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/*
Copyright (c) 2010 Gluster, Inc. <http://www.gluster.com>
This file is part of GlusterFS.
GlusterFS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3 of the License,
or (at your option) any later version.
GlusterFS is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#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>
struct synctask;
struct syncenv;
typedef int (*synctask_cbk_t) (int ret, void *opaque);
typedef int (*synctask_fn_t) (void *opaque);
/* for one sequential execution of @syncfn */
struct synctask {
struct list_head all_tasks;
struct syncenv *env;
xlator_t *xl;
synctask_cbk_t synccbk;
synctask_fn_t syncfn;
void *opaque;
void *stack;
int complete;
ucontext_t ctx;
};
/* hosts the scheduler thread and framework for executing synctasks */
struct syncenv {
pthread_t processor;
struct synctask *current;
struct list_head runq;
struct list_head waitq;
pthread_mutex_t mutex;
pthread_cond_t cond;
ucontext_t sched;
size_t stacksize;
};
struct syncargs {
int op_ret;
int op_errno;
struct iatt iatt1;
struct iatt iatt2;
dict_t *xattr;
/* do not touch */
pthread_mutex_t mutex;
char complete;
pthread_cond_t cond;
struct synctask *task;
};
#define __yawn(args) do { \
struct synctask *task = NULL; \
\
task = synctask_get (); \
if (task) { \
args->task = task; \
synctask_yawn (task); \
} else { \
pthread_mutex_init (&args->mutex, NULL); \
pthread_cond_init (&args->cond, NULL); \
} \
} while (0)
#define __yield(args) do { \
if (args->task) { \
synctask_yield (args->task); \
} else { \
pthread_mutex_lock (&args->mutex); \
{ \
while (!args->complete) \
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 __wake(args) do { \
if (args->task) { \
synctask_wake (args->task); \
} else { \
pthread_mutex_lock (&args->mutex); \
{ \
args->complete = 1; \
pthread_cond_broadcast (&args->cond); \
} \
pthread_mutex_unlock (&args->mutex); \
} \
} while (0)
#define SYNCOP(subvol, stb, cbk, op, params ...) do { \
call_frame_t *frame = NULL; \
\
frame = create_frame (THIS, THIS->ctx->pool); \
\
__yawn (stb); \
STACK_WIND_COOKIE (frame, (void *)stb, cbk, subvol, op, params);\
__yield (stb); \
} while (0)
#define SYNCENV_DEFAULT_STACKSIZE (16 * 1024)
struct syncenv * syncenv_new ();
void syncenv_destroy (struct syncenv *);
int synctask_new (struct syncenv *, synctask_fn_t, synctask_cbk_t, void *);
void synctask_zzzz (struct synctask *task);
void synctask_yawn (struct synctask *task);
void synctask_wake (struct synctask *task);
void synctask_yield (struct synctask *task);
int syncop_lookup (xlator_t *subvol, loc_t *loc, dict_t *xattr_req,
/* out */
struct iatt *iatt, dict_t **xattr_rsp, struct iatt *parent);
int syncop_setattr (xlator_t *subvol, loc_t *loc, struct iatt *iatt, int valid,
/* out */
struct iatt *preop, struct iatt *postop);
#endif /* _SYNCOP_H */
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