uni

commit f598344ca4bda3170af95e5d88f3d7381d1c2227
parent cce0228b4f5561ae11b06e8abc1bd530cf23ac2a
Author: Christos Margiolis <christos@margiolis.net>
Date:   Tue, 20 Apr 2021 00:03:36 +0300

foobar

Diffstat:
A
c-os2/ex2/ex1_1.c
 | 
102
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
D
c-os2/lab3.c
 | 
14
--------------
M
octave-signals-systems/ex2/doc.pdf
 | 
0

M
sql-databases/ex1/new_personnel.sql
 | 
3
++-
D
vhdl-digital-design/ex2/latch_tb
 | 
0

5 files changed, 104 insertions(+), 15 deletions(-)
diff --git a/c-os2/ex2/ex1_1.c b/c-os2/ex2/ex1_1.c
@@ -0,0 +1,102 @@
+#include <pthread.h>
+#include <semaphore.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define LEN(x) (sizeof(x) / sizeof(x[0]))
+
+/*
+ * Εργαστήριο ΛΣ2 (Δ6) / Εργασία 2: Άσκηση 1.1 / 2020-2021
+ * Ονοματεπώνυμο: Χρήστος Μαργιώλης
+ * ΑΜ: 19390133
+ * Τρόπος μεταγλώττισης: `cc ex1_1.c -lpthread -lrt -o ex1_1`
+ */
+
+struct foo {
+	sem_t mutex;
+	char *str;
+};
+
+/* Function declarations */
+static void *tdprint(void *);
+static void *emalloc(size_t);
+static void die(const char *);
+
+/* Global variables */
+static char *argv0; 		/* Program name */
+static const char *nums[] = {	/* Each thread will print one of these */
+	"<one>",
+	"<two>",
+	"<three>",
+};
+
+static void *
+tdprint(void *foo)
+{
+	struct foo *f;
+	
+	f = (struct foo *)foo;
+	sem_wait(&f->mutex);
+	printf("%s", f->str);
+	/* Prevent memory leak from strdup(2). */
+	free(f->str);
+	sem_post(&f->mutex);
+
+	return NULL;
+}
+
+/* Error checking malloc(2) */
+static void *
+emalloc(size_t nb)
+{
+	void *p;
+
+	if ((p = malloc(nb)) == NULL)
+		die("malloc");
+	return p;
+}
+
+/* Die. */
+static void
+die(const char *str)
+{
+	fprintf(stderr, "%s: ", argv0);
+	perror(str);
+	exit(EXIT_FAILURE);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct foo *f;
+	pthread_t *tds;
+	int len;
+	int n = 5;
+	int i;
+
+	argv0 = *argv;
+	len = LEN(nums);
+	f = emalloc(sizeof(struct foo));
+	tds = emalloc(len * sizeof(pthread_t));
+
+	sem_init(&f->mutex, 0, 1);
+	while (n--) {
+		for (i = 0; i < len; i++) {
+			/* Get appropriate string. */
+			f->str = strdup(nums[i % len]);
+			if (pthread_create(&tds[i], NULL, tdprint, (void *)f) != 0)
+				die("pthread_create");
+			if (pthread_join(tds[i], NULL) != 0)
+				die("pthread_join");
+		}
+	}
+	printf("\n");
+
+	sem_destroy(&f->mutex);
+	pthread_exit(NULL);
+	free(tds);
+	free(f);
+
+	return 0;
+}
diff --git a/c-os2/lab3.c b/c-os2/lab3.c
@@ -1,14 +0,0 @@
-#include <sys/ipc.h>
-#include <sys/shm.h>
-#include <sys/types.h>
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-
-int
-main(int argc, char *argv[])
-{
-
-	return 0;
-}
diff --git a/octave-signals-systems/ex2/doc.pdf b/octave-signals-systems/ex2/doc.pdf
Binary files differ.
diff --git a/sql-databases/ex1/new_personnel.sql b/sql-databases/ex1/new_personnel.sql
@@ -61,16 +61,17 @@ INSERT INTO ASSIGN VALUES
 
 /* .schema -> DESCRIBE */
 .schema
+
 /* Make output pretty */
 .header on
 .mode column
+
 /* Show contents of every table */
 SELECT * FROM DEPT;
 SELECT * FROM EMP;
 SELECT * FROM PROJ;
 SELECT * FROM ASSIGN;
 
-
 /*
  * Output after execution (`sqlite3 -init new_personnel.sql`):
  *
diff --git a/vhdl-digital-design/ex2/latch_tb b/vhdl-digital-design/ex2/latch_tb
Binary files differ.