diff options
Diffstat (limited to 'linux-2.4-xen-sparse/include/linux/sched.h')
| -rw-r--r-- | linux-2.4-xen-sparse/include/linux/sched.h | 971 |
1 files changed, 0 insertions, 971 deletions
diff --git a/linux-2.4-xen-sparse/include/linux/sched.h b/linux-2.4-xen-sparse/include/linux/sched.h deleted file mode 100644 index 9e318d7ed6..0000000000 --- a/linux-2.4-xen-sparse/include/linux/sched.h +++ /dev/null @@ -1,971 +0,0 @@ -#ifndef _LINUX_SCHED_H -#define _LINUX_SCHED_H - -#include <asm/param.h> /* for HZ */ - -extern unsigned long event; - -#include <linux/config.h> -#include <linux/binfmts.h> -#include <linux/threads.h> -#include <linux/kernel.h> -#include <linux/types.h> -#include <linux/times.h> -#include <linux/timex.h> -#include <linux/rbtree.h> - -#include <asm/system.h> -#include <asm/semaphore.h> -#include <asm/page.h> -#include <asm/ptrace.h> -#include <asm/mmu.h> - -#include <linux/smp.h> -#include <linux/tty.h> -#include <linux/sem.h> -#include <linux/signal.h> -#include <linux/securebits.h> -#include <linux/fs_struct.h> - -struct exec_domain; - -/* - * cloning flags: - */ -#define CSIGNAL 0x000000ff /* signal mask to be sent at exit */ -#define CLONE_VM 0x00000100 /* set if VM shared between processes */ -#define CLONE_FS 0x00000200 /* set if fs info shared between processes */ -#define CLONE_FILES 0x00000400 /* set if open files shared between processes */ -#define CLONE_SIGHAND 0x00000800 /* set if signal handlers and blocked signals shared */ -#define CLONE_PID 0x00001000 /* set if pid shared */ -#define CLONE_PTRACE 0x00002000 /* set if we want to let tracing continue on the child too */ -#define CLONE_VFORK 0x00004000 /* set if the parent wants the child to wake it up on mm_release */ -#define CLONE_PARENT 0x00008000 /* set if we want to have the same parent as the cloner */ -#define CLONE_THREAD 0x00010000 /* Same thread group? */ -#define CLONE_NEWNS 0x00020000 /* New namespace group? */ - -#define CLONE_SIGNAL (CLONE_SIGHAND | CLONE_THREAD) - -/* - * These are the constant used to fake the fixed-point load-average - * counting. Some notes: - * - 11 bit fractions expand to 22 bits by the multiplies: this gives - * a load-average precision of 10 bits integer + 11 bits fractional - * - if you want to count load-averages more often, you need more - * precision, or rounding will get you. With 2-second counting freq, - * the EXP_n values would be 1981, 2034 and 2043 if still using only - * 11 bit fractions. - */ -extern unsigned long avenrun[]; /* Load averages */ - -#define FSHIFT 11 /* nr of bits of precision */ -#define FIXED_1 (1<<FSHIFT) /* 1.0 as fixed-point */ -#define LOAD_FREQ (5*HZ) /* 5 sec intervals */ -#define EXP_1 1884 /* 1/exp(5sec/1min) as fixed-point */ -#define EXP_5 2014 /* 1/exp(5sec/5min) */ -#define EXP_15 2037 /* 1/exp(5sec/15min) */ - -#define CALC_LOAD(load,exp,n) \ - load *= exp; \ - load += n*(FIXED_1-exp); \ - load >>= FSHIFT; - -#define CT_TO_SECS(x) ((x) / HZ) -#define CT_TO_USECS(x) (((x) % HZ) * 1000000/HZ) - -extern int nr_running, nr_threads; -extern int last_pid; - -#include <linux/fs.h> -#include <linux/time.h> -#include <linux/param.h> -#include <linux/resource.h> -#ifdef __KERNEL__ -#include <linux/timer.h> -#endif - -#include <asm/processor.h> - -#define TASK_RUNNING 0 -#define TASK_INTERRUPTIBLE 1 -#define TASK_UNINTERRUPTIBLE 2 -#define TASK_ZOMBIE 4 -#define TASK_STOPPED 8 - -#define __set_task_state(tsk, state_value) \ - do { (tsk)->state = (state_value); } while (0) -#define set_task_state(tsk, state_value) \ - set_mb((tsk)->state, (state_value)) - -#define __set_current_state(state_value) \ - do { current->state = (state_value); } while (0) -#define set_current_state(state_value) \ - set_mb(current->state, (state_value)) - -/* - * Scheduling policies - */ -#define SCHED_OTHER 0 -#define SCHED_FIFO 1 -#define SCHED_RR 2 - -/* - * This is an additional bit set when we want to - * yield the CPU for one re-schedule.. - */ -#define SCHED_YIELD 0x10 - -struct sched_param { - int sched_priority; -}; - -struct completion; - -#ifdef __KERNEL__ - -#include <linux/spinlock.h> - -/* - * 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 runqueue_lock; -extern spinlock_t mmlist_lock; - -extern void sched_init(void); -extern void init_idle(void); -extern void show_state(void); -extern void cpu_init (void); -extern void trap_init(void); -extern void update_process_times(int user); -#ifdef CONFIG_NO_IDLE_HZ -extern void update_process_times_us(int user, int system); -#endif -extern void update_one_process(struct task_struct *p, unsigned long user, - unsigned long system, int cpu); - -#define MAX_SCHEDULE_TIMEOUT LONG_MAX -extern signed long FASTCALL(schedule_timeout(signed long timeout)); -asmlinkage void schedule(void); - -extern int schedule_task(struct tq_struct *task); -extern void flush_scheduled_tasks(void); -extern int start_context_thread(void); -extern int current_is_keventd(void); - -#if CONFIG_SMP -extern void set_cpus_allowed(struct task_struct *p, unsigned long new_mask); -#else -# define set_cpus_allowed(p, new_mask) do { } while (0) -#endif - -/* - * The default fd array needs to be at least BITS_PER_LONG, - * as this is the granularity returned by copy_fdset(). - */ -#define NR_OPEN_DEFAULT BITS_PER_LONG - -struct namespace; -/* - * Open file table structure - */ -struct files_struct { - atomic_t count; - rwlock_t file_lock; /* Protects all the below members. Nests inside tsk->alloc_lock */ - int max_fds; - int max_fdset; - int next_fd; - struct file ** fd; /* current fd array */ - fd_set *close_on_exec; - fd_set *open_fds; - fd_set close_on_exec_init; - fd_set open_fds_init; - struct file * fd_array[NR_OPEN_DEFAULT]; -}; - -#define INIT_FILES \ -{ \ - count: ATOMIC_INIT(1), \ - file_lock: RW_LOCK_UNLOCKED, \ - max_fds: NR_OPEN_DEFAULT, \ - max_fdset: __FD_SETSIZE, \ - next_fd: 0, \ - fd: &init_files.fd_array[0], \ - close_on_exec: &init_files.close_on_exec_init, \ - open_fds: &init_files.open_fds_init, \ - close_on_exec_init: { { 0, } }, \ - open_fds_init: { { 0, } }, \ - fd_array: { NULL, } \ -} - -/* Maximum number of active map areas.. This is a random (large) number */ -#define DEFAULT_MAX_MAP_COUNT (65536) - -extern int max_map_count; - -struct mm_struct { - struct vm_area_struct * mmap; /* list of VMAs */ - rb_root_t mm_rb; - struct vm_area_struct * mmap_cache; /* last find_vma result */ - pgd_t * pgd; - atomic_t mm_users; /* How many users with user space? */ - atomic_t mm_count; /* How many references to "struct mm_struct" (users count as 1) */ - int map_count; /* number of VMAs */ - struct rw_semaphore mmap_sem; - spinlock_t page_table_lock; /* Protects task page tables and mm->rss */ - - struct list_head mmlist; /* List of all active mm's. These are globally strung - * together off init_mm.mmlist, and are protected - * by mmlist_lock - */ - - unsigned long start_code, end_code, start_data, end_data; - unsigned long start_brk, brk, start_stack; - unsigned long arg_start, arg_end, env_start, env_end; - unsigned long rss, total_vm, locked_vm; - unsigned long def_flags; - unsigned long cpu_vm_mask; - unsigned long swap_address; - - unsigned