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/*****************************************************************************
Copyright (c) 1995, 2009, Innobase Oy. 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 as published by the Free Software
Foundation; version 2 of the License.
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 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/os0thread.h
The interface to the operating system
process and thread control primitives
Created 9/8/1995 Heikki Tuuri
*******************************************************/
#ifndef os0thread_h
#define os0thread_h
#include "univ.i"
/* Maximum number of threads which can be created in the program;
this is also the size of the wait slot array for MySQL threads which
can wait inside InnoDB */
#define OS_THREAD_MAX_N srv_max_n_threads
/* Possible fixed priorities for threads */
#define OS_THREAD_PRIORITY_NONE 100
#define OS_THREAD_PRIORITY_BACKGROUND 1
#define OS_THREAD_PRIORITY_NORMAL 2
#define OS_THREAD_PRIORITY_ABOVE_NORMAL 3
#ifdef __WIN__
typedef void* os_thread_t;
typedef unsigned long os_thread_id_t; /*!< In Windows the thread id
is an unsigned long int */
#else
typedef pthread_t os_thread_t;
typedef os_thread_t os_thread_id_t; /*!< In Unix we use the thread
handle itself as the id of
the thread */
#endif
/* Define a function pointer type to use in a typecast */
typedef void* (*os_posix_f_t) (void*);
/***************************************************************//**
Compares two thread ids for equality.
@return TRUE if equal */
UNIV_INTERN
ibool
os_thread_eq(
/*=========*/
os_thread_id_t a, /*!< in: OS thread or thread id */
os_thread_id_t b); /*!< in: OS thread or thread id */
/****************************************************************//**
Converts an OS thread id to a ulint. It is NOT guaranteed that the ulint is
unique for the thread though!
@return thread identifier as a number */
UNIV_INTERN
ulint
os_thread_pf(
/*=========*/
os_thread_id_t a); /*!< in: OS thread identifier */
/****************************************************************//**
Creates a new thread of execution. The execution starts from
the function given. The start function takes a void* parameter
and returns a ulint.
NOTE: We count the number of threads in os_thread_exit(). A created
thread should always use that to exit and not use return() to exit.
@return handle to the thread */
UNIV_INTERN
os_thread_t
os_thread_create(
/*=============*/
#ifndef __WIN__
os_posix_f_t start_f,
#else
ulint (*start_f)(void*), /*!< in: pointer to function
from which to start */
#endif
void* arg, /*!< in: argument to start
function */
os_thread_id_t* thread_id); /*!< out: id of the created
thread, or NULL */
/*****************************************************************//**
Exits the current thread. */
UNIV_INTERN
void
os_thread_exit(
/*===========*/
void* exit_value); /*!< in: exit value; in Windows this void*
is cast as a DWORD */
/*****************************************************************//**
Returns the thread identifier of current thread.
@return current thread identifier */
UNIV_INTERN
os_thread_id_t
os_thread_get_curr_id(void);
/*========================*/
/*****************************************************************//**
Returns handle to the current thread.
@return current thread handle */
UNIV_INTERN
os_thread_t
os_thread_get_curr(void);
/*====================*/
/*****************************************************************//**
Advises the os to give up remainder of the thread's time slice. */
UNIV_INTERN
void
os_thread_yield(void);
/*=================*/
/*****************************************************************//**
The thread sleeps at least the time given in microseconds. */
UNIV_INTERN
void
os_thread_sleep(
/*============*/
ulint tm); /*!< in: time in microseconds */
/******************************************************************//**
Gets a thread priority.
@return priority */
UNIV_INTERN
ulint
os_thread_get_priority(
/*===================*/
os_thread_t handle);/*!< in: OS handle to the thread */
/******************************************************************//**
Sets a thread priority. */
UNIV_INTERN
void
os_thread_set_priority(
/*===================*/
os_thread_t handle, /*!< in: OS handle to the thread */
ulint pri); /*!< in: priority: one of OS_PRIORITY_... */
/******************************************************************//**
Gets the last operating system error code for the calling thread.
@return last error on Windows, 0 otherwise */
UNIV_INTERN
ulint
os_thread_get_last_error(void);
/*==========================*/
#ifndef UNIV_NONINL
#include "os0thread.ic"
#endif
#endif
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