Migrate Win32 C/C++ application to Linux on POWER, Part 2: Mutexes

​​

​​

​​​​

This series of articles helps you migrate your Win32 C/C++
applications to Linux on POWER. Senior programmer Nam Keusedo个链接域名ng and pSeries?
Lininclude和including的区别ux technical consultant Chlinux系统安装akarat Skawratananond illustrate how to map Win32
to Lin系统运维工程师ux with respect to mutex application pr系统运维工作内容ogram interfaces (APIs). ​​Part 1​​ of this series focuseinclude和contain的区别d on Win32 API
mapping.

Introduction

This articl色多多荔枝榴莲向日葵e foculinux系统安装seslinux系统安装 on mutex primitives. You are encouraged to review the
following sections in ​​Part 1​​ of this series before continuing:

  • Initialization
  • Process
  • Threads
  • Shalinux操作系统基础知识red memory

Mutexes

A mutex provides exclusive access control for a resource between threads,
as show色的拼音n in ​​Table 1​​ below. It is a simple lock with
only the thread that owns the lock being able to release the mute#includex. It
ensures the integrity of a sha系统运维工资一般多少red rese多多破解版修改教程source that they access (most commonly
shalinux系统安装red data), by asedllowing色的成语 only one thread to access it at a time.

Table 1.
Mutexes

Win32

Linux

CreateMutex(0, FALlinux是什么操作系统SE, 0);

pthread_mutex_init(&muincluded是什么意思tex, NULLlinux常用命令))

CloseHandle(mutex);

pthread_mutex_destroy(&mutex)

Waitse多多破解版修改教程ForSingleObject(mutex, INFINITE))

pthread_mutex_lock(&mutex)

ReleaseMutex(mutex);

pthread_mutex_unlock(&mutex)

​​Back to top​​

Create a mutex

In Win NT/Wilinux是什么操作系统n2K, all mutexes are recursive.

In Win32, CreateMutex()includes provides exclusive access control for
a resource between threadslinux系统 within the current process. This method enableslinux系统安装
threads tolinux操作系统基础知识 seriainclude翻译liinclude读音ze their access to the resources within a process. Once
the mutual exclusionincludestdioh是什么意思 handle is creatlinux常用命令ed, it?’s available to all
threads in the current prlinux命令ocess (see ​​Listing 1​​includestdioh是什么意思 belolinux命令w).

Listing 1. Create a
mutex

HANDLE CreateMutex(
LPSECURITY_ATTRIBUTES lMutexAttributes,
BOOL lInitialOwner,
LPCTSTR lName
)

Linux uses the ptlinux系统hread library call, pthread_mutex_init(), to
create the mutex, as shown in ​​Listing 2​​ below.

Listing 2.
pthread

int pthread_mutex_init(pthread_mutex_t *mutex, const pthread_mutexattr_t *mutexattr);

Linux has three kinds of mutex. Theincluded是什么意思 mutex kind determines what happens if a
thread attempts to lock a mutex it aincluded是什么意思lready owns in a
pthread_include翻译mutex_lock:

Fast mutex:

While trying to lock the mutex using the pthread_mutex_lock(), the calling t#includehread is suspended
foinclude和including的区别rever.
Recursive mutex:

pthread_mutex_lock() immediately returns with a success
return code.
Error check mutex:

pthread_mutex_lock() immediately returns with the error
code EDEADLK.

Thelinux常用命令 mutex kind can be set in two ways.sed ​​Listing 3​​ illustrates a static way osedf setting a mutex.

Listing 3. Static way for
setting a
mutex

/* For Fast mutexes */
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;

/* For recursive mutexes */

You can lock a mutex with the function: pthread_mutex_lo色多多荔枝榴莲向日葵ck(pthread_mutex_t *mutex). This function
gets a pointer to the mutex it is trying to lock.linux系统 The funcincludestion returns
when the mutex is locked, oinclude翻译r if an error occurred. The error is not due to
the lockinclude翻译ed mutex. The function waits u色多多荔枝榴莲向日葵ntil the mutex becomes unlocked.

