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居然有人写了这样一个程序 
转自：http://github.com/karthick18/inception/blob/master/inception.c
/* 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>
#include <pthread.h>
#include <assert.h>
#include <sched.h>
#include <sys/mman.h>
#include <time.h>
#ifdef __linux__
#include <syscall.h>
#define GET_TID syscall(SYS_gettid)
#else
#define GET_TID ({0;})
#endif
#include "list.h"
#include "inception_arch.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)
/*
* fprintf output buffer is thread-safe anyway. So don't care much
*/
#define output(fmt, arg...) do { fprintf(stdout, fmt, ##arg);} while(0)
#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];
static pthread_mutex_t limbo_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t limbo_cond = PTHREAD_COND_INITIALIZER;
#define _INCEPTION_C_
#include "inception.h"
static char *fischers_mind_state;
static struct dreamer_attr *fischer_level1;
static pid_t fischer_level1_taskid; /*fischers level1 taskid*/
static int dream_delay_map[DREAM_LEVELS] = { 1, 2, 4, 8};
static int dreamers_in_reality;
static void fischer_dream_level1(void) __attribute__((unused));
/*
* Queue the command to the dreamers request queue
*/
static void __dream_enqueue_cmd(struct dreamer_attr *dattr, int cmd, void *arg, int level, int locked)
{
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;
if(!locked)
pthread_mutex_lock(&dattr->mutex);
list_add_tail(&req->list, &dattr->request_queue);
pthread_cond_signal(dattr->cond[level-1]);
if(!locked)
pthread_mutex_unlock(&dattr->mutex);
}
static __inline__ void dream_enqueue_cmd(struct dreamer_attr *dattr, int cmd, void *arg, int level)
{
return __dream_enqueue_cmd(dattr, cmd, arg, level, 0);
}
static __inline__ void dream_enqueue_cmd_safe(struct dreamer_attr *dattr, int cmd,
void *arg, int level, pthread_mutex_t *dreamer_lock)
{
/*
* Drop the current level dreamer lock before reacquiring.
*/
pthread_mutex_unlock(dreamer_lock);
__dream_enqueue_cmd(dattr, cmd, arg, level, 0);
pthread_mutex_lock(dreamer_lock);
}
static __inline__ void dream_enqueue_cmd_locked(struct dreamer_attr *dattr, int cmd, void *arg, int level)
{
return __dream_enqueue_cmd(dattr, cmd, arg, level, 1);
}
/*
* 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 struct dreamer_request *dream_dequeue_cmd_locked(struct dreamer_attr *dattr)
{
struct dreamer_request *req = NULL;
struct list *head = NULL;
if(!dattr->request_queue.nodes)
return NULL;
head = dattr->request_queue.head;
assert(head != NULL);
req = LIST_ENTRY(head, struct dreamer_request, list);
list_del(head, &dattr->request_queue);
return req;
}
static __inline__ struct dreamer_request *dream_dequeue_cmd(struct dreamer_attr *dattr)
{
struct dreamer_request *req;
pthread_mutex_lock(&dattr->mutex);
req = dream_dequeue_cmd_locked(dattr);
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);
}
/*
* Wake up an individual dreamer in one level and let him propagate the kick down to levels below.
*/
static void wake_up_dreamer(struct dreamer_attr *dattr, int level)
{
register struct list *iter;
if(!level || (dattr->shared_state & DREAMER_IN_LIMBO)) return;
pthread_mutex_lock(&dreamer_mutex[level-1]);
for(iter = dreamer_queue[level-1].head; iter; iter = iter->next)
{
struct dreamer_attr *dreamer = LIST_ENTRY(iter, struct dreamer_attr, list);
if( !(dreamer->role ^ dattr->role) )
{
dream_enqueue_cmd(dreamer, DREAMER_KICK_BACK, NULL, dreamer->level);
break;
}
}
pthread_mutex_unlock(&dreamer_mutex[level-1]);
}
/*
* Level 0 is wake up dreamers on all levels.
* Skip guys in a limbo from that level to all the way down.
*/
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);
for(iter = dreamer_queue.head; iter; iter = iter->next)
{
struct dreamer_attr *dattr = LIST_ENTRY(iter, struct dreamer_attr, list);
if( (dattr->shared_state & DREAMER_IN_LIMBO) )
continue;
dream_enqueue_cmd(dattr, DREAMER_KICK_BACK, NULL, dattr->level);
}
pthread_mutex_unlock(&dreamer_mutex);
}
}
/*
* Update states on all the levels and down.
*/
static void set_state(struct dreamer_attr *dattr, int state)
{
register int i;
for(i = DREAM_LEVELS - 1; i >= 0; --i)
{
register struct list *iter;
pthread_mutex_lock(&dreamer_mutex);
for(iter = dreamer_queue.head; iter; iter = iter->next)
{
struct dreamer_attr *dreamer = LIST_ENTRY(iter, struct dreamer_attr, list);
if(!(dreamer->role ^ dattr->role))
{
dreamer->shared_state |= state;
break;
}
}
pthread_mutex_unlock(&dreamer_mutex);
}
}
/*
* Set the limbo state on all levels of this dreamer so he cannot get a kick back
* Called with the lock on that level.
*/
static void set_limbo_state(struct dreamer_attr *dattr)
{
set_state(dattr, DREAMER_IN_LIMBO);
}
/*
* Called with the dreamer attr mutex held for the appropriate level.
*/
static void wait_for_kick(struct dreamer_attr *dattr)
{
struct dreamer_request *req = NULL;
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd_locked(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);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[dattr->level-1], &dattr->mutex, &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);
}
/*
* Now this is the state where Cobb. meets Saito.
