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inception.c
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inception.c
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/* INCEPTION: My tribute to Christopher Nolan
; The code below tries to explain and follow the sequence of events that took place in Inception
; as seen from the eyes of the programmer. It performs the inception through a clever trick
; using x86 code morphing technique in inception.h. This is done so as to make it appear that the thought
; about copying the inception string was done by Fischer himself even though he expected to return to
; a different state in real life.
;
; Copyright (C) 2010-2011 A.R.Karthick
; <a.r.karthick@gmail.com, a_r_karthic@users.sourceforge.net>
;
; This program is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; This program is distributed in the hope that it will be useful,
; but WITHOUT ANY WARRANTY; without even the implied warranty of
; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
; GNU General Public License for more details.
;
; You should have received a copy of the GNU General Public License
; along with this program; if not, write to the Free Software
; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
;
;
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#ifndef __i386__
#define __i386__
#define __fake_x86__
#endif
#include <asm/unistd.h>
#ifdef __fake_x86__
#undef __i386__
#undef __fake_x86__
#endif
#include <pthread.h>
#include <assert.h>
#include <sched.h>
#include <sys/mman.h>
#include <time.h>
#include <syscall.h>
#include "list.h"
#define DREAM_INCEPTION_TARGET 0x1
#define DREAM_INCEPTION_PERFORMER 0x2
#define DREAM_WORLD_ARCHITECT 0x4
#define DREAM_ORGANIZER 0x8
#define DREAM_SHAPES_FAKER 0x10
#define DREAM_SEDATIVE_CREATOR 0x20
#define DREAM_OVERLOOKER 0x40
#define DREAM_ROLE_MASK 0x7f
#define DREAMERS (0x7)
#define output(fmt, arg...) do { fprintf(stderr, fmt, ##arg); } while(0)
struct inception_definitions
{
const char *term;
const char *definition;
} inception_definitions[] = {
{.term= "limbo", .definition = "State of infinite subconsciousness" },
{.term = "totem", .definition = "Object to determine if one is in a dream world or reality" },
};
#define DREAM_LEVELS (0x3 + 1 ) /* + 1 as an illustrative considering the 4th is really a limbo from 3rd */
struct dreamer_request
{
#define DREAMER_HIJACKED 0x1
#define DREAMER_DEFENSE_PROJECTIONS (0x2)
#define DREAMER_FREE_FALL (0x4)
#define DREAMER_FAKE_SHAPE (0x8)
#define DREAMER_SHOT (0x10)
#define DREAMER_KILLED (0x20)
#define DREAMER_NEXT_LEVEL (0x40)
#define DREAMER_IN_LIMBO (0x80)
#define DREAMER_IN_MY_DREAM (0x100) /*shared dream*/
#define DREAMER_KICK_BACK (0x200)
#define DREAMER_FIGHT (0x400)
#define DREAMER_SELF (0x800)
#define DREAMER_FALL (0x1000)
#define DREAMER_SYNCHRONIZE_KICK (0x2000)
#define DREAMER_RECOVER (0x4000)
struct dreamer_attr *dattr; /*dreamer attribute*/
int cmd; /* request cmd */
void *arg; /* request cmd arg*/
struct list list; /* list head marker*/
};
struct dreamer_attr
{
const char *name;
int role;
int shared_state; /* shared request command state*/
int level; /*dreamer level*/
struct list_head request_queue; /* per dreamer request queue*/
struct list list; /* list head marker*/
pthread_mutex_t mutex;
pthread_cond_t *cond[DREAM_LEVELS]; /* per dreamer wake up levels */
};
static pthread_mutex_t inception_reality_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t inception_reality_wakeup_for_all = PTHREAD_COND_INITIALIZER;
static struct list_head dreamer_queue[DREAM_LEVELS];
static pthread_mutex_t dreamer_mutex[DREAM_LEVELS];
#include "inception.h"
static char *fischers_mind_state;
static struct dreamer_attr *fischer_level1;
static pid_t fischer_level1_taskid; /*fischers level1 taskid*/
/*
* Queue the command to the dreamers request queue
*/
static __inline__ void dream_enqueue_cmd(struct dreamer_attr *dattr, int cmd, void *arg, int level)
{
struct dreamer_request *req = calloc(1, sizeof(*req));
assert(req != NULL);
assert(level > 0 && level <= DREAM_LEVELS);
req->dattr = dattr;
req->cmd = cmd;
req->arg = arg;
pthread_mutex_lock(&dattr->mutex);
list_add_tail(&req->list, &dattr->request_queue);
pthread_cond_signal(dattr->cond[level-1]);
pthread_mutex_unlock(&dattr->mutex);
}
/*
* Clone the request command to all the dreamers: Called with lock held.
