From aa7b6ad5b0e94004a0e27007fcdf807baa34bce0 Mon Sep 17 00:00:00 2001
From: waker <wakeroid@gmail.com>
Date: Sun, 4 Aug 2013 19:32:58 +0200
Subject: added new API for querying/handling background jobs

---
 deadbeef.h |  8 ++++++++
 plugins.c  | 31 +++++++++++++++++++++++++++++++
 plugins.h  |  9 +++++++++
 3 files changed, 48 insertions(+)

diff --git a/deadbeef.h b/deadbeef.h
index 60294d9d..b9d88a12 100644
--- a/deadbeef.h
+++ b/deadbeef.h
@@ -795,9 +795,17 @@ typedef struct {
     // data size must be float[DDB_AUDIO_MEMORY_FRAMES]
     void (*audio_get_waveform_data) (int type, float *data);
 
+    // this is useful to mute/unmute audio, and query the muted status, from
+    // plugins, without touching the volume control
     void (*audio_set_mute) (int mute);
     int (*audio_is_mute) (void);
 
+    // this is useful for prompting a user when he attempts to quit the player
+    // while something is working in background, e.g. the Converter,
+    // and let him finish or cancel the background jobs.
+    void (*background_job_increment) (void);
+    void (*background_job_decrement) (void);
+    int (*have_background_jobs) (void);
 } DB_functions_t;
 
 // NOTE: an item placement must be selected like this
diff --git a/plugins.c b/plugins.c
index a12b026c..f3a92c46 100644
--- a/plugins.c
+++ b/plugins.c
@@ -344,6 +344,9 @@ static DB_functions_t deadbeef_api = {
     .audio_get_waveform_data = audio_get_waveform_data,
     .audio_set_mute = audio_set_mute,
     .audio_is_mute = audio_is_mute,
+    .background_job_increment = background_job_increment,
+    .background_job_decrement = background_job_decrement,
+    .have_background_jobs = have_background_jobs,
 };
 
 DB_functions_t *deadbeef = &deadbeef_api;
@@ -407,6 +410,9 @@ DB_output_t *output_plugin = NULL;
 #define MAX_PLAYLIST_PLUGINS 10
 DB_playlist_t *g_playlist_plugins[MAX_PLAYLIST_PLUGINS+1];
 
+static uintptr_t background_jobs_mutex;
+static int num_background_jobs;
+
 void
 plug_md5 (uint8_t sig[16], const char *in, int len) {
     md5_state_t st;
@@ -786,6 +792,8 @@ plug_load_all (void) {
     trace ("\033[0;31mDISABLE_VERSIONCHECK=1! do not distribute!\033[0;m\n");
 #endif
 
+    background_jobs_mutex = mutex_create ();
+
     const char *dirname = deadbeef->get_plugin_dir ();
 
 #ifndef ANDROID
@@ -1062,6 +1070,10 @@ plug_unload_all (void) {
     memset (g_playlist_plugins, 0, sizeof (g_playlist_plugins));
 
     trace ("all plugins had been unloaded\n");
+    if (background_jobs_mutex) {
+        mutex_free (background_jobs_mutex);
+        background_jobs_mutex = 0;
+    }
 }
 
 void
@@ -1260,3 +1272,22 @@ plug_is_local_file (const char *fname) {
 
     return 1;
 }
+
+void
+background_job_increment (void) {
+    mutex_lock (background_jobs_mutex);
+    num_background_jobs++;
+    mutex_unlock (background_jobs_mutex);
+}
+
+void
+background_job_decrement (void) {
+    mutex_lock (background_jobs_mutex);
+    num_background_jobs--;
+    mutex_unlock (background_jobs_mutex);
+}
+
+int
+have_background_jobs (void) {
+    return num_background_jobs;
+}
diff --git a/plugins.h b/plugins.h
index 1fdb6b82..e05e45f6 100644
--- a/plugins.h
+++ b/plugins.h
@@ -136,4 +136,13 @@ plug_get_gui_names (void);
 void
 plug_event_call (ddb_event_t *ev);
 
+void
+background_job_increment (void);
+
+void
+background_job_decrement (void);
+
+int
+have_background_jobs (void);
+
 #endif // __PLUGINS_H
-- 
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