* The beauty of the Films ending is: Did Cobb take a kick back to reality on seeing Saito remind him
* that he has been in a limbo with his wife and has to come back to become Young.
* And does Saito take the kick back when Cobb. pulls the trigger on him implicitly in limbo to give him the kick back.
* Either way based on whether Cobb. got the kick back from limbo or not, the end is a reality or limbo.
* Thats the ingenuity of Inception. So I think its better if we don't mess this up for ourselves and
* just sleep here till infinity!
*/
static void infinite_subconsciousness(struct dreamer_attr *dattr)
{
struct timespec ts = {0};
static int dreamers;
pthread_mutex_lock(&limbo_mutex);
++dreamers;
while(dreamers != 2)
{
arch_gettime(2, &ts);
pthread_cond_timedwait(&limbo_cond, &limbo_mutex, &ts);
}
/*
* Wait for the signal from Fischer
*/
while(!dreamers_in_reality)
{
arch_gettime(1, &ts);
pthread_cond_timedwait(&limbo_cond, &limbo_mutex, &ts);
}
if((dattr->role & DREAM_INCEPTION_PERFORMER))
{
output("\n\nCobbs' search for Saito ends in Limbo. Now either both take the kick back to reality "
"or the ending is still a state of limbo from Cobbs' perspective, which is what Nolan wants us to think\n");
output("This is in spite of witnessing his children turn towards him for the first time which we're never shown in his projections.\n");
output("So, let me end the limbo state abruptly like the Movie with the totem spinning and leave it to the reviewers to decide the infinite sleep:-)\n\n");
}
pthread_cond_signal(&limbo_cond);
pthread_mutex_unlock(&limbo_mutex);
sleep(1<<31);
}
/*
* 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;
pthread_mutex_lock(&dattr->mutex);
dattr->shared_state |= DREAMER_IN_LIMBO;
clone = dream_attr_clone(dattr->level+1, dattr);
pthread_mutex_unlock(&dattr->mutex);
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]);
}
pthread_mutex_unlock(&dreamer_mutex[3]);
switch( (clone->role & DREAM_ROLE_MASK) )
{
case DREAM_INCEPTION_PERFORMER: /* Cobb */
{
struct timespec ts;
struct dreamer_attr *ariadne = NULL;
int inception_done = 0;
int search_for_saito = 0;
ariadne = dreamer_find(&dreamer_queue[3], "ariadne", DREAM_WORLD_ARCHITECT);
/*
* Self enqueue Mal and her thoughts into the dream
*/
dream_enqueue_cmd(clone, DREAMER_IN_MY_DREAM, (void*)"Cobb takes Elevator to meet Mal", clone->level);
dream_enqueue_cmd(clone, DREAMER_IN_MY_DREAM,
(void*)"[Cobb] tells [Mal] about his inception on her to think that the WORLD is unreal",
clone->level);
dream_enqueue_cmd(clone, DREAMER_IN_MY_DREAM,
(void*)"[Mal] wants [Cobb] to go back with him into the world they built in their dreams",
clone->level);
pthread_mutex_lock(&clone->mutex);
for(;;)
{
while( (req = dream_dequeue_cmd_locked(clone)) )
{
/*
* Meets Mal
*/
if(req->cmd == DREAMER_IN_MY_DREAM)
{
output("%s in level [%d] while in limbo\n", (const char*)req->arg, clone->level);
}
/*
* Mal killed
*/
else if(req->cmd == DREAMER_KILLED)
{
output("[%s] finds %s in level [%d] while in limbo\n",
clone->name, (const char*)req->arg, clone->level);
}
/*
* Recover to search for Saito. Here mark the inception
*/
else if(req->cmd == DREAMER_RECOVER)
{
struct dreamer_attr *source = (struct dreamer_attr*)req->arg;
/*
* If the recovery trigger is from ariadne
*/
if( (source->role & DREAM_WORLD_ARCHITECT) )
{
if(!inception_done)
{
search_for_saito = 1;
}
else
{
pthread_mutex_unlock(&clone->mutex);
search_saito:
output("[%s] enters limbo to search for Saito in limbo at level [%d]\n",
clone->name, clone->level);
set_limbo_state(clone);
usleep(10000);
infinite_subconsciousness(clone);
pthread_mutex_lock(&clone->mutex);
output("[%s] returned after searching for Saito in limbo at level [%d]\n",
clone->name, clone->level);
assert(0); /* should not return back here*/
}
}
/*
* Indicator from Fischer for the final shot.
*/
else if( (source->role & DREAM_INCEPTION_TARGET) )
{
pthread_mutex_unlock(&clone->mutex);
inception_done = 1;
memcpy(fischers_mind_state, inception_thoughts, sizeof(inception_thoughts));
/*
* Send recovery indicator to Ariadne
*/
dream_enqueue_cmd(ariadne, DREAMER_RECOVER, clone, ariadne->level);
if(search_for_saito)
{
goto search_saito;
}
pthread_mutex_lock(&clone->mutex);
}
}
}
arch_gettime(dream_delay_map[clone->level-1], &ts);
pthread_cond_timedwait(clone->cond[3], &clone->mutex, &ts);
}
}
break;
case DREAM_WORLD_ARCHITECT: /* Ariadne */
{
struct dreamer_attr *cobb = NULL;
struct dreamer_attr *fischer = NULL;
struct timespec ts = {0};
cobb = dreamer_find(&dreamer_queue[3], "cobb", DREAM_INCEPTION_PERFORMER);
fischer = dreamer_find(&dreamer_queue[3], "fischer", DREAM_INCEPTION_TARGET);
/*
* Self enqueue to follow Cobb. in the Elevator to his wife.
