52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
/*
|
|
* pthreads1.c - Shows how to create and wait for single
|
|
* thread (beyond the main thread)
|
|
*/
|
|
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
|
|
int global_value = 10;
|
|
|
|
// thread_routine
|
|
// writes to a global variable - shows that
|
|
// global data is shared between threads
|
|
//
|
|
// NOTE: that parameters and return value are pointers
|
|
void *thread_routine()
|
|
{
|
|
for (int i = 0; i < 10; i++)
|
|
{
|
|
printf("THREAD READS GLOBAL VALUE: %d\n", global_value);
|
|
global_value++;
|
|
sleep(1);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
int main()
|
|
{
|
|
// Create a thread
|
|
pthread_t thr_id;
|
|
if (pthread_create(&thr_id, NULL, thread_routine, NULL) == -1)
|
|
{
|
|
printf("COULD NOT CREATE A THREAD\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
// Write to global data
|
|
for (int i = 0; i < 10; i++)
|
|
{
|
|
printf("PARENT READS GLOBAL: %d\n", global_value);
|
|
sleep(1);
|
|
}
|
|
|
|
// Wait for thread to finish
|
|
pthread_join(thr_id, NULL);
|
|
|
|
// Return success
|
|
return 0;
|
|
}
|