Moves assignments to given course folder.

5 files changed, 0 insertions, 326 deletions

diff --git a/sync/assign.rst b/sync/assign.rst
deleted file mode 100644
index ea4a566..0000000
--- a/sync/assign.rst
+++ /dev/null
@@ -1,41 +0,0 @@
-================
-Syncronization 1
-================
-
-Write a program that uses semaphores to implement a readers/writers solution. Your program should:
-
-    - be written in C and use the standard kernel IPC mechanisms (semget,semop,shmget etc)
-    - be written as a single top level source file compiled as:  gcc –o myprog  myprog.c
-    - take two arguments on the command line:   myprog NR NW  where NR,NW are each integers specifying the number of reader/writer processes respectively
-    - use fork/exec to create the readers/writers
-
-The shared memory segment should be 16k bytes in size, with all bytes initialized to 0x30
-
-Reader:
-
-.. code ::
-
-  open a file (for append) named reader.N, where N is the reader number
-  while (1) {
-        for (i=0; i<16k; i++) {
-                  read the next byte of the shared memory segment
-                  write that byte to the file
-                  flush the file
-        }
-        sleep a random number of seconds, between 0 and N inclusive
-  }
-
-Writer:
-
-.. code ::
-
-        while (1) {
-	        for (i=0; i<16k; i++)
-	        	shared memory segment[i] = N + 0x30;
-        	sleep a random number of seconds between 0 and 2*N inclusive
-        }
-
-readers and writers should be mutually exclusive
-multiple concurrent readers are allowed
-writers have priority over readers
-writers are mutually exclusive relative to each other
diff --git a/sync/makefile b/sync/makefile
deleted file mode 100644
index dd9c463..0000000
--- a/sync/makefile
+++ /dev/null
@@ -1,5 +0,0 @@
-sync: sync.c reader.c writer.c
-	cc -o sync sync.c
-	cc -o reader reader.c
-	cc -o writer writer.c
-
diff --git a/sync/reader.c b/sync/reader.c
deleted file mode 100644
index 929eba1..0000000
--- a/sync/reader.c
+++ /dev/null
@@ -1,86 +0,0 @@
-#include <errno.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/ipc.h>
-#include <sys/select.h>
-#include <sys/sem.h>
-#include <sys/shm.h>
-#include <sys/types.h>
-#include <time.h>
-#include <unistd.h>
-
-#define NSEM 3
-#define KEY 52
-
-char *mem;
-
-void quit(signum)
-int signum;
-{
-	shmdt(mem);
-	exit(1);
-}
-
-int main(argc, argv)
-int argc;
-char **argv;
-{
-	int shmid, semid, i, pid, id;
-	char filename[50];
-	FILE *fd;
-	struct sembuf sb;
-
-	if (argc < 2) {
-		printf("usage: reader [id]\n");
-		exit(1);
-	}
-
-	id = atoi(argv[1]);
-
-
-	if ((shmid = shmget(52, 1<<14, IPC_CREAT | 0666)) == -1){
-		perror("shmget: shmget failed");
-		exit(1);
-	}
-
-	if ((mem = shmat(shmid, NULL, 0)) == (char *) -1) {
-		perror("shmat");
-		exit(1);
-	}
-
-	if ((semid = semget(shmid, NSEM, 0)) == -1) {
-		perror("Rsemget: ");
-		exit(1);
-	}
-
-	signal(SIGQUIT, quit);
-
-	sprintf(filename, "reader.%d", id);
-	
-	fd = fopen(filename, "a");
-
-	if (!fd) {
-		perror("fopen: ");
-		exit(1);
-	}
-	srand(time(NULL));
-
-	while (1) {
-		sb.sem_num = 0; sb.sem_op = -1; sb.sem_flg = 0;
-		semop(semid, &sb, 1);
-
-		for (i = 0; i < 1<<14; i++) {
-			fprintf(fd, "%c", *(mem + i));
-			fflush(fd);
-		}
-		fprintf(fd, "\n");
-		fflush(fd);
-
-		sb.sem_op = 1;
-		semop(semid, &sb, 1);
-
-
-		sleep(rand() % (id + 1));
-	}
-}
diff --git a/sync/sync.c b/sync/sync.c
deleted file mode 100644
index 23d6ba1..0000000
--- a/sync/sync.c
+++ /dev/null
@@ -1,118 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <sys/shm.h>
