qlg.tsgz.moe/vendor/swoole/swoole_coroutine_util.c

/*
  +----------------------------------------------------------------------+
  | Swoole                                                               |
  +----------------------------------------------------------------------+
  | This source file is subject to version 2.0 of the Apache license,    |
  | that is bundled with this package in the file LICENSE, and is        |
  | available through the world-wide-web at the following url:           |
  | http://www.apache.org/licenses/LICENSE-2.0.html                      |
  | If you did not receive a copy of the Apache2.0 license and are unable|
  | to obtain it through the world-wide-web, please send a note to       |
  | license@swoole.com so we can mail you a copy immediately.            |
  +----------------------------------------------------------------------+
  | Author: Xinyu Zhu  <xyzhu1120@gmail.com>                             |
  |         shiguangqi <shiguangqi2008@gmail.com>                        |
  |         Tianfeng Han  <mikan.tenny@gmail.com>                        |
  +----------------------------------------------------------------------+
 */
#include "php_swoole.h"

#ifdef SW_COROUTINE
#include "swoole_coroutine.h"
#include "async.h"
#include "ext/standard/file.h"

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_void, 0, 0, 0)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_set, 0, 0, 1)
    ZEND_ARG_INFO(0, options)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_create, 0, 0, 1)
    ZEND_ARG_INFO(0, func)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_exec, 0, 0, 1)
    ZEND_ARG_INFO(0, command)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_resume, 0, 0, 1)
    ZEND_ARG_INFO(0, uid)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_sleep, 0, 0, 1)
    ZEND_ARG_INFO(0, seconds)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_fread, 0, 0, 1)
    ZEND_ARG_INFO(0, handle)
    ZEND_ARG_INFO(0, length)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_fgets, 0, 0, 1)
    ZEND_ARG_INFO(0, handle)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_fwrite, 0, 0, 2)
    ZEND_ARG_INFO(0, handle)
    ZEND_ARG_INFO(0, string)
    ZEND_ARG_INFO(0, length)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_gethostbyname, 0, 0, 1)
    ZEND_ARG_INFO(0, domain_name)
    ZEND_ARG_INFO(0, family)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_getaddrinfo, 0, 0, 1)
    ZEND_ARG_INFO(0, hostname)
    ZEND_ARG_INFO(0, family)
    ZEND_ARG_INFO(0, socktype)
    ZEND_ARG_INFO(0, protocol)
    ZEND_ARG_INFO(0, service)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_readFile, 0, 0, 1)
    ZEND_ARG_INFO(0, filename)
ZEND_END_ARG_INFO()

ZEND_BEGIN_ARG_INFO_EX(arginfo_swoole_coroutine_writeFile, 0, 0, 2)
    ZEND_ARG_INFO(0, filename)
    ZEND_ARG_INFO(0, data)
    ZEND_ARG_INFO(0, flags)
ZEND_END_ARG_INFO()

static PHP_METHOD(swoole_coroutine_util, set);
static PHP_METHOD(swoole_coroutine_util, suspend);
static PHP_METHOD(swoole_coroutine_util, resume);
static PHP_METHOD(swoole_coroutine_util, stats);
static PHP_METHOD(swoole_coroutine_util, getuid);
static PHP_METHOD(swoole_coroutine_util, sleep);
static PHP_METHOD(swoole_coroutine_util, fread);
static PHP_METHOD(swoole_coroutine_util, fgets);
static PHP_METHOD(swoole_coroutine_util, fwrite);
static PHP_METHOD(swoole_coroutine_util, gethostbyname);
static PHP_METHOD(swoole_coroutine_util, getaddrinfo);
static PHP_METHOD(swoole_coroutine_util, readFile);
static PHP_METHOD(swoole_coroutine_util, writeFile);

static swHashMap *defer_coros;

static zend_class_entry swoole_coroutine_util_ce;
static zend_class_entry *swoole_coroutine_util_class_entry_ptr;

