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2013-10-07T09:43:41.960
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There is a code snippet below that represents how I would implement it. You should also take a look at pthread_key_create, pthread_getspecific and pthread_setspecific. This is a set of functions that allow you to have data, specific to each thread, stored in the thread's memory context. It may come in handy for in your code, later on. <pre><code>typedef struct{ long fid; int StartState; int flyTime; } FLIGHTS; FLIGHTS** flights = new FLIGHTS*[NUM_THREADS]; pthread_key_t pkey: void *FlightID(void *flightid){ long fid; fid = (long)flightid; FLIGHTS* flight = new FLIGHTS(); flight->fid = fid; flights[fid] = flight; pthread_setspecific(pkey, flight); int startState; for (int i=0; i<=NUM_THREADS; i++){ startState = rand() % 1+2; } std::string start; if(startState == 1){ start = "Taking off"; } if(startState == 2){ start = "Landing"; } for (int t=0; t<NUM_THREADS; t++){ std::cout << "Start State for Flight# " << fid << " is " << start << std::endl; } flight->StartState = startState; } int main(int argc, char* argv[]) { pthread_key_create(&pkey, NULL); for (t=1; t<=NUM_THREADS; t++){ rc = pthread_create(&flights[t], NULL, FlightID, (void *)t); if (rc){ printf("ERROR: return code from pthread_create() is %d\n", rc); return (-1); } printf("Created flight %1d\n", t); } } </code></pre> Also, I don't know if I'm understanding your code correctly or if you just have some coding errors on it, so I leave you with some questions or remarks that could be mistakes/bugs: 1) You invoke pthread_exit in the start callback function: <pre><code>void *FlightID(void *flightid){ long fid; fid = (long)flightid; pthread_exit(NULL); } </code></pre> 2) You pass to the << operator a function with no return value: <pre><code> std::cout << "Start State for Flight# " << FlightID << " is " << start << std::endl; </code></pre> 3) You invoke the same function 3 times just to get the return value. Shouldn't it be int state = StartState(flights[i]) and then test the state variable value? StartState(flights[t]); //gives every flight a start state <pre><code> if(StartState(flights[t])==1){ std::cout << "Flight # " << &flights[t] << " is listed as waiting at the gate." << std::endl; //go to takeoff function and go through switch case } if(StartState(flights[t])==2){`enter code here` std::cout << "Flight # " << &flights[t] << " is listed as waiting to land." << std::endl; //go to landing function and go through switch case } </code></pre> 4) You can't define a function like this: <pre><code>int StartState(flights[NUM_THREADS]){ </code></pre>
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