*/
dream_enqueue_cmd(clone, DREAMER_IN_MY_DREAM, cobb, clone->level);
pthread_mutex_lock(&clone->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(clone) ) )
{
if(req->cmd == DREAMER_IN_MY_DREAM)
{
output("[%s] follows [%s] in Elevator to level [%d] in Limbo to meet his wife\n",
clone->name, cobb->name, clone->level);
pthread_mutex_unlock(&clone->mutex);
/*
* Take a breather while Cobb. interacts with his and tells her about his inception.
*/
sleep(dream_delay_map[clone->level-1]);
dream_enqueue_cmd(cobb, DREAMER_KILLED, (void*)"[Mal] killed", cobb->level);
/*
* Quick breather
*/
usleep(10000);
/*
* Now send Fischer a kick back from limbo down to reconcile.
*/
dream_enqueue_cmd(fischer, DREAMER_KICK_BACK, clone, fischer->level);
/*
* Now tell Cobb. to recover and go and search Saito as he is the only one who can
* search her in limbo.
*/
output("[%s] tells [%s] to search for Saito in limbo at level [%d]\n",
clone->name, cobb->name, clone->level);
dream_enqueue_cmd(cobb, DREAMER_RECOVER, clone, cobb->level);
pthread_mutex_lock(&clone->mutex);
}
else if(req->cmd == DREAMER_RECOVER)
{
/*
* Indication for us to take the kick back.
*/
dream_enqueue_cmd_safe(clone, DREAMER_KICK_BACK, clone, clone->level, &clone->mutex);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
struct dreamer_attr *self = NULL; /*ourself in lower level*/
/*
* Return back
*/
dattr->shared_state &= ~DREAMER_IN_LIMBO;
clone->shared_state &= ~DREAMER_IN_LIMBO;
pthread_mutex_unlock(&clone->mutex);
free(req);
usleep(10000);
self = dreamer_find_sync(clone, clone->level-1, "ariadne", DREAM_WORLD_ARCHITECT);
dream_enqueue_cmd(self, DREAMER_KICK_BACK, clone, self->level);
output("[%s] taking the kick back from limbo at level [%d] to level [%d]\n",
clone->name, clone->level, clone->level-1);
goto out;
}
free(req);
}
arch_gettime(dream_delay_map[clone->level-1], &ts);
pthread_cond_timedwait(clone->cond[3], &clone->mutex, &ts);
}
}
break;
case DREAM_OVERLOOKER: /* Saito */
{
set_limbo_state(clone);
usleep(1000);
infinite_subconsciousness(clone);
}
break;
case DREAM_INCEPTION_TARGET: /*Fischer*/
{
struct dreamer_attr *self = NULL;
struct timespec ts = {0};
/*
* Find ourselves in the lower level to take the kick back.
*/
self = dreamer_find_sync(clone, clone->level-1, "fischer", DREAM_INCEPTION_TARGET);
pthread_mutex_lock(&clone->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(clone)) )
{
if(req->cmd == DREAMER_KICK_BACK)
{
dattr->shared_state &= ~DREAMER_IN_LIMBO;
clone->shared_state &= ~DREAMER_IN_LIMBO;
pthread_mutex_unlock(&clone->mutex);
free(req);
dream_enqueue_cmd(self, DREAMER_KICK_BACK, clone, self->level);
output("[%s] kicking off from limbo at [%d] to level [%d]\n",
clone->name, clone->level, clone->level-1);
goto out;
}
free(req);
}
arch_gettime(dream_delay_map[clone->level-1], &ts);
pthread_cond_timedwait(clone->cond[3], &clone->mutex, &ts);
}
}
break;
}
out:
return ;
}
/*
* 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]);
}
pthread_mutex_unlock(&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;
struct timespec ts = {0};
/*
* 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, (void*)"Fischer", dattr->level);
dream_enqueue_cmd(dattr, DREAMER_IN_MY_DREAM, (void*)"Mal", dattr->level);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(dattr)))
{
if(req->cmd == DREAMER_FIGHT)
{
output("[%s] fights [%s] defense projections in level [%d]\n",
dattr->name, (char*)req->arg, dattr->level);
}
else if(req->cmd == DREAMER_IN_MY_DREAM)
{
pthread_mutex_unlock(&dattr->mutex);
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);
/*
* Hint to Ariadne about Fischers death from Mal's hands
* Take the dreamer mutex for a synchronized reply wait.
*/
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_mutex_lock(&dreamer_mutex[dattr->level-1]);
dream_enqueue_cmd(ariadne, DREAMER_SHOT, (void*)"Fischer shot by Mal", dattr->level);
pthread_cond_timedwait(dattr->cond[dattr->level-1],
&dreamer_mutex[dattr->level-1], &ts);
pthread_mutex_unlock(&dreamer_mutex[dattr->level-1]);
pthread_mutex_lock(&dattr->mutex);
}
else if(req->cmd == DREAMER_NEXT_LEVEL)
{
pthread_mutex_unlock(&dattr->mutex);
output("[%s] follows [%s] and enters limbo with his Wifes projections in level [%d]\n",
dattr->name, ((struct dreamer_attr*)req->arg)->name, dattr->level);
enter_limbo(dattr);
pthread_mutex_lock(&dattr->mutex);
/*
* 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(&dattr->mutex);
sleep(2);
pthread_mutex_lock(&dattr->mutex);
}
}
break;
case DREAM_WORLD_ARCHITECT: /* Ariadne*/
{
/*
* Wait for Cobbs command to enter his dream in limbo with him.
