Turn On/Off pids on notifying other processes.

[wsti_so.git] / src / process3.c

diff --git a/src/process3.c b/src/process3.c
index 28ecce5dcb6b4076c56447d2d9d1f8a3260e0f40..1357c91b5ab5bedd439948ac3a8c9780abe128e6 100644 (file)
--- a/src/process3.c
+++ b/src/process3.c
@@ -35,7 +35,8 @@ key_t shmkey = 18912;
 int shmid;
 
 /**
- * Message shared by processes. Contains array of process IDs
+ * Structure holding array of process IDs.
+ * Message is shared by processes. Contains array of process IDs
  */
 struct message {
        pid_t pids[3];
@@ -44,11 +45,24 @@ struct message {
 struct message * processes = NULL;
 
 /**
- * Message queue variables
+ * Message Queue variables
+ */
+
+/**
+ * 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];
@@ -86,10 +100,6 @@ void sig_handler(int signo)
                        fprintf(stderr, "[%s] > Notified with value: %s!\n", "process3", strsignal(msg.signo[0]));
                        raise(msg.signo[0]);
                }
-               else if (msgrcv(qid, &msg, sizeof(int), 3, 0) > 0) {
-                       fprintf(stderr, "[%s] > Notified with value: %s!\n", "process3", strsignal(msg.signo[0]));
-                       raise(msg.signo[0]);
-               }
        }
        else if (signo == SIGTERM) {
                fprintf(stderr, "[%s] > Signalling other processes..\n", "process3");
@@ -102,7 +112,10 @@ void sig_handler(int signo)
        }
        else if (signo == SIGTSTP) {
                fprintf(stderr, "[%s] > Signalling other processes..\n", "process3");
+               processes->pids[2] = 0;
                notify_other_processes(signo);
+//             sleep(1);
+               processes->pids[2] = getpid();
 
                fprintf(stderr, "[%s] > Closing pipe\n", "process3");
                close(read_descriptor);
@@ -110,7 +123,10 @@ void sig_handler(int signo)
        }
        else if (signo == SIGCONT) {
                fprintf(stderr, "[%s] > Signalling other processes..\n", "process3");
+               processes->pids[2] = 0;
                notify_other_processes(signo);
+//             sleep(1);
+               processes->pids[2] = getpid();
 
                fprintf(stderr, "[%s] > Opening pipe\n", "process3");
                read_descriptor = open(read_pipe, O_RDONLY);