From 4003fd7c5fca8eaae70ba79ad883f93c50baf797 Mon Sep 17 00:00:00 2001
From: Allanis <allanis@saracraft.net>
Date: Mon, 10 Mar 2014 20:54:40 +0000
Subject: [PATCH] [Change] FFUUUUU!! Do *NOT* call MIX_* functions from
 callbacks, especially when locked! Jeezus!

---
 src/music.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++------
 src/music.h |  5 ++--
 src/sound.c |  5 ++++
 3 files changed, 73 insertions(+), 11 deletions(-)

diff --git a/src/music.c b/src/music.c
index f9c88e9..1dc92f6 100644
--- a/src/music.c
+++ b/src/music.c
@@ -4,6 +4,7 @@
  */
 
 #include <SDL/SDL_mixer.h>
+#include <SDL/SDL_mutex.h>
 #include <SDL.h>
 
 #include "llua.h"
@@ -22,9 +23,21 @@
 
 int music_disabled = 0; /**< Whether or not music is disabled. */
 
+/* Handle if music should run Lua script. Must be locked to ensure same
+ * behaviour always!
+ */
+static SDL_mutex* music_lock = NULL;  /**< Lock for music_runLua so it doesn't
+                                       run twise in a row with weird
+                                       results.
+                                       DO NOT CALL MIX* FUNCTIONS WHEN
+                                       LOCKED!!!! FUCK!!!! */
+static int music_runchoose = 0;       /**< Whether or not music should run the choose function. */
+static char music_situation[PATH_MAX]; /**< What situation music is in. */
+
 /* Global music lua. */
 static lua_State* music_lua = NULL; /**< The Lua music control state. */
 /* Functions. */
+static int music_runLua(char* situation);
 static int musicL_load(lua_State* L);
 static int musicL_play(lua_State* L);
 static int musicL_stop(lua_State* L);
@@ -51,6 +64,41 @@ static void music_rechoose(void);
 static int music_luaInit(void);
 static void music_luaQuit(void);
 
+/**
+ * @brief Update the music.
+ */
+void music_update(void) {
+  char buf[PATH_MAX];
+
+  /* Lock music and see if it needs to update. */
+  SDL_mutexP(music_lock);
+  if(music_runchoose == 0) {
+    SDL_mutexV(music_lock);
+    return;
+  }
+
+  music_runchoose = 0;
+  strncpy(buf, music_situation, PATH_MAX);
+  SDL_mutexV(music_lock);
+
+  music_runLua(buf);
+}
+
+/**
+ * @brief Run the Lua music choose function.
+ *    @param situation Situation in to choose music for.
+ *    @return 0 on success.
+ */
+static int music_runLua(char* situation) {
+  /* Run the choose function in Lua. */
+  lua_getglobal(music_lua, "choose");
+  lua_pushstring(music_lua, situation);
+  if(lua_pcall(music_lua, 1, 0, 0)) /* Error has occured. */
+    WARN("Error while choosing music: %s", (char*)lua_tostring(music_lua, -1));
+
+  return 0;
+}
+
 /**
  * @fn int music init(void)
  *
@@ -64,6 +112,9 @@ int music_init(void) {
   if(music_luaInit() < 0) return -1;
   music_volume(0.8);
 
+  /* Create the lock. */
+  music_lock = SDL_CreateMutex();
+
   return 0;
 }
 
@@ -74,6 +125,12 @@ int music_init(void) {
  */
 void music_exit(void) {
   music_free();
+
+  /* Destroy the lock. */
+  if(music_lock != NULL) {
+    SDL_DestroyMutex(music_lock);
+    music_lock = NULL;
+  }
 }
 
 /**
@@ -303,13 +360,8 @@ int lua_loadMusic(lua_State* L, int read_only) {
 int music_choose(char* situation) {
   if(music_disabled) return 0;
 
-  lua_getglobal(music_lua, "choose");
-  lua_pushstring(music_lua, situation);
-  if(lua_pcall(music_lua, 1, 0, 0)) {
-    /* Error occured. */
-    WARN("Error while choosing music: %s", (char*)lua_tostring(music_lua, -1));
-    return -1;
-  }
+  music_runLua(situation);
+
   return 0;
 }
 
@@ -317,9 +369,15 @@ int music_choose(char* situation) {
  * @fn static void music_rechoose(void)
  *
  * @brief Attempts to rechoose the music.
+ *
+ * ARGH! DO NOT CALL MIX_* FUNCTIONS FROM WITHIN THE CALLBACKS!
  */
 static void music_rechoose(void) {
-  music_choose("idle");
+  /* Lock so it doesn't run in between an update. */
+  SDL_mutexP(music_lock);
+  music_runchoose = 1;
+  strncpy(music_situation, "idle", PATH_MAX);
+  SDL_mutexV(music_lock);
 }
 
 /* The music lua functions. */
diff --git a/src/music.h b/src/music.h
index 6c15edb..b02519f 100644
--- a/src/music.h
+++ b/src/music.h
@@ -3,9 +3,8 @@
 
 extern int music_disabled;
 
-/* Thread. */
-int music_thread(void* unused);
-void music_kill(void);
+/* Updating. */
+void music_update(void);
 
 /* Init/Exit. */
 int music_init(void);
diff --git a/src/sound.c b/src/sound.c
index 40eddd9..5837980 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -345,6 +345,9 @@ int sound_updatePos(int voice, double x, double y) {
 int sound_update(void) {
   alVoice* v, *tv;
 
+  /* Update music if needed. */
+  music_update();
+
   if(sound_disabled) return 0;
 
   if(voice_active == NULL) return 0;
@@ -627,6 +630,8 @@ void sound_stopGroup(int group) {
  * @fn static void voice_markStopped(int channel)
  *
  * @brief Mark the voice to which channel belongs to as stopped.
+ *
+ * URGH! DO NOT CALL MIX_* FUNCTIONS FROM CALLBACKS!
  */
 static void voice_markStopped(int channel) {
   alVoice* v;