Example of using the pthread_kill function in Linux to test whether a thread is alive

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In the afternoon, I wrote the pthread_kill function to check whether a thread is still alive.ProgramIn Linux, GCC is compiled.CodePaste it below:

/*******************************Pthread_kill.c*******************************/

 /*  * **************************** Pthread_kill.c ********* *********************  */ 
# Include  <  Stdio. h  >  
# Include  <  Stdlib. h  >  
# Include  <  Pthread. h  >  
# Include  <  Errno. h  >  

 Void     *  Func1 ()  /*  Exit in 1 second  */  
{
Sleep (  1  );
Printf (  "  Thread 1 (ID: 0x % x) exits. \ N  "  , (Unsigned  Int  ) Pthread_self ());
Pthread_exit (( Void     *  )  0  );
}

  Void     *  Func2 ()  /*  Exit in 5 seconds  */  
{
Sleep (  5  );
Printf (  " Thread 2 (ID: 0x % x) exits. \ N  "  , (Unsigned  Int  ) Pthread_self ());
Pthread_exit ((  Void     *  )  0  );
}

  Void  Test_pthread (pthread_t tid)  /*  Pthread_kill return value: Success (0) the thread does not exist (esrch) The signal is invalid (einval)  */ 
{
  Int  Pthread_kill_err;
Pthread_kill_err  =  Pthread_kill (TID,  0  );

  If  (Pthread_kill_err  =  Esrch)
Printf (  "  The thread with the ID 0x % x does not exist or has exited. \ N  "  , (Unsigned  Int ) Tid );
  Else     If  (Pthread_kill_err  =  Einval)
Printf (  "  The sent signal is invalid. \ N  "  );
  Else  
Printf (  "  The thread with the ID 0x % x is still alive. \ N  " , (Unsigned  Int  ) Tid );
}

  Int  Main ()
{
  Int  RET;
Pthread_t tid1, tid2;

Pthread_create (  &  Tid1, null, func1, null );
Pthread_create (  &  Tid2, null, func2, null );

Sleep (  3  );  /* After creating two processes for three seconds, test whether they are still alive.  */  

Test_pthread (tid1 );  /*  Test whether a thread with the ID of tid1 exists  */  
Test_pthread (tid2 );  /*  Test whether a thread with the ID of tid2 exists  */  

Exit (  0  );
} 

End