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Constantine Sapuntzakis threaded resolver enhancements

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This commit is contained in:
Yang Tse 2010-01-25 23:50:13 +00:00
parent c054b8bfa7
commit 483ff1ca75
5 changed files with 290 additions and 437 deletions
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5
lib/hostares.c
View File

@ -350,7 +350,8 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
#ifdef ENABLE_IPV6 /* CURLRES_IPV6 */
struct in6_addr in6;
#endif /* CURLRES_IPV6 */
*waitp = FALSE;
*waitp = 0; /* default to synchronous response */
/* First check if this is an IPv4 address string */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0) {
@ -396,7 +397,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
ares_gethostbyname(data->state.areschannel, hostname, family,
(ares_host_callback)ares_query_completed_cb, conn);
*waitp = TRUE; /* please wait for the response */
*waitp = 1; /* expect asynchronous response */
}
return NULL; /* no struct yet */
}

9
lib/hostip.h
View File

@ -1,5 +1,5 @@
#ifndef __HOSTIP_H
#define __HOSTIP_H
#ifndef HEADER_CURL_HOSTIP_H
#define HEADER_CURL_HOSTIP_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
@ -165,6 +165,9 @@ int curl_dogetnameinfo(GETNAMEINFO_QUAL_ARG1 GETNAMEINFO_TYPE_ARG1 sa,
int line, const char *source);
#endif
/* IPv4 threadsafe resolve function used for synch and asynch builds */
Curl_addrinfo *Curl_ipv4_resolve_r(const char * hostname, int port);
/*
* Curl_addrinfo_callback() is used when we build with any asynch specialty.
* Handles end of async request processing. Inserts ai into hostcache when
@ -214,4 +217,4 @@ void Curl_destroy_thread_data(struct Curl_async *async);
extern sigjmp_buf curl_jmpenv;
#endif
#endif
#endif /* HEADER_CURL_HOSTIP_H */

66
lib/hostip4.c
View File

@ -5,7 +5,7 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 1998 - 2010, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
@ -87,8 +87,7 @@ bool Curl_ipvalid(struct SessionHandle *data)
return TRUE; /* OK, proceed */
}
#ifdef CURLRES_SYNCH /* the functions below are for synchronous resolves */
#ifdef CURLRES_SYNCH
/*
* Curl_getaddrinfo() - the ipv4 synchronous version.
*
@ -109,6 +108,33 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
int port,
int *waitp)
{
Curl_addrinfo *ai = NULL;
#ifdef CURL_DISABLE_VERBOSE_STRINGS
(void)conn;
#endif
*waitp = 0; /* synchronous response only */
ai = Curl_ipv4_resolve_r(hostname, port);
if(!ai)
infof(conn->data, "Curl_ipv4_resolve_r failed for %s\n", hostname);
return ai;
}
#endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV4 */
/*
* Curl_ipv4_resolve_r() - ipv4 threadsafe resolver function.
*
* This is used for both synchronous and asynchronous resolver builds,
* implying that only threadsafe code and function calls may be used.
*
*/
Curl_addrinfo *Curl_ipv4_resolve_r(const char *hostname,
int port)
{
#if defined(HAVE_GETHOSTBYNAME_R_3)
int res;
@ -118,17 +144,28 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
struct in_addr in;
struct hostent *buf = NULL;
#ifdef CURL_DISABLE_VERBOSE_STRINGS
(void)conn;
#endif
*waitp = 0; /* don't wait, we act synchronously */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */
return Curl_ip2addr(AF_INET, &in, hostname, port);
#if defined(HAVE_GETHOSTBYNAME_R)
#if defined(HAVE_GETADDRINFO_THREADSAFE)
else {
struct addrinfo hints;
char sbuf[NI_MAXSERV];
char *sbufptr = NULL;
int error;
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_INET;
hints.ai_socktype = SOCK_STREAM;
if (port) {
snprintf(sbuf, sizeof(sbuf), "%d", port);
sbufptr = sbuf;
}
hints.ai_flags = AI_CANONNAME;
error = Curl_getaddrinfo_ex(hostname, sbufptr, &hints, &ai);
#elif defined(HAVE_GETHOSTBYNAME_R)
/*
* gethostbyname_r() is the preferred resolve function for many platforms.
* Since there are three different versions of it, the following code is
@ -260,8 +297,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
}
else
#endif /* HAVE_GETHOSTBYNAME_R_3 */
{
infof(conn->data, "gethostbyname_r(2) failed for %s\n", hostname);
{
h = NULL; /* set return code to NULL */
free(buf);
}
@ -276,8 +312,6 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
#else
h = gethostbyname(hostname);
#endif
if(!h)
infof(conn->data, "gethostbyname(2) failed for %s\n", hostname);
#endif /*HAVE_GETHOSTBYNAME_R */
}
@ -290,7 +324,3 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
return ai;
}
#endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV4 */

