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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 #include <linux/uaccess.h>
 12 
 13 struct task_struct;
 14 struct rusage;
 15 union thread_union;
 16 
 17 /* All the bits taken by the old clone syscall. */
 18 #define CLONE_LEGACY_FLAGS 0xffffffffULL
 19 
 20 struct kernel_clone_args {
 21         u64 flags;
 22         int __user *pidfd;
 23         int __user *child_tid;
 24         int __user *parent_tid;
 25         int exit_signal;
 26         unsigned long stack;
 27         unsigned long stack_size;
 28         unsigned long tls;
 29         pid_t *set_tid;
 30         /* Number of elements in *set_tid */
 31         size_t set_tid_size;
 32 };
 33 
 34 /*
 35  * This serializes "schedule()" and also protects
 36  * the run-queue from deletions/modifications (but
 37  * _adding_ to the beginning of the run-queue has
 38  * a separate lock).
 39  */
 40 extern rwlock_t tasklist_lock;
 41 extern spinlock_t mmlist_lock;
 42 
 43 extern union thread_union init_thread_union;
 44 extern struct task_struct init_task;
 45 
 46 #ifdef CONFIG_PROVE_RCU
 47 extern int lockdep_tasklist_lock_is_held(void);
 48 #endif /* #ifdef CONFIG_PROVE_RCU */
 49 
 50 extern asmlinkage void schedule_tail(struct task_struct *prev);
 51 extern void init_idle(struct task_struct *idle, int cpu);
 52 
 53 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
 54 extern void sched_dead(struct task_struct *p);
 55 
 56 void __noreturn do_task_dead(void);
 57 
 58 extern void proc_caches_init(void);
 59 
 60 extern void fork_init(void);
 61 
 62 extern void release_task(struct task_struct * p);
 63 
 64 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
 65 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
 66                         struct task_struct *, unsigned long);
 67 #else
 68 extern int copy_thread(unsigned long, unsigned long, unsigned long,
 69                         struct task_struct *);
 70 
 71 /* Architectures that haven't opted into copy_thread_tls get the tls argument
 72  * via pt_regs, so ignore the tls argument passed via C. */
 73 static inline int copy_thread_tls(
 74                 unsigned long clone_flags, unsigned long sp, unsigned long arg,
 75                 struct task_struct *p, unsigned long tls)
 76 {
 77         return copy_thread(clone_flags, sp, arg, p);
 78 }
 79 #endif
 80 extern void flush_thread(void);
 81 
 82 #ifdef CONFIG_HAVE_EXIT_THREAD
 83 extern void exit_thread(struct task_struct *tsk);
 84 #else
 85 static inline void exit_thread(struct task_struct *tsk)
 86 {
 87 }
 88 #endif
 89 extern void do_group_exit(int);
 90 
 91 extern void exit_files(struct task_struct *);
 92 extern void exit_itimers(struct signal_struct *);
 93 
 94 extern long _do_fork(struct kernel_clone_args *kargs);
 95 extern bool legacy_clone_args_valid(const struct kernel_clone_args *kargs);
 96 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
 97 struct task_struct *fork_idle(int);
 98 struct mm_struct *copy_init_mm(void);
 99 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
100 extern long kernel_wait4(pid_t, int __user *, int, struct rusage *);
101 
102 extern void free_task(struct task_struct *tsk);
103 
104 /* sched_exec is called by processes performing an exec */
105 #ifdef CONFIG_SMP
106 extern void sched_exec(void);
107 #else
108 #define sched_exec()   {}
109 #endif
110 
111 static inline struct task_struct *get_task_struct(struct task_struct *t)
112 {
113         refcount_inc(&t->usage);
114         return t;
115 }
116 
117 extern void __put_task_struct(struct task_struct *t);
118 
119 static inline void put_task_struct(struct task_struct *t)
120 {
121         if (refcount_dec_and_test(&t->usage))
122                 __put_task_struct(t);
123 }
124 
125 void put_task_struct_rcu_user(struct task_struct *task);
126 
127 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
128 extern int arch_task_struct_size __read_mostly;
129 #else
130 # define arch_task_struct_size (sizeof(struct task_struct))
131 #endif
132 
133 #ifndef CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST
134 /*
135  * If an architecture has not declared a thread_struct whitelist we
136  * must assume something there may need to be copied to userspace.
137  */
138 static inline void arch_thread_struct_whitelist(unsigned long *offset,
139                                                 unsigned long *size)
140 {
141         *offset = 0;
142         /* Handle dynamically sized thread_struct. */
143         *size = arch_task_struct_size - offsetof(struct task_struct, thread);
144 }
145 #endif
146 
147 #ifdef CONFIG_VMAP_STACK
148 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
149 {
150         return t->stack_vm_area;
151 }
152 #else
153 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
154 {
155         return NULL;
156 }
157 #endif
158 
159 /*
160  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
161  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
162  * pins the final release of task.io_context.  Also protects ->cpuset and
163  * ->cgroup.subsys[]. And ->vfork_done.
164  *
165  * Nests both inside and outside of read_lock(&tasklist_lock).
166  * It must not be nested with write_lock_irq(&tasklist_lock),
167  * neither inside nor outside.
168  */
169 static inline void task_lock(struct task_struct *p)
170 {
171         spin_lock(&p->alloc_lock);
172 }
173 
174 static inline void task_unlock(struct task_struct *p)
175 {
176         spin_unlock(&p->alloc_lock);
177 }
178 
179 #endif /* _LINUX_SCHED_TASK_H */
180 

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