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176 lines
4.5 KiB
176 lines
4.5 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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#ifndef _LINUX_SCHED_TASK_H |
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#define _LINUX_SCHED_TASK_H |
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/* |
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* Interface between the scheduler and various task lifetime (fork()/exit()) |
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* functionality: |
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*/ |
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#include <linux/sched.h> |
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#include <linux/uaccess.h> |
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struct task_struct; |
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struct rusage; |
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union thread_union; |
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struct css_set; |
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/* All the bits taken by the old clone syscall. */ |
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#define CLONE_LEGACY_FLAGS 0xffffffffULL |
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struct kernel_clone_args { |
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u64 flags; |
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int __user *pidfd; |
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int __user *child_tid; |
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int __user *parent_tid; |
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int exit_signal; |
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unsigned long stack; |
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unsigned long stack_size; |
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unsigned long tls; |
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pid_t *set_tid; |
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/* Number of elements in *set_tid */ |
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size_t set_tid_size; |
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int cgroup; |
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int io_thread; |
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struct cgroup *cgrp; |
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struct css_set *cset; |
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}; |
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/* |
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* This serializes "schedule()" and also protects |
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* the run-queue from deletions/modifications (but |
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* _adding_ to the beginning of the run-queue has |
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* a separate lock). |
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*/ |
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extern rwlock_t tasklist_lock; |
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extern spinlock_t mmlist_lock; |
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extern union thread_union init_thread_union; |
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extern struct task_struct init_task; |
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extern int lockdep_tasklist_lock_is_held(void); |
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extern asmlinkage void schedule_tail(struct task_struct *prev); |
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extern void init_idle(struct task_struct *idle, int cpu); |
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extern int sched_fork(unsigned long clone_flags, struct task_struct *p); |
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extern void sched_post_fork(struct task_struct *p); |
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extern void sched_dead(struct task_struct *p); |
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void __noreturn do_task_dead(void); |
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extern void proc_caches_init(void); |
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extern void fork_init(void); |
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extern void release_task(struct task_struct * p); |
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extern int copy_thread(unsigned long, unsigned long, unsigned long, |
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struct task_struct *, unsigned long); |
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extern void flush_thread(void); |
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#ifdef CONFIG_HAVE_EXIT_THREAD |
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extern void exit_thread(struct task_struct *tsk); |
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#else |
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static inline void exit_thread(struct task_struct *tsk) |
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{ |
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} |
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#endif |
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extern void do_group_exit(int); |
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extern void exit_files(struct task_struct *); |
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extern void exit_itimers(struct signal_struct *); |
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extern pid_t kernel_clone(struct kernel_clone_args *kargs); |
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struct task_struct *create_io_thread(int (*fn)(void *), void *arg, int node); |
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struct task_struct *fork_idle(int); |
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struct mm_struct *copy_init_mm(void); |
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extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags); |
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extern long kernel_wait4(pid_t, int __user *, int, struct rusage *); |
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int kernel_wait(pid_t pid, int *stat); |
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extern void free_task(struct task_struct *tsk); |
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/* sched_exec is called by processes performing an exec */ |
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#ifdef CONFIG_SMP |
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extern void sched_exec(void); |
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#else |
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#define sched_exec() {} |
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#endif |
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static inline struct task_struct *get_task_struct(struct task_struct *t) |
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{ |
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refcount_inc(&t->usage); |
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return t; |
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} |
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extern void __put_task_struct(struct task_struct *t); |
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static inline void put_task_struct(struct task_struct *t) |
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{ |
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if (refcount_dec_and_test(&t->usage)) |
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__put_task_struct(t); |
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} |
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static inline void put_task_struct_many(struct task_struct *t, int nr) |
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{ |
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if (refcount_sub_and_test(nr, &t->usage)) |
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__put_task_struct(t); |
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} |
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void put_task_struct_rcu_user(struct task_struct *task); |
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#ifdef CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT |
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extern int arch_task_struct_size __read_mostly; |
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#else |
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# define arch_task_struct_size (sizeof(struct task_struct)) |
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#endif |
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#ifndef CONFIG_HAVE_ARCH_THREAD_STRUCT_WHITELIST |
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/* |
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* If an architecture has not declared a thread_struct whitelist we |
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* must assume something there may need to be copied to userspace. |
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*/ |
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static inline void arch_thread_struct_whitelist(unsigned long *offset, |
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unsigned long *size) |
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{ |
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*offset = 0; |
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/* Handle dynamically sized thread_struct. */ |
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*size = arch_task_struct_size - offsetof(struct task_struct, thread); |
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} |
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#endif |
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#ifdef CONFIG_VMAP_STACK |
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static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t) |
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{ |
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return t->stack_vm_area; |
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} |
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#else |
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static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t) |
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{ |
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return NULL; |
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} |
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#endif |
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/* |
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* Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring |
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* subscriptions and synchronises with wait4(). Also used in procfs. Also |
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* pins the final release of task.io_context. Also protects ->cpuset and |
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* ->cgroup.subsys[]. And ->vfork_done. |
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* |
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* Nests both inside and outside of read_lock(&tasklist_lock). |
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* It must not be nested with write_lock_irq(&tasklist_lock), |
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* neither inside nor outside. |
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*/ |
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static inline void task_lock(struct task_struct *p) |
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{ |
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spin_lock(&p->alloc_lock); |
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} |
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static inline void task_unlock(struct task_struct *p) |
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{ |
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spin_unlock(&p->alloc_lock); |
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} |
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#endif /* _LINUX_SCHED_TASK_H */
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