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1995-04-22
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*** /tmp/,RCSt1a00896 Wed Nov 28 09:31:16 1990
--- PatchLevel.h Wed Nov 28 09:30:44 1990
***************
*** 1,5 ****
/*
! * PathLevel: 1
*
* the Patch Level above is to identify the version
* of the all the files in this directory. given the above
--- 1,5 ----
/*
! * PathLevel: 2
*
* the Patch Level above is to identify the version
* of the all the files in this directory. given the above
*** /tmp/,RCSt1a00896 Wed Nov 28 09:31:18 1990
--- phil.c Wed Nov 28 09:30:45 1990
***************
*** 44,66 ****
{"phil-4", (char *)NULL, 0x010, 4, 3, 0, 64, 0L, 0L, 0L, 0L, 0 }
};
! /* forks: number of forks available to philosopher i
* note: mutex access at all times (ie only one process may read/write
! * any element of forks at one time, implemented via semaphore).
* usage:
! * at any time forks[i] can only be 0, 1, or 2
! * when a philosopher [i] wants to eat, forks[i] must be 2,
* if it is
! * decrement forks to the right and left by one and start eating
* otherwise
! * wait for event phil[i].event (ready condition for phil i) to occur.
*
! * when a philosopher is done eating,
! * increments forks to left and right
! * if forks[left] == 2 cause event phil[left].event
! * if forks[right] == 2 cause event phil[right].event
*/
! int forks [] = { 2, 2, 2, 2, 2 };
/* fork semaphore (queue) */
char *forkSemaphore;
--- 44,65 ----
{"phil-4", (char *)NULL, 0x010, 4, 3, 0, 64, 0L, 0L, 0L, 0L, 0 }
};
! /* forks: number of forks (according to the number of philosophers
* note: mutex access at all times (ie only one process may read/write
! * one fork at one time, implemented via semaphore).
* usage:
! * at any time forks[i] can only be 0 or 1
! * when a philosopher [i] wants to eat, forks[i] and forks[(i+1)%5]
! * must be 1
* if it is
! * decrement this two forks by one and start eating
* otherwise
! * wait for event phil[i].event (ready condition for phil i) to occur
! * and check again
*
! * when a philosopher has done eating he puts back his two forks
*/
! int forks [] = { 1, 1, 1, 1, 1 };
/* fork semaphore (queue) */
char *forkSemaphore;
***************
*** 87,102 ****
PHIL *phil; /* philosopher requesting forks */
{
Pfork(phil->message); /* mutually exclusive access to forks */
! if(forks[phil->me] != 2)
! {
Vfork(phil->message); /* release */
phil->eventbuf = phil->event;
e_wait(&phil->eventbuf, 0, 0L); /* wait for ready condition */
Pfork(phil->message);
! }
/* get the two forks */
! forks[phil->left]--;
! forks[phil->right]--;
Vfork(phil->message);
}
--- 86,108 ----
PHIL *phil; /* philosopher requesting forks */
{
Pfork(phil->message); /* mutually exclusive access to forks */
! while (1)
! {
! if(forks[phil->me] == 0 || forks[phil->right] == 0)
! {
Vfork(phil->message); /* release */
phil->eventbuf = phil->event;
e_wait(&phil->eventbuf, 0, 0L); /* wait for ready condition */
Pfork(phil->message);
! }
! else
! {
! break;
! }
! }
/* get the two forks */
! forks[phil->me]=0;
! forks[phil->right]=0;
Vfork(phil->message);
}
***************
*** 111,121 ****
Pfork(phil->message);
/* drop forks and signal any events */
if(++forks[phil->left] == 2)
e_signal(phils[phil->left].pid, phils[phil->left].event);
if(++forks[phil->right] == 2)
e_signal(phils[phil->right].pid, phils[phil->right].event);
!
Vfork(phil->message);
}
--- 117,132 ----
Pfork(phil->message);
/* drop forks and signal any events */
+ forks[phil->me] = 1;
+ forks[phil->right] = 1;
+ e_signal(phils[phil->left].pid, phils[phil->left].event);
+ e_signal(phils[phil->right].pid, phils[phil->right].event);
+ /*
if(++forks[phil->left] == 2)
e_signal(phils[phil->left].pid, phils[phil->left].event);
if(++forks[phil->right] == 2)
e_signal(phils[phil->right].pid, phils[phil->right].event);
! */
Vfork(phil->message);
}
***************
*** 142,151 ****
moveto(4, phil->col); printf(" Eating "); fflush(stdout);
Vscreen(phil->message);
p_pause( (long)(((Rand() & 15) + 1) * 1000L) );
- putdown(phil);
Pscreen(phil->message);
moveto(4, phil->col); printf(" Thinking "); fflush(stdout);
Vscreen(phil->message);
p_pause( (long)(((Rand() & 15) + 1) * 1000L) );
}
/*NOTREACHED*/
--- 153,162 ----
moveto(4, phil->col); printf(" Eating "); fflush(stdout);
Vscreen(phil->message);
p_pause( (long)(((Rand() & 15) + 1) * 1000L) );
Pscreen(phil->message);
moveto(4, phil->col); printf(" Thinking "); fflush(stdout);
Vscreen(phil->message);
+ putdown(phil);
p_pause( (long)(((Rand() & 15) + 1) * 1000L) );
}
/*NOTREACHED*/