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Date: Thu, 30 Jun 2005 01:06:36 -0400
From: Pablo Mora <fbsd.hackers@gmail.com>
To: John Baldwin <jhb@freebsd.org>
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Cc: freebsd-hackers@freebsd.org
Subject: Re: problem handling POSIX thread on FreeBSD
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>Not sure I understand the question.  What do you mean by S.O? =20

, sorry by my badly english, the correct word is O.S (operative system).

>you saying that since the threads are POSIX, that you would >expect
the program to act the same on all Operating Systems?

exactly, that thought before your answer. I thought that a same code
was executed of the same form so much in Solaris, in GNU/Linux and
FreeBSD. At least than had shown the same results.

really I do not know because Linux and solaris they show me:

      hilo1: puntero contiene 0
      hilo2: puntero contiene 0
              hilo1: puntero contiene 0
      hilo2: puntero contiene 3
              hilo1: puntero contiene 2
      hilo2: puntero contiene 6
              hilo1: puntero contiene 4
     hilo2: puntero contiene 9
             hilo1: puntero contiene 6
     hilo2: puntero contiene 12
             hilo1: puntero contiene 8
     hilo2: puntero contiene 15
             hilo1: puntero contiene 10
     hilo2: puntero contiene 18
             hilo1: puntero contiene 12
     hilo2: puntero contiene 21
             hilo1: puntero contiene 14
     hilo2: puntero contiene 24
             hilo1: puntero contiene 16
     finaliza hilo1 con id 1082231728
     hilo2: puntero contiene 27
     finaliza hilo2 con id 1090624432
     fin hilo 2

sadly in my university we work with Solaris:' (
---------------------------------------------------------------------------=
-----------------------

I repeat part of the code:

/* file: test.c */
....
#include<pthread.h>

char buffer[512];
pthread_mutex_t mutex, mutex2;
pthread_t hilo1, hilo2;

void f1(void* ptr)
{
       int i,n=3D10;
       int valor=3D0;
       char*p=3D(char*)ptr;

       for(i=3D0;i<n;i++)
       {
               pthread_mutex_lock(&mutex);
               sscanf(p,"%d",&valor);
               printf("\thilo1: puntero contiene %d\n", valor);
               valor=3Di*3;
               sprintf(p, "%d",valor);

               pthread_mutex_unlock(&mutex2);
       }
       valor=3D(int)pthread_self();
       printf("finaliza hilo1 con id %d\n", valor);
       pthread_exit(&valor);
}
void f2(void* ptr)
{
       int i,n=3D10;
       int valor=3D0;
       char*p=3D(char*)ptr;
       for(i=3D0;i<n;i++)
       {
               pthread_mutex_lock(&mutex2);
               sscanf(p,"%d",&valor);
               printf("hilo2: puntero contiene %d\n", valor);
               valor=3Di*2;

               sprintf(p, "%d",valor);
               pthread_mutex_unlock(&mutex);
       }
       valor=3D(int)pthread_self();
       printf("finaliza hilo2 con id %d\n", valor);
       pthread_exit(&valor);
}


int main()
{
       pthread_attr_t atributos;
   =20
       memset(buffer, '\0', sizeof(buffer));
  =20
       pthread_mutex_init(&mutex, NULL); //linux
       pthread_mutex_init(&mutex2, NULL); //linux

       pthread_mutex_lock(&mutex2);  /* =BF? */

       if(pthread_attr_init(&atributos) < 0)
       {
               perror("pthread_attr_init");
               exit(-1);
       }
               if(pthread_attr_setscope(&atributos,PTHREAD_SCOPE_PROCESS) <=
 0)
       {
               perror("pthread_attr_setscope");
               exit(-2);
       }
if(pthread_create (&hilo1, &atributos, (void*)&f1, (void*)buffer)<0)       =
  =20
       {
             perror("pthread_create hilo1");
              exit(-2);
       }

 if(pthread_create(&hilo2, &atributos, (void*)&f2, (void*)buffer)<0)
       {
              perror("pthread_create hilo2");
              exit(-2);
       }

      .....

}

you believe that a mutex not necessarily must be unlocked by the same
thread that locks it?

sorry but my badly english,  but I am making an effort to me so that
you manage to understand to me.

--=20
Concepci=F3n, Chile.