dumpable:1; - - /* Architecture-specific MM context */ - mm_context_t context; -}; - -extern int mmlist_nr; - -#define INIT_MM(name) \ -{ \ - mm_rb: RB_ROOT, \ - pgd: swapper_pg_dir, \ - mm_users: ATOMIC_INIT(2), \ - mm_count: ATOMIC_INIT(1), \ - mmap_sem: __RWSEM_INITIALIZER(name.mmap_sem), \ - page_table_lock: SPIN_LOCK_UNLOCKED, \ - mmlist: LIST_HEAD_INIT(name.mmlist), \ -} - -struct signal_struct { - atomic_t count; - struct k_sigaction action[_NSIG]; - spinlock_t siglock; -}; - - -#define INIT_SIGNALS { \ - count: ATOMIC_INIT(1), \ - action: { {{0,}}, }, \ - siglock: SPIN_LOCK_UNLOCKED \ -} - -/* - * Some day this will be a full-fledged user tracking system.. - */ -struct user_struct { - atomic_t __count; /* reference count */ - atomic_t processes; /* How many processes does this user have? */ - atomic_t files; /* How many open files does this user have? */ - - /* Hash table maintenance information */ - struct user_struct *next, **pprev; - uid_t uid; -}; - -#define get_current_user() ({ \ - struct user_struct *__tmp_user = current->user; \ - atomic_inc(&__tmp_user->__count); \ - __tmp_user; }) - -extern struct user_struct root_user; -#define INIT_USER (&root_user) - -struct task_struct { - /* - * offsets of these are hardcoded elsewhere - touch with care - */ - volatile long state; /* -1 unrunnable, 0 runnable, >0 stopped */ - unsigned long flags; /* per process flags, defined below */ - int sigpending; - mm_segment_t addr_limit; /* thread address space: - 0-0xBFFFFFFF for user-thead - 0-0xFFFFFFFF for kernel-thread - */ - struct exec_domain *exec_domain; - volatile long need_resched; - unsigned long ptrace; - - int lock_depth; /* Lock depth */ - -/* - * offset 32 begins here on 32-bit platforms. We keep - * all fields in a single cacheline that are needed for - * the goodness() loop in schedule(). - */ - long counter; - long nice; - unsigned long policy; - struct mm_struct *mm; - int processor; - /* - * cpus_runnable is ~0 if the process is not running on any - * CPU. It's (1 << cpu) if it's running on a CPU. This mask - * is updated under the runqueue lock. - * - * To determine whether a process might run on a CPU, this - * mask is AND-ed with cpus_allowed. - */ - unsigned long cpus_runnable, cpus_allowed; - /* - * (only the 'next' pointer fits into the cacheline, but - * that's just fine.) - */ - struct list_head run_list; - unsigned long sleep_time; - - struct task_struct *next_task, *prev_task; - struct mm_struct *active_mm; - struct list_head local_pages; - unsigned int allocation_order, nr_local_pages; - -/* task state */ - struct linux_binfmt *binfmt; - int exit_code, exit_signal; - int pdeath_signal; /* The signal sent when the parent dies */ - /* ??? */ - unsigned long personality; - int did_exec:1; - unsigned task_dumpable:1; - pid_t pid; - pid_t pgrp; - pid_t tty_old_pgrp; - pid_t session; - pid_t tgid; - /* boolean value for session group leader */ - int leader; - /* - * pointers to (original) parent process, youngest child, younger sibling, - * older sibling, respectively. (p->father can be replaced with - * p->p_pptr->pid) - */ - struct task_struct *p_opptr, *p_pptr, *p_cptr, *p_ysptr, *p_osptr; - struct list_head thread_group; - - /* PID hash table linkage. */ - struct task_struct *pidhash_next; - struct task_struct **pidhash_pprev; - - wait_queue_head_t wait_chldexit; /* for wait4() */ - struct completion *vfork_done; /* for vfork() */ - unsigned long rt_priority; - unsigned long it_real_value, it_prof_value, it_virt_value; - unsigned long it_real_incr, it_prof_incr, it_virt_incr; - struct timer_list