CS3871/assignments/sync: Initial Commit

1 files changed, 51 insertions, 0 deletions

diff --git a/sync/writer.c b/sync/writer.c
new file mode 100644
index 0000000..0a7a1fe
--- /dev/null
+++ b/sync/writer.c
@@ -0,0 +1,51 @@
+
+#include <sys/types.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <types.h>
+
+
+int main(argc, argv)
+int argc;
+char **argv;
+{
+	int shmid, i, pid, id;
+	char *mem;
+	timeval *s;
+
+	if (argc != 1) {
+		printf("usage: reader [id]\n");
+		exit(1);
+	}
+
+	id = atoi(argv[1]);
+
+	if (argc < 2) {
+		printf("usage: sync [number readers] [number writers]\n");
+		exit(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);
+	}
+	
+	srand(time(NULL));
+
+
+	while (1) {
+		s->tv_sec = rand() % (id * 2;
+		for (i = 0; i < 1<<14; i++) {
+			mem[i]= 0x30 + id;
+			select(0, NULL, NULL, NULL, s);
+		}
+	}
+}