From 953f608b4bad05d7b6882019afadd0292e52dc38 Mon Sep 17 00:00:00 2001
From: Santiago Lo Coco <slococo@itba.edu.ar>
Date: Thu, 28 Oct 2021 23:36:17 -0300
Subject: [PATCH] Add phylo and make some changes (but with some bugs)

Co-authored-by: Ezequiel Bellver <ebellver@itba.edu.ar>
Co-authored-by: Juan Barmasch <jbarmasch@itba.edu.ar>
---
 Kernel/asm/interrupts.asm                     | 182 ++++++++-----
 Kernel/asm/libasm.asm                         |   2 -
 Kernel/drivers/time.c                         |  36 ++-
 Kernel/include/scheduler.h                    |   3 +-
 Kernel/include/schedulerLib.h                 |   4 +-
 Kernel/include/time.h                         |   1 +
 Kernel/interruptions/systemCallsDispatcher.c  |  32 ++-
 Kernel/loader.asm                             |   9 +-
 Kernel/utils/memManagerFRT4.c                 |   2 +-
 Kernel/utils/scheduler.c                      | 197 +++++++++++---
 Userland/SampleCodeModule/Makefile            |  10 +-
 Userland/SampleCodeModule/asm/libasm.asm      | 170 ++++++++++++-
 Userland/SampleCodeModule/bottler/bottler.c   |  41 +++
 .../bottler/include/bottler.h                 |   9 +
 Userland/SampleCodeModule/include/libc.h      |   2 +
 Userland/SampleCodeModule/include/system.h    |  26 +-
 Userland/SampleCodeModule/libc.c              |   8 +
 Userland/SampleCodeModule/sampleCodeModule.c  |   9 +-
 .../SampleCodeModule/shell/commands/block.c   |  12 +
 .../SampleCodeModule/shell/commands/kill.c    |  12 +
 .../SampleCodeModule/shell/commands/loop.c    |  13 +
 .../SampleCodeModule/shell/commands/nice.c    |   4 +-
 .../SampleCodeModule/shell/commands/phylo.c   | 240 ++++++++++++++++++
 .../shell/commands/printmem.c                 |   2 +-
 .../shell/commands/quadratic.c                |   6 +-
 .../SampleCodeModule/shell/commands/unblock.c |  12 +
 .../SampleCodeModule/shell/include/block.h    |  11 +
 .../SampleCodeModule/shell/include/kill.h     |  11 +
 .../SampleCodeModule/shell/include/loop.h     |  11 +
 .../SampleCodeModule/shell/include/phylo.h    |   9 +
 .../SampleCodeModule/shell/include/unblock.h  |  11 +
 Userland/SampleCodeModule/shell/shell.c       |  14 +-
 32 files changed, 979 insertions(+), 132 deletions(-)
 create mode 100644 Userland/SampleCodeModule/bottler/bottler.c
 create mode 100644 Userland/SampleCodeModule/bottler/include/bottler.h
 create mode 100644 Userland/SampleCodeModule/shell/commands/block.c
 create mode 100644 Userland/SampleCodeModule/shell/commands/kill.c
 create mode 100644 Userland/SampleCodeModule/shell/commands/loop.c
 create mode 100644 Userland/SampleCodeModule/shell/commands/phylo.c
 create mode 100644 Userland/SampleCodeModule/shell/commands/unblock.c
 create mode 100644 Userland/SampleCodeModule/shell/include/block.h
 create mode 100644 Userland/SampleCodeModule/shell/include/kill.h
 create mode 100644 Userland/SampleCodeModule/shell/include/loop.h
 create mode 100644 Userland/SampleCodeModule/shell/include/phylo.h
 create mode 100644 Userland/SampleCodeModule/shell/include/unblock.h

diff --git a/Kernel/asm/interrupts.asm b/Kernel/asm/interrupts.asm
index 28c1f21..1a3b141 100755
--- a/Kernel/asm/interrupts.asm
+++ b/Kernel/asm/interrupts.asm
@@ -28,9 +28,10 @@ EXTERN nextProcess
 GLOBAL switchContext
 GLOBAL loadProcess
 GLOBAL _initialize_stack_frame
-GLOBAL _switchContext
+GLOBAL _switchContext, forceTimerAux
 
 EXTERN getFPUaddress, getSSEaddress
+EXTERN checkSleeping
 
 SECTION .text
 
@@ -109,6 +110,40 @@ SECTION .text
 	iretq
 %endmacro
 
+%macro pushStateNoRax 0
+	push rbx
+	push rcx
+	push rdx
+	push rbp
+	push rdi
+	push rsi
+	push r8
+	push r9
+	push r10
+	push r11
+	push r12
+	push r13
+	push r14
+	push r15
+%endmacro
+
+%macro popStateNoRax 0
+	pop r15
+	pop r14
+	pop r13
+	pop r12
+	pop r11
+	pop r10
+	pop r9
+	pop r8
+	pop rsi
+	pop rdi
+	pop rbp
+	pop rdx
+	pop rcx
+	pop rbx
+%endmacro
+
 _hlt:
 	sti
 	hlt
@@ -167,18 +202,29 @@ picSlaveMask:
 ; 	pop rcx
 ; 	ret
 
+forceTimerAux:
+	pushStateNoRax
+
+	; call checkSleeping
+
+	call nextProcess
+	mov rsp, rax
+
+	popStateNoRax
+	iretq
+
 ;8254 Timer (Timer Tick)
 _irq00Handler:
 	pushState
 
-	mov rsi, rsp
-	and rsp, -16
-	sub rsp, 108
-	fsave [rsp]
-	and rsp, -16
-	sub rsp, 512
-	fxsave [rsp]
-	push rsi
+	; mov rsi, rsp
+	; and rsp, -16
+	; sub rsp, 108
+	; fsave [rsp]
+	; and rsp, -16
+	; sub rsp, 512
+	; fxsave [rsp]
+	; push rsi
 
 	; push rax
 	; call getFPUaddress
@@ -189,11 +235,14 @@ _irq00Handler:
 	; fsave [bytesForFPU]
 	; fxsave [bytesForSSEAligned]
 
-	mov rdi, 0
-	call irqDispatcher
+	call checkSleeping
 
 	mov rdi, rsp
 	call updateRSP
+	mov r10, rax
+
+	mov rdi, 0
+	call irqDispatcher
 
 	call nextProcess
 	mov rsp, rax
@@ -209,19 +258,25 @@ _irq00Handler:
 	; call getSSEaddress
 	; fxrstor [rax]
 	; pop rax
+
+	; cmp r10, 0
+	; je .end
 	
