stuff

Examples/pthreads/pthreads1.c

@@ -0,0 +1,48 @@
+/*
+ * 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;
+}