high-performance iOS programming path-pthread-based thread pool

<span id="Label3"></p>Original link--http://blog.sina.com.cn/s/blog_7011f21c0101dkjj.html<p><p>In the OC framework, from Nsoperation to gcd, the dispatch queue is filled with the concept of queues, and the OC Framework helps us to write down the underlying Thread's schedule, and the benefit is that we can focus on the business logic at the top, The downside, of course, is that our control of the underlying dispatch becomes Weaker. The reason for writing this thread pool is also to practice practiced hand, as to the efficiency, after sending to several versions of the line, feedback can Also. Of course, there is room for continuous optimization.</p></p>I. Thread pool process 1. Create a fixed thread at the start of the program as a thread pool, waiting for dispatch 2. Thread scheduling based on task type when thread pool gets to Task 3. Task execution The entire process is simple, so we need to create some necessary structures to support our NEEDS.<p><p></p></p><p><p>typedef void (*TFMETHOD) (void *,short *);</p></p><p><p></p></p><p><p></p></p><p><p>typedef struct s_tftask_content{</p></p><p><p>Tfmethod method;</p></p><p><p>void *arg;</p></p><p><p>Short *cancel_point;</p></p><p><p>struct S_tftask_content *next;</p></p><p><p>}s_tftask_content;</p></p><p><p></p></p><p><p></p></p><p><p>typedef struct s_tfthread_config{</p></p><p><p>pthread_mutex_t mtx;</p></p><p><p>pthread_cond_t cond;</p></p><p><p>}s_tfthread_config;</p></p><p><p></p></p><p><p></p></p><p><p>typedef struct s_tftask{</p></p><p><p>S_tfthread_config config;</p></p><p><p>Short thread_status;</p></p><p><p>S_tftask_content *task_list;</p></p><p><p>}s_tftask;</p></p><p><p></p></p><p><p></p></p><p><p>Enum tfthread_status{</p></p><p><p>tfthread_init=0x0,</p></p><p><p>tfthread_idle,</p></p><p><p>tfthread_inuse,</p></p><p><p>Tfthread_dead</p></p><p><p>};</p></p><p><p></p></p><p><p></p></p><p><p>Enum tftask_type{</p></p><p><p>tftask_net_req=0x0,</p></p><p><p>tftask_first_respond,</p></p><p><p>tftask_assign,</p></p><p><p>Tftask_io_write</p></p><p><p>};</p></p><p><p></p></p><p><p></p></p><p><p>typedef struct s_tfthread{</p></p><p><p>S_tftask *tftask;</p></p><p><p>Char *name;</p></p><p><p>}s_tfthread;</p></p>Two. Implementation 1. Loop creates a thread through pthread_create, creates a S_tfthread object as a thread handle, joins a thread array, S_tftask_content->methord initializes to an empty function, and creates a task execution Function. After the task initialization function is executed, the currently created thread is suspended by the pthread_cond_wait signal in the execution Function.<p><p></p></p><p><p>S_tftask_content *content = (s_tftask_content *) malloc (sizeof (s_tftask_content));</p></p><p><p>content->next= NULL;</p></p><p><p>Content->method = empty_run;</p></p><p><p>content->cancel_point=null;</p></p><p><p></p></p><p><p>S_tftask *task = (s_tftask *) malloc (sizeof (s_tftask));</p></p><p><p>Task->task_list = content;</p></p><p><p>Task->thread_status = tfthread_idle;</p></p><p><p></p></p><p><p>S_tfthread_config config = {pthread_mutex_initializer,pthread_cond_initializer};</p></p><p><p>Task->config = config;</p></p><p><p></p></p><p><p>S_tfthread *thread = (s_tfthread *) malloc (sizeof (s_tfthread));</p></p><p><p></p></p><p><p>Thread->tftask = task;</p></p><p><p></p></p><p><p>Thread->name = k_tfthread_names[i];</p></p><p><p></p></p><p><p>k_threads[i]=thread;</p></p><p><p></p></p><p><p>ret = pthread_create (&posix_t_id, &attr, tfthreadpool_task_run,task);</p></p><p><p></p></p>2. After the loop is created, there will be n suspended threads in the program, and when a new task needs to be executed, the lookup will query out the idle thread in k_threads based on the different task flags and create a new s_tftask_content join S_ Tfthread the task list to resume the task by waking the thread through Pthread_cond_signal.<p><p>high-performance iOS programming path-pthread-based thread pool</p></p></span>