-	pop rsp
-	mov rax, rsp
-	and rsp, -16
-	sub rsp, 108
-	frstor [rsp]
-	and rsp, -16
-	sub rsp, 512
-	fxrstor [rsp]
-	mov rsp, rax
+	; pop rsp
+	; mov rax, rsp
+	; and rsp, -16
+	; sub rsp, 108
+	; frstor [rsp]
+	; and rsp, -16
+	; sub rsp, 512
+	; fxrstor [rsp]
+	; mov rsp, rax
 
 	popState
 	iretq
+; .end:
+; 	popStateNoRax
+; 	iretq
 
 ;Keyboard
 _irq01Handler:
@@ -257,39 +312,6 @@ haltcpu:
 	cli
 	ret
 
-%macro pushStateNoRax 0
-	push rbx
-	push rcx
-	push rdx
-	push rbp
-	push rdi
-	push rsi
-	push r8
-	push r9
-	push r10
-	push r11
-	push r12
-	push r13
-	push r14
-	push r15
-%endmacro
-
-%macro popStateNoRax 0
-	pop r15
-	pop r14
-	pop r13
-	pop r12
-	pop r11
-	pop r10
-	pop r9
-	pop r8
-	pop rsi
-	pop rdi
-	pop rbp
-	pop rdx
-	pop rcx
-	pop rbx
-%endmacro
 
 _initialize_stack_frame:
     mov r10, rsp
@@ -306,15 +328,15 @@ _initialize_stack_frame:
 
     pushState
 
-	mov rsi, rsp
-	and rsp, -16
-	sub rsp, 108
-	fsave [rsp]
-	and rsp, -16
-	sub rsp, 512
-	fxsave [rsp]
-	push rsi
-	mov rax, rsp
+	; mov rsi, rsp
+	; and rsp, -16
+	; sub rsp, 108
+	; fsave [rsp]
+	; and rsp, -16
+	; sub rsp, 512
+	; fxsave [rsp]
+	; push rsi
+	; mov rax, rsp
 
 	; fsave [bytesForFPU]
 	; fxsave [bytesForSSEAligned]
@@ -335,13 +357,39 @@ _initialize_stack_frame:
 ; System calls (int 80h)
 _systemCallsHandler:
 	pushStateNoRax
-	fsave [bytesForFPU]
-	fxsave [bytesForSSEAligned]
+	; fsave [bytesForFPU]
+	; fxsave [bytesForSSEAligned]
+	; mov [auxRSI], rsi
+	; mov rsi, rsp
+	; and rsp, -16
+	; sub rsp, 108
+	; fsave [rsp]
+	; and rsp, -16
+	; sub rsp, 512
+	; fxsave [rsp]
+	; push rsi
 
+	; mov [auxRDI], rdi
+	; mov rdi, rsp
+	; call updateRSP
+
+	; mov rsi, [auxRSI]
+	; mov rdi, [auxRDI]
 	call systemCallsDispatcher
 
-	fxrstor [bytesForSSEAligned]
-	frstor [bytesForFPU]
+	; fxrstor [bytesForSSEAligned]
+	; frstor [bytesForFPU]
+
+	; pop rsp
+	; mov rax, rsp
+	; and rsp, -16
+	; sub rsp, 108
+	; frstor [rsp]
+	; and rsp, -16
+	; sub rsp, 512
+	; fxrstor [rsp]
+	; mov rsp, rax
+
 	popStateNoRax
 	iretq
 
@@ -360,4 +408,6 @@ SECTION .bss
 	; bytesForFPU2 resb 108
 	insPointer resb 8
 	rspPointer resb 8
+	auxRSI resb 8
+	auxRDI resb 8
 	; auxi resb 4
\ No newline at end of file
diff --git a/Kernel/asm/libasm.asm b/Kernel/asm/libasm.asm
index 82e1fc7..5539fea 100644
--- a/Kernel/asm/libasm.asm
+++ b/Kernel/asm/libasm.asm
@@ -6,9 +6,7 @@ forceTimer:
 	int 20h
 	ret
 
-; tiene que ser uint32_t el parametro, no soporta más xchg. aunq también podría ser menos
 enter_region:
-	;push eax no haría falta pues lo podemos perder...
 	mov eax, 1
 	xchg eax, [rdi]
 	cmp eax, 0
diff --git a/Kernel/drivers/time.c b/Kernel/drivers/time.c
index 65fcdbe..f4adc66 100755
--- a/Kernel/drivers/time.c
+++ b/Kernel/drivers/time.c
@@ -35,9 +35,43 @@ int getTime(char option) {
 
 // TODO
 void wait(long seconds) {
-	// int initialSeconds = getTime(SECONDS);
+	int initialSeconds = getTimeGen(SECONDS);
+	int initialMinutes = getTimeGen(MINUTES);
+	int runSeconds = 0;
+	if (initialSeconds + seconds >= 60) {
+
+	}
+	int newSeconds = 0;
+	while ((newSeconds = getTimeGen(SECONDS) - initialSeconds) < seconds)
+		haltcpu();
 	// while (initialSeconds - seconds != initialSeconds) {
 
 	// }
 	// while (seconds_elapsed() < seconds);
+}
+
+static long getTimeFrom2000() {
+	long years = 00 * 31557600;
+	long months = 1 * 2629800;
+	long days = 1 * 86400;
+
+	long aux = years + months + days;
+
+	return years + months + days;
+}
+
+long getTimeOfDay() {
+	// long years = getTimeGen(YEAR) - 1970;
+
+	// obtengo los segundos actuales (sumando todas las variables) y los resto por los de 1970?
+	long years = getTimeGen(YEAR) * 31557600;
+	long months = getTimeGen(MONTH) * 2629800;
+	long days = getTimeGen(DAY) * 86400;
+	long hours = getTimeGen(HOURS) * 3600;
+	long minutes = getTimeGen(MINUTES) * 60;
+	long seconds = getTimeGen(SECONDS);
+
+	long total = years + months + days + hours + minutes + seconds;
+
+	return total - getTimeFrom2000();
 }
\ No newline at end of file
diff --git a/Kernel/include/scheduler.h b/Kernel/include/scheduler.h
index 799084e..e032841 100644
--- a/Kernel/include/scheduler.h
+++ b/Kernel/include/scheduler.h
@@ -4,6 +4,7 @@
 #include "memManager.h"
 #include <stdlib.h>
 #include "lib.h"
+#include "time.h"
 #include <stddef.h>
 #include "schedulerLib.h"
 
@@ -23,7 +24,7 @@ typedef struct processCDT * processADT;
 void idle();
 void newProcess(processADT process, char * name, char priority, char foreground, uint64_t rsp, uint64_t rbp);
 uint64_t nextProcess();
-void updateRSP(uint64_t newRsp);
+char updateRSP(uint64_t newRsp);
 char getProcessData(char * out, processADT proc);
 
 #endif
\ No newline at end of file
diff --git a/Kernel/include/schedulerLib.h b/Kernel/include/schedulerLib.h
index f3ab205..86b5e28 100644
--- a/Kernel/include/schedulerLib.h
+++ b/Kernel/include/schedulerLib.h
@@ -4,7 +4,7 @@
 #include <stdint.h>
 
 void initScheduler();
-void enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd);
+int enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd);
 char block(int pid);
 char unblock(int pid);
 char kill(int pid);
@@ -15,5 +15,7 @@ char quitCPU();
 char * processes();
 int getFdOut();
 int getFdIn();
+void checkSleeping();
+char unblockFirst(int pid);
 
