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/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/

#ifndef _SYNCOP_H
#define _SYNCOP_H

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "xlator.h"
#include <sys/time.h>
#include <pthread.h>
#include <ucontext.h>

#define SYNCENV_PROC_MAX 16
#define SYNCENV_PROC_MIN 2
#define SYNCPROC_IDLE_TIME 600

/*
 * Flags for syncopctx valid elements
 */
#define SYNCOPCTX_UID    0x00000001
#define SYNCOPCTX_GID    0x00000002
#define SYNCOPCTX_GROUPS 0x00000004
#define SYNCOPCTX_PID    0x00000008

struct synctask;
struct syncproc;
struct syncenv;


typedef int (*synctask_cbk_t) (int ret, call_frame_t *frame, void *opaque);

typedef int (*synctask_fn_t) (void *opaque);


typedef enum {
        SYNCTASK_INIT = 0,
        SYNCTASK_RUN,
        SYNCTASK_SUSPEND,
        SYNCTASK_WAIT,
        SYNCTASK_DONE,
	SYNCTASK_ZOMBIE,
} synctask_state_t;

/* for one sequential execution of @syncfn */
struct synctask {
        struct list_head    all_tasks;
        struct syncenv     *env;
        xlator_t           *xl;
        call_frame_t       *frame;
        call_frame_t       *opframe;
        synctask_cbk_t      synccbk;
        synctask_fn_t       syncfn;
        synctask_state_t    state;
        void               *opaque;
        void               *stack;
        int                 woken;
        int                 slept;
        int                 ret;

        uid_t               uid;
        gid_t               gid;

        ucontext_t          ctx;
        struct syncproc    *proc;

        pthread_mutex_t     mutex; /* for synchronous spawning of synctask */
        pthread_cond_t      cond;
        int                 done;

	struct list_head    waitq; /* can wait only "once" at a time */
};


struct syncproc {
        pthread_t           processor;
        ucontext_t          sched;
        struct syncenv     *env;
        struct synctask    *current;
};

/* hosts the scheduler thread and framework for executing synctasks */
struct syncenv {
        struct syncproc     proc[SYNCENV_PROC_MAX];
        int                 procs;

        struct list_head    runq;
        int                 runcount;
        struct list_head    waitq;
        int                 waitcount;

	int                 procmin;
	int                 procmax;

        pthread_mutex_t     mutex;
        pthread_cond_t      cond;

        size_t              stacksize;
};


struct synclock {
	pthread_mutex_t     guard; /* guard the remaining members, pair @cond */
	pthread_cond_t      cond;  /* waiting non-synctasks */
	struct list_head    waitq; /* waiting synctasks */
	gf_boolean_t        lock;  /* _gf_true or _gf_false, lock status */
	struct synctask    *owner; /* NULL if current owner is not a synctask */
};
typedef struct synclock synclock_t;


struct syncbarrier {
	pthread_mutex_t     guard; /* guard the remaining members, pair @cond */
	pthread_cond_t      cond;  /* waiting non-synctasks */
	struct list_head    waitq; /* waiting synctasks */
	int                 count; /* count the number of wakes */
};
typedef struct syncbarrier syncbarrier_t;


struct syncargs {
        int                 op_ret;
        int                 op_errno;
        struct iatt         iatt1;
        struct iatt         iatt2;
        dict_t             *xattr;
        gf_dirent_t        entries;
        struct statvfs     statvfs_buf;
        struct iovec       *vector;
        int                 count;
        struct iobref      *iobref;
        char               *buffer;
        dict_t             *xdata;
	struct gf_flock     flock;

        /* some more _cbk needs */
        uuid_t              uuid;
        char               *errstr;
        dict_t             *dict;
        pthread_mutex_t     lock_dict;

	syncbarrier_t       barrier;

        /* do not touch */
        struct synctask    *task;
        pthread_mutex_t     mutex;
        pthread_cond_t      cond;
	int                 done;
};

struct syncopctx {
        unsigned int valid;  /* valid flags for elements that are set */
        uid_t        uid;
        gid_t        gid;
        int          grpsize;
        int          ngrps;
        gid_t       *groups;
	pid_t        pid;
};

#define __yawn(args) do {                                       \
        args->task = synctask_get ();                           \
        if (args->task)                                         \
            break;                                              \
        pthread_mutex_init (&args->mutex, NULL);                \
        pthread_cond_init (&args->cond, NULL);                  \
        args->done = 0;                                         \
        } while (0)


#define __wake(args) do {                                       \
        if (args->task) {                                       \
                synctask_wake (args->task);                     \
        } else {                                                \
                pthread_mutex_lock (&args->mutex);              \
                {                                               \
                        args->done = 1;				\
                        pthread_cond_signal (&args->cond);      \
                }                                               \
                pthread_mutex_unlock (&args->mutex);            \
        }                                                       \
        } while (0)


#define __yield(args) do {						\
	if (args->task) {				                \
		synctask_yield (args->task);				\
	} else {							\
		pthread_mutex_lock (&args->mutex);			\
		{							\
			while (!args->done)				\
				pthread_cond_wait (&args->cond,		\
						   &args->mutex);	\
		}							\
		pthread_mutex_unlock (&args->mutex);			\
		pthread_mutex_destroy (&args->mutex);			\
		pthread_cond_destroy (&args->cond);			\
	}								\
	} while (0)


#define SYNCOP(subvol, stb, cbk, op, params ...) do {                   \
                struct  synctask        *task = NULL;                   \
                call_frame_t            *frame = NULL;                  \
                                                                        \
                task = synctask_get ();                                 \
                stb->task = task;                                       \
                if (task)                                               \
                        frame = task->opframe;                          \
                else                                                    \
                        frame = syncop_create_frame (THIS);		\
                                                                        \
                if (task) {                                             \
                        frame->root->uid = task->uid;                   \
                        frame->root->gid = task->gid;                   \
                }                                                       \
                                                                        \
                __yawn (stb);                                           \
                                                                        \
                STACK_WIND_COOKIE (frame, cbk, (void *)stb, subvol,     \
                                   op, params);                         \
                                                                        \
                __yield (stb);                                          \
                if (task)                                               \
                        STACK_RESET (frame->root);                      \
                else                                                    \
                        STACK_DESTROY (frame->root);                    \
        } while (0)


#define SYNCENV_DEFAULT_STACKSIZE (2 * 1024 * 1024)

struct syncenv * syncenv_new (size_t stacksize, int procmin, int procmax);
void syncenv_destroy (struct syncenv *);
void syncenv_scale (struct syncenv *env);

int synctask_new (struct syncenv *, synctask_fn_t, synctask_cbk_t, call_frame_t* frame, void *);
struct synctask *synctask_create (struct syncenv *, synctask_fn_t,
				  synctask_cbk_t, call_frame_t *, void *);
int synctask_join (struct synctask *task);
void synctask_wake (struct synctask *task);
void synctask_yield (struct synctask *task);
void synctask_waitfor (struct synctask *task, int count);