6
lib/hostip6.c
View File

@ -126,7 +126,7 @@ bool Curl_ipvalid(struct SessionHandle *data)
return TRUE;
}
#if !defined(USE_THREADING_GETADDRINFO) && !defined(CURLRES_ARES)
#if defined(CURLRES_SYNCH)
#ifdef DEBUG_ADDRINFO
static void dump_addrinfo(struct connectdata *conn, const Curl_addrinfo *ai)
@ -170,7 +170,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
int pf;
struct SessionHandle *data = conn->data;
*waitp=0; /* don't wait, we have the response now */
*waitp = 0; /* synchronous response only */
/*
* Check if a limited name resolve has been requested.
@ -234,6 +234,6 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
return res;
}
#endif /* !USE_THREADING_GETADDRINFO && !CURLRES_ARES */
#endif /* CURLRES_SYNCH */
#endif /* CURLRES_IPV6 */

641
lib/hostthre.c
View File

@ -50,8 +50,14 @@
#include <stdlib.h>
#endif
#ifdef HAVE_PROCESS_H
#include <process.h>
#if defined(USE_THREADS_POSIX)
# ifdef HAVE_PTHREAD_H
# include <pthread.h>
# endif
#elif defined(USE_THREADS_WIN32)
# ifdef HAVE_PROCESS_H
# include <process.h>
# endif
#endif
#if (defined(NETWARE) && defined(__NOVELL_LIBC__))
@ -68,12 +74,12 @@
#include "url.h"
#include "multiif.h"
#include "inet_pton.h"
#include "inet_ntop.h"
#include "curl_threads.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
#include "inet_ntop.h"
#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"
@ -83,7 +89,7 @@
#endif
/***********************************************************************
* Only for Windows threaded name resolves builds
* Only for threaded name resolves builds
**********************************************************************/
#ifdef CURLRES_THREADED
@ -92,251 +98,162 @@ static bool init_resolve_thread(struct connectdata *conn,
const char *hostname, int port,
const struct addrinfo *hints);
#ifdef CURLRES_IPV4
#define THREAD_FUNC gethostbyname_thread
#define THREAD_NAME "gethostbyname_thread"
#else
#define THREAD_FUNC getaddrinfo_thread
#define THREAD_NAME "getaddrinfo_thread"
#endif
struct thread_data {
HANDLE thread_hnd;
unsigned thread_id;
DWORD thread_status;
curl_socket_t dummy_sock; /* dummy for Curl_resolv_fdset() */
HANDLE mutex_waiting; /* marks that we are still waiting for a resolve */
HANDLE event_resolved; /* marks that the thread obtained the information */
HANDLE event_thread_started; /* marks that the thread has initialized and
started */
HANDLE mutex_terminate; /* serializes access to flag_terminate */
HANDLE event_terminate; /* flag for thread to terminate instead of calling
callbacks */
#ifdef CURLRES_IPV6
/* Data for synchronization between resolver thread and its parent */
struct thread_sync_data {
curl_mutex_t * mtx;
int done;
char * hostname; /* hostname to resolve, Curl_async.hostname
duplicate */
int port;
int sock_error;
Curl_addrinfo *res;
#ifdef HAVE_GETADDRINFO
struct addrinfo hints;
#endif
};
/* Data for synchronization between resolver thread and its parent */
struct thread_sync_data {
HANDLE mutex_waiting; /* thread_data.mutex_waiting duplicate */
HANDLE mutex_terminate; /* thread_data.mutex_terminate duplicate */
HANDLE event_terminate; /* thread_data.event_terminate duplicate */
