mirror of
https://github.com/lxsang/ant-http
synced 2024-12-26 16:58:22 +01:00
fix scheduler bug
This commit is contained in:
Xuan Sang LE
parent
d50b1352f6
commit
cbd574cbc0
181
libs/scheduler.c
181
libs/scheduler.c
@ -4,18 +4,15 @@
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private data & methods
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*/
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static antd_scheduler_t scheduler;
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static void enqueue(antd_task_t* task)
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static void enqueue(antd_task_queue_t* q, antd_task_t* task)
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{
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// check if task is exist
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int prio = task->priority>N_PRIORITY-1?N_PRIORITY-1:task->priority;
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antd_task_queue_t q = scheduler.task_queue[prio];
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antd_task_item_t it = q;
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antd_task_item_t it = *q;
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while(it && it->task->id != task->id && it->next != NULL)
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it = it->next;
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if(it && it->task->id == task->id)
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{
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LOG("Task %d exists, ignore it\n", task->id);
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//assert(it->task->id == task->id );
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return;
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}
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antd_task_item_t taski = (antd_task_item_t)malloc(sizeof *taski);
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@ -23,7 +20,7 @@ static void enqueue(antd_task_t* task)
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taski->next = NULL;
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if(!it) // first task
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{
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scheduler.task_queue[prio] = taski;
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*q = taski;
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}
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else
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{
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@ -33,26 +30,35 @@ static void enqueue(antd_task_t* task)
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static int working()
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{
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return scheduler.status;
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int stat;
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pthread_mutex_lock(&scheduler.scheduler_lock);
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stat = scheduler.status;
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pthread_mutex_unlock(&scheduler.scheduler_lock);
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return stat;
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}
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static void stop()
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{
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pthread_mutex_lock(&scheduler.server_lock);
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pthread_mutex_lock(&scheduler.scheduler_lock);
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scheduler.status = 0;
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pthread_mutex_unlock(&scheduler.server_lock);
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pthread_mutex_unlock(&scheduler.scheduler_lock);
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for (int i = 0; i < scheduler.n_workers; i++)
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pthread_join(scheduler.workers[i].pid, NULL);
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if(scheduler.workers) free(scheduler.workers);
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// destroy all the mutex
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pthread_mutex_destroy(&scheduler.scheduler_lock);
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pthread_mutex_destroy(&scheduler.task_lock);
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pthread_mutex_destroy(&scheduler.queue_lock);
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pthread_mutex_destroy(&scheduler.worker_lock);
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}
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static antd_task_item_t dequeue(int priority)
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static antd_task_item_t dequeue(antd_task_queue_t* q)
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{
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int prio = priority>N_PRIORITY-1?N_PRIORITY-1:priority;
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antd_task_item_t it = scheduler.task_queue[prio];
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antd_task_item_t it = *q;
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if(it)
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{
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scheduler.task_queue[prio] = it->next;
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*q = it->next;
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it->next = NULL;
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}
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return it;
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}
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@ -60,26 +66,13 @@ static antd_task_item_t dequeue(int priority)
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static antd_task_item_t next_task()
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{
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antd_task_item_t it = NULL;
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pthread_mutex_lock(&scheduler.server_lock);
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for(int i = 0; i< N_PRIORITY; i++)
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{
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it = dequeue(i);
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if(it) break;
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}
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pthread_mutex_unlock(&scheduler.server_lock);
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pthread_mutex_lock(&scheduler.queue_lock);
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it = dequeue(&scheduler.workers_queue);
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pthread_mutex_unlock(&scheduler.queue_lock);
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return it;
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}
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static int available_workers()
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{
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int n = 0;
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pthread_mutex_lock(&scheduler.server_lock);
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for(int i=0; i < scheduler.n_workers; i++)
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if(scheduler.workers[i].status == 0) n++;
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pthread_mutex_unlock(&scheduler.server_lock);
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return n;
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}
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static antd_callback_t* callback_of( void* (*callback)(void*) )
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{
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antd_callback_t* cb = NULL;
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@ -138,28 +131,48 @@ static void work(void* data)
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}
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}
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static void destroy_queue(antd_task_queue_t q)
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{
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antd_task_item_t it, curr;
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it = q;
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while(it)
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{
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// first free the task
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if(it->task && it->task->callback) free_callback(it->task->callback);
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if(it->task) free(it->task);
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// then free the placeholder
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curr = it;
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it = it->next;
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free(curr);
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}
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}
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/*
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Main API methods
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init the main scheduler
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*/
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int antd_available_workers()
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{
