diff --git a/test/test-reflock.c b/test/test-reflock.c
new file mode 100644
index 0000000..f63571c
--- /dev/null
+++ b/test/test-reflock.c
@@ -0,0 +1,159 @@
+#include <assert.h>
+#include <process.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "init.h"
+#include "reflock.h"
+#include "util.h"
+#include "win.h"
+
+#define THREAD_COUNT 20
+#define TEST_ITERATIONS 10
+#define TEST_LENGTH 1000
+
+typedef unsigned(__stdcall* thread_entry_t)(void* arg);
+
+typedef struct test_context {
+  reflock_t lock;
+  volatile bool ref_valid;
+  volatile bool content_valid;
+  volatile bool stop;
+} test_context_t;
+
+static void yield(void) {
+  int count = rand() % THREAD_COUNT;
+  while (count--)
+    Sleep(0);
+}
+
+static unsigned int __stdcall thread1(void* arg) {
+  test_context_t* context = arg;
+  reflock_token_t token;
+  uint64_t lock_count = 0;
+
+  token = reflock_ref_and_announce_lock(&context->lock);
+
+  yield();
+
+  token = reflock_lock(&context->lock, token);
+
+  context->content_valid = false;
+
+  while (!context->stop) {
+    lock_count++;
+
+    assert(context->ref_valid);
+    assert(!context->content_valid);
+    context->content_valid = true;
+
+    token = reflock_unlock(&context->lock, token);
+
+    yield();
+
+    token = reflock_lock(&context->lock, token);
+
+    assert(context->content_valid);
+    context->content_valid = false;
+  }
+  assert(context->ref_valid);
+  assert(!context->content_valid);
+  context->content_valid = true;
+
+  reflock_unref_and_unlock(&context->lock, token);
+
+  assert(lock_count > 100); /* Hopefully a lot more. */
+
+  return 0;
+}
+
+static unsigned int __stdcall thread2(void* arg) {
+  test_context_t* context = arg;
+  uint64_t lock_count = 0;
+
+  while (!context->stop) {
+    reflock_token_t token = reflock_ref_and_announce_lock(&context->lock);
+
+    yield();
+
+    token = reflock_lock(&context->lock, token);
+
+    assert(context->ref_valid);
+    assert(context->content_valid);
+    context->content_valid = false;
+
+    lock_count++;
+
+    yield();
+
+    assert(context->ref_valid);
+    assert(!context->content_valid);
+    context->content_valid = true;
+
+    reflock_unref_and_unlock(&context->lock, token);
+  }
+
+  assert(lock_count > 100); /* Hopefully a lot more. */
+
+  return 0;
+}
+
+static void delete_ref(test_context_t* context) {
+  reflock_token_t token;
+
+  token = reflock_announce_delete(&context->lock);
+
+  context->stop = true;
+
+  yield();
+
+  reflock_delete(&context->lock, token);
+
+  assert(context->content_valid);
+  context->content_valid = false;
+  assert(context->ref_valid);
+  context->ref_valid = false;
+}
+
+static void run_test_iteration(void) {
+  test_context_t context;
+  HANDLE threads[THREAD_COUNT];
+
+  reflock_init(&context.lock);
+
+  context.ref_valid = true;
+  context.content_valid = true;
+  context.stop = false;
+
+  for (size_t i = 0; i < array_count(threads); i++) {
+    thread_entry_t thread_entry = (i % 2 == 0) ? thread1 : thread2;
+    HANDLE thread =
+        (HANDLE) _beginthreadex(NULL, 0, thread_entry, &context, 0, NULL);
+    assert(thread != INVALID_HANDLE_VALUE);
+    threads[i] = thread;
+  }
+
+  Sleep(TEST_LENGTH);
+
+  delete_ref(&context);
+
+  for (size_t i = 0; i < array_count(threads); i++) {
+    HANDLE thread = threads[i];
+    DWORD wr = WaitForSingleObject(thread, INFINITE);
+    assert(wr == WAIT_OBJECT_0);
+    CloseHandle(thread);
+  }
+}
+
+int main(void) {
+  if (init() < 0)
+    return 0;
+
+  for (int i = 0; i < TEST_ITERATIONS; i++) {
+    printf("Iteration %d of %d\n", i + 1, TEST_ITERATIONS);
+    run_test_iteration();
+  }
+
+  return 0;
+}