1 files changed, 13 insertions, 2 deletions
diff --git a/test/test-stop-threads.c b/test/test-stop-threads.c
index 829e73e..d53d8cd 100644
--- a/test/test-stop-threads.c
+++ b/test/test-stop-threads.c
@@ -4,15 +4,22 @@
 #include <unistd.h>
 #include <pthread.h>
 #include <assert.h>
+/* printf without taking any locks - because they might be taken at stop time */
+#define ulprintf(...) do { \
+    char buf[256]; \
+    int len = sprintf(buf, __VA_ARGS__); \
+    write(1, buf, len); \
+} while(0)
+
 static void *some_thread(void *ip) {
     long i = (long) ip;
     while (1) {
-        printf("Hello from %ld\n", i);
+        ulprintf("Hello from %ld\n", i);
         sleep(1);
     }
 }
 static void replacement() {
-    printf("Bye\n");
+    ulprintf("Bye\n");
     pthread_exit(NULL);
 }
 static uintptr_t patch_callback(void *ctx, UNUSED uintptr_t pc) {
@@ -26,9 +33,13 @@ int main() {
         pthread_create(&pts[i], NULL, some_thread, (void *) i);
     sleep(1);
     void *stop_token;
+    ulprintf("stopping\n");
     assert(!stop_other_threads(&stop_token));
+    ulprintf("stopped\n");
     assert(!apply_pc_patch_callback(stop_token, patch_callback, NULL));
+    ulprintf("resuming\n");
     assert(!resume_other_threads(stop_token));
+    ulprintf("resumed\n");
     void *out;
     for (long i = 0; i < 10; i++)
         assert(!pthread_join(pts[i], &out));