pthread——pthread_cleanup

Pthread_cleanup用于注册线程清理函数，注册的清理函数将在线程被取消或者主动调用pthread_exit时被调用；

  

一个简单的示例：

#include <pthread.h>

#include <stdio.h>

 

 

// pthread_cleanup_push and pthread_cleanup_pop should be called in pairs at the same lexical nesting level

// they are implemented with '{' '}'

 

// pthread_cleanup_pop with non-zero argument/pthread_cancel/pthread_exit

// will cause the remained handler to be popped and executed

 

#define ERROR printf("error @ %s line %d\n", __FILE__, __LINE__ );

 

void thread_cleanup( void *arg )

{

// __func__ can be used instead

printf("%s is called\n", __FUNCTION__ );

}

 

void* threadfn( void *data )

{

pthread_cleanup_push( thread_cleanup, NULL );

 

// sleep是一个可以执行线程取消的函数，称为取消点【see man 7 pthreads】；

sleep( 20 );

 

pthread_cleanup_pop( 1 );

}

 

int main(int argc, char const *argv[])

{

pthread_t thread;

 

if ( pthread_create( &thread, NULL, threadfn, NULL) )

{

ERROR;

return -1;

}

 

sleep( 1 );

 

// cancel the thread before it exits

if( pthread_cancel( thread ) )

{

ERROR;

return -1;

}

 

// wait for thread to complete it's cleanup

if( pthread_join( thread, NULL ) )

{

ERROR;

return -1;

}

 

printf("Done!\n");

 

return 0;

}