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A2/fhistogram-mt.c

@@ -14,7 +14,7 @@
 
 #include "job_queue.h"
 
-pthread_mutex_t stdout_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 
 // err.h contains various nonstandard BSD extensions, but they are
 // very handy.
@@ -26,7 +26,12 @@ int global_histogram[8] = { 0 };
 
 struct job_queue q;
 
-
+void update_histogram_mt(int local_histogram[8]) {
+    pthread_mutex_lock(&mutex);
+    merge_histogram(local_histogram, global_histogram);
+    print_histogram(global_histogram);
+    pthread_mutex_unlock(&mutex);
+}
 
 int fhistogram_mt(char const *path) {
     FILE *f = fopen(path, "r");