Import changeset

1 files changed, 89 insertions, 0 deletions

diff --git a/include/thr_lock.h b/include/thr_lock.h
new file mode 100644
index 00000000000..288a762703d
--- /dev/null
+++ b/include/thr_lock.h
@@ -0,0 +1,89 @@
+/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
+   
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+   
+   This library 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
+   Library General Public License for more details.
+   
+   You should have received a copy of the GNU Library General Public
+   License along with this library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA */
+
+/* For use with thr_lock:s */
+
+#ifndef _thr_lock_h
+#define _thr_lock_h
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#include <my_pthread.h>
+#include <my_list.h>
+
+struct st_thr_lock;
+
+enum thr_lock_type { TL_IGNORE=-1,
+		     TL_UNLOCK, TL_READ,  TL_READ_HIGH_PRIORITY,
+		     TL_READ_NO_INSERT,
+		     TL_WRITE_ALLOW_WRITE, TL_WRITE_ALLOW_READ,
+		     TL_WRITE_CONCURRENT_INSERT,
+		     TL_WRITE_DELAYED, TL_WRITE_LOW_PRIORITY, TL_WRITE,
+		     TL_WRITE_ONLY};
+
+extern ulong max_write_lock_count;
+extern my_bool thr_lock_inited;
+
+typedef struct st_thr_lock_data {
+  pthread_t thread;
+  struct st_thr_lock_data *next,**prev;
+  struct st_thr_lock *lock;
+  pthread_cond_t *cond;
+  enum thr_lock_type type;
+  ulong thread_id;
+  void *status_param;			/* Param to status functions */
+} THR_LOCK_DATA;
+
+struct st_lock_list {
+  THR_LOCK_DATA *data,**last;
+};
+
+typedef struct st_thr_lock {
+  LIST list;
+  pthread_mutex_t mutex;
+  struct st_lock_list read_wait;
+  struct st_lock_list read;
+  struct st_lock_list write_wait;
+  struct st_lock_list write;
+/* write_lock_count is incremented for write locks and reset on read locks */
+  ulong write_lock_count;
+  uint read_no_write_count;
+  void (*get_status)(void*);		/* When one gets a lock */
+  void (*copy_status)(void*,void*);
+  void (*update_status)(void*);		/* Before release of write */
+  my_bool (*check_status)(void *);
+} THR_LOCK;
+
+
+my_bool init_thr_lock(void);		/* Must be called once/thread */
+void thr_lock_init(THR_LOCK *lock);
+void thr_lock_delete(THR_LOCK *lock);
+void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data,
+			void *status_param);
+int thr_lock(THR_LOCK_DATA *data,enum thr_lock_type lock_type);
+void thr_unlock(THR_LOCK_DATA *data);
+int thr_multi_lock(THR_LOCK_DATA **data,uint count);
+void thr_multi_unlock(THR_LOCK_DATA **data,uint count);
+void thr_abort_locks(THR_LOCK *lock);
+void thr_print_locks(void);		/* For debugging */
+my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data);
+my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data);
+#ifdef	__cplusplus
+}
+#endif
+#endif /* _thr_lock_h */