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int n = 0;
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pthread_mutex_lock(&scheduler.worker_lock);
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for(int i=0; i < scheduler.n_workers; i++)
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if(scheduler.workers[i].status == 0) n++;
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pthread_mutex_unlock(&scheduler.worker_lock);
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return n;
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}
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/*
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* assign task to a worker
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*/
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void antd_attach_task(antd_worker_t* worker)
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{
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antd_task_item_t it;
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pthread_mutex_lock(&scheduler.server_lock);
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worker->status = 0;
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pthread_mutex_unlock(&scheduler.server_lock);
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// fetch the next in queue
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pthread_mutex_lock(&scheduler.worker_lock);
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it = next_task();
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if(!it) return;
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//LOG("worker processing \n");
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pthread_mutex_lock(&scheduler.server_lock);
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worker->status = 0;
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if(it)
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worker->status = 1;
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pthread_mutex_unlock(&scheduler.server_lock);
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pthread_mutex_unlock(&scheduler.worker_lock);
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// execute the task
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//LOG("task executed by worker %d\n", worker->pid);
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antd_execute_task(it);
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}
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@ -169,6 +182,12 @@ void antd_scheduler_init(int n)
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srand((unsigned) time(&t));
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scheduler.n_workers = n;
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scheduler.status = 1;
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scheduler.workers_queue = NULL;
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// init lock
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pthread_mutex_init(&scheduler.scheduler_lock,NULL);
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pthread_mutex_init(&scheduler.task_lock,NULL);
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pthread_mutex_init(&scheduler.worker_lock,NULL);
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pthread_mutex_init(&scheduler.queue_lock,NULL);
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for(int i = 0; i < N_PRIORITY; i++) scheduler.task_queue[i] = NULL;
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// create scheduler.workers
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if(n > 0)
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@ -201,26 +220,17 @@ void antd_task_unlock()
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}
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/*
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destroy all pending task
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pthread_mutex_lock(&scheduler.queue_lock);
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*/
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void antd_scheduler_destroy()
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{
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// free all the chains
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antd_task_item_t it, curr;
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stop();
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for(int i=0; i < N_PRIORITY; i++)
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{
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it = scheduler.task_queue[i];
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while(it)
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{
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// first free the task
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if(it->task && it->task->callback) free_callback(it->task->callback);
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if(it->task) free(it->task);
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// then free the placeholder
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curr = it;
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it = it->next;
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free(curr);
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}
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destroy_queue(scheduler.task_queue[i]);
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}
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destroy_queue(scheduler.workers_queue);
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}
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/*
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@ -235,6 +245,7 @@ antd_task_t* antd_create_task(void* (*handle)(void*), void *data, void* (*callba
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task->handle = handle;
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task->callback = callback_of(callback);
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task->priority = NORMAL_PRIORITY;
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task->type = LIGHT;
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return task;
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}
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@ -243,14 +254,17 @@ antd_task_t* antd_create_task(void* (*handle)(void*), void *data, void* (*callba
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*/
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void antd_add_task(antd_task_t* task)
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{
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pthread_mutex_lock(&scheduler.server_lock);
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enqueue(task);
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pthread_mutex_unlock(&scheduler.server_lock);
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// check if task is exist
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int prio = task->priority>N_PRIORITY-1?N_PRIORITY-1:task->priority;
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pthread_mutex_lock(&scheduler.scheduler_lock);
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enqueue(&scheduler.task_queue[prio], task);
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pthread_mutex_unlock(&scheduler.scheduler_lock);
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}
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void antd_execute_task(antd_task_item_t taski)
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{
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if(!taski) return;
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// execute the task
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void *ret = (*(taski->task->handle))(taski->task->data);
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// check the return data if it is a new task
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@ -289,22 +303,69 @@ void antd_execute_task(antd_task_item_t taski)
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}
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}
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}
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int antd_scheduler_busy()
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int antd_has_pending_task()
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{
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int ret = 0;
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if(available_workers() != scheduler.n_workers) return 1;
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pthread_mutex_lock(&scheduler.server_lock);
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pthread_mutex_lock(&scheduler.scheduler_lock);
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for(int i = 0; i < N_PRIORITY; i++)
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if(scheduler.task_queue[i] != NULL)
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{
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ret = 1;
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break;
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}
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pthread_mutex_unlock(&scheduler.server_lock);
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pthread_mutex_unlock(&scheduler.scheduler_lock);
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if(!ret)
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{
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pthread_mutex_lock(&scheduler.queue_lock);