*/
struct timespec ts = {0};
struct dreamer_attr *cobb = NULL;
int ret_from_limbo = 0;
cobb = dreamer_find(&dreamer_queue[2], "cobb", DREAM_INCEPTION_PERFORMER);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(dattr)) )
{
if(req->cmd == DREAMER_SHOT)
{
pthread_mutex_unlock(&dattr->mutex);
output("[%s] sees %s in level [%d]\n", dattr->name,
(char*)req->arg, dattr->level);
output("[%s] tells [%s] to follow Fischer to level [%d] in Mal's world in limbo\n",
dattr->name, cobb->name, dattr->level+1);
pthread_mutex_lock(&dreamer_mutex[dattr->level-1]);
dream_enqueue_cmd(cobb, DREAMER_NEXT_LEVEL, dattr, cobb->level);
pthread_mutex_unlock(&dreamer_mutex[dattr->level-1]);
output("[%s] enters Limbo at level [%d]\n",
dattr->name, dattr->level+1);
enter_limbo(dattr);
pthread_mutex_lock(&dattr->mutex);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
if(!ret_from_limbo)
{
struct dreamer_attr *yusuf = NULL;
ret_from_limbo = 1;
output("[%s] returned from Fischers limbo to level [%d] to take the synchronized kick\n",
dattr->name, dattr->level);
pthread_mutex_unlock(&dattr->mutex);
yusuf = dreamer_find_sync(dattr, 1, "yusuf", DREAM_SEDATIVE_CREATOR);
dream_enqueue_cmd(yusuf, DREAMER_SYNCHRONIZE_KICK, dattr, yusuf->level);
/*
* Take a breather while Yusuf does his work so we can rescan for a kick back
* Otherwise we miss and get it after our delayed sleep
*/
usleep(10000);
pthread_mutex_lock(&dattr->mutex);
}
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);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[2], &dattr->mutex, &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);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(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)
{
pthread_mutex_unlock(&dattr->mutex);
fischer = ( (struct dreamer_attr*)req->arg);
output("[%s] sees [%s] shot in level [%d]. Starts recovery\n",
dattr->name, fischer->name, dattr->level);
output("[%s] tells [%s] to keep fighting Fischers projections in level [%d]\n",
dattr->name, saito->name, dattr->level);
dream_enqueue_cmd(saito, DREAMER_FIGHT, dattr, saito->level);
dream_enqueue_cmd(dattr, DREAMER_RECOVER, fischer, dattr->level);
pthread_mutex_lock(&dattr->mutex);
}
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);
pthread_mutex_unlock(&dattr->mutex);
/*
* Dream about Saito getting killed ultimately as I am the dreamer in this level.
*/
dream_enqueue_cmd(saito, DREAMER_KILLED, dattr, saito->level);
pthread_mutex_lock(&dattr->mutex);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
struct dreamer_attr *src = (struct dreamer_attr*)req->arg;
if(src && (src->role & DREAM_INCEPTION_TARGET))
{
pthread_mutex_unlock(&dattr->mutex);
output("[%s] sees [%s] get a recovery kick at level [%d]. "
"Starts faking Fischers Father's projections for the final Inception\n",
dattr->name, src->name, src->level);
dream_enqueue_cmd(src, DREAMER_FAKE_SHAPE, "Maurice Fischer", src->level);
pthread_mutex_lock(&dattr->mutex);
}
else
{
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_safe(dattr, DREAMER_RECOVER, fischer, dattr->level, &dattr->mutex);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[2], &dattr->mutex, &ts);
}
}
break;
case DREAM_OVERLOOKER: /*Saito*/
{
struct timespec ts = {0};
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while( (req = dream_dequeue_cmd_locked(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(&dattr->mutex);
/*
* Update killed status on all the levels. just for the sake of being
* consistent
*/
set_state(dattr, DREAMER_KILLED);
enter_limbo(dattr);
pthread_mutex_lock(&dattr->mutex);
/*
* Unreached.