static const zend_function_entry swoole_coroutine_util_methods[] =
{
    ZEND_FENTRY(create, ZEND_FN(swoole_coroutine_create), arginfo_swoole_coroutine_create, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    ZEND_FENTRY(exec, ZEND_FN(swoole_coroutine_exec), arginfo_swoole_coroutine_exec, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, set, arginfo_swoole_coroutine_set, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, suspend, arginfo_swoole_coroutine_void, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, resume, arginfo_swoole_coroutine_resume, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, stats, arginfo_swoole_coroutine_void, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, getuid, arginfo_swoole_coroutine_void, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, sleep, arginfo_swoole_coroutine_sleep, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, fread, arginfo_swoole_coroutine_fread, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, fgets, arginfo_swoole_coroutine_fgets, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, fwrite, arginfo_swoole_coroutine_fwrite, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, readFile, arginfo_swoole_coroutine_readFile, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, writeFile, arginfo_swoole_coroutine_writeFile, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, gethostbyname, arginfo_swoole_coroutine_gethostbyname, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_ME(swoole_coroutine_util, getaddrinfo, arginfo_swoole_coroutine_getaddrinfo, ZEND_ACC_PUBLIC | ZEND_ACC_STATIC)
    PHP_FE_END
};

void swoole_coroutine_util_init(int module_number TSRMLS_DC)
{
    SWOOLE_INIT_CLASS_ENTRY(swoole_coroutine_util_ce, "swoole_coroutine", "Swoole\\Coroutine", swoole_coroutine_util_methods);
    swoole_coroutine_util_class_entry_ptr = zend_register_internal_class(&swoole_coroutine_util_ce TSRMLS_CC);

    if (SWOOLE_G(use_namespace))
    {
        sw_zend_register_class_alias("swoole_coroutine", swoole_coroutine_util_class_entry_ptr);
    }
    else
    {
        sw_zend_register_class_alias("Swoole\\Coroutine", swoole_coroutine_util_class_entry_ptr);
    }

    if (SWOOLE_G(use_shortname))
    {
        sw_zend_register_class_alias("Co", swoole_coroutine_util_class_entry_ptr);
    }
    defer_coros = swHashMap_new(SW_HASHMAP_INIT_BUCKET_N, NULL);
}

/*
 * suspend current coroutine
 */
static PHP_METHOD(swoole_coroutine_util, suspend)
{
    int cid = sw_get_current_cid();
    if (cid < 0)
    {
        swoole_php_fatal_error(E_ERROR, "can not suspend outside coroutine");
        RETURN_FALSE;
    }

    swLinkedList *coros_list = swHashMap_find_int(defer_coros, cid);
    if (coros_list == NULL)
    {
        coros_list = swLinkedList_new(2, NULL);
        if (coros_list == NULL)
        {
            RETURN_FALSE;
        }
        if (swHashMap_add_int(defer_coros, cid, coros_list) == SW_ERR)
        {
            swLinkedList_free(coros_list);
            RETURN_FALSE;
        }
    }

    php_context *context = emalloc(sizeof(php_context));
    coro_save(context);
    if (swLinkedList_append(coros_list, (void *) context) == SW_ERR)
    {
        efree(context);
        RETURN_FALSE;
    }
    coro_yield();
}

static PHP_METHOD(swoole_coroutine_util, set)
{
    zval *zset = NULL;
    HashTable *vht = NULL;
    zval *v;

    if (zend_parse_parameters(ZEND_NUM_ARGS()TSRMLS_CC, "z", &zset) == FAILURE)
    {
        return;
    }

    php_swoole_array_separate(zset);
    vht = Z_ARRVAL_P(zset);
    if (php_swoole_array_get_value(vht, "max_coroutine", v))
    {
        convert_to_long(v);
        COROG.max_coro_num = (int) Z_LVAL_P(v);
        if (COROG.max_coro_num <= 0)
        {
            COROG.max_coro_num = DEFAULT_MAX_CORO_NUM;
        }
        else if (COROG.max_coro_num >= MAX_CORO_NUM_LIMIT)
        {
            COROG.max_coro_num = MAX_CORO_NUM_LIMIT;
        }
    }
    if (php_swoole_array_get_value(vht, "stack_size", v))
    {
        convert_to_long(v);
        COROG.stack_size = (uint32_t) Z_LVAL_P(v);
    }
    if (php_swoole_array_get_value(vht, "log_level", v))
    {
        convert_to_long(v);
        SwooleG.log_level = (int32_t) Z_LVAL_P(v);
    }
    if (php_swoole_array_get_value(vht, "trace_flags", v))
    {
        convert_to_long(v);
        SwooleG.trace_flags = (int32_t) Z_LVAL_P(v);
    }
    sw_zval_ptr_dtor(&zset);
}