*/
static void dream_clone_cmd(struct list_head *dreamer_queue, int cmd, void *arg, struct dreamer_attr *dattr, int level)
{
register struct list *iter;
for(iter = dreamer_queue->head; iter; iter = iter->next)
{
struct dreamer_attr *dreamer = LIST_ENTRY(iter, struct dreamer_attr, list);
if(dattr && dreamer == dattr)
continue; /*skip cloning it on this dreamer*/
dream_enqueue_cmd(dreamer, cmd, arg, level);
}
}
static __inline__ struct dreamer_request *dream_dequeue_cmd(struct dreamer_attr *dattr)
{
struct dreamer_request *req = NULL;
struct list *head = NULL;
pthread_mutex_lock(&dattr->mutex);
if(!dattr->request_queue.nodes)
{
pthread_mutex_unlock(&dattr->mutex);
return NULL;
}
head = dattr->request_queue.head;
assert(head != NULL);
req = LIST_ENTRY(head, struct dreamer_request, list);
list_del(head, &dattr->request_queue);
pthread_mutex_unlock(&dattr->mutex);
return req;
}
static struct dreamer_attr *dreamer_find(struct list_head *dreamer_queue, const char *name, int role)
{
register struct list *iter;
for(iter = dreamer_queue->head; iter ; iter = iter->next)
{
struct dreamer_attr *dattr = LIST_ENTRY(iter, struct dreamer_attr, list);
if(role && (dattr->role & role))
return dattr;
if(name &&
!strcasecmp(dattr->name, name))
return dattr;
}
return NULL;
}
static struct dreamer_attr *dreamer_find_sync_locked(struct dreamer_attr *dreamer, int level, const char *name, int role)
{
struct dreamer_attr *dattr = NULL;
if(!level) return NULL;
rescan:
dattr = dreamer_find(&dreamer_queue[level-1], name, role);
if(!dattr)
{
static int c;
pthread_mutex_unlock(&dreamer_mutex[level-1]);
if(++c >= 10)
{
output("[%s] waiting for [%s] to join at level [%d]\n", dreamer->name,
name ?:"Unknown", level);
}
usleep(100000);
pthread_mutex_lock(&dreamer_mutex[level-1]);
goto rescan;
}
return dattr;
}
static struct dreamer_attr *dreamer_find_sync(struct dreamer_attr *dreamer, int level, const char *name, int role)
{
struct dreamer_attr *dattr;
if(!level) return NULL;
pthread_mutex_lock(&dreamer_mutex[level-1]);
dattr = dreamer_find_sync_locked(dreamer, level, name, role);
pthread_mutex_unlock(&dreamer_mutex[level-1]);
return dattr;
}
/*
* In a dream, you run 12 times slower : 5 mins of realtime = 60 mins
* Fake the slowness by reduction in threads priority or the
* scheduling priority of the dreamer
*/
static void set_thread_priority(struct dreamer_attr *dattr, int level)
{
struct sched_param dream_param = {0};
int policy = 0;
assert(pthread_getschedparam(pthread_self(), &policy, &dream_param) == 0);
if(dream_param.sched_priority > 12)
dream_param.sched_priority -= 12;
output("Dreamer [%s], level [%d], priority [%d], policy [%s]\n",
dattr->name, level, dream_param.sched_priority,
policy == SCHED_FIFO ? "FIFO" :
(policy == SCHED_RR ? "RR" : "OTHER"));
assert(pthread_setschedparam(pthread_self(), policy, &dream_param) == 0);
}
/*
* Level 0 is wake up dreamers on all levels
*/
static void wake_up_dreamers(int level)
{
int start = DREAM_LEVELS-1,end = 0;
register int i;
if(level > 0)
{
start = level - 1;
end = level - 1;
}
for(i = start; i >= end; --i)
{
struct list *iter;
pthread_mutex_lock(&dreamer_mutex[i]);
for(iter = dreamer_queue[i].head; iter; iter = iter->next)
{
struct dreamer_attr *dattr = LIST_ENTRY(iter, struct dreamer_attr, list);
dream_enqueue_cmd(dattr, DREAMER_KICK_BACK, NULL, dattr->level);
}
pthread_mutex_unlock(&dreamer_mutex[i]);
}
}
/*
* Called with the dreamer mutex held for the appropriate level.
