Run pthread_atfork only once

Close #7704

native/src/core/daemon.cpp

@@ -433,6 +433,7 @@ static void daemon_entry() {
     register_poll(&main_socket_pfd, handle_request);
 
     // Loop forever to listen for requests
+    init_thread_pool();
     poll_loop();
 }
 

native/src/core/include/core.hpp

@@ -52,6 +52,7 @@ void unregister_poll(int fd, bool auto_close);
 void clear_poll();
 
 // Thread pool
+void init_thread_pool();
 void exec_task(std::function<void()> &&task);
 
 // Daemon handlers

native/src/core/thread.cpp

@@ -42,8 +42,6 @@ static void reset_pool() {
 }
 
 static void *thread_pool_loop(void * const is_core_pool) {
-    pthread_atfork(nullptr, nullptr, &reset_pool);
-
     // Block all signals
     sigset_t mask;
     sigfillset(&mask);
@@ -83,6 +81,10 @@ static void *thread_pool_loop(void * const is_core_pool) {
     }
 }
 
+void init_thread_pool() {
+    pthread_atfork(nullptr, nullptr, &reset_pool);
+}
+
 void exec_task(function<void()> &&task) {
     mutex_guard g(lock);
     pending_task.swap(task);

native/src/core/zygisk/main.cpp

@@ -15,6 +15,8 @@ static void zygiskd(int socket) {
     if (getuid() != 0 || fcntl(socket, F_GETFD) < 0)
         exit(-1);
 
+    init_thread_pool();
+
 #if defined(__LP64__)
     set_nice_name("zygiskd64");
     LOGI("* Launching zygiskd64\n");