PHP_FUNCTION(swoole_coroutine_create)
{
    zval *callback;
    if (zend_parse_parameters(ZEND_NUM_ARGS()TSRMLS_CC, "z", &callback) == FAILURE)
    {
        return;
    }
    if (unlikely(SWOOLE_G(req_status) == PHP_SWOOLE_CALL_USER_SHUTDOWNFUNC_BEGIN))
    {
        zend_function *func = (zend_function *) EG(current_execute_data)->prev_execute_data->func;
        zend_string *destruct = zend_string_init("__destruct", strlen("__destruct"), 0);
        if (zend_string_equals(func->common.function_name, destruct))
        {
            zend_string_release(destruct);
            swoole_php_fatal_error(E_ERROR, "can not use coroutine in __destruct after php_request_shutdown");
            return;
        }
        zend_string_release(destruct);
    }
    char *func_name = NULL;
    zend_fcall_info_cache *func_cache = emalloc(sizeof(zend_fcall_info_cache));
    if (!sw_zend_is_callable_ex(callback, NULL, 0, &func_name, NULL, func_cache, NULL TSRMLS_CC))
    {
        swoole_php_fatal_error(E_ERROR, "Function '%s' is not callable", func_name);
        efree(func_name);
        return;
    }
    efree(func_name);
    if (COROG.active == 0)
    {
        coro_init(TSRMLS_C);
    }
    php_swoole_check_reactor();
    callback = sw_zval_dup(callback);
    sw_zval_add_ref(&callback);

    zval *retval = NULL;
    zval *args[1];
    int cid = coro_create(func_cache, args, 0, &retval, NULL, NULL);
    sw_zval_free(callback);
    efree(func_cache);
    if (EG(exception))
    {
        zend_exception_error(EG(exception), E_ERROR TSRMLS_CC);
    }
    if (retval != NULL)
    {
        sw_zval_ptr_dtor(&retval);
    }
    if (cid < 0)
    {
        RETURN_FALSE;
    }
    else
    {
        RETURN_LONG(cid);
    }
}

static PHP_METHOD(swoole_coroutine_util, resume)
{
    long id;
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &id) == FAILURE)
    {
        return;
    }

    swLinkedList *coros_list = swHashMap_find_int(defer_coros, id);
    if (coros_list == NULL)
    {
        swoole_php_fatal_error(E_WARNING, "Nothing can coroResume.");
        RETURN_FALSE;
    }

    php_context *context = swLinkedList_shift(coros_list);
    if (context == NULL)
    {
        swoole_php_fatal_error(E_WARNING, "Nothing can coroResume.");
        RETURN_FALSE;
    }

    zval *retval = NULL;
    zval *result;
    SW_MAKE_STD_ZVAL(result);
    ZVAL_BOOL(result, 1);
    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(context);
    RETURN_TRUE;
}

static PHP_METHOD(swoole_coroutine_util, stats)
{
    array_init(return_value);
    sw_add_assoc_long_ex(return_value, ZEND_STRS("coroutine_num"), COROG.coro_num);
}

static PHP_METHOD(swoole_coroutine_util, getuid)
{
    RETURN_LONG(sw_get_current_cid());
}

static void php_coroutine_sleep_timeout(swTimer *timer, swTimer_node *tnode)
{
    zval *retval = NULL;
    zval *result = NULL;
    SW_MAKE_STD_ZVAL(result);
    ZVAL_BOOL(result, 1);

    php_context *context = (php_context *) tnode->data;
    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(context);
}

int php_coroutine_reactor_can_exit(swReactor *reactor)
{
    return COROG.coro_num != 0;
}

static PHP_METHOD(swoole_coroutine_util, sleep)
{
    coro_check(TSRMLS_C);

    double seconds;
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "d", & seconds) == FAILURE)
    {
        return;
    }

    int ms = (int) (seconds * 1000);

    if (SwooleG.serv && swIsMaster())
    {
        swoole_php_fatal_error(E_WARNING, "cannot use timer in master process.");
        return;
    }
    if (ms > SW_TIMER_MAX_VALUE)
    {
        swoole_php_fatal_error(E_WARNING, "The given parameters is too big.");
        return;
    }
    if (ms <= 0)
    {
        swoole_php_fatal_error(E_WARNING, "Timer must be greater than 0");
        return;
    }

