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gaia/shared/js/async_semaphore.js

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+'use strict';
+
+(function(exports) {
+  var AsyncSemaphore = function as_contructor() {
+    if (!(this instanceof AsyncSemaphore)) {
+      return new AsyncSemaphore();
+    }
+    this._init();
+  };
+
+  // Do not call '_init' and '_execute' directly from outside of AsyncSemaphore
+  AsyncSemaphore.prototype = {
+    _init: function as_init() {
+      // Please don't modify these value directly from outside of AsyncSemaphore
+      this.pendingTasks = [];
+      this.semaphore = 0;
+    },
+    _execute: function as_execute() {
+      var task,
+        context;
+      if (this.semaphore <= 0) {
+        while (this.pendingTasks.length > 0) {
+          task = this.pendingTasks.shift();
+          context = task.context || this;
+          if (task && task.callback && typeof task.callback === 'function') {
+            task.callback.call(context, task.args);
+          }
+        }
+      }
+    },
+    v: function as_v(num) {
+      if (!num) {
+        num = 1;
+      }
+      this.semaphore += num;
+    },
+    p: function as_p() {
+      this.semaphore -= 1;
+      if (this.semaphore < 0) {
+        this.semaphore = 0;
+      }
+      this._execute();
+    },
+    wait: function as_wait(callback, context, args) {
+      this.pendingTasks.push({
+        callback: callback,
+        context: context,
+        args: args
+      });
+      this._execute();
+    },
+    getValue: function as_getValue() {
+      return this.semaphore;
+    },
+    getTasksLength: function as_getTasksLength() {
+      return this.pendingTasks.length;
+    }
+  };
+
+  exports.AsyncSemaphore = AsyncSemaphore;
+}(window));