Turn On/Off pids on notifying other processes.

[wsti_so.git] / src / process1.c

diff --git a/src/process1.c b/src/process1.c
index 2492ebecfe874f5ed4b4bae357b8e05aa56122f0..69e6bda8ab4d0189e491aeb87b817769e83ce72c 100644 (file)
--- a/src/process1.c
+++ b/src/process1.c
@@ -48,14 +48,24 @@ struct message {
 struct message * processes = NULL;
 
 /**
- * Message queue variables
+ * Message Queue variables
  */
-key_t qkey;
-int qid_input;
 
-int qid_output1;
-int qid_output2;
+/**
+ * Unique key of message queue.
+ */
+key_t qkey = 12356;
+
+/**
+ * Queue descriptor.
+ */
+int qid;
 
+/**
+ * Structure holding queue message data.
+ * Parameter mtype describes process to whom message is sent.
+ * Parameter signo is a signal to raise after getting message.
+ */
 struct queue_message {
        long mtype;
        int signo[1];
@@ -72,7 +82,7 @@ void notify_other_processes(int signo) {
                if (i != 0 && pid != 0) {
                        msg.mtype = i+1;
                        fprintf(stderr, "[%s] Sending message of type (%d) with value %d\n", "process1", msg.mtype, msg.signo[0]);
-                       msgsnd(pid, &msg, sizeof(int), 0);
+                       msgsnd(qid, &msg, sizeof(int), 0);
                        fprintf(stderr, "[%s] Sending signal %s (%d) to PID: %d\n", "process1", strsignal(SIGUSR1), SIGUSR1, pid);
                        kill(pid, SIGUSR1);
                }
@@ -85,25 +95,18 @@ void notify_other_processes(int signo) {
 void sig_handler(int signo)
 {
        fprintf(stderr, "[%s] Received %s!\n", "process1", strsignal(signo));
-
        if (signo == SIGUSR1) {
                fprintf(stderr, "[%s] > Notified!\n", "process1");
                struct queue_message msg;
                /* Check queues from both other processes */
-               if (msgrcv(processes->pids[1], &msg, sizeof(int), 1, 0) > 0) {
+               if (msgrcv(qid, &msg, sizeof(int), 1, 0) > 0) {
                        fprintf(stderr, "[%s] > Notified with value: %s!\n", "process1", strsignal(msg.signo[0]));
                        raise(msg.signo[0]);
-                       break;
-               }
-               else if (msgrcv(processes->pids[2], &msg, sizeof(int), 1, 0) > 0) {
-                       fprintf(stderr, "[%s] > Notified with value: %s!\n", "process1", strsignal(msg.signo[0]));
-                       raise(msg.signo[0]);
-                       break;
                }
        }
        else if (signo == SIGTERM) {
                fprintf(stderr, "[%s] > Signalling other processes..\n", "process1");
-               processes->pids[1] = 0;
+               processes->pids[0] = 0;
                notify_other_processes(signo);
 
                fprintf(stderr, "[%s] > Releasing resources\n", "process1");
@@ -117,6 +120,12 @@ void sig_handler(int signo)
                exit(0);
        }
        else if (signo == SIGTSTP) {
+               fprintf(stderr, "[%s] > Signalling other processes..\n", "process1");
+               processes->pids[0] = 0;
+               notify_other_processes(signo);
+//             sleep(1);
+               processes->pids[0] = getpid();
+
                fprintf(stderr, "[%s] > Closing pipe\n", "process1");
                close(write_pipe);
                raise (SIGSTOP);
@@ -124,6 +133,10 @@ void sig_handler(int signo)
        else if (signo == SIGCONT) {
                fprintf(stderr, "[%s] > Opening pipe\n", "process1");
                file_descriptor = open(write_pipe, O_WRONLY);
+               processes->pids[0] = 0;
+               notify_other_processes(signo);
+//             sleep(1);
+               processes->pids[0] = getpid();
        }
 }
 
@@ -179,11 +192,7 @@ int main(void) {
        /**
         * Register message queue to communicate with other processes
         */
-       qkey = getpid();
-       qid_input = msgget(qkey, IPC_CREAT | 0666);
-       
-       qid_output1 = msgget(processes->pids[1], IPC_CREAT | 0666);
-       qid_output2 = msgget(processes->pids[2], IPC_CREAT | 0666);
+       qid = msgget(qkey, IPC_CREAT | 0666);
        
        mkfifo(write_pipe, 0666);