new files

Task/Checkpoint-synchronization/C/checkpoint-synchronization.c

@@ -0,0 +1,31 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <omp.h>
+
+int main()
+{
+        int jobs = 41, tid;
+        omp_set_num_threads(5);
+
+        #pragma omp parallel shared(jobs) private(tid)
+        {
+                tid = omp_get_thread_num();
+                while (jobs > 0) {
+                        /* this is the checkpoint */
+                        #pragma omp barrier
+                        if (!jobs) break;
+
+                        printf("%d: taking job %d\n", tid, jobs--);
+                        usleep(100000 + rand() / (double) RAND_MAX * 3000000);
+                        printf("%d: done job\n", tid);
+                }
+
+                printf("[%d] leaving\n", tid);
+
+                /* this stops jobless thread from exiting early and killing workers */
+                #pragma omp barrier
+        }
+
+        return 0;
+}