blob: 4b1c3b664f517e5e35e6f581282e432649f734d7 [file] [log] [blame]
/* SPDX-License-Identifier: GPL-2.0 */
* Interface between the scheduler and various task lifetime (fork()/exit())
* functionality:
#include <linux/sched.h>
#include <linux/uaccess.h>
struct task_struct;
struct rusage;
union thread_union;
/* All the bits taken by the old clone syscall. */
#define CLONE_LEGACY_FLAGS 0xffffffffULL
struct kernel_clone_args {
u64 flags;
int __user *pidfd;
int __user *child_tid;
int __user *parent_tid;
int exit_signal;
unsigned long stack;
unsigned long stack_size;
unsigned long tls;
* This serializes "schedule()" and also protects
* the run-queue from deletions/modifications (but
* _adding_ to the beginning of the run-queue has
* a separate lock).
extern rwlock_t tasklist_lock;
extern spinlock_t mmlist_lock;
extern union thread_union init_thread_union;
extern struct task_struct init_task;
extern int lockdep_tasklist_lock_is_held(void);
#endif /* #ifdef CONFIG_PROVE_RCU */
extern asmlinkage void schedule_tail(struct task_struct *prev);
extern void init_idle(struct task_struct *idle, int cpu);
extern int sched_fork(unsigned long clone_flags, struct task_struct *p);
extern void sched_dead(struct task_struct *p);
void __noreturn do_task_dead(void);
extern void proc_caches_init(void);
extern void fork_init(void);
extern void release_task(struct task_struct * p);
extern int copy_thread_tls(unsigned long, unsigned long, unsigned long,
struct task_struct *, unsigned long);
extern int copy_thread(unsigned long, unsigned long, unsigned long,
struct task_struct *);
/* Architectures that haven't opted into copy_thread_tls get the tls argument
* via pt_regs, so ignore the tls argument passed via C. */
static inline int copy_thread_tls(
unsigned long clone_flags, unsigned long sp, unsigned long arg,
struct task_struct *p, unsigned long tls)
return copy_thread(clone_flags, sp, arg, p);
extern void flush_thread(void);
extern void exit_thread(struct task_struct *tsk);
static inline void exit_thread(struct task_struct *tsk)
extern void do_group_exit(int);
extern void exit_files(struct task_struct *);
extern void exit_itimers(struct signal_struct *);
extern long _do_fork(struct kernel_clone_args *kargs);
extern bool legacy_clone_args_valid(const struct kernel_clone_args *kargs);
extern long do_fork(unsigned long, unsigned long, unsigned long, int __user *, int __user *);
struct task_struct *fork_idle(int);
struct mm_struct *copy_init_mm(void);
extern pid_t kernel_thread(int (*fn)(void *), void *arg, unsigned long flags);
extern long kernel_wait4(pid_t, int __user *, int, struct rusage *);
extern void free_task(struct task_struct *tsk);
/* sched_exec is called by processes performing an exec */
extern void sched_exec(void);
#define sched_exec() {}
static inline struct task_struct *get_task_struct(struct task_struct *t)
return t;
extern void __put_task_struct(struct task_struct *t);
static inline void put_task_struct(struct task_struct *t)
if (refcount_dec_and_test(&t->usage))
void put_task_struct_rcu_user(struct task_struct *task);
extern int arch_task_struct_size __read_mostly;
# define arch_task_struct_size (sizeof(struct task_struct))
* If an architecture has not declared a thread_struct whitelist we
* must assume something there may need to be copied to userspace.
static inline void arch_thread_struct_whitelist(unsigned long *offset,
unsigned long *size)
*offset = 0;
/* Handle dynamically sized thread_struct. */
*size = arch_task_struct_size - offsetof(struct task_struct, thread);
static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
return t->stack_vm_area;
static inline struct vm_struct *task_stack_vm_area(const struct task_struct *t)
return NULL;
* Protects ->fs, ->files, ->mm, ->group_info, ->comm, keyring
* subscriptions and synchronises with wait4(). Also used in procfs. Also
* pins the final release of task.io_context. Also protects ->cpuset and
* ->cgroup.subsys[]. And ->vfork_done.
* Nests both inside and outside of read_lock(&tasklist_lock).
* It must not be nested with write_lock_irq(&tasklist_lock),
* neither inside nor outside.
static inline void task_lock(struct task_struct *p)
static inline void task_unlock(struct task_struct *p)
#endif /* _LINUX_SCHED_TASK_H */