 #endif
\ No newline at end of file
diff --git a/Kernel/include/time.h b/Kernel/include/time.h
index 1c2e989..936c2ee 100755
--- a/Kernel/include/time.h
+++ b/Kernel/include/time.h
@@ -15,5 +15,6 @@ int seconds_elapsed();
 int getTimeGen(char option);
 int getTime(char option);
 void wait(long seconds);
+long getTimeOfDay();
 
 #endif
diff --git a/Kernel/interruptions/systemCallsDispatcher.c b/Kernel/interruptions/systemCallsDispatcher.c
index f4ad6a1..f464ef6 100644
--- a/Kernel/interruptions/systemCallsDispatcher.c
+++ b/Kernel/interruptions/systemCallsDispatcher.c
@@ -5,9 +5,11 @@
 void exitProcess();
 // void setFn(uint64_t, uint64_t, uint64_t);
 char * processes();
-void enqueueProcess(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
+// int enqueueProcess(uint64_t, uint64_t, uint64_t, uint64_t, uint64_t);
 char openPipe(int *, char *);
 char nice(int, char);
+#include "semLib.h"
+#include "schedulerLib.h"
 
 uint64_t systemCallsDispatcher(uint64_t rdi, uint64_t rsi, uint64_t rdx, uint64_t rcx, uint64_t r8, uint64_t r9) {
 	switch (rdi) {
@@ -18,9 +20,7 @@ uint64_t systemCallsDispatcher(uint64_t rdi, uint64_t rsi, uint64_t rdx, uint64_
         case 2:
             return getTime(rsi, rdx, rcx);
         case 3:
-            // createProcess(rsi);
-            enqueueProcess(rsi, rdx, rcx, r8, r9);
-            break;
+            return enqueueProcess(rsi, rdx, rcx, r8, r9);
         case 4:
             exitProcess();
             break;
@@ -32,7 +32,7 @@ uint64_t systemCallsDispatcher(uint64_t rdi, uint64_t rsi, uint64_t rdx, uint64_
         case 7:
             return (uint64_t) getSems();
         case 8:
-            return pvPortMalloc((void *) rsi);
+            return pvPortMalloc((size_t) rsi);
         case 9:
             vPortFree((void *) rsi);
             break;
@@ -40,6 +40,28 @@ uint64_t systemCallsDispatcher(uint64_t rdi, uint64_t rsi, uint64_t rdx, uint64_
             return (uint64_t) openPipe(rsi, rdx);
         case 11:
             return nice(rsi, rdx);
+        case 12:
+            sleep(rsi);
+            break;
+        case 13:
+            semWait((sem_t *) rsi);
+            break;
+        case 14:
+            semPost((sem_t *) rsi);
+            break;
+        case 15:
+            return semOpen(rsi, rdx);
+        case 16:
+            kill(rsi);
+            break;
+        case 17:
+            return getPid();
+        case 18:
+            return semClose((sem_t *) rsi);
+        case 19:
+            return block(rsi);
+        case 20:
+            return unblock(rsi);
         default:
             return -1;
 	}
diff --git a/Kernel/loader.asm b/Kernel/loader.asm
index fa47763..52799bc 100644
--- a/Kernel/loader.asm
+++ b/Kernel/loader.asm
@@ -6,7 +6,8 @@ loader:
 	call initializeKernelBinary	; Set up the kernel binary, and get thet stack address
 	mov rsp, rax				; Set up the stack with the returned address
 	call main
-hang:
-	cli
-	hlt	; halt machine should kernel return
-	jmp hang
+
+;	hang:
+;		cli
+;		hlt	; halt machine should kernel return
+;		jmp hang
diff --git a/Kernel/utils/memManagerFRT4.c b/Kernel/utils/memManagerFRT4.c
index 0c15cc0..c7215ec 100644
--- a/Kernel/utils/memManagerFRT4.c
+++ b/Kernel/utils/memManagerFRT4.c
@@ -22,7 +22,7 @@ typedef unsigned long UBaseType_t;
 
 #define configSUPPORT_STATIC_ALLOCATION         1
 #define configSUPPORT_DYNAMIC_ALLOCATION        1
-#define configTOTAL_HEAP_SIZE                   1024 * 1024 * 100
+#define configTOTAL_HEAP_SIZE                   1024 * 1024 * 512
 #define configAPPLICATION_ALLOCATED_HEAP        0
 #define portBYTE_ALIGNMENT 8
 // #define portBYTE_ALIGNMENT 16
diff --git a/Kernel/utils/scheduler.c b/Kernel/utils/scheduler.c
index b453ad4..f04f7b8 100644
--- a/Kernel/utils/scheduler.c
+++ b/Kernel/utils/scheduler.c
@@ -37,6 +37,13 @@ typedef struct processCDT {
     // void * fpuBytes;
 } processCDT;
 
+typedef struct sleepCDT {
+    int pid;
+    long time;
+    long secs;
+    struct sleepCDT * next;
+} sleepCDT;
+
 // typedef union processCDT {
 //  struct {
 //     struct p * next;
@@ -60,16 +67,20 @@ processCDT * firstReady = NULL;
 processCDT * lastReady = NULL;
 processCDT * firstBlocked = NULL;
 processCDT * lastBlocked = NULL;
+sleepCDT * firstSleep = NULL;
 
 static processCDT * currentProcess = NULL;
 static int pids = IDLE_PID;
 static char update = 1;
+static char idleFlag = 2;
 
 uint64_t nextProcess() {
     update = 1;
     if (currentProcess == NULL) {
-        if (firstReady == NULL)
+        if (firstReady == NULL) {
+            idleFlag = 2;
             unblock(IDLE_PID);
+        }
 
         currentProcess = firstReady;
         return firstReady->rsp;
@@ -94,7 +105,7 @@ void idle() {
 }
 
 void initScheduler() {
-    char * argv[] = {"Idle"};
+    char * argv[] = {"idle"};
     enqueueProcess(idle, 0, 1, argv, NULL);
 }
 
@@ -104,7 +115,7 @@ void initScheduler() {
 // }
 
 // void enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[]) {
-void enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd) {
+int enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd) {
     if (fd == NULL) {
         int * aux = pvPortMalloc(2 * sizeof(int));
         aux[0] = 0;
@@ -148,7 +159,8 @@ void enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *
     // _initialize_stack_frame(fn, rbp, argc, argv, &(process->fpuBytes), &(process->sseBytes));
     // _initialize_stack_frame(fn, rbp, argc, argv, &(process->bytes->s.sseBytes), &(process->bytes->s.fpuBytes));
     // _initialize_stack_frame(fn, rbp, argc, argv, process->bytes->s.sseBytes, process->bytes->s.fpuBytes);
-    process->rsp = _initialize_stack_frame(fn, rbp, argc, argv);
+    // process->rsp = _initialize_stack_frame(fn, rbp, argc, argv);
+    _initialize_stack_frame(fn, rbp, argc, argv);
 
     if (firstReady == NULL)
         firstReady = process;
@@ -156,7 +168,59 @@ void enqueueProcess(void (*fn) (int, char **), char foreground, int argc, char *
         lastReady->next = process;
     lastReady = process;
         
