/*

************************************************************************

* Filename: n_trylock.c

* Description:

* Version: 1.0

* Created: 2011骞?4鏈?2鏃?20鏃?9鍒?2绉?

* Revision: none

* Compiler: gcc

* Author: wenhao (wh), hnrain1004@gmail.com

* Company: sunplusapp

* ***********************************************************************

*/

#include

<

stdio.h

>

#include

<

pthread.h

>

#include

<

errno.h

>

pthread_mutex_t mutex;

void

*

thread_a(

void

*

arg)

{

printf(

"

thread a enter\n

"

);

pthread_mutex_lock(

&

mutex);

printf(

"

mutex a lock\n

"

);

sleep(

6

);

pthread_mutex_unlock(

&

mutex);

printf(

"

mutex a unlock\n

"

);

}

void

*

thread_b(

void

*

arg)

{

printf(

"

thread b enter\n

"

);

#if

1

pthread_mutex_trylock(

&

mutex);

#else

while

(pthread_mutex_trylock(

&

mutex)

==

EBUSY)

{

printf(

"

pthread b trylock\n

"

);

sleep(

1

);

}

#endif

printf(

"

mutex b lock\n

"

);

pthread_mutex_unlock(

&

mutex);

printf(

"

mutex b unlock\n

"

);

}

int

main(

int

argc,

char

**

argv)

{

pthread_t tid_a,tid_b;

int

err;

if

(pthread_mutex_init(

&

mutex,NULL)

!=

0

)

{

perror(

"

pthread_mutex_init

"

);

}

err

=

pthread_create(

&

tid_a,NULL,thread_a,NULL);

if

(err

!=

0

)

{

perror(

"

pthread_create thread_a

"

);

}

sleep(

1

);

err

=

pthread_create(

&

tid_b,NULL,thread_b,NULL);

if

(err

<

0

)

{

perror(

"

pthread_create thread_b

"

);

}

sleep(

10

);

printf(

"

the main close\n

"

);

return

0

;

}