int main( int argc , char ** argv )
{
int scr_sem,holdp3_sem; /* sid of screen semaphore */
int id1, id2, id3; /* ID of child process */
holdp3_sem = Open_Semaphore ("holdp3_sem", 0);
scr_sem = Open_Semaphore ( "screen" , 1 ) ;
P ( scr_sem ) ;
Print ("Semtest1 begins\n");
V ( scr_sem ) ;
id3 = Spawn_Program ( "/c/sem-p3.exe", "/c/sem-p3.exe", 0 ) ;
P ( scr_sem ) ;
Print ("p3 created\n");
V ( scr_sem ) ;
id1 = Spawn_Program ( "/c/sem-p1.exe", "/c/sem-p2.exe", 0 ) ;
id2 = Spawn_Program ( "/c/sem-p2.exe", "/c/sem-p1.exe", 0 ) ;
Wait(id1);
Wait(id2);
Wait(id3);
Close_Semaphore(scr_sem);
Close_Semaphore(holdp3_sem);
return 0;
}
int main(int argc , char ** argv)
{
int i,j ; /* loop index */
int scr_sem; /* id of screen semaphore */
int time; /* current and start time */
int ping,pong; /* id of semaphores to sync processes b & c */
time = Get_Time_Of_Day();
scr_sem = Open_Semaphore ("screen" , 1) ; /* register for screen use */
ping = Open_Semaphore ("ping" , 1) ;
pong = Open_Semaphore ("pong" , 0) ;
for (i=0; i < 5; i++) {
P(pong);
P (scr_sem);
Print ("Ping\n");
V(scr_sem);
for (j=0; j < 35; j++);
V(ping);
}
time = Get_Time_Of_Day() - time;
P (scr_sem) ;
Print ("Process Ping is done at time: %d\n", time) ;
V(scr_sem);
Close_Semaphore(pong);
Close_Semaphore(ping);
Close_Semaphore(scr_sem);
return (0);
}
int main(int argc, char** argv)
{
int scr_sem,holdp3_sem;
scr_sem = Open_Semaphore ( "screen" , 1 ) ; /* register for screen use */
holdp3_sem = Open_Semaphore ("holdp3_sem", 0);
P(holdp3_sem);
P ( scr_sem ) ;
Print("p3 executed\n");
V( scr_sem );
V(holdp3_sem);
Close_Semaphore(scr_sem);
Close_Semaphore(holdp3_sem);
return 0;
}
int main( int argc , char ** argv )
{
int holdsched3_sem;
holdsched3_sem = Open_Semaphore("holdsched3_sem",0);
P(holdsched3_sem);
Print("3");
V(holdsched3_sem);
Close_Semaphore(holdsched3_sem);
return 0;
}
int main( int argc , char ** argv )
{
int i ; /* loop index */
int scr_sem; /* id of screen semaphore */
int prod_sem,cons_sem;
scr_sem = Open_Semaphore ( "screen" , 1 ) ; /* register for screen use */
prod_sem = Open_Semaphore ( "prod_sem" , 0 ) ;
cons_sem = Open_Semaphore ( "cons_sem" , 1 ) ;
for (i=0; i < 5; i++) {
P(cons_sem);
Print ("Produced %d\n",i) ;
V(prod_sem);
}
Close_Semaphore(scr_sem);
Close_Semaphore(prod_sem);
Close_Semaphore(cons_sem);
return 0;
}
int main(int argc, char **argv) {
int policy = -1;
int start;
int elapsed;
int scr_sem; /* sid of screen semaphore */
int id1, id2, id3; /* ID of child process */
if(argc == 2) {
if(!strcmp(argv[1], "rr")) {
policy = 0;
} else if(!strcmp(argv[1], "mys")) {
policy = 1;
} else {
Print("usage: %s [rr|mys]\n", argv[0]);
Exit(1);
}
Set_Scheduling_Policy(policy, 20);
} else {
Print("usage: %s [rr|mys]\n", argv[0]);
Exit(1);
}
start = Get_Time_Of_Day();
scr_sem = Open_Semaphore("screen", 1);
P(scr_sem);
Print("************* Start Workload Generator *********\n");
V(scr_sem);
id1 = Spawn_Program("/c/long.exe", "/c/long.exe", 0);
P(scr_sem);
Print("Process Long has been created with ID = %d\n", id1);
V(scr_sem);
id2 = Spawn_Program("/c/long.exe", "/c/long.exe", 0);
P(scr_sem);
Print("Process Long #1 has been created with ID = %d\n", id2);
V(scr_sem);
#ifdef notdef
id2 = Spawn_Program("/c/ping.exe", "/c/ping.exe", 0);
P(scr_sem);
Print("Process Ping has been created with ID = %d\n", id2);
V(scr_sem);
id3 = Spawn_Program("/c/pong.exe", "/c/pong.exe", 0);
P(scr_sem);
Print("Process Pong has been created with ID = %d\n", id3);
V(scr_sem);
#endif
Wait(id1);
Wait(id2);
// Wait(id3);
elapsed = Get_Time_Of_Day() - start;
Print("\nTests Completed at %d\n", elapsed);
return 0;
}
*/
#include <conio.h>
#include <process.h>
#include <sched.h>
#include <sema.h>
#include <string.h>
int main(int argc __attribute__ ((unused)), char **argv
__attribute__ ((unused))) {
int i, j; /* loop index */
int scr_sem; /* id of screen semaphore */
int time; /* current and start time */
int ping, pong; /* id of semaphores to sync processes b & c */
time = Get_Time_Of_Day();
scr_sem = Open_Semaphore("screen", 1); /* register for screen use */
ping = Open_Semaphore("ping", 1);
pong = Open_Semaphore("pong", 0);
for (i = 0; i < 5; i++) {
P(ping);
P(scr_sem);
Print("Pong\n");
V(scr_sem);
for (j = 0; j < 35; j++);
V(pong);
}
time = Get_Time_Of_Day() - time;
* Copyright (c) 2003,2013,2014 Jeffrey K. Hollingsworth <*****@*****.**>
*
* All rights reserved.
*
* This code may not be resdistributed without the permission of the copyright holders.
* Any student solutions using any of this code base constitute derviced work and may
* not be redistributed in any form. This includes (but is not limited to) posting on
* public forums or web sites, providing copies to (past, present, or future) students
* enrolled in similar operating systems courses the University of Maryland's CMSC412 course.
*/
#include <conio.h>
#include <process.h>
#include <sched.h>
#include <sema.h>
#include <string.h>
int main(int argc __attribute__ ((unused)), char **argv
__attribute__ ((unused))) {
int holdsched3_sem;
holdsched3_sem = Open_Semaphore("holdsched3_sem", 0);
P(holdsched3_sem);
Print("3");
V(holdsched3_sem);
Close_Semaphore(holdsched3_sem);
return 0;
}
