Updated 'create_thread' function comments.

[nit.git] / lib / pnacl.nit

diff --git a/lib/pnacl.nit b/lib/pnacl.nit
index a63e7ca..42a6b8c 100644 (file)
--- a/lib/pnacl.nit
+++ b/lib/pnacl.nit
@@ -307,17 +307,14 @@ module pnacl is platform
        /* This function is called by Nit when using check_dictionary,
        returns the dictionary at the head of the queue. */
        void* NitHandleDictionary() {
-               while(1) {
-                       struct PP_Var dictionary = DequeueDictionary();
-                       PnaclApp_handle_dictionary(app, &dictionary);
-               }
+               struct PP_Var dictionary = DequeueDictionary();
+               PnaclApp_handle_dictionary(app, &dictionary);
+               return 0;
        }
 
        /* This function is called By Nit when waiting for a user input. */
        char* NitHandleMessage() {
-               while(1) {
-                       return DequeueMessage();
-               }
+               return DequeueMessage();
        }
 
        /* Entry point */
@@ -637,11 +634,8 @@ class PnaclStream
 
        redef fun eof do return end_reached
 
-       # write method sends now a message to JS.
-       redef fun write(s: Text)
-       do
-               app.post_message s.to_s
-       end
+       # Redefintion of 'write' to send messages to the browser.
+       redef fun write(s: Text) do app.post_message s.to_s
 
        redef fun is_writable: Bool do return true
 
@@ -718,9 +712,46 @@ class PnaclApp
 
        # Checks if there is a dictionary in the queue, and if so the dictionary is handled automatically.
        fun check_dictionary `{
-               while(1) {
-                       NitHandleDictionary();
-               }
+               NitHandleDictionary();
+       `}
+
+       # Infinite loop on check_dictionary
+       fun run
+       do
+               loop
+                       check_dictionary
+               end
+       end
+end
+
+redef interface Object
+       # Creates a new thread for Nit.
+       #
+       # This function launches the Nit main on a new thread.
+       # Its purpose is to allow Nit to be still operational after an exit when needed,
+       # because reloading the page may not be an option.
+       #
+       # Should only be used within the 'exit' before stopping the current thread
+       # when the Nit execution causes a crash.
+       #
+       # REQUIRE: g_nit_thread and WrapperNitMain are set.
+       fun create_thread `{
+               pthread_create(&g_nit_thread, NULL, &WrapperNitMain, NULL);
+       `}
+
+       # Calls 'pthread_exit on current thread.
+        fun exit_thread(exit_value: Int) `{
+               pthread_exit((void*) exit_value);
        `}
+
+       # Redef of exit in order to avoid the module to crash by terminating only the Nit thread.
+       redef fun exit(exit_value: Int)
+       do
+               var dictionary = new PepperDictionary
+               dictionary["exit"] = exit_value
+               app.post_dictionary dictionary
+               exit_thread exit_value
+       end
 end
+
 fun app: PnaclApp do return once new PnaclApp