Another way of settilinux系统安装ng the mutex kind is by using a mutex attribute object.
To do this, pthread_linux删除文件命令mutexattr_init() is called to initialize
the object followed by a pthread_mutexattr_settype(), which
sets the kind of mutex, as shown in ​​Listing 4​​ below.

Listing 4. Sett色调ing a mlinux是什么操作系统utelinux操作系统基础知识x
by
attribute

int pthread_mutexattr_init(pthread_mutexattr_t *attr);
int pthread_mutexattr_settype(pthread_mutexattr_t *attr, int kind);

A mutex is unlo系统运维工作内容ckelinux删除文件命令d with the function (see ​​Listing
5​​):

Here's the sample code for creating a mute色多多荔枝榴莲向日葵x (see Listings ​​6​​​ and ​​included是什么意思7​​ below).

Lisinclude和including的区别ting 5. The unlo色调ck
fuc色多多app下载安装华为市场tion

pthread_mutex_unlock(pthread_mutex_t *mutex))

Listing 6. Win32 sample
code

HANDLE mutex;

mutex = CreateMutex(0, FALSE, 0);
if (!(mutex))
{
return RC_OBJECT_NOT_CREATED;
}

Listing 7. E色达quivalinux重启命令lent Linux
code

pthread_mutexattr_t  attr;
pthread_mutex_t mutex;

pthread_mutexattr_init (&attr);
if (rc = pthread_mutex_init(&mutex, &attr))
{
return RC_OBJECT_NOT_CREATED;
}

​​Back to top​​

Destroying a mutex

In Win32, the Cloinclude翻译seHandlelinux重启命令() method (see ​​Listing 8​​) deletes an objeinclude读音ct to provide an exclusive access
contincludestdioh是什么意思rol for a resour系统运维工资一般多少ce within a current princlude和including的区别ocess. After the deletion of the
objlinuxect, theincludes mutex object is invalid until the CloseHandle() method initializes it again by calling CreateMutex.

Once there is no longer an exclusive access for a resource, you should
destroy it by calling this method. If you need tolinux必学的60个命令 relinquish the ownership
of the object, the ReleaseMut系统/运维ex() method shouldinclude和including的区别 be
called.

The pthread_mutex_destroy() in Linux destr系统运维工资一般多少oys a mutex object,
which frees the resources it might hold. It also checks whether the mutex
is unlocinclude和including的区别ked at that time (see Listing ​​9​​).

Listing 8. Win32 sample
coincluded是什么意思de色的笔顺

if(WaitForSingleObject(mutex, (DWORD)0) == WAIT_TIMEOUT )
return RC_NOT_OWNER;

CloseHandle(mutex);

Listing 9. Linux
code

if (pthread_mutex_destroy(&mutex) == EBUSY)
return RC_NOT_OWNER;

​​Back to top​​

Lockingincludes a mutex

In Win32, the WaitForSingleObjectse短视频5线路线路() (see ​​Listing 10​​) blocks a request for exclusive access to a resource
within the current process. A process ca系统运维工程师n block a request in the following
ways色多多app下载安装华为市场:

  1. If a reqlinuxuest for exclusive access toincludes the resource is unlocked, this
    method locks it.
  2. If the exclusive access to the resource is alre色的成语ady lincludestdioh是什么意思ocked, thislinux系统 mlinux命令ethod
    blocks t色调he calling thread until it is unlocked.

Linux uses a pthread_mutex_lock() (see ​​Listing 11​​).

You can also use the pthread_mutex_tryloclinux删除文件命令k() to test whether a
mutex is lock系统/运维ed without actu#includeally blocking it. If anothseder thread locks the
mutex, the pthread_mutex_trylock will not block. It
immediately returns with the error code EBUSY.