*/
static void wait_for_kick(struct dreamer_attr *dattr)
{
struct dreamer_request *req = NULL;
int sleep_time = dattr->level * 2;
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd(dattr)) )
{
if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
if(dattr->level > 1)
{
output("[%s] got Kick at level [%d]. Exiting back to level [%d]\n",
dattr->name, dattr->level, dattr->level - 1);
}
else
{
output("[%s] got Kick at level [%d]. Exiting back to reality\n",
dattr->name, dattr->level);
}
goto out;
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += sleep_time;
pthread_cond_timedwait(dattr->cond[dattr->level-1], &dreamer_mutex[dattr->level-1], &ts);
}
out:
return;
}
static struct dreamer_attr *dream_attr_clone(int level, struct dreamer_attr *dattr)
{
struct dreamer_attr *dattr_clone = calloc(1, sizeof(*dattr_clone));
assert(dattr_clone != NULL);
memcpy(dattr_clone, dattr, sizeof(*dattr_clone));
dattr_clone->level = level;
memset(&dattr_clone->mutex, 0, sizeof(dattr_clone->mutex));
assert(pthread_mutex_init(&dattr_clone->mutex, NULL) == 0);
list_init(&dattr_clone->request_queue);
return dattr_clone;
}
static __inline__ void dream_level_create(int level, void * (*dream_function) (void *), struct dreamer_attr *dattr)
{
pthread_attr_t attr;
pthread_t dream;
struct dreamer_attr *dattr_clone = dream_attr_clone(level, dattr);
assert(dattr_clone != NULL);
assert(pthread_attr_init(&attr)==0);
assert(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0);
assert(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED)==0);
assert(pthread_create(&dream, &attr, dream_function, dattr_clone) == 0);
}
/*
* TODO next: Limbo is a state of infinite subconciousness
*/
static void enter_limbo(struct dreamer_attr *dattr)
{
struct dreamer_attr *clone = NULL;
struct dreamer_request *req = NULL;
#if 1 /* let it spin in limbo until the last phase below is complete */
for(;;) sleep(10);
#endif
dattr->shared_state |= DREAMER_IN_LIMBO;
clone = dream_attr_clone(dattr->level+1, dattr);
assert(clone != NULL);
pthread_mutex_lock(&dreamer_mutex[3]);
list_add_tail(&clone->list, &dreamer_queue[3]);
while( (dreamer_queue[3].nodes + 3) != DREAMERS)
{
pthread_mutex_unlock(&dreamer_mutex[3]);
usleep(100000);
pthread_mutex_lock(&dreamer_mutex[3]);
}
switch( (clone->role & DREAM_ROLE_MASK) )
{
case DREAM_INCEPTION_PERFORMER: /* Cobb */
{
}
break;
case DREAM_WORLD_ARCHITECT: /* Ariadne */
{
}
break;
case DREAM_OVERLOOKER: /* Saito */
{
}
break;
case DREAM_INCEPTION_TARGET: /*Fischer*/
{
}
break;
}
}
/*
* The last level of the dream beyond which we enter limbo.