-#include <sys/types.h>
-#include <sys/wait.h>
-#include <unistd.h>
-
-#define NSEM 3
-
-union semun {
-	int val;
-	struct semid_ds *buf;
-	ushort *array;
-};
-
-
-int shmid, semid;
-
-void quit(signum)
-int signum;
-{
-	shmctl(shmid, IPC_RMID, NULL);
-	semctl(semid, IPC_RMID, 0);
-}
-
-
-int main(argc, argv)
-int argc;
-char **argv;
-{
-	int i, pid, n_read, n_write, w;
-	char *mem, **arg_r, **arg_w;
-	union semun semarg;
-
-	if (argc < 2) {
-		printf("usage: sync [number readers] [number writers]\n");
-		exit(1);
-	}
-	n_read = atoi(argv[1]);
-	n_write = atoi(argv[2]);
-
-	if ((shmid = shmget(52, 1<<14, IPC_CREAT | 0666)) == -1){
-		perror("shmget: shmget failed");
-		exit(1);
-	}
-
-	if ((mem = shmat(shmid, NULL, 0)) == (char *) -1) {
-		perror("shmat");
-		exit(1);
-	}
-printf("Sshmid: %x\n", shmid);
-	signal(SIGQUIT, quit);
-
-	for (i = 0; i < 1<<14; i++) {
-		*(mem + i) = 0x30;
-	}
-
-	if ((semid = semget(shmid, NSEM, 0666 | IPC_CREAT)) == -1) {
-		perror("Ssemget: ");
-		exit(1);
-	}
-
-	semarg.val = 1;
-	for (i = 0; i < NSEM; i++) {
-		if ((semctl(semid, i, SETVAL, semarg)) == -1) {
-			perror("semctl: ");
-			exit(1);
-		}
-	}
-
-
-	arg_r = malloc(sizeof(char*) * 3);
-	arg_w = malloc(sizeof(char*) * 3);
-	*arg_r = malloc(sizeof(char) * 10);
-	*arg_w = malloc(sizeof(char) * 10);
-
-	*(arg_r + 1) = malloc(sizeof(char) * 50);
-	*(arg_w + 1) = malloc(sizeof(char) * 50);
-
-	*arg_r = "reader";
-	*arg_w = "writer";
-
-	*(arg_r + 2) = NULL;
-	*(arg_w + 2) = NULL;
-
-	for (i = 0; i < n_read; i++){
-		sprintf(*(arg_r + 1), "%d", i);
-		if (pid = fork()) {
-			/* printf("starting reader %d...\n", i); */
-		} else {
-			int ret = execv("./reader", arg_r);
-			printf("exec retern %d", ret);
-		}
-	}
-
-	for (i = 0; i < n_write; i++) {
-		sprintf(*(arg_w + 1), "%d", i);
-		if (pid = fork()) {
-			/* printf("starting writer %d...\n", i); */
-		} else {
-			execvp("./writer", arg_w);
-		}
-		
-	}
-
-	shmdt(mem);
-printf("sync done...\n");
-/* TODO
- * why is this returning 8
- */
-	for (i = 0; i < (n_write + n_read); i++) {
-		wait(&w);
-		printf("\nReturned with code:%d\n", WEXITSTATUS(w));
-	}
-	quit();
-}
diff --git a/sync/writer.c b/sync/writer.c
deleted file mode 100644
index d38dd70..0000000
--- a/sync/writer.c
+++ /dev/null
@@ -1,76 +0,0 @@
-#include <errno.h>
-#include <signal.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <sys/ipc.h>
-#include <sys/select.h>
-#include <sys/sem.h>
-#include <sys/shm.h>
-#include <sys/types.h>
-#include <sys/types.h>
-#include <time.h>
-#include <unistd.h>
-
-#define NSEM 3
-
-char *mem;
-
-void quit(signum)
-int signum;
-{
-	shmdt(mem);
-	exit(1);
-}
-
-int main(argc, argv)
-int argc;
-char **argv;
-{
-	int shmid, semid, i, pid, id;
-	char *mem;
-	struct sembuf sb;
-
-	if (argc < 2) {
-		printf("usage: writer [id]\n");
-		exit(1);
-	}
-
-	id = atoi(argv[1]);
-
-
-	if ((shmid = shmget(52, 1<<14, IPC_CREAT | 0666)) == -1){
-		perror("shmget: shmget failed");
-		exit(1);
-	}
-
-	if ((mem = shmat(shmid, NULL, 0)) == (char *) -1) {
-		perror("shmat");
-		exit(1);
-	}
-printf("Wshmid: %x\n", shmid);
-
-	if ((semid = semget(shmid, NSEM, 0)) == -1) {
-		perror("Wsemget: ");
-		exit(1);
-	}
-
-	signal(SIGQUIT, quit);
-	
-	srand(time(NULL));
-
-	while (1) {
-		rand() % id;
-		
-		sb.sem_num = 0; sb.sem_op = -1; sb.sem_flg = 0;
-		semop(semid, &sb, 1);
-
-		for (i = 0; i < 1<<14; i++) {
-			mem[i]= 0x30 + id;
-		}
-		
-		sb.sem_op = 1;
-		semop(semid, &sb, 1);
-
-		sleep(rand() % ((id * 2) + 1));
-	}
-}