    php_context *context = emalloc(sizeof(php_context));
    context->onTimeout = NULL;
    context->state = SW_CORO_CONTEXT_RUNNING;

    php_swoole_check_reactor();
    php_swoole_check_timer(ms);
    if (SwooleG.timer.add(&SwooleG.timer, ms, 0, context, php_coroutine_sleep_timeout) == NULL)
    {
        RETURN_FALSE;
    }

    coro_save(context);
    coro_yield();
}

static void aio_onReadCompleted(swAio_event *event)
{
    zval *retval = NULL;
    zval *result = NULL;
    SW_MAKE_STD_ZVAL(result);

    if (event->error == 0)
    {
        SW_ZVAL_STRINGL(result, event->buf, event->ret, 1);
    }
    else
    {
        ZVAL_BOOL(result, 0);
    }

    php_context *context = (php_context *) event->object;
    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(event->buf);
    efree(context);
}

static void aio_onStreamGetLineCompleted(swAio_event *event)
{
    zval *retval = NULL;
    zval *result = NULL;
    SW_MAKE_STD_ZVAL(result);

    if (event->error == 0)
    {
        SW_ZVAL_STRINGL(result, event->buf, event->ret, 1);
    }
    else
    {
        ZVAL_BOOL(result, 0);
    }

    php_context *context = (php_context *) event->object;
    php_stream *stream;
    php_stream_from_zval_no_verify(stream, &context->coro_params);
    stream->readpos = event->offset;
    stream->writepos = (long) event->req;
    if (event->flags & SW_AIO_EOF)
    {
        stream->eof = 1;
    }

    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(context);
}

static void aio_onWriteCompleted(swAio_event *event)
{
    zval *retval = NULL;
    zval *result = NULL;

    SW_MAKE_STD_ZVAL(result);
    if (event->ret < 0)
    {
        ZVAL_BOOL(result, 0);
    }
    else
    {
        ZVAL_LONG(result, event->ret);
    }

    php_context *context = (php_context *) event->object;
    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(event->buf);
    efree(context);
}

static void aio_onReadFileCompleted(swAio_event *event)
{
    zval *retval = NULL;
    zval *result = NULL;

    SW_MAKE_STD_ZVAL(result);
    if (event->ret < 0)
    {
        ZVAL_BOOL(result, 0);
    }
    else
    {
        ZVAL_STRINGL(result, event->buf, event->ret);
        sw_free(event->buf);
    }

    php_context *context = (php_context *) event->object;
    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(event->req);
    efree(context);
}

static void aio_onWriteFileCompleted(swAio_event *event)
{
    zval *retval = NULL;
    zval *result = NULL;

    SW_MAKE_STD_ZVAL(result);
    if (event->ret < 0)
    {
        ZVAL_BOOL(result, 0);
    }
    else
    {
        ZVAL_LONG(result, event->ret);
    }

    php_context *context = (php_context *) event->object;
    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(event->req);
    efree(context);
}

static PHP_METHOD(swoole_coroutine_util, fread)
{
    coro_check(TSRMLS_C);

    zval *handle;
    zend_long length = 0;

#ifdef FAST_ZPP
    ZEND_PARSE_PARAMETERS_START(1, 2)
        Z_PARAM_RESOURCE(handle)
        Z_PARAM_OPTIONAL
        Z_PARAM_LONG(length)
    ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
#else
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r|l", &handle, &length) == FAILURE)
    {
        return;
    }
#endif

    int fd = swoole_convert_to_fd(handle TSRMLS_CC);

    struct stat file_stat;
    if (fstat(fd, &file_stat) < 0)
    {
        RETURN_FALSE;
    }

    off_t _seek = lseek(fd, 0, SEEK_CUR);
    if (length <= 0 || file_stat.st_size - _seek < length)
    {
        length = file_stat.st_size - _seek;
    }

    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    ev.nbytes = length + 1;
    ev.buf = emalloc(ev.nbytes);
    if (!ev.buf)
    {
        RETURN_FALSE;
    }

    php_context *context = emalloc(sizeof(php_context));