*/
static void *dream_level_3(void *arg)
{
struct dreamer_attr *dattr = arg;
struct dreamer_request *req = NULL;
assert(dattr->level == 3);
set_thread_priority(dattr, 3);
pthread_mutex_lock(&dreamer_mutex[2]);
list_add_tail(&dattr->list, &dreamer_queue[2]);
while( (dreamer_queue[2].nodes + 2 != DREAMERS ) )
{
pthread_mutex_unlock(&dreamer_mutex[2]);
usleep(10000);
pthread_mutex_lock(&dreamer_mutex[2]);
}
/*
* All have joined in level 3
*/
switch( (dattr->role & DREAM_ROLE_MASK) )
{
case DREAM_INCEPTION_PERFORMER: /* Cobb */
{
struct dreamer_attr *fischer = NULL;
struct dreamer_attr *ariadne = NULL;
struct dreamer_attr *eames = NULL;
/*
* Self enqueue
*/
fischer = dreamer_find(&dreamer_queue[2], "fischer", DREAM_INCEPTION_TARGET);
ariadne = dreamer_find(&dreamer_queue[2], "ariadne", DREAM_WORLD_ARCHITECT);
eames = dreamer_find(&dreamer_queue[2], "eames", DREAM_SHAPES_FAKER);
dream_enqueue_cmd(dattr, DREAMER_FIGHT, NULL, dattr->level);
dream_enqueue_cmd(dattr, DREAMER_IN_MY_DREAM, (void*)"Mal", dattr->level);
for(;;)
{
while ( (req = dream_dequeue_cmd(dattr)))
{
if(req->cmd == DREAMER_FIGHT)
{
output("[%s] fights Fischers defense projections in level [%d]\n",
dattr->name, dattr->level);
}
else if(req->cmd == DREAMER_IN_MY_DREAM)
{
output("[%s] sees his wife [%s] in his dream. [%s] shoots Fischer\n",
dattr->name, (char*)req->arg, (char*)req->arg);
dream_enqueue_cmd(fischer, DREAMER_SHOT, (void*)"Mal", fischer->level);
/*
* Let Eames know so he could start recovery on Fischer
*/
dream_enqueue_cmd(eames, DREAMER_SHOT, fischer, dattr->level);
/*
* Ask Ariadne to follow me in limbo.
*/
output("[%s] asks [%s] to follow him in limbo with his wife\n",
dattr->name, ariadne->name);
dream_enqueue_cmd(ariadne, DREAMER_IN_MY_DREAM, dattr, dattr->level);
/*
* Give up the lock and take a break before trying to grab the lock again
*/
pthread_mutex_unlock(&dreamer_mutex[2]);
usleep(100000);
pthread_mutex_lock(&dreamer_mutex[2]);
/*
* Self enqueue to get into limbo.
*/
dream_enqueue_cmd(dattr, DREAMER_IN_LIMBO, dattr, dattr->level);
}
else if(req->cmd == DREAMER_IN_LIMBO)
{
output("[%s] enters limbo with his Wifes projections in level [%d]\n",
dattr->name, dattr->level);
pthread_mutex_unlock(&dreamer_mutex[2]);
enter_limbo(dattr);
pthread_mutex_lock(&dreamer_mutex[2]);
/*
* should not be reached
*/
output("[%s] returned from limbo. Exiting out at level [%d]\n", dattr->name,
dattr->level);
exit(0);
}
free(req);
}
pthread_mutex_unlock(&dreamer_mutex[2]);
sleep(2);
pthread_mutex_lock(&dreamer_mutex[2]);
}
}
break;
case DREAM_WORLD_ARCHITECT: /* Ariadne*/
{
/*
* Wait for Cobbs command to enter his dream in limbo with him.
