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demo/kugou/include/Common/include/mysql/my_alloc.h

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+/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License, version 2.0,
+   as published by the Free Software Foundation.
+
+   This program is also distributed with certain software (including
+   but not limited to OpenSSL) that is licensed under separate terms,
+   as designated in a particular file or component or in included license
+   documentation.  The authors of MySQL hereby grant you an additional
+   permission to link the program and your derivative works with the
+   separately licensed software that they have included with MySQL.
+
+   Without limiting anything contained in the foregoing, this file,
+   which is part of C Driver for MySQL (Connector/C), is also subject to the
+   Universal FOSS Exception, version 1.0, a copy of which can be found at
+   http://oss.oracle.com/licenses/universal-foss-exception.
+
+   This program 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 General Public License, version 2.0, for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
+
+/* 
+   Data structures for mysys/my_alloc.c (root memory allocator)
+*/
+
+#ifndef _my_alloc_h
+#define _my_alloc_h
+
+#define ALLOC_MAX_BLOCK_TO_DROP			4096
+#define ALLOC_MAX_BLOCK_USAGE_BEFORE_DROP	10
+
+/* PSI_memory_key */
+#include "mysql/psi/psi_memory.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct st_used_mem
+{				   /* struct for once_alloc (block) */
+  struct st_used_mem *next;	   /* Next block in use */
+  unsigned int	left;		   /* memory left in block  */
+  unsigned int	size;		   /* size of block */
+} USED_MEM;
+
+
+typedef struct st_mem_root
+{
+  USED_MEM *free;                  /* blocks with free memory in it */
+  USED_MEM *used;                  /* blocks almost without free memory */
+  USED_MEM *pre_alloc;             /* preallocated block */
+  /* if block have less memory it will be put in 'used' list */
+  size_t min_malloc;
+  size_t block_size;               /* initial block size */
+  unsigned int block_num;          /* allocated blocks counter */
+  /* 
+     first free block in queue test counter (if it exceed 
+     MAX_BLOCK_USAGE_BEFORE_DROP block will be dropped in 'used' list)
+  */
+  unsigned int first_block_usage;
+
+  /*
+    Maximum amount of memory this mem_root can hold. A value of 0
+    implies there is no limit.
+  */
+  size_t max_capacity;
+
+  /* Allocated size for this mem_root */
+
+  size_t allocated_size;
+
+  /* Enable this for error reporting if capacity is exceeded */
+  my_bool error_for_capacity_exceeded;
+
+  void (*error_handler)(void);
+
+  PSI_memory_key m_psi_key;
+} MEM_ROOT;
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif