From 68f62bebeedfefd07789d2be3a88fc1340f4cab0 Mon Sep 17 00:00:00 2001
From: unknown <Francesco Biscani@.esa-ad.esa.int>
Date: Mon, 22 Dec 2008 16:44:10 +0100
Subject: [PATCH] Fix race condition while checking if threads are still
 active.

---
 SolversThreads/SolversThreads.cpp | 2 +-
 main.cpp                          | 3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/SolversThreads/SolversThreads.cpp b/SolversThreads/SolversThreads.cpp
index 2e3bbc1..71161c7 100644
--- a/SolversThreads/SolversThreads.cpp
+++ b/SolversThreads/SolversThreads.cpp
@@ -315,7 +315,7 @@ void *ASAthread(void *data)
 		//log in logfile
 		*(PtrTP->Ptr_log) << PtrTP->generations * deme.size() << " " << (PtrTP->Ptr_pop->extractBestIndividual()).getFitness() << endl;
 		//sinal exit
-		*(PtrTP->isActive) = false;
+		__sync_sub_and_fetch(PtrTP->isActive,1);
 		PtrTP->exit->notify_one();
    }
    return 0;
diff --git a/main.cpp b/main.cpp
index 565903b..da6d6b3 100644
--- a/main.cpp
+++ b/main.cpp
@@ -639,7 +639,8 @@ while (choice != -1) {
                 }
 				//The main cycle has finished: we wait for all threads to finish
 				for (int i=0; i<islandsN;i++){
-					while (*data[i].isActive); //infinite loop if a thread never ends
+				    //infinite loop if a thread never ends
+				    while (__sync_bool_compare_and_swap(data[i].isActive,1,1));
 				}
 
 				//deallocate memory
-- 
2.11.4.GIT