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Libraries implementing the POSIX Threads standard are often named Pthreads. Pthreads are most commonly used on Unix-like POSIX systems such as Linux and Solaris , but Microsoft Windows implementations also exist. For example, the pthreads-w32 is available and supports a subset of the Pthread API {Link without Title} . (Note: in text, Pthreads is written with an upper-case P.)


CONTENTS

Pthreads defines a set of C programming language types and procedure calls. It is implemented with a pthread.h header and a thread library.

Data types
  • pthread_t: handle to a thread

  • pthread_attr_t: thread attributes


Thread manipulation functions: arguments omitted for brevity.
  • pthread_create(): create a thread

  • pthread_exit(): terminate current thread

  • pthread_cancel(): cancel another thread

  • pthread_join(): block current thread until another one terminiates

  • pthread_attr_init(): initialize thread attributes

  • pthread_attr_setdetachstate():

  • pthread_attr_destroy(): destroy thread attributes


Synchronization functions: for mutexes and condition variables
  • pthread_mutex_init ()

  • pthread_mutex_destroy ()

  • pthread_mutex_lock ()

  • pthread_mutex_trylock ( )

  • pthread_mutex_unlock ()

  • pthread_cond_init()

  • pthread_cond_signal

  • pthread_cond_wait()



EXAMPLE

An example of using Pthreads in C:



#include 

#include 

#include 




    

  • thread_func( void ---vptr_args );

    • 





int main( void ){

  int i, j;

  pthread_t thread;



  pthread_create( &thread, NULL, &thread_func, NULL );



  for( j= 0; j < 20; ++j ){

    fprintf( stdout, "a

" );




    

  •  use some CPU time ---/

    • 
  }






  pthread_join( thread, NULL );



  exit( EXIT_SUCCESS );

}




    

  • thread_func( void ---vptr_args ){

    • 
  int i, j;






  for( j= 0; j < 20; ++j ){

    fprintf( stderr, "  b

" );




    

  •  use some CPU time ---/

    • 
  }




  

  pthread_exit( NULL );

}


This program creates a new thread that prints lines containing 'b', while the main thread prints lines containing 'a'. The output is interleaved between 'a' and 'b' as a result of execution switching between the two threads. More tutorials can be found below in the links section.


REFERENCES



SEE ALSO



EXTERNAL LINKS