From 45d68f9f6d832095fb15139d43e55f905aee1b33 Mon Sep 17 00:00:00 2001
From: marekkokot <marek.koki@gmail.com>
Date: Thu, 18 Jan 2024 22:55:34 +0100
Subject: [PATCH] fix for multiple kmc instances in a single process

---
 kmc_core/small_sort.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/kmc_core/small_sort.h b/kmc_core/small_sort.h
index 10215f2..800e295 100644
--- a/kmc_core/small_sort.h
+++ b/kmc_core/small_sort.h
@@ -153,13 +153,25 @@ class CSmallSort {
 
 	static void Adjust(uint32 max_small_size = 256)
 	{
+		static bool is_adjusted = false;
+		if (is_adjusted)
+			return;
+
+		static std::mutex mtx;
+		std::lock_guard<std::mutex> lck(mtx);
+		if (is_adjusted)
+			return;
+
 		PrepareArray();
 		EvaluateAlgorithms(max_small_size);
 		SmoothTimes();
 		SelectBestSorters();
 		ReleaseArray();
+
+		is_adjusted = true;
 	}
 
+
 	static void Sort(CKmer<SIZE> *ptr, uint32 size)
 	{
 		sorters[size](ptr, size);