Tutorial4 Threads
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Threads are lightweight processes that exist within a process and share most of the process resources like memory and file descriptors. Threads have their own independent flow of control and maintain their own stack pointer, registers, and scheduling properties. The pthreads API provides functions for creating and managing threads in UNIX/Linux environments. Pthreads allow creating threads that execute concurrently and share resources.
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#include
#include
using namespace std;
void *routineName(void *arg)
{
// TODO: Add code that implements
// the thread\'s functionality
cout << \"Thread is running...\" << endl;
return 0;
}
int main()
{
pthread_t id;
int rc;
int ints;
for(int x; x<10; x++)
{
cout << \"Enter Integer: \" <>
}
rc = pthread_create(&id, NULL, routineName, NULL);
if (rc){
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return -1;
}
pthread_exit(0);
}
Solution
#include
#include
#include
using namespace std;
int ints[10];
//Method to count negatives in the input array
void *countNegatives(void*){
int count = 0;
for(int i=0;i<10;i++){
if(ints[i]<0){
count++;
}
}
cout<<\"Number of negatives: \"<=0;i--){
cout<> ints[x];
}
//Creating pthread to countNegatives
rc = pthread_create(&t1, NULL, countNegatives, NULL);
if(rc){
cout << \"Error:unable to create thread,\" << rc << endl;
}
//Adding delay
sleep(1);
//Creating pthread to compute average
rc = pthread_create(&t2, NULL, average, NULL);
if(rc){
cout << \"Error:unable to create thread,\" << rc << endl;
}
//Adding delay
sleep(1);
//Creating pthread to print in reverse
rc = pthread_create(&t3, NULL, reverse, NULL);
if(rc){
cout << \"Error:unable to create thread,\" << rc << endl;
}
//Adding delay
sleep(1);
void* status;
//waiting for t1 to join
rc = pthread_join(t1,&status);
if(rc){
cout << \"Error:unable to join,\" << rc << endl;
}
//waiting for t2 to join
rc = pthread_join(t2,&status);
if(rc){
cout << \"Error:unable to join,\" << rc << endl;
}
//waiting for t3 to join
rc = pthread_join(t3,&status);
if(rc){
cout << \"Error:unable to join,\" << rc << endl;
}
pthread_exit(0);
}.
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