From 22a12e2995b1c59161214d26da631af26c4ea1c1 Mon Sep 17 00:00:00 2001
From: PowerUser64 <blake@blakenorth.net>
Date: Mon, 25 Nov 2024 22:42:17 -0800
Subject: [PATCH] mutex: use cerr for printing debug info

---
 main.cpp | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/main.cpp b/main.cpp
index d17dac0..a1e1ca0 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,7 +6,7 @@
 #include <cstddef> // size_t
 #include <cstring> // memset
 #include <ctime>
-#include <iostream> // cout
+#include <iostream> // cerr
 #include <vector>   // vector
 
 // used for threads
@@ -50,7 +50,7 @@ void *thread_task_increment(const struct thread_data &thread) {
 
   SLEEP;
 
-  std::cout << "Hello from thread " << thread.id << "! (before run loop)"
+  std::cerr << "Hello from thread " << thread.id << "! (before run loop)"
             << std::endl;
 
   SLEEP;
@@ -61,7 +61,7 @@ void *thread_task_increment(const struct thread_data &thread) {
 
     // non-mutex operations
     {
-      std::cout << "Hello from thread " << thread.id
+      std::cerr << "Hello from thread " << thread.id
                 << "! (inside run loop, before mutex)" << std::endl;
     }
 
@@ -83,7 +83,7 @@ void *thread_task_increment(const struct thread_data &thread) {
 
       // enter the mutex
 
-      std::cout << "Hello from thread " << thread.id
+      std::cerr << "Hello from thread " << thread.id
                 << "! (inside run loop, inside mutex)" << std::endl;
 
       SLEEP;
@@ -105,7 +105,7 @@ void *thread_task_increment(const struct thread_data &thread) {
     }
   }
 
-  std::cout << "Hello from thread " << thread.id << "! (done)" << std::endl;
+  std::cerr << "Hello from thread " << thread.id << "! (done)" << std::endl;
 
   pthread_exit(nullptr);
 }
@@ -155,7 +155,7 @@ void do_threading(struct thread_group threads) {
     SLEEP;
   }
 
-  std::cout << "Threads have been spawned." << std::endl;
+  std::cerr << "Threads have been spawned." << std::endl;
 
   // loop until all threads are done
   for (size_t finished_threads = 0; finished_threads < threads.total_threads;) {