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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 struct css_set;
 17 
 18 /* All the bits taken by the old clone syscall. */
 19 #define CLONE_LEGACY_FLAGS 0xffffffffULL
 20 
 21 struct kernel_clone_args {
 22         u64 flags;
 23         int __user *pidfd;
 24         int __user *child_tid;
 25         int __user *parent_tid;
 26         int exit_signal;
 27         unsigned long stack;
 28         unsigned long stack_size;
 29         unsigned long tls;
 30         pid_t *set_tid;
 31         /* Number of elements in *set_tid */
 32         size_t set_tid_size;
 33         int cgroup;
 34         struct cgroup *cgrp;
 35         struct css_set *cset;
 36 };
 37 
 38 /*
 39  * This serializes "schedule()" and also protects
 40  * the run-queue from deletions/modifications (but
 41  * _adding_ to the beginning of the run-queue has
 42  * a separate lock).
 43  */
 44 extern rwlock_t tasklist_lock;
 45 extern spinlock_t mmlist_lock;
 46 
 47 extern union thread_union init_thread_union;
 48 extern struct task_struct init_task;
 49 
 50 #ifdef CONFIG_PROVE_RCU
 51 extern int lockdep_tasklist_lock_is_held(void);
 52 #endif /* #ifdef CONFIG_PROVE_RCU */
 53 
 54 extern asmlinkage void schedule_tail(struct task_struct *prev);
 55 extern void init_idle(struct task_struct *idle, int cpu);
 56 
 57 extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
 58 extern void sched_dead(struct task_struct *p);
 59 
 60 void __noreturn do_task_dead(void);
 61 
 62 extern void proc_caches_init(void);
 63 
 64 extern void fork_init(void);
 65 
 66 extern void release_task(struct task_struct * p);
 67 
 68 #ifdef CONFIG_HAVE_COPY_THREAD_TLS
 69 extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
 70                         struct task_struct *, unsigned long);
 71 #else
 72 extern int copy_thread(unsigned long, unsigned long, unsigned long,
 73                         struct task_struct *);
 74 
 75 /* Architectures that haven't opted into copy_thread_tls get the tls argument
 76  * via pt_regs, so ignore the tls argument passed via C. */
 77 static inline int copy_thread_tls(
 78                 unsigned long clone_flags, unsigned long sp, unsigned long arg,
 79                 struct task_struct *p, unsigned long tls)
 80 {
 81         return copy_thread(clone_flags, sp, arg, p);
 82 }
 83 #endif
 84 extern void flush_thread(void);
 85 
 86 #ifdef CONFIG_HAVE_EXIT_THREAD
 87 extern void exit_thread(struct task_struct *tsk);
 88 #else
 89 static inline void exit_thread(struct task_struct *tsk)
 90 {
 91 }
 92 #endif
 93 extern void do_group_exit(int);
 94 
 95 extern void exit_files(struct task_struct *);
 96 extern void exit_itimers(struct signal_struct *);
 97 
 98 extern long _do_fork(struct kernel_clone_args *kargs);
 99 extern bool legacy_clone_args_valid(const struct kernel_clone_args *kargs);
100 extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
101 struct task_struct *fork_idle(int);
102 struct mm_struct *copy_init_mm(void);
103 extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
104 extern long kernel_wait4(pid_t, int __user *, int, struct rusage *);
105 
106 extern void free_task(struct task_struct *tsk);
107 
108 /* sched_exec is called by processes performing an exec */
109 #ifdef CONFIG_SMP
110 extern void sched_exec(void);
111 #else
112 #define sched_exec()   {}
113 #endif
114 
115 static inline struct task_struct *get_task_struct(struct task_struct *t)
116 {
117         refcount_inc(&t->usage);
118         return t;
119 }
120 
121 extern void __put_task_struct(struct task_struct *t);
122 
123 static inline void put_task_struct(struct task_struct *t)
124 {
125         if (refcount_dec_and_test(&t->usage))
126                 __put_task_struct(t);
127 }
128 
129 void put_task_struct_rcu_user(struct task_struct *task);
130 
131 #ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT
132 extern int arch_task_struct_size __read_mostly;
133 #else
134 # define arch_task_struct_size (sizeof(struct task_struct))
135 #endif
136 
137 #ifndef CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST
138 /*
139  * If an architecture has not declared a thread_struct whitelist we
140  * must assume something there may need to be copied to userspace.
141  */
142 static inline void arch_thread_struct_whitelist(unsigned long *offset,
143                                                 unsigned long *size)
144 {
145         *offset = 0;
146         /* Handle dynamically sized thread_struct. */
147         *size = arch_task_struct_size - offsetof(struct task_struct, thread);
148 }
149 #endif
150 
151 #ifdef CONFIG_VMAP_STACK
152 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
153 {
154         return t->stack_vm_area;
155 }
156 #else
157 static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
158 {
159         return NULL;
160 }
161 #endif
162 
163 /*
164  * Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
165  * subscriptions and synchronises with wait4().  Also used in procfs.  Also
166  * pins the final release of task.io_context.  Also protects ->cpuset and
167  * ->cgroup.subsys[]. And ->vfork_done.
168  *
169  * Nests both inside and outside of read_lock(&tasklist_lock).
170  * It must not be nested with write_lock_irq(&tasklist_lock),
171  * neither inside nor outside.
172  */
173 static inline void task_lock(struct task_struct *p)
174 {
175         spin_lock(&p->alloc_lock);
176 }
177 
178 static inline void task_unlock(struct task_struct *p)
179 {
180         spin_unlock(&p->alloc_lock);
181 }
182 
183 #endif /* _LINUX_SCHED_TASK_H */
184 

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