diff --git a/compiler-rt/lib/profile/GCDAProfiling.c b/compiler-rt/lib/profile/GCDAProfiling.c
--- a/compiler-rt/lib/profile/GCDAProfiling.c
+++ b/compiler-rt/lib/profile/GCDAProfiling.c
@@ -74,23 +74,12 @@
 static __inline void gcov_flush_init_once(void) {}
 #else
 #include <windows.h>
-static CRITICAL_SECTION gcov_flush_mutex;
+static SRWLOCK gcov_flush_mutex = SRWLOCK_INIT;
 static __inline void gcov_flush_lock() {
-  EnterCriticalSection(&gcov_flush_mutex);
+  AcquireSRWLockExclusive(&gcov_flush_mutex);
 }
 static __inline void gcov_flush_unlock() {
-  LeaveCriticalSection(&gcov_flush_mutex);
-}
-static __inline void gcov_flush_exit(void) {
-  DeleteCriticalSection(&gcov_flush_mutex);
-}
-static __inline void gcov_flush_init(void) {
-  InitializeCriticalSection(&gcov_flush_mutex);
-  atexit(&gcov_flush_exit);
-}
-static __inline void gcov_flush_init_once(void) {
-  static INIT_ONCE once;
-  InitOnceExecuteOnce(&once, gcov_flush_init, NULL, NULL);
+  ReleaseSRWLockExclusive(&gcov_flush_mutex);
 }
 #endif
 
@@ -651,7 +640,6 @@
 }
 
 void __gcov_flush() {
-  gcov_flush_init_once();
   gcov_flush_lock();
 
   struct fn_node* curr = flush_fn_list.head;