char * hostname; /* hostname to resolve, Curl_async.hostname
duplicate */
struct thread_data {
curl_thread_t thread_hnd;
curl_socket_t dummy_sock;
unsigned int poll_interval;
int interval_end;
struct thread_sync_data tsd;
};
static struct thread_sync_data * conn_thread_sync_data(struct connectdata *conn)
{
return &(((struct thread_data *)conn->async.os_specific)->tsd);
}
#define CONN_THREAD_SYNC_DATA(conn) &(((conn)->async.os_specific)->tsd);
/* Destroy resolver thread synchronization data */
static
void destroy_thread_sync_data(struct thread_sync_data * tsd)
{
if (tsd->mtx) {
Curl_mutex_destroy(tsd->mtx);
free(tsd->mtx);
}
if(tsd->hostname)
free(tsd->hostname);
if(tsd->event_terminate)
CloseHandle(tsd->event_terminate);
if(tsd->mutex_terminate)
CloseHandle(tsd->mutex_terminate);
if(tsd->mutex_waiting)
CloseHandle(tsd->mutex_waiting);
if (tsd->res)
Curl_freeaddrinfo(tsd->res);
memset(tsd,0,sizeof(*tsd));
}
/* Initialize resolver thread synchronization data */
static
BOOL init_thread_sync_data(struct thread_data * td,
int init_thread_sync_data(struct thread_sync_data * tsd,
const char * hostname,
struct thread_sync_data * tsd)
int port,
const struct addrinfo *hints)
{
HANDLE curr_proc = GetCurrentProcess();
memset(tsd, 0, sizeof(*tsd));
if(!DuplicateHandle(curr_proc, td->mutex_waiting,
curr_proc, &tsd->mutex_waiting, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
/* failed to duplicate the mutex, no point in continuing */
destroy_thread_sync_data(tsd);
return FALSE;
}
if(!DuplicateHandle(curr_proc, td->mutex_terminate,
curr_proc, &tsd->mutex_terminate, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
/* failed to duplicate the mutex, no point in continuing */
destroy_thread_sync_data(tsd);
return FALSE;
}
if(!DuplicateHandle(curr_proc, td->event_terminate,
curr_proc, &tsd->event_terminate, 0, FALSE,
DUPLICATE_SAME_ACCESS)) {
/* failed to duplicate the event, no point in continuing */
destroy_thread_sync_data(tsd);
return FALSE;
}
tsd->port = port;
#ifdef CURLRES_IPV6
DEBUGASSERT(hints);
tsd->hints = *hints;
#else
(void) hints;
#endif
tsd->mtx = malloc(sizeof(curl_mutex_t));
if (tsd->mtx == NULL) goto err_exit;
Curl_mutex_init(tsd->mtx);
tsd->sock_error = CURL_ASYNC_SUCCESS;
/* Copying hostname string because original can be destroyed by parent
* thread during gethostbyname execution.
*/
tsd->hostname = strdup(hostname);
if(!tsd->hostname) {
/* Memory allocation failed */
destroy_thread_sync_data(tsd);
return FALSE;
}
return TRUE;
if (!tsd->hostname) goto err_exit;
return 1;
err_exit:
/* Memory allocation failed */
destroy_thread_sync_data(tsd);
return 0;
}
/* acquire resolver thread synchronization */
static
BOOL acquire_thread_sync(struct thread_sync_data * tsd)
{
/* is the thread initiator still waiting for us ? */
if(WaitForSingleObject(tsd->mutex_waiting, 0) == WAIT_TIMEOUT) {
/* yes, it is */
/* Waiting access to event_terminate */
if(WaitForSingleObject(tsd->mutex_terminate, INFINITE) != WAIT_OBJECT_0) {
/* Something went wrong - now just ignoring */
}
else {
if(WaitForSingleObject(tsd->event_terminate, 0) != WAIT_TIMEOUT) {
/* Parent thread signaled us to terminate.
* This means that all data in conn->async is now destroyed