*/
struct timespec ts = {0};
int ret_from_limbo = 0;
for(;;)
{
while ( (req = dream_dequeue_cmd(dattr)) )
{
if(req->cmd == DREAMER_IN_MY_DREAM)
{
output("[%s] enters with Cobb. to meet his wife in Limbo at level [%d]\n",
dattr->name, dattr->level);
pthread_mutex_unlock(&dreamer_mutex[2]);
enter_limbo(dattr);
pthread_mutex_lock(&dreamer_mutex[2]);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
if(!ret_from_limbo)
{
output("[%s] returned from Fischers limbo to level [%d]\n",
dattr->name, dattr->level);
}
else
{
free(req);
output("[%s] got Kick back from level [%d]. Exiting back to level [%d]\n",
dattr->name, dattr->level, dattr->level-1);
goto out_unlock;
}
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 6;
pthread_cond_timedwait(dattr->cond[2], &dreamer_mutex[2], &ts);
}
}
break;
case DREAM_SHAPES_FAKER: /* Eames*/
{
struct timespec ts = {0};
struct dreamer_attr *fischer = NULL;
struct dreamer_attr *saito = NULL;
saito = dreamer_find(&dreamer_queue[2], "saito", DREAM_OVERLOOKER);
/*
* Self enqueue and he is the dreamer at this level
*/
dream_enqueue_cmd(dattr, DREAMER_FIGHT, dattr, dattr->level);
/*
* Ask Saito to fight first before he is killed!
*/
dream_enqueue_cmd(saito, DREAMER_FIGHT, dattr, dattr->level);
dream_enqueue_cmd(saito, DREAMER_KILLED, saito, dattr->level);
for(;;)
{
while ( (req = dream_dequeue_cmd(dattr)))
{
if(req->cmd == DREAMER_FIGHT)
{
output("[%s] fights Fischers defense projections at level [%d]\n",
dattr->name, dattr->level);
}
else if(req->cmd == DREAMER_SHOT)
{
fischer = ( (struct dreamer_attr*)req->arg);
output("[%s] sees [%s] shot in level [%d]. Starts recovery\n",
dattr->name, fischer->name, dattr->level);
dream_enqueue_cmd(dattr, DREAMER_RECOVER, fischer, dattr->level);
}
else if(req->cmd == DREAMER_RECOVER)
{
output("[%s] doing recovery on [%s] who is shot at level [%d]\n",
dattr->name, ( (struct dreamer_attr*)req->arg)->name, dattr->level);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got Kick at level [%d]. Exiting back to level [%d]\n",
dattr->name, dattr->level, dattr->level - 1);
goto out_unlock;
}
free(req);
}
if(fischer)
{
/*
* Keep recovering fischer if he is shot in this level.
*/
dream_enqueue_cmd(dattr, DREAMER_RECOVER, fischer, dattr->level);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 6;
pthread_cond_timedwait(dattr->cond[2], &dreamer_mutex[2], &ts);
}
}
break;
case DREAM_OVERLOOKER: /*Saito*/
{
struct timespec ts = {0};
for(;;)
{
while( (req = dream_dequeue_cmd(dattr)))
{
if(req->cmd == DREAMER_FIGHT)
{
output("[%s] fights Fischers projections in level [%d]\n",
dattr->name, dattr->level);
}
else if(req->cmd == DREAMER_KILLED) /* Killed. Enter limbo */
{
output("[%s] gets killed at level [%d]. Enters limbo\n", dattr->name, dattr->level);
pthread_mutex_unlock(&dreamer_mutex[2]);
enter_limbo(dattr);
pthread_mutex_lock(&dreamer_mutex[2]);
/*
* Unreached.
*/
output("[%s] returned back from Limbo at level [%d]\n", dattr->name, dattr->level);
exit(0);
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 6;
pthread_cond_timedwait(dattr->cond[2], &dreamer_mutex[2], &ts);
}
}
break;
case DREAM_INCEPTION_TARGET: /* Fischer */
{
int reconciled = 0;
struct timespec ts = {0};
for(;;)
{
while ( (req = dream_dequeue_cmd(dattr)))
{
if(req->cmd == DREAMER_SHOT)
{
output("[%s] shot by [%s] in level [%d]\n",
dattr->name, (char*)req->arg, dattr->level);
/*
* Freeze for sometime before joining Cobb and Ariadne in limbo.
