More work on synchronous/asynchronous operations.

[bluesky.git] / bluesky / store.c

diff --git a/bluesky/store.c b/bluesky/store.c
index 13a080f..7c8123c 100644 (file)
--- a/bluesky/store.c
+++ b/bluesky/store.c
@@ -20,6 +20,10 @@
 struct _BlueSkyStore {
     const BlueSkyStoreImplementation *impl;
     gpointer handle;
+
+    GMutex *lock;
+    GCond *cond_idle;
+    int pending;                /* Count of operations not yet complete. */
 };
 
 GHashTable *store_implementations;
@@ -45,6 +49,9 @@ BlueSkyStore *bluesky_store_new(const gchar *type)
     BlueSkyStore *store = g_new(BlueSkyStore, 1);
     store->impl = impl;
     store->handle = handle;
+    store->lock = g_mutex_new();
+    store->cond_idle = g_cond_new();
+    store->pending = 0;
     return store;
 }
 
@@ -62,6 +69,7 @@ BlueSkyStoreAsync *bluesky_store_async_new(BlueSkyStore *store)
     async->store = store;
     async->lock = g_mutex_new();
     async->completion_cond = g_cond_new();
+    async->refcount = 1;
     async->status = ASYNC_NEW;
     async->op = STORE_OP_NONE;
     async->key = NULL;
@@ -72,6 +80,30 @@ BlueSkyStoreAsync *bluesky_store_async_new(BlueSkyStore *store)
     return async;
 }
 
+void bluesky_store_async_ref(BlueSkyStoreAsync *async)
+{
+    if (async == NULL)
+        return;
+
+    g_atomic_int_inc(&async->refcount);
+}
+
+void bluesky_store_async_unref(BlueSkyStoreAsync *async)
+{
+    if (async == NULL)
+        return;
+
+    if (g_atomic_int_dec_and_test(&async->refcount)) {
+        async->store->impl->cleanup(async->store->handle, async);
+        g_mutex_free(async->lock);
+        g_cond_free(async->completion_cond);
+        g_free(async->key);
+        bluesky_string_unref(async->data);
+        g_free(async);
+        g_print("Freed async\n");
+    }
+}
+
 /* Block until the given operation has completed. */
 void bluesky_store_async_wait(BlueSkyStoreAsync *async)
 {
@@ -87,6 +119,8 @@ void bluesky_store_async_wait(BlueSkyStoreAsync *async)
     while (async->status != ASYNC_COMPLETE) {
         g_cond_wait(async->completion_cond, async->lock);
     }
+
+    g_mutex_unlock(async->lock);
 }
 
 /* Mark an asynchronous operation as complete.  This should only be called by
@@ -94,22 +128,56 @@ void bluesky_store_async_wait(BlueSkyStoreAsync *async)
  * function. */
 void bluesky_store_async_mark_complete(BlueSkyStoreAsync *async)
 {
+    if (async->status != ASYNC_COMPLETE) {
+        g_mutex_lock(async->store->lock);
+        async->store->pending--;
+        if (async->store->pending == 0)
+            g_cond_broadcast(async->store->cond_idle);
+        g_mutex_unlock(async->store->lock);
+    }
+
     async->status = ASYNC_COMPLETE;
     g_cond_broadcast(async->completion_cond);
 }
 
+void bluesky_store_async_submit(BlueSkyStoreAsync *async)
+{
+    BlueSkyStore *store = async->store;
+
+    g_mutex_lock(async->store->lock);
+    async->store->pending++;
+    g_mutex_unlock(async->store->lock);
+
+    store->impl->submit(store->handle, async);
+
+    if (bluesky_options.synchronous_stores)
+        bluesky_store_async_wait(async);
+}
+
+void bluesky_store_sync(BlueSkyStore *store)
+{
+    g_mutex_lock(store->lock);
+    g_print("Waiting for pending store operations to complete...\n");
+    while (store->pending > 0) {
+        g_cond_wait(store->cond_idle, store->lock);
+    }
+    g_mutex_unlock(store->lock);
+    g_print("Operations are complete.\n");
+}
+
 /* Convenience wrappers that perform a single operation synchronously. */
 BlueSkyRCStr *bluesky_store_get(BlueSkyStore *store, const gchar *key)
 {
     BlueSkyStoreAsync *async = bluesky_store_async_new(store);
     async->op = STORE_OP_GET;
     async->key = g_strdup(key);
-    store->impl->submit(store->handle, async);
+    bluesky_store_async_submit(async);
 
     bluesky_store_async_wait(async);
 
     BlueSkyRCStr *data = async->data;
     bluesky_string_ref(data);
+    bluesky_store_async_unref(async);
     return data;
 }
 
@@ -121,9 +189,10 @@ void bluesky_store_put(BlueSkyStore *store,
     async->key = g_strdup(key);
     bluesky_string_ref(val);
     async->data = val;
-    store->impl->submit(store->handle, async);
+    bluesky_store_async_submit(async);
 
     bluesky_store_async_wait(async);
+    bluesky_store_async_unref(async);
 }
 
 #if 0