Listing 10.includestdioh是什么意思 Win32 sample
code

if ((rc = WaitForSingleObject(mutex, INFINITE)) == WAIT_FAILED)
return RC_LOCK_ERROR;

Listing 11. Linux
colinux系统de

if (rc = pthread_mutex_lock(&mutex))
return RC_LOCK_ERROR;

​​Back to top​​

Releasing or unlocking a
mutex

Win32 uses ReleaseMutex(linux命令) (see ​​Linclude翻译isting
12​​) to release exclusive access to a resolinux重启命令urce. This call might
fail if the calling thread色多多荔枝榴莲向日葵 does not own the mutex object.

Linux uses pthread_mutex_unlockinclude和contain的区别() toinclude和including的区别 release or unlock the
mutex (see Listing ​​13​​).

Listing 12. Win32 sample
code

If (! ReleaseMutex(mutex))
{
rc = GetLastError();
return RC_UNLOCK_ERROR;
}

Listing 13. Linux
code

if (rc = pthread_mutex_unlock(&mutex))
return RC_UNLOCK_ERROR;

​​Back tosedo个链接域名 top​​

Mutex samplinclude和contain的区别e codes

Here is the Win32 sample code to acquire a mutex within a pr系统运维工程师ocess (see ​​Listing 14​​):

Listing 14.linux命令 Win32 sample
code

#include 
#include
#include

void thrdproc (void *data); //the thread procedure (function) to be executed

HANDLE mutex;

int main( int argc, char **argv )
{
int hThrd;
unsigned stacksize;
HANDLE *threadId1;
HANDLE *threadId2;
int arg1;
DWORD rc;

if( argc < 2 )
arg1 = 7;
else
arg1 = atoi( argv[1] );

printf( "Intra Process Mutex test.\n" );
printf( "Start.\n" );
mutex = CreateMutex(0, FALSE, 0);
if (mutex==NULL)
return RC_OBJECT_NOT_CREATED;

printf( "Mutex created.\n" );

if ((rc = WaitForSingleObject(mutex, INFINITE)) == WAIT_FAILED)
return RC_LOCK_ERROR ;

printf( "Mutex blocked.\n" );


if( stacksize < 8192 )
stacksize = 8192;
else
stacksize = (stacksize/4096+1)*4096;

hThrd = _beginthread( thrdproc, // Definition of a thread entry
NULL,
stacksize,
"Thread 1");

if (hThrd == -1)
return RC_THREAD_NOT_CREATED);

*threadId1 = (HANDLE) hThrd;

hThrd = _beginthread( thrdproc, // Definition of a thread entry
NULL,
stacksize,
Thread 2");

if (hThrd == -1)
return RC_THREAD_NOT_CREATED);

*threadId2 = (HANDLE) hThrd;

printf( "Main thread sleeps 5 sec.\n" );

Sleep( 5*1000 );

if (! ReleaseMutex(mutex))
{
rc = GetLastError();
return RC_UNLOCK_ERROR;
}

printf( "Mutex released.\n" );
printf( "Main thread sleeps %d sec.\n", arg1 );

Sleep( arg1 * 1000 );

if( WaitForSingleObject(mutex, (DWORD)0) == WAIT_TIMEOUT )
return RC_NOT_OWNER;

CloseHandle(mutex);

printf( "Mutex deleted. (%lx)\n", rc );
printf( "Main thread sleeps 5 sec.\n" );

Sleep( 5*1000 );
printf( "Stop.\n" );
return 0;
}

void thread_proc( void *pParam )
{
DWORD rc;

printf( "\t%s created.\n", pParam );
if ((rc = WaitForSingleObject(mutex, INFINITE)) == WAIT_FAILED)
return RC_LOCK_ERROR;

printf( "\tMutex blocked by %s. (%lx)\n", pParam, rc );
printf( "\t%s sleeps for 5 sec.\n", pParam );