real_timer; - struct tms times; - unsigned long start_time; - long per_cpu_utime[NR_CPUS], per_cpu_stime[NR_CPUS]; -/* mm fault and swap info: this can arguably be seen as either mm-specific or thread-specific */ - unsigned long min_flt, maj_flt, nswap, cmin_flt, cmaj_flt, cnswap; - int swappable:1; -/* process credentials */ - uid_t uid,euid,suid,fsuid; - gid_t gid,egid,sgid,fsgid; - int ngroups; - gid_t groups[NGROUPS]; - kernel_cap_t cap_effective, cap_inheritable, cap_permitted; - int keep_capabilities:1; - struct user_struct *user; -/* limits */ - struct rlimit rlim[RLIM_NLIMITS]; - unsigned short used_math; - char comm[16]; -/* file system info */ - int link_count, total_link_count; - struct tty_struct *tty; /* NULL if no tty */ - unsigned int locks; /* How many file locks are being held */ -/* ipc stuff */ - struct sem_undo *semundo; - struct sem_queue *semsleeping; -/* CPU-specific state of this task */ - struct thread_struct thread; -/* filesystem information */ - struct fs_struct *fs; -/* open file information */ - struct files_struct *files; -/* namespace */ - struct namespace *namespace; -/* signal handlers */ - spinlock_t sigmask_lock; /* Protects signal and blocked */ - struct signal_struct *sig; - - sigset_t blocked; - struct sigpending pending; - - unsigned long sas_ss_sp; - size_t sas_ss_size; - int (*notifier)(void *priv); - void *notifier_data; - sigset_t *notifier_mask; - -/* Thread group tracking */ - u32 parent_exec_id; - u32 self_exec_id; -/* Protection of (de-)allocation: mm, files, fs, tty */ - spinlock_t alloc_lock; - -/* journalling filesystem info */ - void *journal_info; -}; - -/* - * Per process flags - */ -#define PF_ALIGNWARN 0x00000001 /* Print alignment warning msgs */ - /* Not implemented yet, only for 486*/ -#define PF_STARTING 0x00000002 /* being created */ -#define PF_EXITING 0x00000004 /* getting shut down */ -#define PF_FORKNOEXEC 0x00000040 /* forked but didn't exec */ -#define PF_SUPERPRIV 0x00000100 /* used super-user privileges */ -#define PF_DUMPCORE 0x00000200 /* dumped core */ -#define PF_SIGNALED 0x00000400 /* killed by a signal */ -#define PF_MEMALLOC 0x00000800 /* Allocating memory */ -#define PF_MEMDIE 0x00001000 /* Killed for out-of-memory */ -#define PF_FREE_PAGES 0x00002000 /* per process page freeing */ -#define PF_NOIO 0x00004000 /* avoid generating further I/O */ -#define PF_FSTRANS 0x00008000 /* inside a filesystem transaction */ - -#define PF_USEDFPU 0x00100000 /* task used FPU this quantum (SMP) */ - -/* - * Ptrace flags - */ - -#define PT_PTRACED 0x00000001 -#define PT_TRACESYS 0x00000002 -#define PT_DTRACE 0x00000004 /* delayed trace (used on m68k, i386) */ -#define PT_TRACESYSGOOD 0x00000008 -#define PT_PTRACE_CAP 0x00000010 /* ptracer can follow suid-exec */ - -#define is_dumpable(tsk) ((tsk)->task_dumpable && (tsk)->mm && (tsk)->mm->dumpable) - -/* - * Limit the stack by to some sane default: root can always - * increase this limit if needed.. 8MB seems reasonable. - */ -#define _STK_LIM (8*1024*1024) - -#define DEF_COUNTER (10*HZ/100) /* 100 ms time slice */ -#define MAX_COUNTER (20*HZ/100) -#define DEF_NICE (0) - -extern void yield(void); - -/* - * The default (Linux) execution domain. - */ -extern struct exec_domain default_exec_domain; - -/* - * INIT_TASK is used to set up the first task table, touch at - * your own risk!. Base=0, limit=0x1fffff (=2MB) - */ -#define INIT_TASK(tsk) \ -{ \ - state: 0, \ - flags: 0, \ - sigpending: 0, \ - addr_limit: KERNEL_DS, \ - exec_domain: &default_exec_domain, \ - lock_depth: -1, \ - counter: DEF_COUNTER, \ - nice: