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include/thr_lock.h
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
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/* For use with thr_locks */
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#ifndef DRIZZLED_THR_LOCK_H
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#define DRIZZLED_THR_LOCK_H
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#include <boost/thread/mutex.hpp>
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#include <boost/thread/condition_variable.hpp>
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#include <pthread.h>
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namespace drizzled
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{
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extern uint64_t max_write_lock_count;
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extern uint64_t table_lock_wait_timeout;
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/* For use with thr_lock:s */
 
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#ifndef _thr_lock_h
 
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#define _thr_lock_h
 
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#ifdef  __cplusplus
 
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extern "C" {
 
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#endif
 
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#include <my_pthread.h>
 
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#include <my_list.h>
 
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struct st_thr_lock;
 
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extern ulong locks_immediate,locks_waited ;
 
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extern pthread_mutex_t THR_LOCK_lock;
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enum thr_lock_type { TL_IGNORE=-1,
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                     /* UNLOCK ANY LOCK */
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                     TL_UNLOCK,
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                     /* Read lock */
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                     TL_READ,
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                     TL_READ_WITH_SHARED_LOCKS,
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                     /* READ, Don't allow concurrent insert */
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                     TL_READ_NO_INSERT,
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                     /*
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                       Write lock, but allow other threads to read / write.
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                       Used by BDB tables in MySQL to mark that someone is
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                       reading/writing to the table.
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                     */
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                     TL_WRITE_ALLOW_WRITE,
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                     /*
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                       Write lock, but allow other threads to read.
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                       Used by ALTER TABLE in MySQL to allow readers
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                       to use the table until ALTER TABLE is finished.
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                     */
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                     TL_WRITE_ALLOW_READ,
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                     /*
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                       WRITE lock used by concurrent insert. Will allow
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                       READ, if one could use concurrent insert on table.
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                     */
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                     TL_WRITE_CONCURRENT_INSERT,
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                     /*
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                       parser only! Late bound low_priority flag.
 
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                     TL_UNLOCK,                 /* UNLOCK ANY LOCK */
 
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                     TL_READ,                   /* Read lock */
 
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                     TL_READ_WITH_SHARED_LOCKS,
 
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                     /* High prior. than TL_WRITE. Allow concurrent insert */
 
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                     TL_READ_HIGH_PRIORITY,
 
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                     /* READ, Don't allow concurrent insert */
 
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                     TL_READ_NO_INSERT,
 
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                     /* 
 
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                        Write lock, but allow other threads to read / write.
 
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                        Used by BDB tables in MySQL to mark that someone is
 
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                        reading/writing to the table.
 
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                      */
 
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                     TL_WRITE_ALLOW_WRITE,
 
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                     /*
 
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                        Write lock, but allow other threads to read.
 
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                        Used by ALTER TABLE in MySQL to allow readers
 
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                        to use the table until ALTER TABLE is finished.
 
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                     */
 
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                     TL_WRITE_ALLOW_READ,
 
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                     /*
 
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                       WRITE lock used by concurrent insert. Will allow
 
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                       READ, if one could use concurrent insert on table.
 
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                     */
 
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                     TL_WRITE_CONCURRENT_INSERT,
 
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                     /* Write used by INSERT DELAYED.  Allows READ locks */
 
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                     TL_WRITE_DELAYED,
 
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                     /* 
 
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                       parser only! Late bound low_priority flag. 
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                       At open_tables() becomes thd->update_lock_default.
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                     */
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                     TL_WRITE_DEFAULT,
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                     /* Normal WRITE lock */
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                     TL_WRITE,
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                     /* Abort new lock request with an error */
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                     TL_WRITE_ONLY};
 
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                     /* WRITE lock that has lower priority than TL_READ */
 
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                     TL_WRITE_LOW_PRIORITY,
 
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                     /* Normal WRITE lock */
 
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                     TL_WRITE,
 
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                     /* Abort new lock request with an error */
 
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                     TL_WRITE_ONLY};
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enum enum_thr_lock_result { THR_LOCK_SUCCESS= 0, THR_LOCK_ABORTED= 1,
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                            THR_LOCK_WAIT_TIMEOUT= 2, THR_LOCK_DEADLOCK= 3 };
 
72
 
 
73
 
 
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extern ulong max_write_lock_count;
 
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extern ulong table_lock_wait_timeout;
 
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extern my_bool thr_lock_inited;
 
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extern enum thr_lock_type thr_upgraded_concurrent_insert_lock;
 
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/*
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  A description of the thread which owns the lock. The address
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  of an instance of this structure is used to uniquely identify the thread.
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*/
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struct THR_LOCK_INFO
 
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typedef struct st_thr_lock_info
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{
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  pthread_t thread;
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  uint64_t thread_id;
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  uint32_t n_cursors;
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80
 
  THR_LOCK_INFO() : 
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    thread(0),
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    thread_id(0),
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    n_cursors(0)
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  { }
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86
 
  void init();
87
 
 
88
 
};
 
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  my_thread_id thread_id;
 
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  ulong n_cursors;
 