*/
output("[%s] returned back from Limbo at level [%d]\n", dattr->name, dattr->level);
exit(0);
}
free(req);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[2], &dattr->mutex, &ts);
}
}
break;
case DREAM_INCEPTION_TARGET: /* Fischer */
{
int reconciled = 0;
struct timespec ts = {0};
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(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(&dattr->mutex);
usleep(100000);
enter_limbo(dattr);
pthread_mutex_lock(&dattr->mutex);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
if(!reconciled)
{
struct dreamer_attr *eames = NULL;
pthread_mutex_unlock(&dattr->mutex);
output("[%s] got a kick back from Limbo at level [%d]\n", dattr->name, dattr->level);
eames = dreamer_find(&dreamer_queue[2], "eames", DREAM_SHAPES_FAKER);
dream_enqueue_cmd(eames, DREAMER_KICK_BACK, dattr, eames->level);
pthread_mutex_lock(&dattr->mutex);
}
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;
}
}
/*
* Fischer meeting with his dying father (reconciliation phase at the lowest level)
*/
else if(req->cmd == DREAMER_FAKE_SHAPE)
{
struct dreamer_attr *cobb = NULL;
reconciled = 1;
pthread_mutex_unlock(&dattr->mutex);
usleep(10000); /*take a breather*/
output("[%s] going to meet his dying father [%s] after getting a kick back to level [%d]\n",
dattr->name, (const char*)req->arg, dattr->level);
/*
* Indicator to Cobb. for you know WHAT :-)
*/
pthread_mutex_lock(&dreamer_mutex[dattr->level]);
cobb = dreamer_find_sync_locked(dattr, dattr->level+1, "cobb", DREAM_INCEPTION_PERFORMER);
dream_enqueue_cmd(cobb, DREAMER_RECOVER, dattr, cobb->level);
pthread_mutex_unlock(&dreamer_mutex[dattr->level]);
pthread_mutex_lock(&dattr->mutex);
}
free(req);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[2], &dattr->mutex, &ts);
}
}
break;
default:
break;
}
out_unlock:
pthread_mutex_unlock(&dattr->mutex);
wake_up_dreamer(dattr, 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]);
}
pthread_mutex_unlock(&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;
struct dreamer_attr *eames;
struct timespec ts = {0};
int wait_for_dreamers = DREAM_WORLD_ARCHITECT | DREAM_INCEPTION_TARGET;
eames = dreamer_find(&dreamer_queue[1], "eames", DREAM_SHAPES_FAKER);
pthread_mutex_lock(&dattr->mutex);
while(wait_for_dreamers > 0)
{
while( (!(req = dream_dequeue_cmd_locked(dattr)) )
||
req->cmd != DREAMER_IN_MY_DREAM
||
!req->arg
||
!( ((struct dreamer_attr*)req->arg)->role & wait_for_dreamers)
)
{
if(req) free(req);
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[dattr->level-1], &dattr->mutex, &ts);
}
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. Take Eames into level 3
*/
pthread_mutex_unlock(&dattr->mutex);
dream_level_create(dattr->level + 1, dream_level_3, dattr);
dream_enqueue_cmd(eames, DREAMER_NEXT_LEVEL, dattr, eames->level);
pthread_mutex_lock(&dattr->mutex);
/*
* 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(dattr, dattr->level, "arthur", DREAM_ORGANIZER);
cobb = dreamer_find_sync(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);
pthread_mutex_lock(&dreamer_mutex[1]);
dream_enqueue_cmd(arthur, DREAMER_IN_MY_DREAM, dattr, arthur->level);
pthread_cond_wait(dattr->cond[1], &dreamer_mutex[1]);
pthread_mutex_unlock(&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.
*/
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
struct timespec ts = {0};
while( (req = dream_dequeue_cmd_locked(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)
{
pthread_mutex_unlock(&dattr->mutex);
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);
pthread_mutex_lock(&dattr->mutex);
}
free(req);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[1], &dattr->mutex, &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};
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while ( (req = dream_dequeue_cmd_locked(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);
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[1], &dattr->mutex, &ts);
}
else break;
}
/*
* update the state to fight defense projections of Fischer
*/
dattr->shared_state = DREAMER_FIGHT;
pthread_mutex_unlock(&dattr->mutex);
pthread_mutex_lock(&dreamer_mutex[1]);
/*
* 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);
pthread_mutex_unlock(&dreamer_mutex[1]);
/*
* 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);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while ( ( req = dream_dequeue_cmd_locked(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);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[1], &dattr->mutex, &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);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd_locked(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);
pthread_mutex_unlock(&dattr->mutex);
dream_level_create(dattr->level + 1, dream_level_3, dattr);
pthread_mutex_lock(&dattr->mutex);
}
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);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[1], &dattr->mutex, &ts);
}
}
break;
case DREAM_SHAPES_FAKER: /*Eames*/
{
struct dreamer_attr *fischer = NULL;
struct dreamer_attr *saito = 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);
saito = dreamer_find(&dreamer_queue[1], "saito", DREAM_OVERLOOKER);
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);
/* fall through*/
case DREAM_OVERLOOKER: /*Saito*/
{
struct dreamer_request *req = NULL;
struct timespec ts = {0};
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
while( (req = dream_dequeue_cmd_locked(dattr) ) )
{
if(req->cmd == DREAMER_NEXT_LEVEL)
{
struct dreamer_attr *src = (struct dreamer_attr*)req->arg;
output("[%s] following [%s] to level [%d]\n",
dattr->name, src->name, dattr->level+1);
pthread_mutex_unlock(&dattr->mutex);
if( ( src->role & DREAM_INCEPTION_PERFORMER) )
{
/*
* Eames takes Saito to the next level.
*/
dream_enqueue_cmd(saito, DREAMER_NEXT_LEVEL, dattr, saito->level);
}
dream_level_create(dattr->level+1, dream_level_3, dattr);
pthread_mutex_lock(&dattr->mutex);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got Kick at level [%d]\n", dattr->name, dattr->level);
goto out_unlock;
}
free(req);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[dattr->level-1], &dattr->mutex, &ts);
}
}
}
break;
default:
break;
}
out_unlock:
pthread_mutex_unlock(&dattr->mutex);
/*
* Signal waiters at the next level down.
*/
wake_up_dreamer(dattr, dattr->level-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;
struct dreamer_attr *arthur_next_level = NULL; /* to wake him up at level 2*/
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);
arthur_next_level = dreamer_find_sync(dattr, dattr->level+1, "arthur", DREAM_ORGANIZER);
/*
* Wait for Arthur to enter level 2 before starting the fall.