    ((char *) ev.buf)[length] = 0;
    ev.flags = 0;
    ev.type = SW_AIO_READ;
    ev.object = context;
    ev.callback = aio_onReadCompleted;
    ev.fd = fd;
    ev.offset = _seek;

    if (!SwooleAIO.init)
    {
        php_swoole_check_reactor();
        swAio_init();
    }

    swTrace("fd=%d, offset=%ld, length=%ld", fd, ev.offset, ev.nbytes);

    int ret = swAio_dispatch(&ev);
    if (ret < 0)
    {
        efree(context);
        RETURN_FALSE;
    }

    context->onTimeout = NULL;
    context->state = SW_CORO_CONTEXT_RUNNING;

    coro_save(context);
    coro_yield();
}

static PHP_METHOD(swoole_coroutine_util, fgets)
{
    coro_check(TSRMLS_C);

    zval *handle;
    php_stream *stream;

#ifdef FAST_ZPP
    ZEND_PARSE_PARAMETERS_START(1, 2)
        Z_PARAM_RESOURCE(handle)
    ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
#else
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "r", &handle) == FAILURE)
    {
        return;
    }
#endif

    int fd = swoole_convert_to_fd(handle TSRMLS_CC);
    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    php_stream_from_res(stream, Z_RES_P(handle));

    if (stream->readbuf == NULL)
    {
        stream->readbuflen = stream->chunk_size;
        stream->readbuf = emalloc(stream->chunk_size);
    }

    ev.nbytes = stream->readbuflen;
    ev.buf = stream->readbuf;
    if (!ev.buf)
    {
        RETURN_FALSE;
    }

    php_context *context = emalloc(sizeof(php_context));

    ev.flags = 0;
    ev.type = SW_AIO_STREAM_GET_LINE;
    ev.object = context;
    ev.callback = aio_onStreamGetLineCompleted;
    ev.fd = fd;
    ev.offset = stream->readpos;
    ev.req = (void *) (long) stream->writepos;

    if (!SwooleAIO.init)
    {
        php_swoole_check_reactor();
        swAio_init();
    }

    swTrace("fd=%d, offset=%ld, length=%ld", fd, ev.offset, ev.nbytes);

    int ret = swAio_dispatch(&ev);
    if (ret < 0)
    {
        efree(context);
        RETURN_FALSE;
    }

    context->coro_params = *handle;
    context->onTimeout = NULL;
    context->state = SW_CORO_CONTEXT_RUNNING;

    coro_save(context);
    coro_yield();
}

static PHP_METHOD(swoole_coroutine_util, fwrite)
{
    coro_check(TSRMLS_C);

    zval *handle;
    char *str;
    zend_size_t l_str;
    zend_long length = 0;

#ifdef FAST_ZPP
    ZEND_PARSE_PARAMETERS_START(2, 3)
        Z_PARAM_RESOURCE(handle)
        Z_PARAM_STRING(str, l_str)
        Z_PARAM_OPTIONAL
        Z_PARAM_LONG(length)
    ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
#else
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "rs|l", &handle, &str, &l_str, &length) == FAILURE)
    {
        return;
    }
#endif

    int fd = swoole_convert_to_fd(handle TSRMLS_CC);

    off_t _seek = lseek(fd, 0, SEEK_CUR);
    if (length <= 0 || length > l_str)
    {
        length = l_str;
    }

    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    ev.nbytes = length;
    ev.buf = estrndup(str, length);

    if (!ev.buf)
    {
        RETURN_FALSE;
    }

    php_context *context = emalloc(sizeof(php_context));

    ev.flags = 0;
    ev.type = SW_AIO_WRITE;
    ev.object = context;
    ev.callback = aio_onWriteCompleted;
    ev.fd = fd;
    ev.offset = _seek;

    php_swoole_check_aio();

    swTrace("fd=%d, offset=%ld, length=%ld", fd, ev.offset, ev.nbytes);

    int ret = swAio_dispatch(&ev);
    if (ret < 0)
    {
        efree(context);
        RETURN_FALSE;
    }

    context->onTimeout = NULL;
    context->state = SW_CORO_CONTEXT_RUNNING;

    coro_save(context);
    coro_yield();
}

static PHP_METHOD(swoole_coroutine_util, readFile)
{
    coro_check(TSRMLS_C);

    char *filename = NULL;
    size_t l_filename = 0;