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} THR_LOCK_INFO;
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/*
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  Lock owner identifier. Globally identifies the lock owner within the
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  structure is used as id.
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*/
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struct THR_LOCK_OWNER
 
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typedef struct st_thr_lock_owner
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{
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  THR_LOCK_INFO *info;
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  THR_LOCK_OWNER() :
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    info(0)
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  { }
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};
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struct THR_LOCK;
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struct THR_LOCK_DATA;
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struct THR_LOCK_DATA {
 
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} THR_LOCK_OWNER;
 
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typedef struct st_thr_lock_data {
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  THR_LOCK_OWNER *owner;
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  struct THR_LOCK_DATA *next,**prev;
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  struct THR_LOCK *lock;
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  boost::condition_variable *cond;
 
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  struct st_thr_lock_data *next,**prev;
 
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  struct st_thr_lock *lock;
 
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  pthread_cond_t *cond;
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  enum thr_lock_type type;
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  void *status_param;                   /* Param to status functions */
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  THR_LOCK_DATA() :
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    owner(0),
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    next(0),
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    prev(0),
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    lock(0),
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    cond(0),
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    type(TL_UNLOCK),
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    status_param(0)
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  { }
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  void init(THR_LOCK *lock,
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            void *status_param= NULL);
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};
 
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  void *debug_print_param;
 
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} THR_LOCK_DATA;
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struct st_lock_list {
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  THR_LOCK_DATA *data,**last;
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  st_lock_list() :
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    data(0),
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    last(0)
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  { }
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};
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struct THR_LOCK {
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private:
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  boost::mutex mutex;
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public:
 
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typedef struct st_thr_lock {
 
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  LIST list;
 
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  pthread_mutex_t mutex;
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  struct st_lock_list read_wait;
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  struct st_lock_list read;
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  struct st_lock_list write_wait;
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  struct st_lock_list write;
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  /* write_lock_count is incremented for write locks and reset on read locks */
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  uint32_t write_lock_count;
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  uint32_t read_no_write_count;
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  THR_LOCK() :
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    write_lock_count(0),
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    read_no_write_count(0)
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  { }
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  ~THR_LOCK()
158
 
  { }
159
 
 
160
 
  void abort_locks();
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  bool abort_locks_for_thread(uint64_t thread);
162
 
 
163
 
  void lock()
164
 
  {
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    mutex.lock();
166
 
  }
167
 
 
168
 
  void unlock()
169
 
  {
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    mutex.unlock();
171
 
  }
172
 
 
173
 
  void init()
174
 
  {
175
 
  }
176
 
 
177
 
  void deinit()
178
 
  {
179
 
  }
180
 
 
181
 
  boost::mutex *native_handle()
182
 
  {
183
 
    return &mutex;
184
 
  }
185
 
};
186
 
 
187
 
 
 
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  ulong write_lock_count;
 
126
  uint read_no_write_count;
 
127
  void (*get_status)(void*, int);       /* When one gets a lock */
 
128
  void (*copy_status)(void*,void*);
 
129
  void (*update_status)(void*);         /* Before release of write */
 
130
  void (*restore_status)(void*);         /* Before release of read */
 
131
  my_bool (*check_status)(void *);
 
132
} THR_LOCK;
 
133
 
 
134
 
 
135
extern LIST *thr_lock_thread_list;
 
136
 
 
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my_bool init_thr_lock(void);            /* Must be called once/thread */
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#define thr_lock_owner_init(owner, info_arg) (owner)->info= (info_arg)
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void thr_lock_info_init(THR_LOCK_INFO *info);
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void thr_lock_init(THR_LOCK *lock);
 
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void thr_lock_delete(THR_LOCK *lock);
 
142
void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data,
 
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                        void *status_param);
 
144
enum enum_thr_lock_result thr_lock(THR_LOCK_DATA *data,
 
145
                                   THR_LOCK_OWNER *owner,
 
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                                   enum thr_lock_type lock_type);
 
147
void thr_unlock(THR_LOCK_DATA *data);
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enum enum_thr_lock_result thr_multi_lock(THR_LOCK_DATA **data,
192
 
                                         uint32_t count, THR_LOCK_OWNER *owner);
193
 
void thr_multi_unlock(THR_LOCK_DATA **data,uint32_t count);
194
 
 
195
 
} /* namespace drizzled */
196
 
 
197
 
#endif /* DRIZZLED_THR_LOCK_H */
 
149
                                         uint count, THR_LOCK_OWNER *owner);
 
150
void thr_multi_unlock(THR_LOCK_DATA **data,uint count);
 
151
void thr_abort_locks(THR_LOCK *lock, my_bool upgrade_lock);
 
152
my_bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread);
 
153
void thr_print_locks(void);             /* For debugging */
 
154
my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data);
 
155
void    thr_downgrade_write_lock(THR_LOCK_DATA *data,
 
156
                                 enum thr_lock_type new_lock_type);
 
157
my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data);
 
158
#ifdef  __cplusplus
 
159
}
 
160
#endif
 
161
#endif /* _thr_lock_h */