DEF_NICE, \ - policy: SCHED_OTHER, \ - mm: NULL, \ - active_mm: &init_mm, \ - cpus_runnable: ~0UL, \ - cpus_allowed: ~0UL, \ - run_list: LIST_HEAD_INIT(tsk.run_list), \ - next_task: &tsk, \ - prev_task: &tsk, \ - p_opptr: &tsk, \ - p_pptr: &tsk, \ - thread_group: LIST_HEAD_INIT(tsk.thread_group), \ - wait_chldexit: __WAIT_QUEUE_HEAD_INITIALIZER(tsk.wait_chldexit),\ - real_timer: { \ - function: it_real_fn \ - }, \ - cap_effective: CAP_INIT_EFF_SET, \ - cap_inheritable: CAP_INIT_INH_SET, \ - cap_permitted: CAP_FULL_SET, \ - keep_capabilities: 0, \ - rlim: INIT_RLIMITS, \ - user: INIT_USER, \ - comm: "swapper", \ - thread: INIT_THREAD, \ - fs: &init_fs, \ - files: &init_files, \ - sigmask_lock: SPIN_LOCK_UNLOCKED, \ - sig: &init_signals, \ - pending: { NULL, &tsk.pending.head, {{0}}}, \ - blocked: {{0}}, \ - alloc_lock: SPIN_LOCK_UNLOCKED, \ - journal_info: NULL, \ -} - - -#ifndef INIT_TASK_SIZE -# define INIT_TASK_SIZE 2048*sizeof(long) -#endif - -union task_union { - struct task_struct task; - unsigned long stack[INIT_TASK_SIZE/sizeof(long)]; -}; - -extern union task_union init_task_union; - -extern struct mm_struct init_mm; -extern struct task_struct *init_tasks[NR_CPUS]; - -/* PID hashing. (shouldnt this be dynamic?) */ -#define PIDHASH_SZ (4096 >> 2) -extern struct task_struct *pidhash[PIDHASH_SZ]; - -#define pid_hashfn(x) ((((x) >> 8) ^ (x)) & (PIDHASH_SZ - 1)) - -static inline void hash_pid(struct task_struct *p) -{ - struct task_struct **htable = &pidhash[pid_hashfn(p->pid)]; - - if((p->pidhash_next = *htable) != NULL) - (*htable)->pidhash_pprev = &p->pidhash_next; - *htable = p; - p->pidhash_pprev = htable; -} - -static inline void unhash_pid(struct task_struct *p) -{ - if(p->pidhash_next) - p->pidhash_next->pidhash_pprev = p->pidhash_pprev; - *p->pidhash_pprev = p->pidhash_next; -} - -static inline struct task_struct *find_task_by_pid(int pid) -{ - struct task_struct *p, **htable = &pidhash[pid_hashfn(pid)]; - - for(p = *htable; p && p->pid != pid; p = p->pidhash_next) - ; - - return p; -} - -#define task_has_cpu(tsk) ((tsk)->cpus_runnable != ~0UL) - -static inline void task_set_cpu(struct task_struct *tsk, unsigned int cpu) -{ - tsk->processor = cpu; - tsk->cpus_runnable = 1UL << cpu; -} - -static inline void task_release_cpu(struct task_struct *tsk) -{ - tsk->cpus_runnable = ~0UL; -} - -/* per-UID process charging. */ -extern struct user_struct * alloc_uid(uid_t); -extern void free_uid(struct user_struct *); -extern void switch_uid(struct user_struct *); - -#include <asm/current.h> - -extern unsigned long volatile jiffies; -extern unsigned long itimer_ticks; -extern unsigned long itimer_next; -extern struct timeval xtime; -extern void do_timer(struct pt_regs *); -#ifdef CONFIG_NO_IDLE_HZ -extern void do_timer_ticks(int ticks); -#endif - -extern unsigned int * prof_buffer; -extern unsigned long prof_len; -extern unsigned long prof_shift; - -#define CURRENT_TIME (xtime.tv_sec) - -extern void FASTCALL(__wake_up(wait_queue_head_t *q, unsigned int mode, int nr)); -extern void FASTCALL(__wake_up_sync(wait_queue_head_t *q, unsigned int mode, int nr)); -extern void FASTCALL(sleep_on(wait_queue_head_t *q)); -extern long FASTCALL(sleep_on_timeout(wait_queue_head_t *q, - signed long timeout)); -extern void FASTCALL(interruptible_sleep_on(wait_queue_head_t *q)); -extern long FASTCALL(interruptible_sleep_on_timeout(wait_queue_head_t *q, - signed long timeout)); -extern int FASTCALL(wake_up_process(struct task_struct * tsk)); - -#define wake_up(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1) -#define