diff --git a/xv6-public/Makefile b/xv6-public/Makefile
old mode 100755
new mode 100644
index b4fd9a2..af4e706
--- a/xv6-public/Makefile
+++ b/xv6-public/Makefile
@@ -172,6 +172,7 @@ UPROGS=\
 	_usertests\
 	_wc\
 	_zombie\
+	_getpcount\
 
 fs.img: mkfs README $(UPROGS)
 	./mkfs fs.img README $(UPROGS)
diff --git a/xv6-public/getpcount.c b/xv6-public/getpcount.c
new file mode 100644
index 0000000..e5e54b1
--- /dev/null
+++ b/xv6-public/getpcount.c
@@ -0,0 +1,11 @@
+#include "types.h"
+#include "stat.h"
+#include "user.h"
+
+int
+main(void){
+        int running_count;
+        running_count = getpcount();
+        printf(1, "Processes currently running: %d\n", running_count);
+        exit();
+}
diff --git a/xv6-public/syscall.c b/xv6-public/syscall.c
old mode 100755
new mode 100644
index 799ebc2..35e7c3a
--- a/xv6-public/syscall.c
+++ b/xv6-public/syscall.c
@@ -98,6 +98,7 @@ extern int sys_unlink(void);
 extern int sys_wait(void);
 extern int sys_write(void);
 extern int sys_uptime(void);
+extern int sys_getpcount(void);
 
 static int (*syscalls[])(void) = {
 [SYS_fork]    sys_fork,
@@ -121,6 +122,7 @@ static int (*syscalls[])(void) = {
 [SYS_link]    sys_link,
 [SYS_mkdir]   sys_mkdir,
 [SYS_close]   sys_close,
+[SYS_getpcount]   sys_getpcount,
 };
 
 void
diff --git a/xv6-public/syscall.h b/xv6-public/syscall.h
old mode 100755
new mode 100644
index bc5f356..694e78c
--- a/xv6-public/syscall.h
+++ b/xv6-public/syscall.h
@@ -20,3 +20,4 @@
 #define SYS_link   19
 #define SYS_mkdir  20
 #define SYS_close  21
+#define SYS_getpcount  22
diff --git a/xv6-public/sysproc.c b/xv6-public/sysproc.c
old mode 100755
new mode 100644
index 027a5e5..d712cd3
--- a/xv6-public/sysproc.c
+++ b/xv6-public/sysproc.c
@@ -6,6 +6,28 @@
 #include "memlayout.h"
 #include "mmu.h"
 #include "proc.h"
+#include "spinlock.h"
+
+struct {
+  struct spinlock lock;
+  struct proc proc[NPROC];
+} ptable;
+		
+int
+sys_getpcount(void)
+{
+  struct proc *p;
+  acquire(&ptable.lock);
+  int count = 0;
+  for(p = ptable.proc; p < &ptable.proc[NPROC]; p++){
+    // Process states: UNUSED, EMBRYO, SLEEPING, RUNNABLE, RUNNING, ZOMBIE
+    if(p->state == SLEEPING){count++;}
+    else if(p->state == RUNNABLE){count++;}
+    else if(p->state == RUNNING){count++;}
+  }
+  release(&ptable.lock);
+  return count;
+}
 
 int
 sys_fork(void)
diff --git a/xv6-public/user.h b/xv6-public/user.h
old mode 100755
new mode 100644
index f45b8d5..dd28e61
--- a/xv6-public/user.h
+++ b/xv6-public/user.h
@@ -23,6 +23,7 @@ int getpid(void);
 char* sbrk(int);
 int sleep(int);
 int uptime(void);
+int getpcount(void);
 
 // ulib.c
 int stat(char*, struct stat*);
diff --git a/xv6-public/usys.S b/xv6-public/usys.S
old mode 100755
new mode 100644
index 8bfd8a1..2175e63
--- a/xv6-public/usys.S
+++ b/xv6-public/usys.S
@@ -29,3 +29,4 @@ SYSCALL(getpid)
 SYSCALL(sbrk)
 SYSCALL(sleep)
 SYSCALL(uptime)
+SYSCALL(getpcount)