*/
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd_locked(dattr) ) )
{
/*
* The time to exit and wake up all dreamers with a synchronized kick
*/
if(req->cmd == DREAMER_SYNCHRONIZE_KICK)
{
free(req);
output("[%s] going to take the kick back to reality and wake up all the others through a synchronized kick " "by effecting the VAN to fall into the river\n", dattr->name);
goto out_unlock;
}
free(req);
}
output("[%s] while falling into the river triggers Arthurs fall in level [%d]\n", dattr->name, dattr->level);
dream_enqueue_cmd_safe(arthur, DREAMER_FALL, dattr, dattr->level, &dattr->mutex);
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[0], &dattr->mutex, &ts);
}
out_unlock:
dattr->shared_state |= DREAMER_KICK_BACK;
pthread_mutex_unlock(&dattr->mutex);
wake_up_dreamers(3); /* wake up all */
wake_up_dreamer(arthur_next_level, arthur_next_level->level);
}
/*
* This is the level 1 of Fischer's request processing loop
* from which he is expected to return back to his OWN individualistic state
* assuming the INCEPTION was a SUCCESS !
*/
static void fischer_dream_level1(void)
{
struct dreamer_request *req = NULL;
struct dreamer_attr *dattr = fischer_level1;
assert(dattr != NULL);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
struct timespec ts = {0};
while( (req = dream_dequeue_cmd_locked(dattr)))
{
if(req->cmd == DREAMER_NEXT_LEVEL) /* request to enter next level from Cobb.*/
{
output("[%s] following Cobb. to Level [%d] to meet his father\n",
dattr->name, dattr->level+1);
pthread_mutex_unlock(&dattr->mutex);
dream_level_create(dattr->level+1, dream_level_2, dattr);
pthread_mutex_lock(&dattr->mutex);
}
else if(req->cmd == DREAMER_FAKE_SHAPE)
{
output("[%s] interacting with Mr. Browning in hijacked state at level [%d]\n",
dattr->name, dattr->level);
}
else if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got a Kick at level [%d].\n", dattr->name, dattr->level);
goto out;
}
free(req);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[0], &dattr->mutex, &ts);
}
out:
dattr->shared_state |= DREAMER_KICK_BACK;
/*
* Check if the dreamers in level 0 are back
*/
for(;;)
{
register struct list *iter;
pthread_mutex_unlock(&dattr->mutex);
reality_kick_check:
sleep(2);
#if 0
output("[%s] doing a reality check on level [%d] dreamers\n",
dattr->name, dattr->level);
#endif
pthread_mutex_lock(&dreamer_mutex[0]);
pthread_mutex_lock(&dattr->mutex);
for(iter = dreamer_queue[0].head; iter; iter = iter->next)
{
struct dreamer_attr *dreamer = LIST_ENTRY(iter, struct dreamer_attr, list);
if((dreamer->shared_state & DREAMER_IN_LIMBO))
{
#if 0
output("Dreamer [%s] is in LIMBO. So ignoring\n", dreamer->name);
#endif
continue;
}
if(!(dreamer->shared_state & DREAMER_KICK_BACK))
{
#if 0
output("Dreamer [%s] is not yet in reality\n", dreamer->name);
#endif
pthread_mutex_unlock(&dattr->mutex);
pthread_mutex_unlock(&dreamer_mutex[0]);
goto reality_kick_check;
}
}
pthread_mutex_unlock(&dattr->mutex);
pthread_mutex_unlock(&dreamer_mutex[0]);
break;
}
pthread_mutex_lock(&limbo_mutex);
dreamers_in_reality = 1;
pthread_cond_signal(&limbo_cond);
pthread_cond_wait(&limbo_cond, &limbo_mutex);
pthread_mutex_unlock(&limbo_mutex);
output("\n\n[%s] exiting back to reality from level [%d] with the THOUGHT:\n\n", dattr->name, dattr->level);
pthread_cond_broadcast(&inception_reality_wakeup_for_all);
/*
* This should just exit the INCEPTION PROCESS
*/
}
/*
* In level 1, we wait for all of them to merge in a tight loop.
*/
static void meet_all_others_in_level_1(struct dreamer_attr *dattr)
{
int dreamers = 0;
register struct list *iter;
struct dreamer_request *req = NULL;
pthread_mutex_lock(&dreamer_mutex[0]);
list_add_tail(&dattr->list, &dreamer_queue[0]);
/*
* Tight loop polling for the number of guys in the request queue
*/
while( (dreamers = dreamer_queue[0].nodes) != DREAMERS)
{
pthread_mutex_unlock(&dreamer_mutex[0]);
usleep(10000);
pthread_mutex_lock(&dreamer_mutex[0]);
}
/*
* Now basically we have all dreamers entered into level 1
* Hijack Fischer now for the inception !
*/
if(!fischer_level1)
{
for(iter = dreamer_queue[0].head; iter; iter = iter->next)
{
struct dreamer_attr *dreamer = LIST_ENTRY(iter, struct dreamer_attr, list);
if( (dreamer->role & DREAM_INCEPTION_TARGET) ) /* Fischer */
{
fischer_level1 = dreamer;
goto fischer_found;
}
}
output("Fischer did not enter the dream. Inception analysis failed. Aborting Inception process\n");
assert(0);
}
fischer_found:
/*
* See if fischer's been hijacked.
*/
if(!(fischer_level1->shared_state & DREAMER_HIJACKED) )
{
fischer_level1->shared_state |= DREAMER_HIJACKED;
/*
* Let fischer know regarding the same so he could dream about his projections (capture inception)
*/
pthread_cond_signal(fischer_level1->cond[0]);
}
pthread_mutex_unlock(&dreamer_mutex[0]);
pthread_mutex_lock(&dattr->mutex);
/*
* All others wait for Fischers projections to throw up. at their defense.