*/
pthread_mutex_unlock(&dreamer_mutex[2]);
usleep(100000);
enter_limbo(dattr);
pthread_mutex_lock(&dreamer_mutex[2]);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
if(!reconciled)
{
struct dreamer_attr *cobb = NULL;
output("[%s] got a kick back from Limbo to reconcile with his father at level [%d]\n",
dattr->name, dattr->level);
reconciled = 1;
cobb = dreamer_find(&dreamer_queue[2], "cobb", DREAM_INCEPTION_PERFORMER);
dream_enqueue_cmd(cobb, DREAMER_RECOVER, dattr, cobb->level);
}
else
{
free(req);
output("[%s] got a kick at level [%d]. Falling back to level [%d]\n",
dattr->name, dattr->level, dattr->level - 1);
goto out_unlock;
}
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 6;
pthread_cond_timedwait(dattr->cond[2], &dreamer_mutex[2], &ts);
}
}
break;
default:
break;
}
out_unlock:
pthread_mutex_unlock(&dreamer_mutex[2]);
wake_up_dreamers(2);
return NULL;
}
static void *dream_level_2(void *arg)
{
struct dreamer_attr *dattr = arg;
int dreamers = 0;
assert(dattr->level == 2);
set_thread_priority(dattr, 2);
/*
* take level 2 lock.
*/
pthread_mutex_lock(&dreamer_mutex[1]);
list_add_tail(&dattr->list, &dreamer_queue[1]);
/*
* Wait for the expected members to join at this level.
*/
while( (dreamers = dreamer_queue[1].nodes)+1 != DREAMERS)
{
pthread_mutex_unlock(&dreamer_mutex[1]);
usleep(10000);
pthread_mutex_lock(&dreamer_mutex[1]);
}
switch((dattr->role & DREAM_ROLE_MASK))
{
case DREAM_INCEPTION_PERFORMER: /* Cobb in level 2 */
{
/*
* Wait for Ariadne and Fischer to join me. at this level after meeting with Arthur
*/
struct dreamer_request *req;
int wait_for_dreamers = DREAM_WORLD_ARCHITECT | DREAM_INCEPTION_TARGET;
while(wait_for_dreamers > 0)
{
while( (!(req = dream_dequeue_cmd(dattr)) )
||
req->cmd != DREAMER_IN_MY_DREAM
||
!req->arg
||
!( ((struct dreamer_attr*)req->arg)->role & wait_for_dreamers)
)
{
if(req) free(req);
pthread_mutex_unlock(&dreamer_mutex[1]);
usleep(10000);
pthread_mutex_lock(&dreamer_mutex[1]);
}
wait_for_dreamers &= ~((struct dreamer_attr*)req->arg)->role;
output("[%s] taking [%s] to level 3\n", dattr->name, ((struct dreamer_attr*)req->arg)->name);
dream_enqueue_cmd((struct dreamer_attr*)req->arg, DREAMER_NEXT_LEVEL, dattr, dattr->level);
free(req);
}
/*
* Ariadne + Fischer has joined. Go to level 3. myself
*/
dream_level_create(dattr->level + 1, dream_level_3, dattr);
/*
* Just do nothing and wait for kick back to previous level.
*/
wait_for_kick(dattr);
}
break;
case DREAM_WORLD_ARCHITECT : /*Ariadne*/
{
struct dreamer_request *req;
struct dreamer_attr *arthur;
struct dreamer_attr *cobb;
arthur = dreamer_find_sync_locked(dattr, dattr->level, "arthur", DREAM_ORGANIZER);
cobb = dreamer_find_sync_locked(dattr,dattr->level,"cobb",DREAM_INCEPTION_PERFORMER);
assert(arthur != NULL);
assert(cobb != NULL);
/*
* Add ourselves/Ariadne in Arthurs dream. and wait for Arthur to signal
*/
output("[%s] joining [%s] in his dream at level 2 to fight Fischers defense projections\n",
dattr->name, arthur->name);
dream_enqueue_cmd(arthur, DREAMER_IN_MY_DREAM, dattr, dattr->level);
pthread_cond_wait(dattr->cond[1], &dreamer_mutex[1]);
/*
* Now join Cobb. before taking Fischer to level 3.
*/
output("[%s] joining [%s] in his dream at level 2 to help Fischer\n",
dattr->name, cobb->name);
dream_enqueue_cmd(cobb, DREAMER_IN_MY_DREAM, dattr, dattr->level);
/*
* Wait for the request to enter the next level or a kick back.
