jfs_lock.h 1.5 KB

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  1. /*
  2. * Copyright (C) International Business Machines Corp., 2000-2001
  3. * Portions Copyright (C) Christoph Hellwig, 2001-2002
  4. *
  5. * This program is free software; you can redistribute it and/or modify
  6. * it under the terms of the GNU General Public License as published by
  7. * the Free Software Foundation; either version 2 of the License, or
  8. * (at your option) any later version.
  9. *
  10. * This program is distributed in the hope that it will be useful,
  11. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
  13. * the GNU General Public License for more details.
  14. *
  15. * You should have received a copy of the GNU General Public License
  16. * along with this program; if not, write to the Free Software
  17. * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18. */
  19. #ifndef _H_JFS_LOCK
  20. #define _H_JFS_LOCK
  21. #include <linux/spinlock.h>
  22. #include <linux/mutex.h>
  23. #include <linux/sched.h>
  24. /*
  25. * jfs_lock.h
  26. */
  27. /*
  28. * Conditional sleep where condition is protected by spinlock
  29. *
  30. * lock_cmd and unlock_cmd take and release the spinlock
  31. */
  32. #define __SLEEP_COND(wq, cond, lock_cmd, unlock_cmd) \
  33. do { \
  34. DECLARE_WAITQUEUE(__wait, current); \
  35. \
  36. add_wait_queue(&wq, &__wait); \
  37. for (;;) { \
  38. set_current_state(TASK_UNINTERRUPTIBLE);\
  39. if (cond) \
  40. break; \
  41. unlock_cmd; \
  42. io_schedule(); \
  43. lock_cmd; \
  44. } \
  45. current->state = TASK_RUNNING; \
  46. remove_wait_queue(&wq, &__wait); \
  47. } while (0)
  48. #endif /* _H_JFS_LOCK */