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TOMOYO Linux Cross Reference
Linux/include/linux/sched/task.h

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  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 struct task_struct;
 12 union 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  */
 20 extern rwlock_t tasklist_lock;
 21 extern spinlock_t mmlist_lock;
 22 
 23 extern union thread_union init_thread_union;
 24 extern struct task_struct init_task;
 25 
 26 #ifdef CONFIG_PROVE_RCU
 27 extern int lockdep_tasklist_lock_is_held(void);
 28 #endif /* #ifdef CONFIG_PROVE_RCU */
 29 
 30 extern asmlinkage void schedule_tail(struct task_struct *prev);
 31 extern void init_idle(struct task_struct *idle, int cpu);
 32 extern void init_idle_bootup_task(struct task_struct *idle);
 33 
 34 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
 35 extern void sched_dead(struct task_struct *p);
 36 
 37 void __noreturn do_task_dead(void);
 38 
 39 extern void proc_caches_init(void);
 40 
 41 extern void release_task(struct task_struct * p);
 42 
 43 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
 44 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
 45                         struct task_struct *, unsigned long);
 46 #else
 47 extern 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. */
 52 static 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
 59 extern void flush_thread(void);
 60 
 61 #ifdef CONFIG_HAVE_EXIT_THREAD
 62 extern void exit_thread(struct task_struct *tsk);
 63 #else
 64 static inline void exit_thread(struct task_struct *tsk)
 65 {
 66 }
 67 #endif
 68 extern void do_group_exit(int);
 69 
 70 extern void exit_files(struct task_struct *);
 71 extern void exit_itimers(struct signal_struct *);
 72 
 73 extern long _do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *, unsigned long);
 74 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
 75 struct task_struct *fork_idle(int);
 76 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
 77 
 78 extern void free_task(struct task_struct *tsk);
 79 
 80 /* sched_exec is called by processes performing an exec */
 81 #ifdef CONFIG_SMP
 82 extern 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 
 89 extern void __put_task_struct(struct task_struct *t);
 90 
 91 static 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 
 97 struct task_struct *task_rcu_dereference(struct task_struct **ptask);
 98 struct task_struct *try_get_task_struct(struct task_struct **ptask);
 99 
100 
101 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
102 extern 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
108 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
109 {
110         return t->stack_vm_area;
111 }
112 #else
113 static 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  */
129 static inline void task_lock(struct task_struct *p)
130 {
131         spin_lock(&p->alloc_lock);
132 }
133 
134 static inline void task_unlock(struct task_struct *p)
135 {
136         spin_unlock(&p->alloc_lock);
137 }
138 
139 #endif /* _LINUX_SCHED_TASK_H */
140 

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