Sleep( 5* 1000 );

if (! ReleaseMutex(mutex))
{
rc = GetLastError();
return RC_UNLOCK_ERROR;
}
printf( "\tMutex released by %s. (%lx)\n", pParam, rc );
}

An equivalent Linux sample code to acquire mutex within a process (see ​​Listing 15​​):

Listing 15. Equivalent
Linux sample
cod色多多荔枝榴莲向日葵e

#include 
#include
#include
#include
#include

void thread_proc (void * data);

pthread_mutexattr_t attr;
pthread_mutex_t mutex;

int main( int argc, char **argv )
{
pthread_attr_t pthread_attr;
pthread_attr_t pthread_attr2;
pthread_t threadId1;
pthread_t threadId2;
int arg1;
int rc = 0;

if( argc < 2 )
arg1 = 7;
else
arg1 = atoi( argv[1] );

printf( "Intra Process Mutex test.\n" );
printf( "Start.\n" );
pthread_mutexattr_init( &attr );
if ( rc = pthread_mutex_init( &mutex, NULL))
{
printf( "Mutex NOT created.\n" );
return RC_OBJECT_NOT_CREATED;
}
printf( "Mutex created.\n" );
if (rc = pthread_mutex_lock (&mutex))
{
printf( "Mutex LOCK ERROR.\n" );
return RC_LOCK_ERROR;
}
printf( "Mutex blocked.\n" );

if (rc = pthread_attr_init(&pthread_attr))
{
printf( "pthread_attr_init ERROR.\n" );
return RC_THREAD_ATTR_ERROR;
}

if (rc = pthread_attr_setstacksize(&pthread_attr, 120*1024))
{
printf( "pthread_attr_setstacksize ERROR.\n" );
return RC_STACKSIZE_ERROR;
}

if (rc = pthread_create(&threadId1,
&pthread_attr,
(void*(*)(void*))tinclude什么意思hread_proc,
"Thread 1" ))
{
printf( "pthread_create ERROR.\n" );
return RC_THREAD_NOT_CREATED;
}

if (rc = pthread_attr_init(&pthread_attr2))
{
printf( "pthread_attr_init2 ERROR.\n" );
return RC_THREAD_ATTR_ERROR;
}

if (rc = pthread_attr_setstacksize(&pthread_attr2, 120*1024))
{
printf( "pthread_attr_setstacksize2 ERROR.\n" );
return RC_STACKSIZE_ERROR;
}

if (rc = pthread_create(&threadId2,
&pthread_attr2,
(void*(*)(void*))thread_proc,
"Thread 2" ))
{
printf( "pthread_CREATE ERROR2.\n" );
return RC_THREAD_NOT_CREATED;
}

printf( "Main thread sleeps 5 sec.\n" );
sleep (5);

if (rc = pthread_mutex_unlock(&mutex))
{
printf( "pthread_mutex_unlock ERROR.\n" );
return RC_UNLOCK_ERROR;
}

printf( "Mutex released.\n" );
printf( "Main thread sleeps %d sec.\n", arg1 );
sleep(arg1);

pthread_mutex_destroy(&mutex);

printf( "Main thread sleeps 5 sec.\n" );
sleep( 5 );
printf( "Stop.\n" );
return 0;
}

void thread_proc( void *pParam )
{
int nRet;

printf( "\t%s created.\n", pParam );
if (nRet = pthread_mutex_lock(&mutex))
{
printf( "thread_proc Mutex LOCK ERROR.\n" );
return RC_LOCK_ERROR;
}
printf( "\tMutex blocked by %s. (%lx)\n", pParam, nRet );
printf( "\t%s sleeps for 5 sec.\n", pParam );
sleep(5);
if (nRet = pthread_mutex_unlock(&mutex))
{
printf( " thread_proc :pthread_mutex_unlock ERROR.\n" );
return RC_UNLOCK_ERROR;
}

printf( "\tMutex released by %s. (%lx)\n", pParam, nRet );
}

Here is another Win3sedo个链接域名2 sample code to acq系统运维工资一般多少uire mutex bincluded是什么意思etween proceslinux命令ses.