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ret = (scheduler.workers_queue != NULL);
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pthread_mutex_unlock(&scheduler.queue_lock);
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}
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return ret;
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}
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int antd_scheduler_busy()
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{
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if(antd_available_workers() != scheduler.n_workers) return 1;
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//return 0;
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return antd_has_pending_task();
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}
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int antd_scheduler_status()
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{
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return scheduler.status;
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}
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void antd_task_schedule()
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{
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// fetch next task from the task_queue
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antd_task_item_t it = NULL;
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pthread_mutex_lock(&scheduler.scheduler_lock);
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for(int i = 0; i< N_PRIORITY; i++)
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{
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it = dequeue(&scheduler.task_queue[i]);
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if(it)
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break;
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}
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pthread_mutex_unlock(&scheduler.scheduler_lock);
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if(!it)
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{
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return;
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}
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// has the task now
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// check the type of tas
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if(it->task->type == LIGHT || scheduler.n_workers <= 0)
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{
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// do it by myself
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antd_execute_task(it);
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}
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else
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{
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// delegate to other workers by
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//pushing to the worker queue
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LOG("delegate to workers\n");
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pthread_mutex_lock(&scheduler.queue_lock);
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enqueue(&scheduler.workers_queue, it->task);
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free(it);
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pthread_mutex_unlock(&scheduler.queue_lock);
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}
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}
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@ -9,6 +9,7 @@
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#define LOW_PRIORITY (N_PRIORITY - 1)
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#define HIGH_PRIORITY 0
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typedef enum { LIGHT, HEAVY } antd_task_type_t;
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// callback definition
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typedef struct __callback_t{
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void* (*handle)(void*);
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@ -38,7 +39,13 @@ typedef struct {
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user data if any
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*/
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void * data;
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/*
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type of a task
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light task is executed directly by
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the leader
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heavy tasks is delegated to workers
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*/
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antd_task_type_t type;
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} antd_task_t;
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typedef struct {
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@ -55,9 +62,12 @@ typedef struct __task_item_t{
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typedef antd_task_item_t antd_task_queue_t;
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typedef struct {
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pthread_mutex_t server_lock;
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pthread_mutex_t queue_lock;
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pthread_mutex_t scheduler_lock;
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pthread_mutex_t worker_lock;
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pthread_mutex_t task_lock;
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antd_task_queue_t task_queue[N_PRIORITY];
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antd_task_queue_t workers_queue;
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uint8_t status; // 0 stop, 1 working
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antd_worker_t* workers;
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int n_workers;
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@ -95,4 +105,7 @@ void antd_execute_task(antd_task_item_t);
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int antd_scheduler_busy();
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void antd_attach_task(antd_worker_t* worker);
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void antd_task_schedule();
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int antd_available_workers();
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int antd_has_pending_task();
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#endif
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12
relay.c
12
relay.c
@ -90,8 +90,6 @@ int main(int argc, char* argv[])
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timeout.tv_usec = 500;
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// 0 worker
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antd_scheduler_init(0);
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antd_worker_t worker;
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worker.status = 0;
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// set server socket to non blocking
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fcntl(server_sock, F_SETFL, O_NONBLOCK); /* Change the socket into non-blocking state */
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LOG("relayd running on port %d\n", port);
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@ -99,7 +97,7 @@ int main(int argc, char* argv[])
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while (antd_scheduler_status())
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{
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// execute task
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antd_attach_task(&worker);
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antd_task_schedule();
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client_sock = accept(server_sock,(struct sockaddr *)&client_name,&client_name_len);
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if (client_sock == -1)
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{
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@ -108,11 +106,11 @@ int main(int argc, char* argv[])
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antd_client_t* client = (antd_client_t*)malloc(sizeof(antd_client_t));
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// set timeout to socket
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if (setsockopt (client_sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout,sizeof(timeout)) < 0)
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perror("setsockopt failed\n");
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//if (setsockopt (client_sock, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout,sizeof(timeout)) < 0)
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// perror("setsockopt failed\n");
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if (setsockopt (client_sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout,sizeof(timeout)) < 0)
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perror("setsockopt failed\n");
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//if (setsockopt (client_sock, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout,sizeof(timeout)) < 0)
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// perror("setsockopt failed\n");
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/*
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get the remote IP
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