#ifdef FAST_ZPP
    ZEND_PARSE_PARAMETERS_START(1, 2)
        Z_PARAM_STRING(filename, l_filename)
    ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
#else
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &filename, &l_filename) == FAILURE)
    {
        return;
    }
#endif

    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    php_context *context = emalloc(sizeof(php_context));

    ev.type = SW_AIO_READ_FILE;
    ev.object = context;
    ev.callback = aio_onReadFileCompleted;
    ev.req = estrndup(filename, l_filename);

    if (!SwooleAIO.init)
    {
        php_swoole_check_reactor();
        swAio_init();
    }

    swTrace("readFile(%s)", filename);

    int ret = swAio_dispatch(&ev);
    if (ret < 0)
    {
        efree(context);
        RETURN_FALSE;
    }

    context->onTimeout = NULL;
    context->state = SW_CORO_CONTEXT_RUNNING;

    coro_save(context);
    coro_yield();
}

static PHP_METHOD(swoole_coroutine_util, writeFile)
{
    coro_check(TSRMLS_C);

    char *filename = NULL;
    size_t l_filename = 0;
    char *data = NULL;
    size_t l_data = 0;
    zend_long flags = 0;

#ifdef FAST_ZPP
    ZEND_PARSE_PARAMETERS_START(2, 3)
        Z_PARAM_STRING(filename, l_filename)
        Z_PARAM_STRING(data, l_data)
        Z_PARAM_OPTIONAL
        Z_PARAM_LONG(flags)
    ZEND_PARSE_PARAMETERS_END_EX(RETURN_FALSE);
#else
    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "ss|l", &filename, &l_filename, &data, &l_data, &flags) == FAILURE)
    {
        return;
    }
#endif

    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    ev.nbytes = l_data;
    ev.buf = data;

    php_context *context = emalloc(sizeof(php_context));

    ev.type = SW_AIO_WRITE_FILE;
    ev.object = context;
    ev.callback = aio_onWriteFileCompleted;
    ev.req = estrndup(filename, l_filename);
    ev.flags = O_CREAT | O_WRONLY;

    if (flags & PHP_FILE_APPEND)
    {
        ev.flags |= O_APPEND;
    }
    else
    {
        ev.flags |= O_TRUNC;
    }

    if (!SwooleAIO.init)
    {
        php_swoole_check_reactor();
        swAio_init();
    }

    swTrace("writeFile(%s, %ld)", filename, ev.nbytes);

    int ret = swAio_dispatch(&ev);
    if (ret < 0)
    {
        efree(context);
        RETURN_FALSE;
    }

    context->onTimeout = NULL;
    context->state = SW_CORO_CONTEXT_RUNNING;

    coro_save(context);
    coro_yield();
}

static void coro_dns_onResolveCompleted(swAio_event *event)
{
    php_context *context = event->object;

    zval *retval = NULL;
    zval *result = NULL;

    SW_MAKE_STD_ZVAL(result);

    if (event->error == 0)
    {
        SW_ZVAL_STRING(result, event->buf, 1);
    }
    else
    {
        SwooleG.error = event->error;
        ZVAL_BOOL(result, 0);
    }

    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(event->buf);
    efree(context);
}

static void coro_dns_onGetaddrinfoCompleted(swAio_event *event)
{
    php_context *context = event->object;

    zval *retval = NULL;
    zval *result = NULL;

    SW_MAKE_STD_ZVAL(result);

    struct sockaddr_in *addr_v4;
    struct sockaddr_in6 *addr_v6;

    swRequest_getaddrinfo *req = event->req;

    if (req->error == 0)
    {
        array_init(result);
        int i;
        char tmp[INET6_ADDRSTRLEN];
        const char *r ;

        for (i = 0; i < req->count; i++)
        {
            if (req->family == AF_INET)
            {
                addr_v4 = req->result + (i * sizeof(struct sockaddr_in));
                r = inet_ntop(AF_INET, (const void*) &addr_v4->sin_addr, tmp, sizeof(tmp));
            }
            else
            {
                addr_v6 = req->result + (i * sizeof(struct sockaddr_in6));
                r = inet_ntop(AF_INET6, (const void*) &addr_v6->sin6_addr, tmp, sizeof(tmp));
            }
            if (r)
            {
                add_next_index_string(result, tmp);
            }
        }
    }
    else
    {
        ZVAL_BOOL(result, 0);
        SwooleG.error = req->error;
    }