wake_up_nr(x, nr) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr) -#define wake_up_all(x) __wake_up((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 0) -#define wake_up_sync(x) __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, 1) -#define wake_up_sync_nr(x, nr) __wake_up_sync((x),TASK_UNINTERRUPTIBLE | TASK_INTERRUPTIBLE, nr) -#define wake_up_interruptible(x) __wake_up((x),TASK_INTERRUPTIBLE, 1) -#define wake_up_interruptible_nr(x, nr) __wake_up((x),TASK_INTERRUPTIBLE, nr) -#define wake_up_interruptible_all(x) __wake_up((x),TASK_INTERRUPTIBLE, 0) -#define wake_up_interruptible_sync(x) __wake_up_sync((x),TASK_INTERRUPTIBLE, 1) -#define wake_up_interruptible_sync_nr(x, nr) __wake_up_sync((x),TASK_INTERRUPTIBLE, nr) -asmlinkage long sys_wait4(pid_t pid,unsigned int * stat_addr, int options, struct rusage * ru); - -extern int in_group_p(gid_t); -extern int in_egroup_p(gid_t); - -extern void proc_caches_init(void); -extern void flush_signals(struct task_struct *); -extern void flush_signal_handlers(struct task_struct *); -extern void sig_exit(int, int, struct siginfo *); -extern int dequeue_signal(sigset_t *, siginfo_t *); -extern void block_all_signals(int (*notifier)(void *priv), void *priv, - sigset_t *mask); -extern void unblock_all_signals(void); -extern int send_sig_info(int, struct siginfo *, struct task_struct *); -extern int force_sig_info(int, struct siginfo *, struct task_struct *); -extern int kill_pg_info(int, struct siginfo *, pid_t); -extern int kill_sl_info(int, struct siginfo *, pid_t); -extern int kill_proc_info(int, struct siginfo *, pid_t); -extern void notify_parent(struct task_struct *, int); -extern void do_notify_parent(struct task_struct *, int); -extern void force_sig(int, struct task_struct *); -extern int send_sig(int, struct task_struct *, int); -extern int kill_pg(pid_t, int, int); -extern int kill_sl(pid_t, int, int); -extern int kill_proc(pid_t, int, int); -extern int do_sigaction(int, const struct k_sigaction *, struct k_sigaction *); -extern int do_sigaltstack(const stack_t *, stack_t *, unsigned long); - -static inline int signal_pending(struct task_struct *p) -{ - return (p->sigpending != 0); -} - -/* - * Re-calculate pending state from the set of locally pending - * signals, globally pending signals, and blocked signals. - */ -static inline int has_pending_signals(sigset_t *signal, sigset_t *blocked) -{ - unsigned long ready; - long i; - - switch (_NSIG_WORDS) { - default: - for (i = _NSIG_WORDS, ready = 0; --i >= 0 ;) - ready |= signal->sig[i] &~ blocked->sig[i]; - break; - - case 4: ready = signal->sig[3] &~ blocked->sig[3]; - ready |= signal->sig[2] &~ blocked->sig[2]; - ready |= signal->sig[1] &~ blocked->sig[1]; - ready |= signal->sig[0] &~ blocked->sig[0]; - break; - - case 2: ready = signal->sig[1] &~ blocked->sig[1]; - ready |= signal->sig[0] &~ blocked->sig[0]; - break; - - case 1: ready = signal->sig[0] &~ blocked->sig[0]; - } - return ready != 0; -} - -/* Reevaluate whether the task has signals pending delivery. - This is required every time the blocked sigset_t changes. - All callers should have t->sigmask_lock. */ - -static inline void recalc_sigpending(struct task_struct *t) -{ - t->sigpending = has_pending_signals(&t->pending.signal, &t->blocked); -} - -/* True if we are on the alternate signal stack. */ - -static inline int on_sig_stack(unsigned long sp) -{ - return (sp - current->sas_ss_sp < current->sas_ss_size); -} - -static inline int sas_ss_flags(unsigned long sp) -{ - return (current->sas_ss_size == 0 ? SS_DISABLE - : on_sig_stack(sp) ? SS_ONSTACK : 0); -} - -extern