Mutexes are systemincluded是什么意思-wide objects which multiple processes can see. If
Program A creates a mutex, Program B can see that same mutex. Mutexes have
names, an色多多app下载安装华为市场d only one mutex of a given name can系统运维工作内容 exist on a machincludestdioh是什么意思ine at a
time. If you create a mutex called "My Mutex", no other program can creincludestdioh是什么意思ate
a muinclude的介词tex with that name, as shown in Listings ​​16​​​ and ​​18​​ below.

List系统运维工作内容ing 16. Win32 inter
process mutelinuxx sample code Process
1

#include 
#include

#define WAIT_FOR_ENTER printf( "Press ENTER\n" );getchar()

int main()
{
HANDLE mutex;
DWORD rc;

printf( "Inter Process Mutex test - Process 1.\n" );
printf( "Start.\n" );

SECURITY_ATTRIBUTES sec_attr;

sec_attr.nLength = sizeof( SECURITY_ATTRIBUTES );
sec_attr.lpSecurityDescriptor = NULL;
sec_attr.bInheritHandle = TRUE;

mutex = CreateMutex(&sec_attr, FALSE, "My Mutex");
if( mutex == (HANDLE) NULL )
return RC_OBJECT_NOT_CREATED;

printf( "Mutex created.\n" );

WAIT_FOR_ENTER;

if ( WaitForSingleObject(mutex, INFINITE) == WAIT_FAILED)
return RC_LOCK_ERROR;

printf( "Mutex blocked.\n" );
WAIT_FOR_ENTER;

if( ! ReleaseMutex(mutex) )
{
rc = GetLastError();
return RC_UNLOCK_ERROR;
}

printf( "Mutex released.\n" );

WAIT_FOR_ENTER;

CloseHandle (mutex);

printf( "Mutex deleted.\n" );
printf( "Stop.\n" );

return OK;
}

In here, the System V Interprocess Communicationinclude什么意思s (IPC) functions are used
for Linux imp色的笔顺lementation, as shown in色多多荔枝榴莲向日葵 Lis系统/运维tings ​​17​​​ and ​​19​​.

Listing 17. Equivalent
Linux sample code Process
1

#include 
#include
#include
#include

#define WAIT_FOR_ENTER printf( "Press ENTER\n" );getchar()

union semun {
int val; /* value for SETVAL */
struct semid_ds *buf; /* buffer for IPC_STAT, IPC_SET */
unsigned short *array; /* array for GETALL, SETALL */
struct seminfo __buf; /* buffer for IPC info */
};

main()
{
int shr_sem;
key_t semKey;
struct sembuf semBuf;
int flag;
union semun arg;

printf( "Inter Process Mutex test - Process 1.\n" );
printf( "Start.\n" );

flag = IPC_CREAT;

if( ( semKey = (key_t) atol( "My Mutex" ) ) == 0 )
return RC_INVALID_PARAM;

flag |= S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;

shr_sem = (int) semget( semKey, 1, flag );

if (sinclude什么意思hr_sem < 0)
return RC_OBJECT_NOT_CREATED;

arg.val = 1;
if (semctl(shr_sem, 0, SETVAL, arg) == -1)
return RC_OBJECT_NOT_CREATED;

printf( "Mutex created.\n" );

WAIT_FOR_ENTER;

semBuf.sem_num = 0;
semBuf.sem_op = -1;
semBuf.sem_flg = SEM_UNDO;
if (semop(shr_sem, &semBuf, 1) != 0)
return RC_LOCK_ERROR;

printf( "Mutex blocked.\n" );

