From ce7217797305a0bf1feb7f114ac1a16b3943226f Mon Sep 17 00:00:00 2001
From: Hans Dijkema <hans@dijkewijk.nl>
Date: Sat, 18 Apr 2026 16:31:12 +0200
Subject: [PATCH] events on quit

---
 rktwebview.cpp | 55 ++++++++++++++++++++++++++++++++++++++++++++------
 1 file changed, 49 insertions(+), 6 deletions(-)

diff --git a/rktwebview.cpp b/rktwebview.cpp
index 1da049e..cf27219 100644
--- a/rktwebview.cpp
+++ b/rktwebview.cpp
@@ -37,6 +37,27 @@
 
 //#define DEBUG
 
+#ifdef __linux
+static int sleep_ms(long msec)
+{
+    struct timespec ts;
+    int res;
+
+    if (msec < 0) {
+        return -1;
+    }
+
+    ts.tv_sec = msec / 1000;
+    ts.tv_nsec = (msec % 1000) * 1000000;
+
+    res = nanosleep(&ts, &ts);
+    return res;
+}
+#endif
+
+#define YIELD() sleep_ms(5)
+
+
 /////////////////////////////////////////////////////////////////////
 // Utility functions
 /////////////////////////////////////////////////////////////////////
@@ -70,6 +91,8 @@ typedef struct {
     bool alive_go_on;
     std::thread *alive_thread;
     bool alive_error;
+
+    bool verbose;
 } Handle_t;
 
 Handle_t *handler = nullptr;
@@ -200,22 +223,35 @@ bool runRktWebview(Handle_t *handler)
 
 #define EVT_GUARD_STOP -93273
 #define EVT_ALIVE_ERROR -94328
-#define WAIT_ON_EVENT_MS (10 * 1000)
+#define WAIT_ON_EVENT_MS (2 * 1000)
 #define ALIVE_MESSAGE_INTERVAL_S 5                  // Should be smaller than 10 seconds
 #define MAX_WAIT_RESULT     (2 * 1000)               // Maximum wait in milliseconds for a result per time
 #define MAX_ALIVE_ACK_TIME  (10 * 1000)
 
 void rkt_evt_guard(void)
 {
+    INFO0("Starting rkt_evt_guard\n");
     while(handler->guard_go_on) {
         int wv;
         std::string data;
         if (handler->event_queue->dequeue(wv, data, WAIT_ON_EVENT_MS)) {
+            if (handler->verbose) {
+                INFO2("Got event wv = %d, %s\n", wv, data.c_str());
+            }
             if (wv != EVT_GUARD_STOP) {
-                handler->evt_queue->enqueue(wv, data);
-                handler->evt_cb(1);
+                if (handler->evt_cb != nullptr) {       // evt_cb could be cleared to null
+                    handler->evt_queue->enqueue(wv, data);
+                    handler->evt_cb(1);
+                } else {
+                    INFO0("evt_cb = null\n");
+                }
             } else {
                 INFO0("Got stop message (evt_guard)\n");
+                handler->guard_go_on = false;
+            }
+        } else {
+            if (handler->verbose) {
+                INFO0("Got nothing, verbose = true\n");
             }
         }
     }
@@ -260,13 +296,19 @@ void rkt_webview_cleanup()
         // So we would need to cleanup at exit of racket/drracket.
         // Cleaning up when exiting the current custodian is not enough.
 
+        handler->verbose = true;
+        sleep_ms(3000);
+
         if (handler->valid) {
             if (handler->evt_cb != nullptr) {
-                INFO0("Stopping evt_guard\n");
-                handler->guard_go_on = false;
-                handler->event_queue->enqueue(EVT_GUARD_STOP);
+                INFO0("Stopping evt_guard (enqueuing evt_guard_stop)\n");
                 handler->event_queue->enqueue(EVT_GUARD_STOP);
+                INFO0("yielding current thread and hopefully activating evt_guard thread\n");
+                YIELD();
+                sleep_ms(1000);
+                INFO0("joining guard thread\n");
                 handler->guard_thread->join();
+                INFO0("Deleting guard thread\n");
                 delete handler->guard_thread;
                 handler->guard_thread = nullptr;
             }
@@ -336,6 +378,7 @@ void rkt_webview_init()
         handler->name = buf;
         handler->function_calls = 0;
         handler->events = 0;
+        handler->verbose = true;
 
         handler->shm_size = SHM_SIZE;
         handler->shm = new Shm(handler->name.data(), handler->shm_size, true);