-    return;
+    return process->pid;
+}
+
+void removeProcess(processCDT * del, processCDT * prev, processCDT ** first, processCDT ** last) {
+    if (prev == NULL) {
+        *first = del->next;
+        if (*last == del)
+            *last = NULL;
+    }
+    else {
+        prev->next = del->next;
+        if (*last == del)
+            *last = prev;
+    }
+}
+
+void sleep(int secs) {
+    if (currentProcess == NULL)
+        return;
+
+    sleepCDT * proc = pvPortMalloc(sizeof(sleepCDT));
+    proc->pid = currentProcess->pid;
+    proc->secs = secs;
+    proc->time = getTimeOfDay();
+    proc->next = firstSleep;
+    firstSleep = proc;
+
+    block(currentProcess->pid);
+}
+
+void wakeUp(sleepCDT * wake, sleepCDT * prev) {
+    if (wake == firstSleep)
+        firstSleep = wake->next;
+    else {
+        prev->next = wake->next;
+    }
+    unblockFirst(wake->pid);
+    vPortFree(wake);
+}
+
+void checkSleeping() {
+    sleepCDT * prev = NULL;
+    sleepCDT * aux = firstSleep;
+    while(aux != NULL) {
+        if (getTimeOfDay() >= aux->time + aux->secs) {
+            wakeUp(aux, prev);
+            aux = prev->next;
+        }
+        else {
+            prev = aux;
+            aux = aux->next;
+        }
+    }
 }
 
 // void * getSSEaddress() {
@@ -195,10 +259,17 @@ char block(int pid) {
     if (del == NULL)
         return EXIT_FAILURE;
     else {
-        if (prev != NULL)
-            prev->next = del->next;
-        else
-            firstReady = del->next;
+        removeProcess(del, prev, &firstReady, &lastReady);
+//        if (prev != NULL) {
+//            prev->next = del->next;
+//            if (lastReady == del)
+//                lastReady = prev;
+//        }
+//        else {
+//            firstReady = del->next;
+//            if (del == lastReady)
+//                lastReady = NULL;
+//        }
     }
 
     processCDT * next = del->next;
@@ -225,17 +296,70 @@ char unblock(int pid) {
     if (del == NULL)
         return EXIT_FAILURE;
     else {
-        if (prev != NULL)
-            prev->next = del->next;
-        else
-            firstBlocked = del->next;
-        del->next = NULL;
-        if (lastReady != NULL)
-            lastReady->next = del;
-        else
-            firstReady = del;
-        lastReady = del;
+        removeProcess(del, prev, &firstBlocked, &lastBlocked);
+//        if (prev != NULL) {
+//            prev->next = del->next;
+//            if (del == lastBlocked)
+//                lastBlocked = prev;
+//        }
+//        else {
+//            firstBlocked = del->next;
+//            if (lastBlocked == del)
+//                lastBlocked = NULL;
+//        }
     }
+
+    del->next = NULL;
+    if (lastReady != NULL)
+        lastReady->next = del;
+    else
+        firstReady = del;
+    lastReady = del;
+
+    // if (firstReady != NULL && firstReady->pid == IDLE_PID && lastReady->pid != IDLE_PID)
+    if (idleFlag && !(--idleFlag))
+        block(IDLE_PID);
+    
+    return EXIT_SUCCESS;
+}
+
+char unblockFirst(int pid) {
+    processADT prev = NULL;
+    processADT del = searchProcess(&prev, pid, firstBlocked);
+    if (del == NULL)
+        return EXIT_FAILURE;
+    else {
+        removeProcess(del, prev, &firstBlocked, &lastBlocked);
+//        if (prev != NULL) {
+//            prev->next = del->next;
+//            if (lastBlocked == del)
+//                lastBlocked = prev;
+//        }
+//        else {
+//            firstBlocked = del->next;
+//            if (lastBlocked == del)
+//                lastBlocked = NULL;
+//        }
+    }
+    
+    if (currentProcess != NULL) {
+        del->next = currentProcess->next;
+        currentProcess->next = del;
+        if (lastReady == currentProcess)
+            lastReady = del;
+    }
+    else {
+        if (firstReady != NULL)
+            del->next = firstReady->next;
+        else del->next = NULL;
+        firstReady = del;
+        if (lastReady == NULL)
+            lastReady = del;
+    }
+
+    // if (firstReady != NULL && lastReady->pid == IDLE_PID && firstReady->pid != IDLE_PID)
+    if (idleFlag && !(--idleFlag))
+        block(IDLE_PID);
     
     return EXIT_SUCCESS;
 }
@@ -248,23 +372,25 @@ char kill(int pid) {
         if (del == NULL)
             return EXIT_FAILURE;
         else {
-            if (prev != NULL) {
-                prev->next = del->next;
-                if (del == lastBlocked)
-                    lastBlocked = prev;
-            }
-            else
-                firstBlocked = del->next;
+            removeProcess(del, prev, &firstBlocked, &lastBlocked);
+            // if (prev != NULL) {
+            //     prev->next = del->next;
+            //     if (del == lastBlocked)
+            //         lastBlocked = prev;
+            // }
+            // else
+            //     firstBlocked = del->next;
         }
     }
     else {
-        if (prev != NULL) {
-            prev->next = del->next;
-            if (del == lastReady)
-                lastReady = prev;
-        }
-        else
-            firstReady = del->next;
+        removeProcess(del, prev, &firstReady, &lastReady);
+        // if (prev != NULL) {
+        //     prev->next = del->next;
+        //     if (del == lastReady)
+        //         lastReady = prev;
+        // }
+        // else
+        //     firstReady = del->next;
     }
 
     processCDT * next = del->next;
@@ -317,12 +443,13 @@ char nice(int pid, char offset) {
     return EXIT_SUCCESS;
 }
 
-void updateRSP(uint64_t newRsp) {
+char updateRSP(uint64_t newRsp) {
     if (currentProcess == NULL) {
-        return;
+        return -1;
     }
     if (update)
         currentProcess->rsp = newRsp;
+    return update;
 }
 
 int getPid() {
diff --git a/Userland/SampleCodeModule/Makefile b/Userland/SampleCodeModule/Makefile
index d7e45b5..ead40ab 100644
--- a/Userland/SampleCodeModule/Makefile
+++ b/Userland/SampleCodeModule/Makefile
@@ -6,12 +6,14 @@ SOURCES=$(wildcard *.c)
 SOURCES_SHELL=$(wildcard shell/*.c)
 SOURCES_ASM=$(wildcard asm/*.asm)
 SOURCES_PROMPT=$(wildcard shell/commands/*.c)
+SOURCES_BOTTLER=$(wildcard bottler/*.c)
 OBJECTS=$(SOURCES:.c=.o)
 OBJECTS_SHELL=$(SOURCES_SHELL:.c=.o)
 OBJECTS_PROMPT=$(SOURCES_PROMPT:.c=.o)
+OBJECTS_BOTTLER=$(SOURCES_BOTTLER:.c=.o)
 OBJECTS_ASM=$(SOURCES_ASM:.asm=.o)
 
