  40 #endif /* #ifdef CONFIG_TASKS_RCU */
  41 }
  42
  43 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
  44 extern void sched_dead(struct task_struct *p);
  45
  46 void __noreturn do_task_dead(void);
  47
  48 extern void proc_caches_init(void);
  49
  50 extern void release_task(struct task_struct * p);
  51
  52 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
  53 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
  54                         struct task_struct *, unsigned long);
  55 #else
  56 extern int copy_thread(unsigned long, unsigned long, unsigned long,
  57                         struct task_struct *);
  58
  59 /* Architectures that haven't opted into copy_thread_tls get the tls argument
  60  * via pt_regs, so ignore the tls argument passed via C. */
  61 static inline int copy_thread_tls(
  62                 unsigned long clone_flags, unsigned long sp, unsigned long arg,
  63                 struct task_struct *p, unsigned long tls)
  64 {
  65         return copy_thread(clone_flags, sp, arg, p);
  66 }
  67 #endif
  68 extern void flush_thread(void);
  69
  70 #ifdef CONFIG_HAVE_EXIT_THREAD
  71 extern void exit_thread(struct task_struct *tsk);
  72 #else
  73 static inline void exit_thread(struct task_struct *tsk)
  74 {
  75 }
  76 #endif
  77 extern void do_group_exit(int);
  78
  79 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
  80 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
  81 struct task_struct *fork_idle(int);
  82 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
  83
  84
  85 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
  86 extern int arch_task_struct_size __read_mostly;
  87 #else
  88 # define arch_task_struct_size (sizeof(struct task_struct))
  89 #endif
  90
  91 #ifdef CONFIG_VMAP_STACK
  92 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
  93 {
  94         return t->stack_vm_area;
  95 }
  96 #else
  97 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
  98 {
  99         return NULL;
 100 }
 101 #endif
 102
 103 #endif /* _LINUX_SCHED_TASK_H */