sched.h
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上传日期:2013-04-10
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文件大小:7k
- /*
- * linux/include/linux/sunrpc/sched.h
- *
- * Scheduling primitives for kernel Sun RPC.
- *
- * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
- */
- #ifndef _LINUX_SUNRPC_SCHED_H_
- #define _LINUX_SUNRPC_SCHED_H_
- #include <linux/timer.h>
- #include <linux/tqueue.h>
- #include <linux/sunrpc/types.h>
- #include <linux/wait.h>
- /*
- * Define this if you want to test the fast scheduler for async calls.
- * This is still experimental and may not work.
- */
- #undef CONFIG_RPC_FASTSCHED
- /*
- * This is the actual RPC procedure call info.
- */
- struct rpc_message {
- __u32 rpc_proc; /* Procedure number */
- void * rpc_argp; /* Arguments */
- void * rpc_resp; /* Result */
- struct rpc_cred * rpc_cred; /* Credentials */
- };
- /*
- * This is the RPC task struct
- */
- struct rpc_task {
- struct list_head tk_list; /* wait queue links */
- #ifdef RPC_DEBUG
- unsigned long tk_magic; /* 0xf00baa */
- #endif
- struct list_head tk_task; /* global list of tasks */
- struct rpc_clnt * tk_client; /* RPC client */
- struct rpc_rqst * tk_rqstp; /* RPC request */
- int tk_status; /* result of last operation */
- struct rpc_wait_queue * tk_rpcwait; /* RPC wait queue we're on */
- /*
- * RPC call state
- */
- struct rpc_message tk_msg; /* RPC call info */
- __u32 * tk_buffer; /* XDR buffer */
- __u8 tk_garb_retry,
- tk_cred_retry,
- tk_suid_retry;
- /*
- * timeout_fn to be executed by timer bottom half
- * callback to be executed after waking up
- * action next procedure for async tasks
- * exit exit async task and report to caller
- */
- void (*tk_timeout_fn)(struct rpc_task *);
- void (*tk_callback)(struct rpc_task *);
- void (*tk_action)(struct rpc_task *);
- void (*tk_exit)(struct rpc_task *);
- void (*tk_release)(struct rpc_task *);
- void * tk_calldata;
- /*
- * tk_timer is used for async processing by the RPC scheduling
- * primitives. You should not access this directly unless
- * you have a pathological interest in kernel oopses.
- */
- struct timer_list tk_timer; /* kernel timer */
- wait_queue_head_t tk_wait; /* sync: sleep on this q */
- unsigned long tk_timeout; /* timeout for rpc_sleep() */
- unsigned short tk_flags; /* misc flags */
- unsigned char tk_active : 1;/* Task has been activated */
- unsigned long tk_runstate; /* Task run status */
- #ifdef RPC_DEBUG
- unsigned short tk_pid; /* debugging aid */
- #endif
- };
- #define tk_auth tk_client->cl_auth
- #define tk_xprt tk_client->cl_xprt
- /* support walking a list of tasks on a wait queue */
- #define task_for_each(task, pos, head)
- list_for_each(pos, head)
- if ((task=list_entry(pos, struct rpc_task, tk_list)),1)
- #define task_for_first(task, head)
- if (!list_empty(head) &&
- ((task=list_entry((head)->next, struct rpc_task, tk_list)),1))
- /* .. and walking list of all tasks */
- #define alltask_for_each(task, pos, head)
- list_for_each(pos, head)
- if ((task=list_entry(pos, struct rpc_task, tk_task)),1)
- typedef void (*rpc_action)(struct rpc_task *);
- /*
- * RPC task flags
- */
- #define RPC_TASK_ASYNC 0x0001 /* is an async task */
- #define RPC_TASK_SWAPPER 0x0002 /* is swapping in/out */
- #define RPC_TASK_SETUID 0x0004 /* is setuid process */
- #define RPC_TASK_CHILD 0x0008 /* is child of other task */
- #define RPC_CALL_REALUID 0x0010 /* try using real uid */
- #define RPC_CALL_MAJORSEEN 0x0020 /* major timeout seen */
- #define RPC_TASK_ROOTCREDS 0x0040 /* force root creds */
- #define RPC_TASK_DYNAMIC 0x0080 /* task was kmalloc'ed */