-ALL_OBJECTS= $(OBJECTS) $(OBJECTS_ASM) $(OBJECTS_SHELL) $(OBJECTS_COMMANDS) $(OBJECTS_PROMPT)
+ALL_OBJECTS= $(OBJECTS) $(OBJECTS_ASM) $(OBJECTS_SHELL) $(OBJECTS_COMMANDS) $(OBJECTS_PROMPT) $(OBJECTS_BOTTLER)
 
 STATICLIBS=
 
@@ -21,13 +23,13 @@ all: $(MODULE) $(MODULE_ELF) #shellModule
 #	cd shell; make
 
 $(MODULE): $(STATICLIBS) $(ALL_OBJECTS)
-	$(LD) $(LDFLAGS) -T sampleCodeModule.ld $(OBJECTS) $(OBJECTS_SHELL) $(OBJECTS_ASM) $(OBJECTS_PROMPT) -o ../$(MODULE)
+	$(LD) $(LDFLAGS) -T sampleCodeModule.ld $(OBJECTS) $(OBJECTS_SHELL) $(OBJECTS_ASM) $(OBJECTS_PROMPT) $(OBJECTS_BOTTLER) -o ../$(MODULE)
 
 $(MODULE_ELF): $(STATICLIBS) $(ALL_OBJECTS)
-	$(LD) $(LDFLAGS) -I./include -I./shell/include -T sampleCodeModule.ld --oformat=elf64-x86-64 $(OBJECTS) $(OBJECTS_SHELL) $(OBJECTS_ASM) $(OBJECTS_PROMPT) -o ../$(MODULE_ELF)
+	$(LD) $(LDFLAGS) -I./include -I./shell/include -I./bottler/include -T sampleCodeModule.ld --oformat=elf64-x86-64 $(OBJECTS) $(OBJECTS_SHELL) $(OBJECTS_ASM) $(OBJECTS_PROMPT) $(OBJECTS_BOTTLER) -o ../$(MODULE_ELF)
 
 %.o:%.c
-	$(GCC) $(GCCFLAGS) -T _loader.c -I./include -I./shell/include -c $< -o $@
+	$(GCC) $(GCCFLAGS) -T _loader.c -I./include -I./shell/include -I./bottler/include -c $< -o $@
 
 %.o:%.asm
 	$(ASM) $(ASMFLAGS) $< -o $@
diff --git a/Userland/SampleCodeModule/asm/libasm.asm b/Userland/SampleCodeModule/asm/libasm.asm
index e3a7607..dda0ecd 100644
--- a/Userland/SampleCodeModule/asm/libasm.asm
+++ b/Userland/SampleCodeModule/asm/libasm.asm
@@ -3,7 +3,8 @@ GLOBAL _getMem, sys_loadProcess
 GLOBAL raiseOpcodeExc
 GLOBAL _getRegs, sys_switchContext
 GLOBAL cpu_id, cpu_id_support
-GLOBAL sys_exit, sys_ps, sys_free, sys_malloc, sys_sem, sys_openPipe, sys_nice
+GLOBAL sys_exit, sys_ps, sys_free, sys_malloc, sys_sem, sys_openPipe, sys_semClose
+GLOBAL sys_nice, sys_semWait, sys_semPost, sys_semOpen, sys_sleep, sys_kill, sys_getPid, sys_block, sys_unblock
 
 section .text
 
@@ -81,10 +82,48 @@ sys_exit:
     mov rbp, rsp
 
 	push rdi
+	push rsi
 
 	mov rdi, 4
 	int 80h
 
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_block:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 19
+	int 80h
+
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_unblock:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 20
+	int 80h
+
+	pop rsi
 	pop rdi
 
     mov rsp, rbp
@@ -96,10 +135,13 @@ sys_malloc:
     mov rbp, rsp
 
 	push rdi
+	push rsi
 
+	mov rsi, rdi
 	mov rdi, 8
 	int 80h
 
+	pop rsi
 	pop rdi
 
     mov rsp, rbp
@@ -199,6 +241,21 @@ sys_sem:
     pop rbp
     ret
 
+sys_getPid:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+
+	mov rdi, 17
+	int 80h
+
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
 sys_nice:
     push rbp
     mov rbp, rsp
@@ -220,6 +277,117 @@ sys_nice:
     pop rbp
     ret
 
+sys_semOpen:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+	push rdx
+
+	mov rdx, rsi
+	mov rsi, rdi
+	mov rdi, 15
+	int 80h
+
+	pop rdx
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_semWait:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 13
+	int 80h
+
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_semPost:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 14
+	int 80h
+
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_semClose:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 18
+	int 80h
+
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_sleep:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 12
+	int 80h
+
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
+sys_kill:
+    push rbp
+    mov rbp, rsp
+
+	push rdi
+	push rsi
+
+	mov rsi, rdi
+	mov rdi, 16
+	int 80h
+
+	pop rsi
+	pop rdi
+
+    mov rsp, rbp
+    pop rbp
+    ret
+
 _getMem:
 	push rbp
 	mov rbp, rsp
diff --git a/Userland/SampleCodeModule/bottler/bottler.c b/Userland/SampleCodeModule/bottler/bottler.c
new file mode 100644
index 0000000..d807b1e
--- /dev/null
+++ b/Userland/SampleCodeModule/bottler/bottler.c
@@ -0,0 +1,41 @@
+#include "bottler.h"
+
+void bottler(int argc, char ** argv) {
+	printStringLen("                                                                             ", 80); new_line();
+    printStringLen("                                   (%(                                     ", 80); new_line();
+	printStringLen( "      Welcome to", 17);
+    printStringLen("                  %%%%%                                      ", 80); new_line();
+	printStringLen( "        BottlerOS", 18);
+    printStringLen("                  %%%                                      ", 80); new_line();
+    printStringLen( "                              %%%%%%%%%%%%%                                 ", 80); new_line();
+    printStringLen( "                          %%%%%%%%%%%%%%%%%%%%%                             ", 80); new_line();
+    printStringLen( "                        %%%%%%%           %%%%%%%                           ", 80); new_line();
+    printStringLen( "                      %%%%%                   %%%%%                         ", 80); new_line();
+    printStringLen( "                     %%%%%                     %%%%%                        ", 80); new_line();
+    printStringLen( "                    %%%%% ", 27); 
+	printStringLen( " %%%%           %%%% ", 22); 
+	printStringLen( " %%%%%                       ", 30); new_line();
+    printStringLen( "                    %%%%%  ", 28); 
+	printStringLen( " (%             %(  ", 21); 
+	printStringLen( " %%%%%                       ", 30); new_line();
+    printStringLen( "                    %%%%%%%                   %%%%%%%                       ", 80); new_line();
+    printStringLen("                    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%                       ", 80); new_line();
+    printStringLen("                 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%                    ", 80); new_line();
+    printStringLen("                %%%%%%%%%%%%%%%%%%%%%%% ", 41); 
+	printStringLen( " %  %* ", 8); 
+	printStringLen(" %%%%%%%%%                   ", 30); new_line();
+    printStringLen("                %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%                   ", 80); new_line();
+    printStringLen("                %%**%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/%%                   ", 80); new_line();
+    printStringLen("                %%* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% /%%                   ", 80); new_line();
+    printStringLen("                %%* %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% /%%                   ", 80); new_line();
+    printStringLen("                %%%  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%  %%%                   ", 80); new_line();
+    printStringLen( "              ,%%%%%   %%%%%%%%%%%%%%%%%%%%%%%%%%%   %%%%%.                 ", 80); new_line();
+    printStringLen( "                %%.         %%%%%%%%%%%%%%%%%         .%%                   ", 80); new_line();
+    printStringLen( "                              %%%%%%%%%%%%%                                 ", 80); new_line();
+    printStringLen( "                                 %%%%%%%                                    ", 80); new_line();
+    printStringLen( "                                                                            ", 80); new_line();
+	// sys_sleep(3);
+	
+	winClear();
+    sys_exit();
+}
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/bottler/include/bottler.h b/Userland/SampleCodeModule/bottler/include/bottler.h
new file mode 100644
index 0000000..546ba9f
--- /dev/null
+++ b/Userland/SampleCodeModule/bottler/include/bottler.h
@@ -0,0 +1,9 @@
+#ifndef BOTTLER_LIB
+#define BOTTLER_LIB
+
+#include "libc.h"
+#include "system.h"
+
+void bottler(int argc, char *argv[]);
+
+#endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/include/libc.h b/Userland/SampleCodeModule/include/libc.h
index f7999ba..82dc6de 100644
--- a/Userland/SampleCodeModule/include/libc.h
+++ b/Userland/SampleCodeModule/include/libc.h
@@ -26,5 +26,7 @@ char * reverse(char * buffer, int i, int j);
 int pow(int base, int exponent);
 char * strstrip(char * s, char c);
 void ftoa(double f, char * buf, int precision);
+char * strcat(char * dest, const char * src);
+int strcpy(char * strDest, const char * strSrc);
 
