应该如何使用dispatch_debug？ [英] How is dispatch_debug supposed to be used?

问题描述

我在GCD代码中遇到了一个僵局。然后我在头文件< dispatch / object.h> 中看到这个函数 dispatch_debug 。 b
$ b

  / *！ 
 * @function dispatch_debug 
 * 
 * @abstract 
 *以编程方式记录调度对象的调试信息。 
 * 
 * @param对象
 *内省对象。 
 * 
 * @param message 
 *要注册的消息超出内省。 
 * / 
 __OSX_AVAILABLE_STARTING（__ MAC_10_6，__ IPHONE_4_0）
 DISPATCH_EXPORT DISPATCH_NONNULL2 DISPATCH_NOTHROW __attribute __（（__ format __（printf，2,3）））
 void 
 dispatch_debug（dispatch_object_t object， const char * message，...）; 
  

但是我无法做任何事情。我希望它打印出状态和锁定或类似的东西。

这是我如何使用它：

grabber_queue = dispatch_queue_create（com.unpaq.tvguideplus.grabber，NULL）;

  
 dispatch_debug（grabber_queue，grabber queue）; 
  

解决方案

• Grand Central Dispatch（GCD）参考

dispatch_debug

将调试信息记录到控制台日志此信息可用作调试工具，用于在调用dispatch_debug函数时查看调度对象的内部状态（当前引用计数，暂停计数等）。

dispatch_debug将消息发送到syslog。因此，

  grabber_queue = dispatch_queue_create（com.unpaq.tvguideplus.grabber，NULL）; 
 dispatch_debug（grabber_queue，grabber queue）; 
  

此代码将在system.log中打印如下：

  5月13日08:50:17 hostname exefile [53164]：com.unpaq.tvguideplus.grabber [0x6200e10] = {
 xrefcnt = 0x1，refcnt = 0x1，suspend_cnt = 0x0，locked = 0，target = 
 com.apple.root.default-overcommit-priority [0x1af0700]，width = 0x0，running = 0x0，
 barrier = 0}：抓取队列
  

它不会出现在Xcode调试控制台中。您可以在iPhone模拟器上的/Applications/Utilities/Console.app system.log或iPhone，iPod touch和iPad上的Xcode组织者中看到。

顺便说一下，GCD是开源的。它通过 libdispatch 发布。 dispatch_debug包含在src / object.c中。

• src / object.c - dispatch_debug

I am struggling with a deadlock in my GCD code. Then I saw this function dispatch_debug in the header file <dispatch/object.h>.

/*!
 * @function dispatch_debug
 *
 * @abstract
 * Programmatically log debug information about a dispatch object.
 *
 * @param object
 * The object to introspect.
 *
 * @param message
 * The message to log above and beyond the introspection.
 */
__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_4_0)
DISPATCH_EXPORT DISPATCH_NONNULL2 DISPATCH_NOTHROW __attribute__((__format__(printf,2,3)))
void
dispatch_debug(dispatch_object_t object, const char *message, ...);

But I am not able to make it do anything. I was hoping it would print out the state and locks or something like that.

Here is how I use it:

grabber_queue = dispatch_queue_create("com.unpaq.tvguideplus.grabber", NULL);
dispatch_debug(grabber_queue, "grabber queue");

解决方案

• Grand Central Dispatch (GCD) Reference

dispatch_debug

Debug information is logged to the Console log. This information can be useful as a debugging tool to view the internal state (current reference count, suspension count, etc.) of a dispatch object at the time the dispatch_debug function is called.

dispatch_debug sends messages to syslog. So,

grabber_queue = dispatch_queue_create("com.unpaq.tvguideplus.grabber", NULL);
dispatch_debug(grabber_queue, "grabber queue");

this code would print as the following in system.log.

May 13 08:50:17 hostname exefile[53164]: com.unpaq.tvguideplus.grabber[0x6200e10] = {
 xrefcnt = 0x1, refcnt = 0x1, suspend_cnt = 0x0, locked = 0, target =
 com.apple.root.default-overcommit-priority[0x1af0700], width = 0x0, running = 0x0,
 barrier = 0 }: grabber queueMay

It doesn't appear in Xcode debug console. You can see in /Applications/Utilities/Console.app system.log on the iPhone simulator, or in Xcode organizer on iPhone, iPod touch and iPad.

By the way, GCD is open source. It is distributed via libdispatch. dispatch_debug is included in src/object.c.

• src/object.c - dispatch_debug

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