- #define RPC_TASK_KILLED 0x0100 /* task was killed */
- #define RPC_IS_ASYNC(t) ((t)->tk_flags & RPC_TASK_ASYNC)
- #define RPC_IS_SETUID(t) ((t)->tk_flags & RPC_TASK_SETUID)
- #define RPC_IS_CHILD(t) ((t)->tk_flags & RPC_TASK_CHILD)
- #define RPC_IS_SWAPPER(t) ((t)->tk_flags & RPC_TASK_SWAPPER)
- #define RPC_DO_ROOTOVERRIDE(t) ((t)->tk_flags & RPC_TASK_ROOTCREDS)
- #define RPC_ASSASSINATED(t) ((t)->tk_flags & RPC_TASK_KILLED)
- #define RPC_IS_ACTIVATED(t) ((t)->tk_active)
- #define RPC_DO_CALLBACK(t) ((t)->tk_callback != NULL)
- #define RPC_TASK_SLEEPING 0
- #define RPC_TASK_RUNNING 1
- #define RPC_IS_SLEEPING(t) (test_bit(RPC_TASK_SLEEPING, &(t)->tk_runstate))
- #define RPC_IS_RUNNING(t) (test_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
- #define rpc_set_running(t) (set_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
- #define rpc_clear_running(t) (clear_bit(RPC_TASK_RUNNING, &(t)->tk_runstate))
- #define rpc_set_sleeping(t) (set_bit(RPC_TASK_SLEEPING, &(t)->tk_runstate))
- #define rpc_clear_sleeping(t)
- do {
- smp_mb__before_clear_bit();
- clear_bit(RPC_TASK_SLEEPING, &(t)->tk_runstate);
- smp_mb__after_clear_bit();
- } while(0)
- /*
- * RPC synchronization objects
- */
- struct rpc_wait_queue {
- struct list_head tasks;
- #ifdef RPC_DEBUG
- char * name;
- #endif
- };
- #ifndef RPC_DEBUG
- # define RPC_WAITQ_INIT(var,qname) ((struct rpc_wait_queue) {LIST_HEAD_INIT(var)})
- # define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var.tasks,qname)
- # define INIT_RPC_WAITQ(ptr,qname) do {
- INIT_LIST_HEAD(&(ptr)->tasks);
- } while(0)
- #else
- # define RPC_WAITQ_INIT(var,qname) ((struct rpc_wait_queue) {LIST_HEAD_INIT(var.tasks), qname})
- # define RPC_WAITQ(var,qname) struct rpc_wait_queue var = RPC_WAITQ_INIT(var,qname)
- # define INIT_RPC_WAITQ(ptr,qname) do {
- INIT_LIST_HEAD(&(ptr)->tasks); (ptr)->name = qname;
- } while(0)
- #endif
- /*
- * Function prototypes
- */
- struct rpc_task *rpc_new_task(struct rpc_clnt *, rpc_action, int flags);
- struct rpc_task *rpc_new_child(struct rpc_clnt *, struct rpc_task *parent);
- void rpc_init_task(struct rpc_task *, struct rpc_clnt *,
- rpc_action exitfunc, int flags);
- void rpc_release_task(struct rpc_task *);
- void rpc_killall_tasks(struct rpc_clnt *);
- int rpc_execute(struct rpc_task *);
- void rpc_run_child(struct rpc_task *parent, struct rpc_task *child,
- rpc_action action);
- int rpc_add_wait_queue(struct rpc_wait_queue *, struct rpc_task *);
- void rpc_remove_wait_queue(struct rpc_task *);
- void rpc_sleep_on(struct rpc_wait_queue *, struct rpc_task *,
- rpc_action action, rpc_action timer);
- void rpc_add_timer(struct rpc_task *, rpc_action);
- void rpc_wake_up_task(struct rpc_task *);
- void rpc_wake_up(struct rpc_wait_queue *);
- struct rpc_task *rpc_wake_up_next(struct rpc_wait_queue *);
- void rpc_wake_up_status(struct rpc_wait_queue *, int);
- void rpc_delay(struct rpc_task *, unsigned long);
- void * rpc_allocate(unsigned int flags, unsigned int);
- void rpc_free(void *);
- int rpciod_up(void);
- void rpciod_down(void);
- void rpciod_wake_up(void);
- #ifdef RPC_DEBUG
- void rpc_show_tasks(void);
- #endif
- static __inline__ void *
- rpc_malloc(struct rpc_task *task, unsigned int size)
- {
- return rpc_allocate(task->tk_flags, size);
- }
- static __inline__ void
- rpc_exit(struct rpc_task *task, int status)
- {
- task->tk_status = status;
- task->tk_action = NULL;
- }
- #ifdef RPC_DEBUG
- static __inline__ char *
- rpc_qname(struct rpc_wait_queue *q)
- {
- return q->name? q->name : "unknown";
- }
- #endif
- #endif /* _LINUX_SUNRPC_SCHED_H_ */