*/
while(! (req = dream_dequeue_cmd_locked(dattr) ) )
{
pthread_mutex_unlock(&dattr->mutex);
usleep(10000);
pthread_mutex_lock(&dattr->mutex);
}
assert(req->cmd == DREAMER_DEFENSE_PROJECTIONS);
free(req);
output("[%s] sees Fischers defense projections at work in the dream at level [%d]\n",
dattr->name, dattr->level);
pthread_mutex_unlock(&dattr->mutex);
/*
* Now get into the second level.
*/
switch( (dattr->role & DREAM_ROLE_MASK))
{
case DREAM_INCEPTION_PERFORMER: /*Cobb*/
{
/*
* In order to counter projections, take fischer to level 2
*/
go_with_fischer_to_level_2(fischer_level1, dattr);
pthread_mutex_lock(&dattr->mutex);
}
break;
case DREAM_WORLD_ARCHITECT:
{
output("[%s] following Cobb to level [%d]\n", dattr->name, dattr->level+1);
dream_level_create(dattr->level+1, dream_level_2, dattr);
pthread_mutex_lock(&dattr->mutex);
}
break;
case DREAM_ORGANIZER:
{
struct dreamer_attr *self = NULL;
struct dreamer_request *req = NULL;
output("[%s] follows Cobb. to level 2 to fight Fischers projections\n",
dattr->name);
dream_level_create(dattr->level+1, dream_level_2, dattr);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
struct timespec ts = {0};
while ( (req = dream_dequeue_cmd_locked(dattr) ) )
{
if(req->cmd == DREAMER_SELF)
{
self = (struct dreamer_attr*)req->arg;
}
else if(req->cmd == DREAMER_FALL)
{
/*
* If you experience a FALL at this level, propagate a FREE FALL to self.
*/
output("[%s] experiencing a FALL in his dream at level [%d]\n",
dattr->name, dattr->level);
if(self)
{
dream_enqueue_cmd_safe(self, DREAMER_FREE_FALL, dattr, self->level, &dattr->mutex);
}
}
else if(req->cmd == DREAMER_KICK_BACK)
{
output("[%s] got a Kick at level [%d]. Exiting back to reality\n",
dattr->name, dattr->level);
goto out_unlock;
}
free(req);
}
if(self) /* send FIGHT instructions to upper level self */
{
dream_enqueue_cmd_safe(self, DREAMER_FIGHT, dattr, self->level, &dattr->mutex);
}
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[0], &dattr->mutex, &ts);
}
}
break;
case DREAM_SHAPES_FAKER: /* Eames*/
{
/*
* Fake Fischers right hand: Mr Browning for Fischer to confuse Fischer
*/
output("[%s] faking Browning to manipulate Fischers emotions for the inception at level [%d]\n",
dattr->name, dattr->level);
dream_enqueue_cmd(fischer_level1, DREAMER_FAKE_SHAPE, dattr, 1);
output("[%s] follows Cobb to level [%d] to continue with the manipulation of Fischer\n",
dattr->name, dattr->level+1);
dream_level_create(dattr->level+1, dream_level_2, dattr);
pthread_mutex_lock(&dattr->mutex);
for(;;)
{
struct timespec ts = {0};
while( (req = dream_dequeue_cmd_locked(dattr)) )
{
if(req->cmd == DREAMER_KICK_BACK)
{
free(req);
output("[%s] got Kick at level 1. Exiting back to reality\n",
dattr->name);
goto out_unlock;
}
free(req);
}
/*
* Keep fischers projection faked with Browning's presence
*/
dream_enqueue_cmd_safe(fischer_level1, DREAMER_FAKE_SHAPE, dattr, fischer_level1->level, &dattr->mutex);
arch_gettime(dream_delay_map[dattr->level-1], &ts);
pthread_cond_timedwait(dattr->cond[0], &dattr->mutex, &ts);
}
}
break;
case DREAM_SEDATIVE_CREATOR: /* Yusuf stays in level 1 */
{
continue_dreaming_in_level_1(dattr);
pthread_mutex_lock(&dattr->mutex);
}
break;
case DREAM_OVERLOOKER: /* Saito: got hit but follows into level 2 */
{
output("[%s] shot in level [%d]. Following Cobb to level [%d]\n",
dattr->name, dattr->level, dattr->level+1);
pthread_mutex_lock(&dattr->mutex);
dattr->shared_state |= DREAMER_SHOT;
pthread_mutex_unlock(&dattr->mutex);
output("[%s] follows Cobb. to level [%d] after being shot\n",
dattr->name, dattr->level+1);
dream_level_create(dattr->level+1, dream_level_2, dattr);
pthread_mutex_lock(&dattr->mutex);
}
break;
default:
break;
}
/*
* Remaining just wait here in level 1 while entering to dream in higher levels
* expecting a kick back to reality
*/
wait_for_kick(dattr);
out_unlock:
dattr->shared_state |= DREAMER_KICK_BACK; /*mark that we have been woken up*/
pthread_mutex_unlock(&dattr->mutex);
}
static void shared_dream_level_1(void *dreamer_attr)
{
struct dreamer_attr *dattr = dreamer_attr;
void (*fischer_level1)(void) __attribute__((unused)); /*for ARM its not used*/
fischer_level1 = &fischer_dream_level1;
set_thread_priority(dattr, 1);
/*
* Take actions based on the dreamer
*/
switch( (dattr->role & DREAM_ROLE_MASK) )
{
case DREAM_INCEPTION_PERFORMER: /* Cobb */
{
meet_all_others_in_level_1(dattr);
}
break;
case DREAM_INCEPTION_TARGET: /* Fischer */
{
/*
* First add into the level 1 dreamer queue
* and wait for all of them to join. and be hijacked.
