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/******************************************************
The interface to the operating system
process and thread control primitives
(c) 1995 Innobase Oy
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 ulint 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. */
UNIV_INTERN
ibool
os_thread_eq(
/*=========*/
/* out: TRUE if equal */
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! */
UNIV_INTERN
ulint
os_thread_pf(
/*=========*/
/* out: unsigned long int */
os_thread_id_t a); /* in: thread or thread id */
/********************************************************************
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. */
UNIV_INTERN
os_thread_t
os_thread_create(
/*=============*/
/* out: handle to the thread */
#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. */
UNIV_INTERN
os_thread_id_t
os_thread_get_curr_id(void);
/*========================*/
/*********************************************************************
Returns handle to the current thread. */
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. */
UNIV_INTERN
ulint
os_thread_get_priority(
/*===================*/
/* out: 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. */
UNIV_INTERN
ulint
os_thread_get_last_error(void);
/*==========================*/
#ifndef UNIV_NONINL
#include "os0thread.ic"
#endif
#endif
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