*/
for(;;)
{
struct timespec ts = {0};
while( (req = dream_dequeue_cmd(dattr)) )
{
if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got KICK while at level [%d]. Exiting back to level [%d]\n",
dattr->name, dattr->level, dattr->level - 1);
goto out_unlock;
}
if(req->cmd == DREAMER_NEXT_LEVEL)
{
output("[%s] following [%s] to level [%d]\n",
dattr->name, ( (struct dreamer_attr*)req->arg)->name, dattr->level + 1);
dream_level_create(dattr->level + 1, dream_level_3, dattr);
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 4;
pthread_cond_timedwait(dattr->cond[1], &dreamer_mutex[1], &ts);
}
}
break;
case DREAM_ORGANIZER: /*Arthur*/
{
struct dreamer_attr *ariadne = NULL;
struct dreamer_request *req = NULL;
struct dreamer_attr *self = NULL;
struct timespec ts = {0};
for(;;)
{
while ( (req = dream_dequeue_cmd(dattr)) )
{
if(req->cmd == DREAMER_IN_MY_DREAM) /* check if Ariadne joined */
{
ariadne = (struct dreamer_attr*)req->arg;
assert(ariadne->role == DREAM_WORLD_ARCHITECT);
output("[%s] joined [%s] in level [%d]\n",
ariadne->name, dattr->name, dattr->level);
}
else assert(req->cmd != DREAMER_KICK_BACK); /* cannot receive kick back yet*/
free(req);
}
if(!ariadne) /* If ariadne hadn't arrived, wait for her to join*/
{
output("[%s] waiting for Ariadne to join in level [%d]\n",
dattr->name, dattr->level);
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 4;
pthread_cond_timedwait(dattr->cond[1], &dreamer_mutex[1], &ts);
}
else break;
}
/*
* update the state to fight defense projections of Fischer
*/
dattr->shared_state = DREAMER_FIGHT;
/*
* Signal Ariadne to join Cobb. to get into level 3 while I wait fighting projections
*/
dream_enqueue_cmd(ariadne, DREAMER_IN_MY_DREAM, (void*)dattr, dattr->level);
/*
* Signal self dreamer in the next level below.
*/
self = dreamer_find(&dreamer_queue[dattr->level-2], NULL, DREAM_ORGANIZER);
assert(self != NULL);
dream_enqueue_cmd(self, DREAMER_SELF, dattr, self->level);
for(;;)
{
while ( ( req = dream_dequeue_cmd(dattr)) )
{
if(req->cmd == DREAMER_FREE_FALL)
{
struct dreamer_attr *dreamer_falling = (struct dreamer_attr*)req->arg;
output("[%s] experiencing Free fall in level [%d] coz of a fall triggered "
" of [%s] in level [%d]\n",
dattr->name, dattr->level, dreamer_falling->name, dreamer_falling->level);
}
else if(req->cmd == DREAMER_FIGHT) /* instruction to fight */
{
output("[%s] Fighting Fischers projections in level [%d]\n",
dattr->name, dattr->level);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got Kick at level [%d]. Exiting to level [%d]\n",
dattr->name, dattr->level, dattr->level - 1);
goto out_unlock;
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 4;
pthread_cond_timedwait(dattr->cond[1], &dreamer_mutex[1], &ts);
}
}
break;
case DREAM_INCEPTION_TARGET: /* Fischer */
{
struct dreamer_attr *cobb = NULL;
struct dreamer_request *req = NULL;
/*
* First hunt for Cobb in this level.
*/
cobb = dreamer_find(&dreamer_queue[1], "cobb", DREAM_INCEPTION_PERFORMER);
dream_enqueue_cmd(cobb, DREAMER_IN_MY_DREAM, dattr, dattr->level);
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd(dattr)) )
{
if(req->cmd == DREAMER_NEXT_LEVEL)
{
output("[%s] following [%s] to level [%d]\n",
dattr->name, ( (struct dreamer_attr*)req->arg)->name, dattr->level + 1);
dream_level_create(dattr->level + 1, dream_level_3, dattr);
}
else if(req->cmd == DREAMER_FAKE_SHAPE)
{
output("[%s] met with Browning again in level [%d]. "
"Waits for Cobb before getting into level [%d] to meet his father\n",
dattr->name, dattr->level, dattr->level + 1);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got Kick at level [%d]. Exiting back to level [%d]\n",
dattr->name, dattr->level, dattr->level-1);
goto out_unlock;
}
free(req);
}
assert(clock_gettime(CLOCK_REALTIME, &ts) == 0);
ts.tv_sec += 4;
pthread_cond_timedwait(dattr->cond[1], &dreamer_mutex[1], &ts);
}
}
break;
case DREAM_SHAPES_FAKER: /*Eames*/
{
struct dreamer_attr *fischer = NULL;
/*
* Find fischer and fake Browning to manipulate him for the final inception.