 #endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/include/system.h b/Userland/SampleCodeModule/include/system.h
index a80da92..2889aeb 100644
--- a/Userland/SampleCodeModule/include/system.h
+++ b/Userland/SampleCodeModule/include/system.h
@@ -1,8 +1,21 @@
 #ifndef SYSTEM_H
 #define SYSTEM_H
 
+typedef struct pid_t {
+    int pid;
+    struct pid_t * next;
+} pid_t;
+
+typedef struct sem_t {
+    unsigned int value;
+    // char name[MAX_NAME];
+    char * name;
+    pid_t * entering;
+    pid_t * last;
+} sem_t;
+
 // void sys_switchContext();
-void sys_loadProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd);
+int sys_loadProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd);
 int sys_time(char);
 void sys_exit();
 void sys_write(int, char *, int);
@@ -13,5 +26,16 @@ void * sys_malloc(int);
 void * sys_free(void *);
 void * sys_openPipe(int *, char *);
 char sys_nice(int, char);
+void sys_sleep(int);
+// void sys_semWait(void *);
+void sys_semWait(sem_t *);
+void sys_semPost(sem_t *);
+// void * sys_semOpen(char *, unsigned int);
+sem_t * sys_semOpen(char *, unsigned int);
+int sys_getPid();
+char sys_semClose(void *);
+void sys_kill(int pid);
+void sys_block(int pid);
+void sys_unblock(int pid);
 
 #endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/libc.c b/Userland/SampleCodeModule/libc.c
index 7aa82f9..a1f66bb 100644
--- a/Userland/SampleCodeModule/libc.c
+++ b/Userland/SampleCodeModule/libc.c
@@ -54,6 +54,14 @@ void winClear() {
     sys_write(1, "\e\f", 2);
 }
 
+int strcpy(char * strDest, const char * strSrc) {
+	int i = 0;
+    while (*strDest++ = *strSrc++) {
+		i++;
+	}
+    return i;
+}
+
 char* gtoa(int value, char* buffer, int base, int length) {
    if (base < 2 || base > 32) {
         return buffer;
diff --git a/Userland/SampleCodeModule/sampleCodeModule.c b/Userland/SampleCodeModule/sampleCodeModule.c
index d1b35a7..bcff4f5 100644
--- a/Userland/SampleCodeModule/sampleCodeModule.c
+++ b/Userland/SampleCodeModule/sampleCodeModule.c
@@ -1,16 +1,21 @@
 /* sampleCodeModule.c */
 #include "libc.h"
 #include "shell/include/shell.h"
+#include "bottler/include/bottler.h"
 #include <stddef.h>
 
-void sys_loadProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd);
+int sys_loadProcess(void (*fn) (int, char **), char foreground, int argc, char *argv[], int * fd);
 void sys_exit();
 // void sys_switchContext();
 
 int main(int argc, char *argv[]) {
     winClear();
 
-    char * argv2[] = {"BottlerSh"};
+    char * argv1[] = {"bottler"};
+    sys_loadProcess(bottler, 1, 1, argv1, NULL);
+    // sys_sleep(4);
+
+    char * argv2[] = {"shell"};
     sys_loadProcess(shell, 1, 1, argv2, NULL);
     // sys_loadProcess(shell);
 
diff --git a/Userland/SampleCodeModule/shell/commands/block.c b/Userland/SampleCodeModule/shell/commands/block.c
new file mode 100644
index 0000000..d989602
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/commands/block.c
@@ -0,0 +1,12 @@
+#include "block.h"
+
+void block(int argc, char ** argv) {
+    if (argc != 2) {
+        printStringLen("block receives a pid\n", 21);
+        sys_exit();
+    }
+    int pid = atoi(argv[1], MAX_LEN);
+
+    sys_block(pid);
+    sys_exit();
+}
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/commands/kill.c b/Userland/SampleCodeModule/shell/commands/kill.c
new file mode 100644
index 0000000..ddecaee
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/commands/kill.c
@@ -0,0 +1,12 @@
+#include "kill.h"
+
+void kill(int argc, char ** argv) {
+    if (argc != 2) {
+        printStringLen("kill receives a pid\n", 21);
+        sys_exit();
+    }
+    int pid = atoi(argv[1], MAX_LEN);
+
+    sys_kill(pid);
+    sys_exit();
+}
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/commands/loop.c b/Userland/SampleCodeModule/shell/commands/loop.c
new file mode 100644
index 0000000..5cd882c
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/commands/loop.c
@@ -0,0 +1,13 @@
+#include "loop.h"
+#define PUAN -1
+
+void loop(int argc, char *argv[]) {
+    int pid = sys_getPid(), secs = atoi(argv[1], PUAN);
+    char * str = "Hola, soy el proceso ";
+    char buffer[MAX_LEN];
+    str = strcat(str, itoa(pid, buffer, 10));
+    while (1) {
+        printString(str);
+        sys_sleep(secs);
+    }
+}
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/commands/nice.c b/Userland/SampleCodeModule/shell/commands/nice.c
index 2771f98..838aa6b 100644
--- a/Userland/SampleCodeModule/shell/commands/nice.c
+++ b/Userland/SampleCodeModule/shell/commands/nice.c
@@ -1,8 +1,10 @@
 #include "nice.h"
 
