os0proc.h

Go to the documentation of this file.

/*****************************************************************************
 
Copyright (c) 1995, 2020, Oracle and/or its affiliates.
 
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.
 
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
 
*****************************************************************************/
 
/** @file include/os0proc.h
 The interface to the operating system
 process control primitives
 
 Created 9/30/1995 Heikki Tuuri
 *******************************************************/
 
#ifndef os0proc_h
#define os0proc_h
 
#include "univ.i"
 
#ifdef UNIV_LINUX
#include <sys/ipc.h>
#include <sys/shm.h>
#endif
 
typedef void *os_process_t;
typedef unsigned long int os_process_id_t;
 
/** The total amount of memory currently allocated from the operating
system with os_mem_alloc_large(). */
extern std::atomic<ulint> os_total_large_mem_allocated;
 
/** Whether to use large pages in the buffer pool */
extern bool os_use_large_pages;
 
/** Large page size. This may be a boot-time option on some platforms */
extern uint os_large_page_size;
 
/** Converts the current process id to a number.
@return process id as a number */
ulint os_proc_get_number(void);
 
/** Allocates large pages memory.
@param[in,out]  n       Number of bytes to allocate
@return allocated memory */
void *os_mem_alloc_large(ulint *n);
 
/** Frees large pages memory.
@param[in]      ptr     pointer returned by os_mem_alloc_large()
@param[in]      size    size returned by os_mem_alloc_large() */
void os_mem_free_large(void *ptr, ulint size);
 
#endif