#include <pthread.h>

#include <stdio.h>

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

// they are implemented with ‘{‘ ‘}‘

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

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

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

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void thread_cleanup( void *arg )

{

// __func__ can be used instead

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

}

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void* threadfn( void *data )

{

pthread_cleanup_push( thread_cleanup, NULL );

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// 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 );

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pthread_cleanup_pop( 1 );

}

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

{

pthread_t thread;

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

{

ERROR;

return -1;

}

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sleep( 1 );

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// cancel the thread before it exits

if( pthread_cancel( thread ) )

{

ERROR;

return -1;

}

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// wait for thread to complete it‘s cleanup

if( pthread_join( thread, NULL ) )

{

ERROR;

return -1;

}

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printf("Done!\n");

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return 0;

}