participant: honor explicit /hashthreads=1 (floor of 2 only in auto mode)

The min-2-threads floor applied even when the user explicitly asked
for 1 thread, so /hashthreads=1 silently spawned 2.

(cherry picked from commit a67b9e84f4f7607d307081b4a9873f5d9e78cf8a)

1 files changed, 5 insertions, 2 deletions

diff --git a/src/main.cpp b/src/main.cpp
index 69d9d30..f84f209 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3814,8 +3814,11 @@ connected:
     // ------------------------------------------------------------------
     int nWorkers = nHashThreads > 0 ? nHashThreads
                                     : (int)std::thread::hardware_concurrency();
-    if (nWorkers < 2) nWorkers = 2;
-    if (nHashThreads <= 0) nWorkers -= 1; // leave one core for node + I/O threads
+    if (nHashThreads <= 0) {
+        if (nWorkers < 2) nWorkers = 2;
+        nWorkers -= 1; // leave one core for node + I/O threads
+    }
+    // explicit /hashthreads=N is honored exactly (including 1)
     ParticipantJobShared jobShared;
     std::vector<ParticipantShareHit> shareHits;
     std::mutex shareHitsMtx;