 void nice(int argc, char ** argv) {
-    if (argc != 3)
+    if (argc != 3) {
         printStringLen("nice receives a pid and an offset\n", 35);
+        sys_exit();
+    }
     int pid = atoi(argv[1], MAX_LEN);
     char offset = (char) atoi(argv[2], MAX_LEN);
 
diff --git a/Userland/SampleCodeModule/shell/commands/phylo.c b/Userland/SampleCodeModule/shell/commands/phylo.c
new file mode 100644
index 0000000..8900f80
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/commands/phylo.c
@@ -0,0 +1,240 @@
+#include "phylo.h"
+#include <stddef.h>
+#include <stdint.h>
+ 
+#define ARGV_SIZE 2
+#define BUFF_SIZE 20
+#define MAX_PHILO_SIZE 3
+#define MAX_NAME_SIZE 10
+#define STARTING 2
+
+// typedef uint64_t sem_t;
+// typedef struct pid_t {
+//     int pid;
+//     struct pid_t * next;
+// } pid_t;
+
+// typedef struct sem_t {
+//     unsigned int value;
+//     // char name[MAX_NAME];
+//     char * name;
+//     pid_t * entering;
+//     pid_t * last;
+// } sem_t;
+
+int * state;
+typedef enum states {EATING = 0, HUNGRY, THINKING} states;
+
+typedef struct philosopher_t {
+    int debug;
+    char ** argv;
+    char * buffer;
+    sem_t * sem;
+    int pid;
+    states state;
+
+    struct philosopher_t * left;
+    struct philosopher_t * right;
+} philosopher_t;
+
+philosopher_t * firstPhil;
+
+sem_t * mutex;
+
+int philoCount = STARTING;
+ 
+void printState() {
+    philosopher_t * phil = firstPhil;
+    do {
+        if (phil->state == EATING)
+            putChar('E');
+        else putChar('.');
+        phil = phil->right;
+    } while (phil != firstPhil);
+    putChar('\n');
+}
+
+void test(philosopher_t * phil)
+{
+    if (phil->state == HUNGRY && phil->left->state != EATING && phil->right->state != EATING) {
+        phil->state = EATING;
+ 
+        // sys_sleep(2);
+ 
+        sys_semPost(phil->sem);
+    }
+}
+
+void philosopher(int argc, char ** argv);
+
+void addPhilo() {
+    philoCount++;
+
+    philosopher_t * new = sys_malloc(sizeof(philosopher_t *));
+    new->argv = sys_malloc(sizeof(char *) * ARGV_SIZE);
+    new->buffer = sys_malloc(sizeof(char ) * BUFF_SIZE);
+    new->state = THINKING;
+    new->sem = sys_semOpen("filosofo", 0);
+
+    new->argv[0] = "filosofo";
+    new->argv[1] = itoa((uint64_t) new, new->argv[1], 10);
+
+    new->left = firstPhil->left;
+    new->right = firstPhil;
+
+    firstPhil->left->right = new;
+    firstPhil->left = new;
+
+    new->pid = sys_loadProcess(philosopher, 1, 2, new->argv, NULL);
+}
+
+void removePhilo() {
+    philoCount--;
+
+    philosopher_t * del = firstPhil->left;
+    del->left->right = del->right;
+    del->right->left = del->left;
+
+    sys_semClose(del->sem);
+    sys_free(del->buffer);
+    sys_free(del->argv);
+    sys_free(del);
+
+    sys_kill(del->pid);
+}
+
+void take_fork(philosopher_t * phil) {
+    sys_semWait(mutex);
+ 
+    phil->state = HUNGRY;
+    test(phil);
+ 
+    sys_semPost(mutex);
+ 
+    sys_semWait(phil->sem);
+ 
+    // sys_sleep(1);
+}
+ 
+void put_fork(philosopher_t * phil) {
+ 
+    sys_semWait(mutex);
+ 
+    phil->state = THINKING;
+ 
+    test(phil->left);
+    test(phil->right);
+ 
+    sys_semPost(mutex);
+}
+ 
+void philosopher(int argc, char ** argv)
+{
+    if (argc != 2) {
+        sys_exit();
+    }
+    
+    philosopher_t * i = (philosopher_t *) ((uint64_t) atoi(argv[1], -1));
+
+    while (1) {
+        // sys_sleep(1);
+ 
+        take_fork(i);
+        // printState();
+ 
+        // sys_sleep(1);
+ 
+        put_fork(i);
+        // printState();
+    }
+    sys_exit();
+}
+
+void phylo(int argc, char ** argv) {
+    if (argc == 1)
+        philoCount = STARTING;
+    else if (argc == 2) {
+        philoCount = atoi(argv[1], -1);
+        if (philoCount < 1 || philoCount > MAX_PHILO_SIZE) {
+            printStringLen("amount of philosofers must be between 1 and 10\n", 48);
+            sys_exit();
+        }
+    }
+    else sys_exit();
+
+    mutex = sys_semOpen("Mutex", 1);
+
+    philosopher_t * left = NULL;
+    for (int i = 0; i < philoCount; i++) {
+        philosopher_t * phil = sys_malloc(sizeof(philosopher_t));
+        phil->debug = i;
+        phil->argv = sys_malloc(sizeof(char *) * 2);
+        phil->buffer = sys_malloc(20);
+        phil->state = THINKING;
+        phil->sem = sys_semOpen("filosofo", 0);
+
+        phil->argv[0] = "filosofo";
+        // phil->argv[1] = itoa((uint64_t) phil, phil->argv[1], 10);
+        strcpy(phil->buffer, itoa((uint64_t) phil, phil->buffer, 10));
+        phil->argv[1] = phil->buffer;
+
+        if (left != NULL) {
+            phil->left = left;
+            phil->left->right = phil;
+        }
+
+        if (firstPhil == NULL) {
+            firstPhil = phil;
+        }
+
+        left = phil;
+    }
+
+    firstPhil->left = left;
+    firstPhil->left->right = firstPhil;
+
+
+    philosopher_t * phil = firstPhil;
+
+    do {
+        phil->pid = sys_loadProcess(philosopher, 1, 2, phil->argv, NULL);
+        phil = phil->right;
+    } while (phil != firstPhil);
+    
+    // char c;
+    // while (1)  {
+    //     while ((c = getChar()) != 0 && c != -1) {
+    //         if (c == 'a') {
+    //             addPhilo();
+    //         }
+    //         else if (c == 'r') {
+    //             removePhilo();
+    //         }
+    //         else if (c == 'q') {
+    //             break;
+    //         }
+    //     }
+    // }
+
+    // phil = firstPhil;
+    // do {
+    //     sys_semClose(phil);
+    //     sys_free(phil);
+    //     sys_free(phil);
+    //     sys_free(phil);
+
+    //     sys_kill(phil->pid);
+    //     phil = phil->right;
+    // } while (phil != firstPhil); // PROBLEMA
+
+    sys_exit();
+}
+
+
+// La primera es muy similar a:
+
+/*
+ * Taken from "Operating Systems - Design and Implementation" by Tanenbaum
+ * Section 2.3, page 91, Figure 2-10
+ * https://gist.github.com/codelance/4186161
+*/
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/commands/printmem.c b/Userland/SampleCodeModule/shell/commands/printmem.c
index 3f91936..565afab 100644
--- a/Userland/SampleCodeModule/shell/commands/printmem.c
+++ b/Userland/SampleCodeModule/shell/commands/printmem.c
@@ -17,7 +17,7 @@ void getMem(int * buffer, int initialAddress) {
 void printmem(int argc, char *argv[]) {
 	if (argc != 2) {
 		printStringLen("printmem receives a memory position\n", 37);
-		return;
+		sys_exit();
 	}
 