* and we cannot use it.
*/
}
else {
return TRUE;
}
}
}
return FALSE;
}
/* release resolver thread synchronization */
static
void release_thread_sync(struct thread_sync_data * tsd)
{
ReleaseMutex(tsd->mutex_terminate);
}
#if defined(CURLRES_IPV4)
/*
* gethostbyname_thread() resolves a name, calls the Curl_addrinfo_callback
* and then exits.
*
* For builds without ARES/ENABLE_IPV6, create a resolver thread and wait on
* it.
* gethostbyname_thread() resolves a name and then exits.
*/
static unsigned __stdcall gethostbyname_thread (void *arg)
static unsigned int CURL_STDCALL gethostbyname_thread (void *arg)
{
struct connectdata *conn = (struct connectdata*) arg;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
struct hostent *he;
int rc = 0;
struct thread_sync_data *tsd = (struct thread_sync_data *)arg;
/* Duplicate the passed mutex and event handles.
* This allows us to use it even after the container gets destroyed
* due to a resolver timeout.
*/
struct thread_sync_data tsd = { 0,0,0,NULL };
tsd->res = Curl_ipv4_resolve_r(tsd->hostname, tsd->port);
if(!init_thread_sync_data(td, conn->async.hostname, &tsd)) {
/* thread synchronization data initialization failed */
return (unsigned)-1;
}
if (!tsd->res) {
tsd->sock_error = SOCKERRNO;
if (tsd->sock_error == 0)
tsd->sock_error = ENOMEM;
}
conn->async.status = NO_DATA; /* pending status */
SET_SOCKERRNO(conn->async.status);
Curl_mutex_acquire(tsd->mtx);
tsd->done = 1;
Curl_mutex_release(tsd->mtx);
/* Signaling that we have initialized all copies of data and handles we
need */
SetEvent(td->event_thread_started);
he = gethostbyname (tsd.hostname);
/* is parent thread waiting for us and are we able to access conn members? */
if(acquire_thread_sync(&tsd)) {
Curl_addrinfo *ai = Curl_he2ai(he, conn->async.port);
/* Mark that we have obtained the information, and that we are calling
* back with it. */
SetEvent(td->event_resolved);
if(ai) {
rc = Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, ai);
}
else {
rc = Curl_addrinfo_callback(conn, SOCKERRNO, NULL);
}
release_thread_sync(&tsd);
}
/* clean up */
destroy_thread_sync_data(&tsd);
return (rc);
/* An implicit _endthreadex() here */
return 0;
}
#elif defined(CURLRES_IPV6)
static int getaddrinfo_complete(struct connectdata *conn)
{
struct thread_sync_data *tsd = conn_thread_sync_data(conn);
int rc;
rc = Curl_addrinfo_callback(conn, tsd->sock_error, tsd->res);
/* The tsd->res structure has been copied to async.dns and perhaps the DNS cache.
Set our copy to NULL so destroy_thread_sync_data doesn't free it.
*/
tsd->res = NULL;
return rc;
}
#if defined(HAVE_GETADDRINFO)
/*
* getaddrinfo_thread() resolves a name, calls Curl_addrinfo_callback and then
* exits.
* getaddrinfo_thread() resolves a name and then exits.
*
* For builds without ARES, but with ENABLE_IPV6, create a resolver thread
* and wait on it.
*/
static unsigned __stdcall getaddrinfo_thread (void *arg)
static unsigned int CURL_STDCALL getaddrinfo_thread (void *arg)
{
struct connectdata *conn = (struct connectdata*) arg;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
Curl_addrinfo *res;
struct thread_sync_data *tsd = (struct thread_sync_data*)arg;