    int ret = coro_resume(context, result, &retval);
    if (ret == CORO_END && retval)
    {
        sw_zval_ptr_dtor(&retval);
    }
    sw_zval_ptr_dtor(&result);
    efree(req->hostname);
    efree(req->result);
    if (req->service)
    {
        efree(req->service);
    }
    efree(req);
    efree(context);
}

static PHP_METHOD(swoole_coroutine_util, gethostbyname)
{
    coro_check(TSRMLS_C);

    char *domain_name;
    zend_size_t l_domain_name;
    long family = AF_INET;

    if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s|l", &domain_name, &l_domain_name, &family) == FAILURE)
    {
        RETURN_FALSE;
    }

    if (l_domain_name <= 0)
    {
        swoole_php_fatal_error(E_WARNING, "domain name is empty.");
        RETURN_FALSE;
    }

    if (family != AF_INET && family != AF_INET6)
    {
        swoole_php_fatal_error(E_WARNING, "unknown protocol family, must be AF_INET or AF_INET6.");
        RETURN_FALSE;
    }

    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    if (l_domain_name < SW_IP_MAX_LENGTH)
    {
        ev.nbytes = SW_IP_MAX_LENGTH;
    }
    else
    {
        ev.nbytes = l_domain_name + 1;
    }

    ev.buf = emalloc(ev.nbytes);
    if (!ev.buf)
    {
        swWarn("malloc failed.");
        RETURN_FALSE;
    }

    php_context *sw_current_context = emalloc(sizeof(php_context));

    memcpy(ev.buf, domain_name, l_domain_name);
    ((char *) ev.buf)[l_domain_name] = 0;
    ev.flags = family;
    ev.type = SW_AIO_GETHOSTBYNAME;
    ev.object = sw_current_context;
    ev.callback = coro_dns_onResolveCompleted;

    php_swoole_check_aio();

    if (swAio_dispatch(&ev) < 0)
    {
        efree(ev.buf);
        RETURN_FALSE;
    }

    coro_save(sw_current_context);
    coro_yield();
}

static PHP_METHOD(swoole_coroutine_util, getaddrinfo)
{
    coro_check(TSRMLS_C);

    char *hostname;
    zend_size_t l_hostname;
    long family = AF_INET;
    long socktype = SOCK_STREAM;
    long protocol = IPPROTO_TCP;
    char *service = NULL;
    zend_size_t l_service = 0;

    if (zend_parse_parameters(ZEND_NUM_ARGS()TSRMLS_CC, "s|llls", &hostname, &l_hostname, &family, socktype, &protocol,
            &hostname, &l_hostname) == FAILURE)
    {
        RETURN_FALSE;
    }

    if (l_hostname <= 0)
    {
        swoole_php_fatal_error(E_WARNING, "hostname is empty.");
        RETURN_FALSE;
    }

    if (family != AF_INET && family != AF_INET6)
    {
        swoole_php_fatal_error(E_WARNING, "unknown protocol family, must be AF_INET or AF_INET6.");
        RETURN_FALSE;
    }

    swAio_event ev;
    bzero(&ev, sizeof(swAio_event));

    swRequest_getaddrinfo *req = emalloc(sizeof(swRequest_getaddrinfo));
    bzero(req, sizeof(swRequest_getaddrinfo));

    php_context *sw_current_context = emalloc(sizeof(php_context));

    ev.type = SW_AIO_GETADDRINFO;
    ev.object = sw_current_context;
    ev.callback = coro_dns_onGetaddrinfoCompleted;
    ev.req = req;

    req->hostname = estrndup(hostname, l_hostname);
    req->family = family;
    req->socktype = socktype;
    req->protocol = protocol;

    if (service)
    {
        req->service = estrndup(service, l_service);
    }

    if (family == AF_INET)
    {
        req->result = ecalloc(SW_DNS_HOST_BUFFER_SIZE, sizeof(struct sockaddr_in));
    }
    else
    {
        req->result = ecalloc(SW_DNS_HOST_BUFFER_SIZE, sizeof(struct sockaddr_in6));
    }

    php_swoole_check_aio();

    if (swAio_dispatch(&ev) < 0)
    {
        efree(ev.buf);
        RETURN_FALSE;
    }

    coro_save(sw_current_context);
    coro_yield();
}

#endif