/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "fspr.h"
#include "fspr_portable.h"
#include "fspr_strings.h"
#include "fspr_arch_threadproc.h"

static int thread_count = 0;

fspr_status_t fspr_threadattr_create(fspr_threadattr_t **new,
                                                fspr_pool_t *pool)
{
    (*new) = (fspr_threadattr_t *)fspr_palloc(pool, 
              sizeof(fspr_threadattr_t));

    if ((*new) == NULL) {
        return APR_ENOMEM;
    }

    (*new)->pool = pool;
    (*new)->stack_size = APR_DEFAULT_STACK_SIZE;
    (*new)->detach = 0;
    (*new)->thread_name = NULL;
    return APR_SUCCESS;
}

fspr_status_t fspr_threadattr_detach_set(fspr_threadattr_t *attr,fspr_int32_t on)
{
    attr->detach = on;
	return APR_SUCCESS;   
}

fspr_status_t fspr_threadattr_detach_get(fspr_threadattr_t *attr)
{
    if (attr->detach == 1)
        return APR_DETACH;
    return APR_NOTDETACH;
}

APR_DECLARE(fspr_status_t) fspr_threadattr_stacksize_set(fspr_threadattr_t *attr,
                                                       fspr_size_t stacksize)
{
    attr->stack_size = stacksize;
    return APR_SUCCESS;
}

APR_DECLARE(fspr_status_t) fspr_threadattr_guardsize_set(fspr_threadattr_t *attr,
                                                       fspr_size_t size)
{
    return APR_ENOTIMPL;
}

static void *dummy_worker(void *opaque)
{
    fspr_thread_t *thd = (fspr_thread_t *)opaque;
    return thd->func(thd, thd->data);
}

fspr_status_t fspr_thread_create(fspr_thread_t **new,
 											fspr_threadattr_t *attr, 
                             				fspr_thread_start_t func,
 											void *data,
 											fspr_pool_t *pool)
{
    fspr_status_t stat;
    long flags = NX_THR_BIND_CONTEXT;
  	char threadName[NX_MAX_OBJECT_NAME_LEN+1];
    size_t stack_size = APR_DEFAULT_STACK_SIZE;

    if (attr && attr->thread_name) {
        strncpy (threadName, attr->thread_name, NX_MAX_OBJECT_NAME_LEN);
    }
    else {
	    sprintf(threadName, "APR_thread %04ld", ++thread_count);
    }

    /* An original stack size of 0 will allow NXCreateThread() to
    *   assign a default system stack size.  An original stack
    *   size of less than 0 will assign the APR default stack size.
    *   anything else will be taken as is.
    */
    if (attr && (attr->stack_size >= 0)) {
        stack_size = attr->stack_size;
    }
    
    (*new) = (fspr_thread_t *)fspr_palloc(pool, sizeof(fspr_thread_t));

    if ((*new) == NULL) {
        return APR_ENOMEM;
    }
    
    (*new)->pool = pool;
    (*new)->data = data;
    (*new)->func = func;
    (*new)->thread_name = (char*)fspr_pstrdup(pool, threadName);
    
    stat = fspr_pool_create(&(*new)->pool, pool);
    if (stat != APR_SUCCESS) {
        return stat;
    }
    
    if (attr && attr->detach) {
        flags |= NX_THR_DETACHED;
    }
    
    (*new)->ctx = NXContextAlloc(
    	/* void(*start_routine)(void *arg)*/(void (*)(void *)) dummy_worker,
     	/* void *arg */										   (*new),
     	/* int priority */ 									   NX_PRIO_MED,
     	/* NXSize_t stackSize */							   stack_size,
     	/* long flags */									   NX_CTX_NORMAL,
     	/* int *error */									   &stat);
		
     	                                                                   
  	stat = NXContextSetName(
		 	/* NXContext_t ctx */			(*new)->ctx,
			/* const char *name */			threadName);

  	stat = NXThreadCreate(
        	/* NXContext_t context */		(*new)->ctx,
        	/* long flags */				flags,
        	/* NXThreadId_t *thread_id */	&(*new)->td);

    if(stat==0)
     	return APR_SUCCESS;
        
	return(stat);// if error    
}

fspr_os_thread_t fspr_os_thread_current()
{
    return NXThreadGetId();
}

int fspr_os_thread_equal(fspr_os_thread_t tid1, fspr_os_thread_t tid2)
{
    return (tid1 == tid2);
}

void fspr_thread_yield()
{
    NXThreadYield();
}

fspr_status_t fspr_thread_exit(fspr_thread_t *thd,
                             fspr_status_t retval)
{
    thd->exitval = retval;
    fspr_pool_destroy(thd->pool);
    NXThreadExit(NULL);
    return APR_SUCCESS;
}

fspr_status_t fspr_thread_join(fspr_status_t *retval,
                                          fspr_thread_t *thd)
{
    fspr_status_t  stat;    
    NXThreadId_t dthr;

    if ((stat = NXThreadJoin(thd->td, &dthr, NULL)) == 0) {
        *retval = thd->exitval;
        return APR_SUCCESS;
    }
    else {
        return stat;
    }
}

fspr_status_t fspr_thread_detach(fspr_thread_t *thd)
{
    return APR_SUCCESS;
}

fspr_status_t fspr_thread_data_get(void **data, const char *key,
                                             fspr_thread_t *thread)
{
    if (thread != NULL) {
            return fspr_pool_userdata_get(data, key, thread->pool);
    }
    else {
        data = NULL;
        return APR_ENOTHREAD;
    }
}

fspr_status_t fspr_thread_data_set(void *data, const char *key,
                              fspr_status_t (*cleanup) (void *),
                              fspr_thread_t *thread)
{
    if (thread != NULL) {
       return fspr_pool_userdata_set(data, key, cleanup, thread->pool);
    }
    else {
        data = NULL;
        return APR_ENOTHREAD;
    }
}

APR_DECLARE(fspr_status_t) fspr_os_thread_get(fspr_os_thread_t **thethd,
                                            fspr_thread_t *thd)
{
    if (thd == NULL) {
        return APR_ENOTHREAD;
    }
    *thethd = &(thd->td);
    return APR_SUCCESS;
}

APR_DECLARE(fspr_status_t) fspr_os_thread_put(fspr_thread_t **thd,
                                            fspr_os_thread_t *thethd,
                                            fspr_pool_t *pool)
{
    if (pool == NULL) {
        return APR_ENOPOOL;
    }
    if ((*thd) == NULL) {
        (*thd) = (fspr_thread_t *)fspr_palloc(pool, sizeof(fspr_thread_t));
        (*thd)->pool = pool;
    }
    (*thd)->td = *thethd;
    return APR_SUCCESS;
}

APR_DECLARE(fspr_status_t) fspr_thread_once_init(fspr_thread_once_t **control,
                                               fspr_pool_t *p)
{
    (*control) = fspr_pcalloc(p, sizeof(**control));
    return APR_SUCCESS;
}

APR_DECLARE(fspr_status_t) fspr_thread_once(fspr_thread_once_t *control,
                                          void (*func)(void))
{
    if (!atomic_xchg(&control->value, 1)) {
        func();
    }
    return APR_SUCCESS;
}

APR_POOL_IMPLEMENT_ACCESSOR(thread)