I need to implement a timer that checks for conditions every 35 seconds. My program is using IPC schemes to communicate information back and forth between client and server processes. The problem is that I am running msgrcv() function in a loop, which pauses the loop until it finds a message, which is no good because I need the timer to always be checking if a client has stopped sending messages. (if it only checks when it receives a message, this will be useless...)
The problem may seem unclear, but the basics of what I need is a way to implement a Watchdog timer that will check a condition every 35 seconds.
I currently have this code:
time_t start = time(NULL);//Enter main processing loopwhile(running){ size_t size = sizeof(StatusMessage) - sizeof(long); if(msgrcv(messageID, &statusMessage, size, 0, 0) != -1) { printf("(SERVER) Message Data (ID #%ld) = %d : %s\n", statusMessage.machineID, statusMessage.status_code, statusMessage.status); masterList->msgQueueID = messageID; int numDCs = ++masterList->numberOfDCs; masterList->dc[numDCs].dcProcessID = (pid_t) statusMessage.machineID; masterList->dc[numDCs].lastTimeHeardFrom = 1000; printf("%d\n", masterList->numberOfDCs); } printf("%.2f\n", (double) (time(NULL) - start));}The only problem is as I stated before, the code to check how much time has passed, won't be reached if there is no message to come in, as the msgrcv function will hold the process.
I hope I am making sense, and that someone will be able to assist me in my problem.
