Quelle  jfs_lock.h   Sprache: C

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *   Copyright (C) International Business Machines Corp., 2000-2001
 *   Portions Copyright (C) Christoph Hellwig, 2001-2002
 */
#ifndef _H_JFS_LOCK
#define _H_JFS_LOCK

#include <linux/spinlock.h>
#include <linux/mutex.h>
#include <linux/sched.h>

/*
 * jfs_lock.h
 */

/*
 * Conditional sleep where condition is protected by spinlock
 *
 * lock_cmd and unlock_cmd take and release the spinlock
 */
#define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd) \
do {       \
 DECLARE_WAITQUEUE(__wait, current);  \
       \
 add_wait_queue(&wq, &__wait);   \
 for (;;) {     \
  set_current_state(TASK_UNINTERRUPTIBLE);\
  if (cond)    \
   break;    \
  unlock_cmd;    \
  io_schedule();    \
  lock_cmd;    \
 }      \
 __set_current_state(TASK_RUNNING);   \
 remove_wait_queue(&wq, &__wait);  \
} while (0)

#endif    /* _H_JFS_LOCK */