 	int buffer[8];
diff --git a/Userland/SampleCodeModule/shell/commands/quadratic.c b/Userland/SampleCodeModule/shell/commands/quadratic.c
index f646fb0..af0fb69 100644
--- a/Userland/SampleCodeModule/shell/commands/quadratic.c
+++ b/Userland/SampleCodeModule/shell/commands/quadratic.c
@@ -6,20 +6,20 @@
 void quadratic(int argc, char *argv[]) {
     if (argc != 4) {
         printStringLen("quadratic receives 3 doubles\n", 30);
-        return;
+        sys_exit();
     }
     
     double sol1, sol2, a = atof(argv[1]), b = atof(argv[2]), c = atof(argv[3]);
     if (a == 0) {
         printStringLen("First argument cannot be 0\n", 28);
-        return;
+        sys_exit();
     }
 
     int cond = quadSolver(a, b, c, &sol1, &sol2);
 
 	if (cond == 0) {
 		printStringLen("Not real!\n", 11);
-        return;
+        sys_exit();
     }
 	
 	char buffer[30] = {0};
diff --git a/Userland/SampleCodeModule/shell/commands/unblock.c b/Userland/SampleCodeModule/shell/commands/unblock.c
new file mode 100644
index 0000000..8fd5753
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/commands/unblock.c
@@ -0,0 +1,12 @@
+#include "unblock.h"
+
+void unblock(int argc, char ** argv) {
+    if (argc != 2) {
+        printStringLen("unblock receives a pid\n", 21);
+        sys_exit();
+    }
+    int pid = atoi(argv[1], MAX_LEN);
+
+    sys_unblock(pid);
+    sys_exit();
+}
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/include/block.h b/Userland/SampleCodeModule/shell/include/block.h
new file mode 100644
index 0000000..c135504
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/include/block.h
@@ -0,0 +1,11 @@
+#ifndef BLOCK_LIB
+#define BLOCK_LIB
+
+#include "libc.h"
+#include "system.h"
+
+#define MAX_LEN 10
+
+void block(int argc, char *argv[]);
+
+#endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/include/kill.h b/Userland/SampleCodeModule/shell/include/kill.h
new file mode 100644
index 0000000..2d98363
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/include/kill.h
@@ -0,0 +1,11 @@
+#ifndef KILL_LIB
+#define KILL_LIB
+
+#include "libc.h"
+#include "system.h"
+
+#define MAX_LEN 10
+
+void kill(int argc, char *argv[]);
+
+#endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/include/loop.h b/Userland/SampleCodeModule/shell/include/loop.h
new file mode 100644
index 0000000..11252eb
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/include/loop.h
@@ -0,0 +1,11 @@
+#ifndef LOOP_LIB
+#define LOOP_LIB
+
+#include "libc.h"
+#include "system.h"
+
+#define MAX_LEN 100
+
+void loop(int argc, char *argv[]);
+
+#endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/include/phylo.h b/Userland/SampleCodeModule/shell/include/phylo.h
new file mode 100644
index 0000000..cb3d3a2
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/include/phylo.h
@@ -0,0 +1,9 @@
+#ifndef PHYLO_LIB
+#define PHYLO_LIB
+
+#include "libc.h"
+#include "system.h"
+
+void phylo(int argc, char *argv[]);
+
+#endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/include/unblock.h b/Userland/SampleCodeModule/shell/include/unblock.h
new file mode 100644
index 0000000..31c526a
--- /dev/null
+++ b/Userland/SampleCodeModule/shell/include/unblock.h
@@ -0,0 +1,11 @@
+#ifndef UNBLOCK_LIB
+#define UNBLOCK_LIB
+
+#include "libc.h"
+#include "system.h"
+
+#define MAX_LEN 10
+
+void unblock(int argc, char *argv[]);
+
+#endif
\ No newline at end of file
diff --git a/Userland/SampleCodeModule/shell/shell.c b/Userland/SampleCodeModule/shell/shell.c
index 1710464..102161a 100644
--- a/Userland/SampleCodeModule/shell/shell.c
+++ b/Userland/SampleCodeModule/shell/shell.c
@@ -16,6 +16,10 @@
 #include "semCom.h"
 #include "stddef.h"
 #include "nice.h"
+#include "phylo.h"
+#include "kill.h"
+#include "block.h"
+#include "unblock.h"
 #define EXIT_FAILURE 1
 #define EXIT_SUCCESS 0
 
@@ -31,11 +35,12 @@ typedef struct cmd_t {
     char isBuiltIn;
 } cmd_t;
 
-const int len = 15;
 cmd_t commands[] = {
     { "help", help, 1 },
     { "cat", cat, 0 },
     { "time", time, 1 },
+    { "block", block, 0 },
+    { "unblock", unblock, 0 },
     { "inforeg", inforeg, 1 },
     { "excdiv", excdiv, 1 },
     { "excop", excop, 1 },
@@ -44,10 +49,13 @@ cmd_t commands[] = {
     { "cpufeatures", cpufeatures, 1 },
     { "nice", nice, 0 },
     { "ps", ps, 1 },
+    { "kill", kill, 1 },
     { "sem", sem, 1 },
     { "quadratic", quadratic, 0 },
     { "printmem", printmem, 0 },
+    { "phylo", phylo, 0 },
     { "wc", wc, 0 },
+    { NULL, NULL, 0}
 };
 
 int scanfNoPrint(char * buffer) {
@@ -119,7 +127,7 @@ void processInput(char * input) {
         for (int i = 0; i < end; i++)
             argv0[i] = tokens[i];
     }
-    for (int i = 0; i < len; i++) {
+    for (int i = 0; commands[i].name != NULL; i++) {
         if (!strcmp(tokens[0], commands[i].name)) {
             comm_flag0 = 1;
             comm0 = i;
@@ -127,7 +135,7 @@ void processInput(char * input) {
         }
     }
     if (comm_flag0 && pipe != -1) {
-        for (int i = 0; i < len; i++) {
+        for (int i = 0; commands[i].name != NULL; i++) {
             if (!strcmp(tokens[pipe + 1], commands[i].name)) {
                 comm_flag1 = 1;
                 comm1 = i;