WAIT_FOR_ENTER;

semBuf.sem_num = 0;
semBuf.sem_op = 1;
semBuf.sem_flg = SEM_UNDO;

if (semop(shr_sem, &semBuf, 1) != 0)
return RC_UNLOCK_ERROR;

printf( "Mutex released.\n" );

WAIT_FOR_ENTER;

semctl( shr_sem, 0, IPC_RMID );

printf( "Mutex deleted.\n" );
printf( "Stop.\n" );

return 0;

Listing 18. Win32 inter
proc色达ess mutex sample codlinux常用命令e Process
2

#include 
#include


int main()
{
HANDLE mutex;

printf( "Inter Process Mutex test - Process 2.\n" );
printf( "Start.\n" );

SECURITY_ATTRIBUTES sec_attr;

sec_attr.nLength = sizeof( SECURITY_ATTRIBUTES );
sec_attr.lpSecurityDescriptor = NULL;
sec_attr.bInheritHandle = TRUE;

mutex = OpenMutex(MUTEX_ALL_ACCESS, TRUE, ?“My Mutex");
if( mutex == (HANDLE) NULL )
return RC_OBJECT_NOT_CREATED;

printf( "Mutex opened. \n");
printf( "Try to block mutex.\n" );

if ( WaitForSingleObject(mutex, INFINITE) == WAIT_FAILED)
return RC_LOCK_ERROR;

printf( "Mutex blocked. \n" );
printf( "Try to release mutex.\n" );

if( ! ReleaseMutexinclude什么意思(mutex) )
return RC_UNLOCK_ERROR;

printf( "Mutex released.\n" );

CloseHandle (mutex);

printf( "Mutex closed. \n");
printf( "Stop.\n" );

return OK;
}

Listing 19. Equivalent
Linux sampincludestdioh是什么意思le code Process
2

#include 
#include
#include
#include
#include

int main()
{
int mutex;
key_t semKey;
struct sembuf semBuf;
int flag;
int nRet=0;

printf( "Inter Process Mutex test - Process 2.\n" );
printf( "Start.\n" );

flag = 0;

if( ( semKey = (key_t) atol( "My Mutex" ) ) == 0 )
return RC_INVALID_PARAM;

flag |= S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;

mutex = (int) semget( semKey, 1, flag );

if (mutex == -1)
return RC_OBJECT_NOT_CREATED;

printf( "Mutex opened \n");
printf( "Try to block mutex.\n" );

semBuf.sem_num = 0;
semBuf.sem_op = -1;
semBuf.sem_flg = SEM_UNDO;
if (semop(mutex, &semBuf, 1) != 0)
return RC_LOCK_ERROR;

printf( "Mutex blocked. \n");
printf( "Try to release mutex.\n" );

semBuf.sem_num = 0;
semBuf.sem_op = 1;
semBuf.sem_flg = SEM_UNDO;
if (semop(mutex, &semBuf, 1) != 0)
return RC_UNLOCK_ERROR;

printf( "Mutex released. \n");

printf( "Mutex closed. \n");
printf( "Stop.\n" );

return 0;
}

​​Back to tolinux系统p​​

Conclusion

In this article, we covered the mapping of Win32linux系统 to Linux with respect to
mutex APIs. We also referenced lists of mutex sample codes to help you
when you undertake the migration activity involving Win32 to Linux. The
next article in this series will covelinux必学的60个命令r seincluded是什么意思maphores.

Notice updates

IBM C色达orporation 1994-2005. All rights系统运维工作内容 reserse短视频5线路线路ved.

References in this docuinclude翻译ment to IBM products or services do not imply that
IBM ininclude读音tends to色调 make them available in every country.

IBM, eServer, and pSeries are registered trademarks or tradem色的笔顺arkinclude的介词s of the
IBM Corporation in the United Stalinux操作系统基础知识te色的笔顺s or othsedo个链接域名er countries or both.

