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C/C++ Source or Header  |  2002-04-26  |  3KB  |  116 lines
  1. /* $Id: wait.h,v 1.2 2002/04/26 23:09:17 smilcke Exp $ */
  2.  
  3. #ifndef _LINUX_WAIT_H
  4. #define _LINUX_WAIT_H
  5.  
  6. #define WNOHANG        0x00000001
  7. #define WUNTRACED    0x00000002
  8.  
  9. #define __WCLONE    0x80000000
  10.  
  11. #ifdef __KERNEL__
  12.  
  13. #include <linux/spinlock.h>
  14.  
  15. #include <asm/page.h>
  16.  
  17. /*
  18.  * Temporary debugging help until all code is converted to the new
  19.  * waitqueue usage.
  20.  */
  21.  
  22. struct __wait_queue {
  23.     unsigned int compiler_warning;
  24.     struct task_struct * task;
  25.     void * task_list;
  26. #if WAITQUEUE_DEBUG
  27.     long __magic;
  28.     long __waker;
  29. #endif
  30. };
  31. typedef struct __wait_queue wait_queue_t;
  32.  
  33. /*
  34.  * 'dual' spinlock architecture. Can be switched between spinlock_t and
  35.  * rwlock_t locks via changing this define. Since waitqueues are quite
  36.  * decoupled in the new architecture, lightweight 'simple' spinlocks give
  37.  * us slightly better latencies and smaller waitqueue structure size.
  38.  */
  39. #define USE_RW_WAIT_QUEUE_SPINLOCK 0
  40.  
  41. #if USE_RW_WAIT_QUEUE_SPINLOCK
  42. # define wq_lock_t rwlock_t
  43. # define WAITQUEUE_RW_LOCK_UNLOCKED RW_LOCK_UNLOCKED
  44.  
  45. # define wq_read_lock read_lock
  46. # define wq_read_lock_irqsave read_lock_irqsave
  47. # define wq_read_unlock_irqrestore read_unlock_irqrestore
  48. # define wq_read_unlock read_unlock
  49. # define wq_write_lock_irq write_lock_irq
  50. # define wq_write_lock_irqsave write_lock_irqsave
  51. # define wq_write_unlock_irqrestore write_unlock_irqrestore
  52. # define wq_write_unlock write_unlock
  53. #else
  54. # define wq_lock_t spinlock_t
  55. # define WAITQUEUE_RW_LOCK_UNLOCKED SPIN_LOCK_UNLOCKED
  56.  
  57. # define wq_read_lock spin_lock
  58. # define wq_read_lock_irqsave spin_lock_irqsave
  59. # define wq_read_unlock spin_unlock
  60. # define wq_read_unlock_irqrestore spin_unlock_irqrestore
  61. # define wq_write_lock_irq spin_lock_irq
  62. # define wq_write_lock_irqsave spin_lock_irqsave
  63. # define wq_write_unlock_irqrestore spin_unlock_irqrestore
  64. # define wq_write_unlock spin_unlock
  65. #endif
  66.  
  67. struct __wait_queue_head {
  68.     void * lock;
  69.     void * task_list;
  70. #if WAITQUEUE_DEBUG
  71.     long __magic;
  72.     long __creator;
  73. #endif
  74. };
  75. typedef struct __wait_queue_head wait_queue_head_t;
  76.  
  77. #if WAITQUEUE_DEBUG
  78. # define __WAITQUEUE_DEBUG_INIT(name) \
  79.         , (long)&(name).__magic, 0
  80. # define __WAITQUEUE_HEAD_DEBUG_INIT(name) \
  81.         , (long)&(name).__magic, (long)&(name).__magic
  82. #else
  83. # define __WAITQUEUE_DEBUG_INIT(name)
  84. # define __WAITQUEUE_HEAD_DEBUG_INIT(name)
  85. #endif
  86.  
  87. #define __WAITQUEUE_INITIALIZER(name,task) \
  88.     { 0x1234567, NULL, NULL __WAITQUEUE_DEBUG_INIT(name)}
  89. #define DECLARE_WAITQUEUE(name,task) \
  90.     wait_queue_t name = __WAITQUEUE_INITIALIZER(name,task)
  91.  
  92. #define __WAIT_QUEUE_HEAD_INITIALIZER(name) \
  93. { WAITQUEUE_RW_LOCK_UNLOCKED, { &(name).task_list, &(name).task_list } \
  94.         __WAITQUEUE_HEAD_DEBUG_INIT(name)}
  95.  
  96. #define DECLARE_WAIT_QUEUE_HEAD(name) \
  97.     wait_queue_head_t name = __WAIT_QUEUE_HEAD_INITIALIZER(name)
  98.  
  99. void init_waitqueue_head(wait_queue_head_t *q);
  100.  
  101. void init_waitqueue_entry(wait_queue_t *q, struct task_struct *p);
  102.  
  103. int waitqueue_active(wait_queue_head_t *q);
  104.  
  105. void __add_wait_queue(wait_queue_head_t *head, wait_queue_t *neww);
  106.  
  107. /*
  108.  * Used for wake-one threads:
  109.  */
  110. void __add_wait_queue_tail(wait_queue_head_t *head, wait_queue_t *neww);
  111. void __remove_wait_queue(wait_queue_head_t *head, wait_queue_t *old);
  112.  
  113. #endif /* __KERNEL__ */
  114.  
  115. #endif
  116.