* by creating a doubt in his mind.
*/
fischer = dreamer_find(&dreamer_queue[1], "fischer", DREAM_INCEPTION_TARGET);
output("[%s] Faking Browning's projection to Fischer at level [%d]\n",
dattr->name, dattr->level);
dream_enqueue_cmd(fischer, DREAMER_FAKE_SHAPE, dattr, dattr->level);
/*
* Follow cobb to level 3
*/
output("[%s] following Cobb to level [%d]\n", dattr->name, dattr->level+1);
dream_level_create(dattr->level + 1, dream_level_3, dattr);
wait_for_kick(dattr);
}
break;
case DREAM_OVERLOOKER: /*Saito*/
{
/*
* Follow Cobb to level 3. Also you are shot. in level 1
*/
output("[%s] following Cobb to level [%d]\n", dattr->name, dattr->level+1);
dream_level_create(dattr->level + 1, dream_level_3, dattr);
wait_for_kick(dattr);
}
break;
default:
break;
}
out_unlock:
pthread_mutex_unlock(&dreamer_mutex[1]);
/*
* Signal waiters at level 1
*/
wake_up_dreamers(1);
return NULL;
}
static void go_with_fischer_to_level_2(struct dreamer_attr *fischer, struct dreamer_attr *dattr)
{
/*
* Take fischer to the next level.
*/
output("[%s] taking Fischer to level 2\n", dattr->name);
dream_enqueue_cmd(fischer, DREAMER_NEXT_LEVEL, dattr, fischer->level);
dream_level_create(dattr->level + 1, dream_level_2, dattr);
}
/*
* Yusuf or the sedative creator continues fighting Fischers projections and dreaming in level 2
* Called with the dreamer mutex lock held
*/
static void continue_dreaming_in_level_1(struct dreamer_attr *dattr)
{
struct dreamer_request *req = NULL;
struct dreamer_attr *arthur = NULL;
output("[%s] starts to fall into the bridge while fighting Fischers projections in level [%d]\n",
dattr->name, dattr->level);
arthur = dreamer_find(&dreamer_queue[0], "arthur", DREAM_ORGANIZER);
pthread_mutex_unlock(&dreamer_mutex[0]);
/*
* Wait for Arthur to enter level 2 before starting the fall.
*/
pthread_mutex_lock(&dreamer_mutex[0]);
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd(dattr) ) )
{
/*
* The time to exit and wake up all dreamers
*/
if(req->cmd == DREAMER_SYNCHRONIZE_KICK)
{
free(req);
output("[%s] going to wake up all the others through a synchronized kick by effecting the VAN "
"to fall into the bridge\n", dattr->name);
goto out_unlock;
}
free(req);
}
output("[%s] while falling into the bridge trigger Arthurs fall in level [%d]\n", dattr->name, dattr->level);
dream_enqueue_cmd(arthur, DREAMER_FALL, dattr, dattr->level);
assert(clock_gettime(CLOCK_REALTIME, &ts) ==0);
ts.tv_sec += 2;
pthread_cond_timedwait(dattr->cond[0], &dreamer_mutex[0], &ts);
}
out_unlock:
pthread_mutex_unlock(&dreamer_mutex[0]);
wake_up_dreamers(0); /* wake up all */
}
/*
* This is the level 1 of Fischer's request processing loop
*/
static void fischer_dream_level1(void)
{
struct dreamer_request *req = NULL;
struct dreamer_attr *dattr = fischer_level1;