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/*****************************************************************************
Copyright (c) 1995, 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 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 Street, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file os/os0thread.cc
The interface to the operating system thread control primitives
Created 9/8/1995 Heikki Tuuri
*******************************************************/
#include "os0thread.h"
#ifdef UNIV_NONINL
#include "os0thread.ic"
#endif
#ifdef __WIN__
#include <windows.h>
#endif
#ifndef UNIV_HOTBACKUP
#include "srv0srv.h"
#include "os0sync.h"
/***************************************************************//**
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 */
{
#ifdef __WIN__
if (a == b) {
return(TRUE);
}
return(FALSE);
#else
if (pthread_equal(a, b)) {
return(TRUE);
}
return(FALSE);
#endif
}
/****************************************************************//**
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 */
{
#ifdef UNIV_HPUX10
/* In HP-UX-10.20 a pthread_t is a struct of 3 fields: field1, field2,
field3. We do not know if field1 determines the thread uniquely. */
return((ulint)(a.field1));
#else
return((ulint) a);
#endif
}
/*****************************************************************//**
Returns the thread identifier of current thread. Currently the thread
identifier in Unix is the thread handle itself. Note that in HP-UX
pthread_t is a struct of 3 fields.
@return current thread identifier */
UNIV_INTERN
os_thread_id_t
os_thread_get_curr_id(void)
/*=======================*/
{
#ifdef __WIN__
return(GetCurrentThreadId());
#else
return(pthread_self());
#endif
}
/****************************************************************//**
Creates a new thread of execution. The execution starts from
the function given. The start function takes a void* parameter
and returns an ulint.
@return handle to the thread */
UNIV_INTERN
os_thread_t
os_thread_create_func(
/*==================*/
os_thread_func_t func, /*!< in: pointer to function
from which to start */
void* arg, /*!< in: argument to start
function */
os_thread_id_t* thread_id) /*!< out: id of the created
thread, or NULL */
{
/* the new thread should look recent changes up here so far. */
os_wmb;
#ifdef __WIN__
os_thread_t thread;
DWORD win_thread_id;
os_mutex_enter(os_sync_mutex);
os_thread_count++;
os_mutex_exit(os_sync_mutex);
thread = CreateThread(NULL, /* no security attributes */
0, /* default size stack */
func,
arg,
0, /* thread runs immediately */
&win_thread_id);
if (thread_id) {
*thread_id = win_thread_id;
}
return((os_thread_t)thread);
#else
int ret;
os_thread_t pthread;
pthread_attr_t attr;
#ifndef UNIV_HPUX10
pthread_attr_init(&attr);
#endif
#ifdef UNIV_AIX
/* We must make sure a thread stack is at least 32 kB, otherwise
InnoDB might crash; we do not know if the default stack size on
AIX is always big enough. An empirical test on AIX-4.3 suggested
the size was 96 kB, though. */
ret = pthread_attr_setstacksize(&attr,
(size_t)(PTHREAD_STACK_MIN
+ 32 * 1024));
if (ret) {
fprintf(stderr,
"InnoDB: Error: pthread_attr_setstacksize"
" returned %d\n", ret);
exit(1);
}
#endif
os_mutex_enter(os_sync_mutex);
os_thread_count++;
os_mutex_exit(os_sync_mutex);
#ifdef UNIV_HPUX10
ret = pthread_create(&pthread, pthread_attr_default, func, arg);
#else
ret = pthread_create(&pthread, &attr, func, arg);
#endif
if (ret) {
fprintf(stderr,
"InnoDB: Error: pthread_create returned %d\n", ret);
exit(1);
}
#ifndef UNIV_HPUX10
pthread_attr_destroy(&attr);
#endif
ut_a(os_thread_count <= OS_THREAD_MAX_N);
if (thread_id) {
*thread_id = pthread;
}
return(pthread);
#endif
}
/** Waits until the specified thread completes and joins it.
Its return value is ignored.
@param[in,out] thread thread to join */
UNIV_INTERN
void
os_thread_join(
os_thread_t thread)
{
#ifdef __WIN__
/* Do nothing. */
#else
#ifdef UNIV_DEBUG
const int ret =
#endif /* UNIV_DEBUG */
pthread_join(thread, NULL);
/* Waiting on already-quit threads is allowed. */
ut_ad(ret == 0 || ret == ESRCH);
#endif /* __WIN__ */
}
/*****************************************************************//**
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 */
bool detach) /*!< in: if true, the thread will be detached
right before exiting. If false, another thread
is responsible for joining this thread. */
{
#ifdef UNIV_DEBUG_THREAD_CREATION
fprintf(stderr, "Thread exits, id %lu\n",
os_thread_pf(os_thread_get_curr_id()));
#endif
#ifdef UNIV_PFS_THREAD
pfs_delete_thread();
#endif
os_mutex_enter(os_sync_mutex);
os_thread_count--;
os_mutex_exit(os_sync_mutex);
#ifdef __WIN__
ExitThread((DWORD) exit_value);
#else
if (detach) {
pthread_detach(pthread_self());
}
pthread_exit(exit_value);
#endif
}
/*****************************************************************//**
Advises the os to give up remainder of the thread's time slice. */
UNIV_INTERN
void
os_thread_yield(void)
/*=================*/
{
#if defined(__WIN__)
SwitchToThread();
#elif (defined(HAVE_SCHED_YIELD) && defined(HAVE_SCHED_H))
sched_yield();
#elif defined(HAVE_PTHREAD_YIELD_ZERO_ARG)
pthread_yield();
#elif defined(HAVE_PTHREAD_YIELD_ONE_ARG)
pthread_yield(0);
#else
os_thread_sleep(0);
#endif
}
#endif /* !UNIV_HOTBACKUP */
/*****************************************************************//**
The thread sleeps at least the time given in microseconds. */
UNIV_INTERN
void
os_thread_sleep(
/*============*/
ulint tm) /*!< in: time in microseconds */
{
#ifdef __WIN__
Sleep((DWORD) tm / 1000);
#else
struct timeval t;
t.tv_sec = tm / 1000000;
t.tv_usec = tm % 1000000;
select(0, NULL, NULL, NULL, &t);
#endif
}
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