1 files changed, 5 insertions, 21 deletions
diff --git a/src/transformations/hgridshift.cpp b/src/transformations/hgridshift.cpp
index 326bbb13..96b77c20 100644
--- a/src/transformations/hgridshift.cpp
+++ b/src/transformations/hgridshift.cpp
@@ -6,31 +6,16 @@
 #include <time.h>
 
 #include "proj_internal.h"
+#include "proj/internal/mutex.hpp"
 #include "grids.hpp"
 
 PROJ_HEAD(hgridshift, "Horizontal grid shift");
 
-using namespace NS_PROJ;
-
-#ifdef __MINGW32__
-// mingw32-win32 doesn't implement std::mutex
-namespace {
-class MyMutex {
-  public:
-    // cppcheck-suppress functionStatic
-    void lock() { pj_acquire_lock(); }
-    // cppcheck-suppress functionStatic
-    void unlock() { pj_release_lock(); }
-};
-}
-#else
-#include <mutex>
-#define MyMutex std::mutex
-#endif
-
-static MyMutex gMutex{};
+static NS_PROJ::mutex gMutex{};
 static std::set<std::string> gKnownGrids{};
 
+using namespace NS_PROJ;
+
 namespace { // anonymous namespace
 struct hgridshiftData {
     double t_final = 0;
@@ -208,7 +193,6 @@ PJ *TRANSFORMATION(hgridshift,0) {
 }
 
 void pj_clear_hgridshift_knowngrids_cache() {
-    gMutex.lock();
+    NS_PROJ::lock_guard<NS_PROJ::mutex> lock(gMutex);
     gKnownGrids.clear();
-    gMutex.unlock();
 }