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Linux/include/linux/sched/task.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _LINUX_SCHED_TASK_H
  3 #define _LINUX_SCHED_TASK_H
  4 
  5 /*
  6  * Interface between the scheduler and various task lifetime (fork()/exit())
  7  * functionality:
  8  */
  9 
 10 #include <linux/sched.h>
 11 
 12 struct task_struct;
 13 struct rusage;
 14 union thread_union;
 15 
 16 /*
 17  * This serializes "schedule()" and also protects
 18  * the run-queue from deletions/modifications (but
 19  * _adding_ to the beginning of the run-queue has
 20  * a separate lock).
 21  */
 22 extern rwlock_t tasklist_lock;
 23 extern spinlock_t mmlist_lock;
 24 
 25 extern union thread_union init_thread_union;
 26 extern struct task_struct init_task;
 27 
 28 #ifdef CONFIG_PROVE_RCU
 29 extern int lockdep_tasklist_lock_is_held(void);
 30 #endif /* #ifdef CONFIG_PROVE_RCU */
 31 
 32 extern asmlinkage void schedule_tail(struct task_struct *prev);
 33 extern void init_idle(struct task_struct *idle, int cpu);
 34 
 35 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
 36 extern void sched_dead(struct task_struct *p);
 37 
 38 void __noreturn do_task_dead(void);
 39 
 40 extern void proc_caches_init(void);
 41 
 42 extern void release_task(struct task_struct * p);
 43 
 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);
 47 #else
 48 extern 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. */
 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)
 56 {
 57         return copy_thread(clone_flags, sp, arg, p);
 58 }
 59 #endif
 60 extern void flush_thread(void);
 61 
 62 #ifdef CONFIG_HAVE_EXIT_THREAD
 63 extern void exit_thread(struct task_struct *tsk);
 64 #else
 65 static inline void exit_thread(struct task_struct *tsk)
 66 {
 67 }
 68 #endif
 69 extern void do_group_exit(int);
 70 
 71 extern void exit_files(struct task_struct *);
 72 extern void exit_itimers(struct signal_struct *);
 73 
 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 __user *, int, struct rusage *);
 79 
 80 extern void free_task(struct task_struct *tsk);
 81 
 82 /* sched_exec is called by processes performing an exec */
 83 #ifdef CONFIG_SMP
 84 extern 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 
 91 extern void __put_task_struct(struct task_struct *t);
 92 
 93 static 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 
 99 struct task_struct *task_rcu_dereference(struct task_struct **ptask);
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 #ifndef CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST
108 /*
109  * If an architecture has not declared a thread_struct whitelist we
110  * must assume something there may need to be copied to userspace.
111  */
112 static inline void arch_thread_struct_whitelist(unsigned long *offset,
113                                                 unsigned long *size)
114 {
115         *offset = 0;
116         /* Handle dynamically sized thread_struct. */
117         *size = arch_task_struct_size - offsetof(struct task_struct, thread);
118 }
119 #endif
120 
121 #ifdef CONFIG_VMAP_STACK
122 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
123 {
124         return t->stack_vm_area;
125 }
126 #else
127 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
128 {
129         return NULL;
130 }
131 #endif
132 
133 /*
134  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
135  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
136  * pins the final release of task.io_context.  Also protects ->cpuset and
137  * ->cgroup.subsys[]. And ->vfork_done.
138  *
139  * Nests both inside and outside of read_lock(&tasklist_lock).
140  * It must not be nested with write_lock_irq(&tasklist_lock),
141  * neither inside nor outside.
142  */
143 static inline void task_lock(struct task_struct *p)
144 {
145         spin_lock(&p->alloc_lock);
146 }
147 
148 static inline void task_unlock(struct task_struct *p)
149 {
150         spin_unlock(&p->alloc_lock);
151 }
152 
153 #endif /* _LINUX_SCHED_TASK_H */
154 

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