Microsoft, Windows, Windosedwslinux必学的60个命令 NT, and the Windows logo are tradinclude用法emarks of
Microsoft Corporation in the United States, other countries, or both.

Intel, Intel Inside (logos), MMX, and Pentium are trademarks of Intel
Corporation in the United Stlinux系统安装ates, other countlinux是什么操作系统ri系统/运维es, or both.

UNIX is a registered trademark of The Open Group inlinux系统 the Use短视频5线路线路nited States and
other countries.

Linux islinux常用命令 a trademark of Linus Torvalds in the United States, other
countries, or both.

Other cinclude什么意思ompany,系统运维工作内容 product or service names may be tradelinux重启命令marks or service marks
of others.

Information is provided "AS IS" withinclude用法out warranty of any kind.

All customer examples descrilinux是什么操作系统bed are presented as illustrations of how those
customlinux系统安装ers have used IBM produc色调ts and the results they may have achieved.
Actual environmental costs and performance characteristics may vary blinux是什么操作系统y
customer.

Information concerning non-IBM prodlinux操作系统基础知识ucts was obtained from alinux系统 supplier of
these products, published announclinux系统eminclude的介词ent material, or other publicly
availincludesable sources alinux系统nd does not系统运维工作内容 constitute an elinux是什么操作系统ndorsement of such products
by I色的拼音BM. Sourcelinux系统s for non-IBM list prices and performancinclude的介词e numbers are taken
from publicly available information, including vendor announcements anincludesd
vendor worldinclude读音wide homepages. IBM has not tested tlinuxhese prodsedo个链接域名ucts asedo个链接域名nd caninclude读音not
confiinclude读音rm the accuracy of performance, capability, or any other claimlinux删除文件命令s
related to non-Iinclude什么意思BM products. Questions on the capability of non-IBM
p色的拼音roducts shouldlinux必学的60个命令 be addrelinux常用命令ssed tinclude和including的区别o the supplier of those products.

All statements regarding IBM future direction and intent are subjinclude翻译ect to
change or withdrawal without notice, and represent goals and objectives
only. Contact your lolinux是什么操作系统cal IBM office or IBM authorized reseller for the
full text of the specific Statlinux命令ement of Direction.

Some information addresses anticipated futu色达re capabilities. Such
information is not intended as a definitive statement of a comlinux重启命令mitment to
specific levels of performance, function or delivery schedules with
respect to any future products. Suc色的成语h commitments are only made in IBM
product announcements. The information is pres色调elinux系统安装nted here to communicate
Ilinux是什么操作系统BM's current investment and develo色的笔顺pment activities a系统运维工资一般多少s a good faith effort
to help with our customers' future planning.

Performance is based on melinuxasurements and projections using standard IBM
benchmarks in a controlinux操作系统基础知识lled environment. The actual througinclude的介词hput or
performance that any user will experience will vary dependi系统运维工作内容ng upon
considse短视频5线路线路erations suclinux系统安装h as the amount of mse短视频5线路线路ultiprogramming in the user's job
stream, the I/O configuration, the st色的拼音orage configuration, and the workloadincluded是什么意思
processed. Therefore, no assurance casedo个链接域名n be ginclude读音iven that anincludestdioh是什么意思 individual user
will achieve throughput or performance improvements equivalent to the
ratios stlinux系统ated here.

<script>window._bd_share_config={"common":{"blinux系统dSnsKey":{},"bdText":"","bdMini":"2","bdMiniList":false,"bdPincluded是什么意思ic":"","bdinclude和contain的区别Stinclude用法yle":"0","linux系统安装bdSize":"16"},"share":{}};with(document)0[(getElementsByTagName('head')[0]||body).appendChild(createElement('script')include什么意思).src='http://bdimg.s系统/运维hare.baidu.com/stsedatic/api/js/share.js?v=89860593.js?cdnversion='+~(-new Date()/36e5)];</script>

给主人留下些什么吧!~~
评论热议