int request_irq(unsigned int, - void (*handler)(int, void *, struct pt_regs *), - unsigned long, const char *, void *); -extern void free_irq(unsigned int, void *); - -/* - * This has now become a routine instead of a macro, it sets a flag if - * it returns true (to do BSD-style accounting where the process is flagged - * if it uses root privs). The implication of this is that you should do - * normal permissions checks first, and check suser() last. - * - * [Dec 1997 -- Chris Evans] - * For correctness, the above considerations need to be extended to - * fsuser(). This is done, along with moving fsuser() checks to be - * last. - * - * These will be removed, but in the mean time, when the SECURE_NOROOT - * flag is set, uids don't grant privilege. - */ -static inline int suser(void) -{ - if (!issecure(SECURE_NOROOT) && current->euid == 0) { - current->flags |= PF_SUPERPRIV; - return 1; - } - return 0; -} - -static inline int fsuser(void) -{ - if (!issecure(SECURE_NOROOT) && current->fsuid == 0) { - current->flags |= PF_SUPERPRIV; - return 1; - } - return 0; -} - -/* - * capable() checks for a particular capability. - * New privilege checks should use this interface, rather than suser() or - * fsuser(). See include/linux/capability.h for defined capabilities. - */ - -static inline int capable(int cap) -{ -#if 1 /* ok now */ - if (cap_raised(current->cap_effective, cap)) -#else - if (cap_is_fs_cap(cap) ? current->fsuid == 0 : current->euid == 0) -#endif - { - current->flags |= PF_SUPERPRIV; - return 1; - } - return 0; -} - -/* - * Routines for handling mm_structs - */ -extern struct mm_struct * mm_alloc(void); - -extern struct mm_struct * start_lazy_tlb(void); -extern void end_lazy_tlb(struct mm_struct *mm); - -/* mmdrop drops the mm and the page tables */ -extern void FASTCALL(__mmdrop(struct mm_struct *)); -static inline void mmdrop(struct mm_struct * mm) -{ - if (atomic_dec_and_test(&mm->mm_count)) - __mmdrop(mm); -} - -/* mmput gets rid of the mappings and all user-space */ -extern void mmput(struct mm_struct *); -/* Remove the current tasks stale references to the old mm_struct */ -extern void mm_release(void); - -/* - * Routines for handling the fd arrays - */ -extern struct file ** alloc_fd_array(int); -extern int expand_fd_array(struct files_struct *, int nr); -extern void free_fd_array(struct file **, int); - -extern fd_set *alloc_fdset(int); -extern int expand_fdset(struct files_struct *, int nr); -extern void free_fdset(fd_set *, int); - -extern int copy_thread(int, unsigned long, unsigned long, unsigned long, struct task_struct *, struct pt_regs *); -extern void flush_thread(void); -extern void exit_thread(void); - -extern void exit_mm(struct task_struct *); -extern void exit_files(struct task_struct *); -extern void exit_sighand(struct task_struct *); - -extern void reparent_to_init(void); -extern void daemonize(void); - -extern int do_execve(char *, char **, char **, struct pt_regs *); -extern int do_fork(unsigned long, unsigned long, struct pt_regs *, unsigned long); - -extern void set_task_comm(struct task_struct *tsk, char *from); -extern void get_task_comm(char *to, struct task_struct *tsk); - -extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); -extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait)); -extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); - -extern long kernel_thread(int (*fn)(void *), void * arg, unsigned long flags); - -#define __wait_event(wq, condition) \ -do { \ - wait_queue_t __wait; \ - init_waitqueue_entry(&__wait, current); \ - \ - add_wait_queue(&wq, &__wait); \ - for (;;) { \ - set_current_state(TASK_UNINTERRUPTIBLE); \ - if (condition) \ - break; \ - schedule(); \ - } \ - current->state = TASK_RUNNING; \ - remove_wait_queue(&wq, &__wait); \ -} while (0) - -#define wait_event(wq, condition) \ -do { \ - if (condition) \ - break; \ - __wait_event(wq, condition); \ -} while (0) - -#define __wait_event_interruptible(wq, condition, ret) \ -do { \ - wait_queue_t __wait; \ - init_waitqueue_entry(&__wait, current); \ - \ - add_wait_queue(&wq, &__wait); \ - for (;;) { \ - set_current_state(TASK_INTERRUPTIBLE); \ - if (condition) \ - break; \ - if (!signal_pending(current)) { \ - schedule(); \ - continue; \ - } \ - ret = -ERESTARTSYS; \ - break; \ - } \ - current->state = TASK_RUNNING; \ - remove_wait_queue(&wq, &__wait); \ -} while (0) - -#define wait_event_interruptible(wq, condition) \ -({ \ - int __ret = 0; \ - if (!(condition)) \ - __wait_event_interruptible(wq, condition, __ret); \ - __ret; \ -}) - -#define REMOVE_LINKS(p) do { \ - (p)->next_task->prev_task = (p)->prev_task; \ - (p)->prev_task->next_task = (p)->next_task; \ - if ((p)->p_osptr) \ - (p)->p_osptr->p_ysptr = (p)->p_ysptr; \ - if ((p)->p_ysptr) \ - (p)->p_ysptr->p_osptr = (p)->p_osptr; \ - else \ - (p)->p_pptr->p_cptr = (p)->p_osptr; \ - } while (0) - -#define SET_LINKS(p) do { \ - (p)->next_task = &init_task; \ - (p)->prev_task = init_task.prev_task; \ - init_task.prev_task->next_task = (p); \ - init_task.prev_task = (p); \ - (p)->p_ysptr = NULL; \ - if (((p)->p_osptr = (p)->p_pptr->p_cptr) != NULL) \ - (p)->p_osptr->p_ysptr = p; \ - (p)->p_pptr->p_cptr = p; \ - } while (0) - -#define for_each_task(p) \ - for (p = &init_task ; (p = p->next_task) != &init_task ; ) - -#define for_each_thread(task) \ - for (task = next_thread(current) ; task != current ; task = next_thread(task)) - -#define next_thread(p) \ - list_entry((p)->thread_group.next, struct task_struct, thread_group) - -#define thread_group_leader(p) (p->pid == p->tgid) - -static inline void del_from_runqueue(struct task_struct * p) -{ - nr_running--; - p->sleep_time = jiffies; - list_del(&p->run_list); - p->run_list.next = NULL; -} - -static inline int task_on_runqueue(struct task_struct *p) -{ - return (p->run_list.next != NULL); -} - -static inline void unhash_process(struct task_struct *p) -{ - if (task_on_runqueue(p)) - out_of_line_bug(); - write_lock_irq(&tasklist_lock); - nr_threads--; - unhash_pid(p); - REMOVE_LINKS(p); - list_del(&p->thread_group); - write_unlock_irq(&tasklist_lock); -} - -/* Protects ->fs, ->files, ->mm, and synchronises with wait4(). Nests inside tasklist_lock */ -static inline void task_lock(struct task_struct *p) -{ - spin_lock(&p->alloc_lock); -} - -static inline void task_unlock(struct task_struct *p) -{ - spin_unlock(&p->alloc_lock); -} - -/* write full pathname into buffer and return start of pathname */ -static inline char * d_path(struct dentry *dentry, struct vfsmount *vfsmnt, - char *buf, int buflen) -{ - char *res; - struct vfsmount *rootmnt; - struct dentry *root; - read_lock(¤t->fs->lock); - rootmnt = mntget(current->fs->rootmnt); - root = dget(current->fs->root); - read_unlock(¤t->fs->lock); - spin_lock(&dcache_lock); - res = __d_path(dentry, vfsmnt, root, rootmnt, buf, buflen); - spin_unlock(&dcache_lock); - dput(root); - mntput(rootmnt); - return res; -} - -static inline int need_resched(void) -{ - return (unlikely(current->need_resched)); -} - -extern void __cond_resched(void); -static inline void cond_resched(void) -{ - if (need_resched()) - __cond_resched(); -} - -#endif /* __KERNEL__ */ -#endif |