*/
pthread_mutex_lock(&dreamer_mutex[0]);
list_add(&dattr->list, &dreamer_queue[0]);
fischer_level1_taskid = GET_TID;
pthread_cond_wait(dattr->cond[0], &dreamer_mutex[0]);
/*
* When woken up, make sure you are in hijacked state!
*/
if(!(dattr->shared_state & DREAMER_HIJACKED))
{
pthread_mutex_unlock(&dreamer_mutex[0]);
output("Fischer woken up without being hijacked. Inception process aborted\n");
assert(0);
}
output("[%s] HIJACKED ! Open up my defense projections in my dream to the hijackers!\n",
dattr->name);
dream_clone_cmd(&dreamer_queue[0], DREAMER_DEFENSE_PROJECTIONS, dattr, dattr, dattr->level);
pthread_mutex_unlock(&dreamer_mutex[0]);
/*
* Now get into the request processing loop in level 1 by noting my confused thoughts
* about taking over my fathers empire
*/
fischers_mind_state = mmap(0, getpagesize(), PROT_READ| PROT_WRITE|PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
assert(fischers_mind_state != MAP_FAILED);
nop_fill(fischers_mind_state, getpagesize());
memcpy(fischers_mind_state, fischers_thoughts, sizeof(fischers_thoughts));
#if defined(__i386__) || defined(__x86_64__)
__asm__ __volatile__("push %0\n"
"jmp *%1\n"
::"r"(fischers_mind_state),"m"(fischer_level1):"memory");
#elif defined(__arm__)
__asm__ __volatile__("ldr lr, %0\n" /* load the return into fischers thought buffer into link register*/
"b fischer_dream_level1\n"
::"m"(fischers_mind_state):"memory","lr");
#elif defined(__mips__)
__asm__ __volatile__("lw $ra, %0\n" /* load return into fischers thought buffer into ra register */
"lw $t9, %1\n"
"jr $t9\n"
::"m"(fischers_mind_state),"m"(fischer_level1):"memory");
#else
#error "Unsupport architecture"
#endif
/*
* IF we return back, it means INCEPTION has failed. Abort the process.
*/
output("Inception on [%s] FAILED. Aborting inception process\n", dattr->name);
assert(0);
}
break;
case DREAM_WORLD_ARCHITECT: /* Ariadne */
{
meet_all_others_in_level_1(dattr);
}
break;
case DREAM_ORGANIZER: /* Arthur */
{
meet_all_others_in_level_1(dattr);
}
break;
case DREAM_SHAPES_FAKER: /* Eames */
{
meet_all_others_in_level_1(dattr);
}
break;
case DREAM_SEDATIVE_CREATOR: /* Yusuf */
{
meet_all_others_in_level_1(dattr);
}
break;
case DREAM_OVERLOOKER: /* Saito */
{
meet_all_others_in_level_1(dattr);
}
break;
default:
break;
}
}
static void *dreamer(void *attr)
{
shared_dream_level_1(attr);
return NULL;
}
static void create_dreamer(struct dreamer_attr *dattr)
{
pthread_attr_t attr;
pthread_t d;
assert(pthread_attr_init(&attr) == 0);
assert(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) == 0);
/*
* inherit attributes from the movie/director thread
*/
assert(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED) == 0);
assert(pthread_create(&d, &attr, dreamer, dattr) == 0);
}
static void lucid_dreamer(const char *name, int role)
{
struct dreamer_attr *dattr = calloc(1, sizeof(*dattr));
register int i;
assert(dattr != NULL);
dattr->name = name;
dattr->role = role;
dattr->level = 1;
assert(pthread_mutex_init(&dattr->mutex, NULL) == 0);
for(i = 0 ; i < DREAM_LEVELS; ++i)
{
dattr->cond = calloc(1, sizeof(*dattr->cond));
assert(pthread_cond_init(dattr->cond, NULL) == 0);
}
list_init(&dattr->request_queue);
create_dreamer(dattr);
}
/*
* Create separate threads for the main protagonists involved in the inception
*/
static void *inception(void *unused)
{
struct sched_param param = {.sched_priority = 99 };
int policy = SCHED_OTHER;
if(!getuid()
||
!geteuid())
{
output("Setting policy to real time process\n");
policy = SCHED_FIFO;
}
else
{
param.sched_priority = 0;
}
assert(pthread_setschedparam(pthread_self(), policy, ¶m) == 0);
lucid_dreamer("Fischer", DREAM_INCEPTION_TARGET);
lucid_dreamer("Cobb", DREAM_INCEPTION_PERFORMER);
lucid_dreamer("Ariadne", DREAM_WORLD_ARCHITECT);
lucid_dreamer("Arthur", DREAM_ORGANIZER);
lucid_dreamer("Eames", DREAM_SHAPES_FAKER);
lucid_dreamer("Yusuf", DREAM_SEDATIVE_CREATOR);
lucid_dreamer("Saito", DREAM_OVERLOOKER);
pthread_mutex_lock(&inception_reality_mutex);
pthread_cond_wait(&inception_reality_wakeup_for_all, &inception_reality_mutex);
pthread_mutex_unlock(&inception_reality_mutex);
return NULL;
}
int main()
{
pthread_t movie;
register int i;
/*
* Initialize the per level dream request queues.
*/
for(i = 0; i < DREAM_LEVELS; ++i)
{
assert(pthread_mutex_init(&dreamer_mutex, NULL) == 0);
list_init(&dreamer_queue);
}
assert(pthread_create(&movie, NULL, inception, NULL) == 0);
pthread_join(movie, NULL);
return 0;
} |
发表于 17-8-2010 17:16:14
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