char service [NI_MAXSERV];
int rc;
struct addrinfo hints = td->hints;
int rc;
/* Duplicate the passed mutex handle.
* This allows us to use it even after the container gets destroyed
* due to a resolver timeout.
*/
struct thread_sync_data tsd = { 0,0,0,NULL };
snprintf(service, sizeof(service), "%d", tsd->port);
if(!init_thread_sync_data(td, conn->async.hostname, &tsd)) {
/* thread synchronization data initialization failed */
return -1;
rc = Curl_getaddrinfo_ex(tsd->hostname, service, &tsd->hints, &tsd->res);
if (rc != 0) {
tsd->sock_error = SOCKERRNO;
if (tsd->sock_error == 0)
tsd->sock_error = ENOMEM;
}
itoa(conn->async.port, service, 10);
Curl_mutex_acquire(tsd->mtx);
tsd->done = 1;
Curl_mutex_release(tsd->mtx);
conn->async.status = NO_DATA; /* pending status */
SET_SOCKERRNO(conn->async.status);
/* Signaling that we have initialized all copies of data and handles we
need */
SetEvent(td->event_thread_started);
rc = Curl_getaddrinfo_ex(tsd.hostname, service, &hints, &res);
/* is parent thread waiting for us and are we able to access conn members? */
if(acquire_thread_sync(&tsd)) {
/* Mark that we have obtained the information, and that we are calling
back with it. */
SetEvent(td->event_resolved);
if(rc == 0) {
rc = Curl_addrinfo_callback(conn, CURL_ASYNC_SUCCESS, res);
}
else {
rc = Curl_addrinfo_callback(conn, SOCKERRNO, NULL);
}
release_thread_sync(&tsd);
}
/* clean up */
destroy_thread_sync_data(&tsd);
return (rc);
/* An implicit _endthreadex() here */
return 0;
}
#endif
#endif /* HAVE_GETADDRINFO */
/*
* Curl_destroy_thread_data() cleans up async resolver data and thread handle.
@ -349,39 +266,15 @@ void Curl_destroy_thread_data (struct Curl_async *async)
if(async->os_specific) {
struct thread_data *td = (struct thread_data*) async->os_specific;
curl_socket_t sock = td->dummy_sock;
if(td->mutex_terminate && td->event_terminate) {
/* Signaling resolver thread to terminate */
if(WaitForSingleObject(td->mutex_terminate, INFINITE) == WAIT_OBJECT_0) {
SetEvent(td->event_terminate);
ReleaseMutex(td->mutex_terminate);
}
else {
/* Something went wrong - just ignoring it */
}
}
if(td->mutex_terminate)
CloseHandle(td->mutex_terminate);
if(td->event_terminate)
CloseHandle(td->event_terminate);
if(td->event_thread_started)
CloseHandle(td->event_thread_started);
if(sock != CURL_SOCKET_BAD)
sclose(sock);
/* destroy the synchronization objects */
if(td->mutex_waiting)
CloseHandle(td->mutex_waiting);
td->mutex_waiting = NULL;
if(td->event_resolved)
CloseHandle(td->event_resolved);
if(td->thread_hnd)
CloseHandle(td->thread_hnd);
if (td->dummy_sock != CURL_SOCKET_BAD)
sclose(td->dummy_sock);
if (td->thread_hnd != curl_thread_t_null)
Curl_thread_join(&td->thread_hnd);
destroy_thread_sync_data(&td->tsd);
free(async->os_specific);
}
async->hostname = NULL;
@ -399,114 +292,58 @@ static bool init_resolve_thread (struct connectdata *conn,
const struct addrinfo *hints)
{
struct thread_data *td = calloc(1, sizeof(struct thread_data));
HANDLE thread_and_event[2] = {0};
int err = ENOMEM;
if(!td) {
SET_ERRNO(ENOMEM);
return FALSE;
}
Curl_safefree(conn->async.hostname);
conn->async.hostname = strdup(hostname);
if(!conn->async.hostname) {
free(td);
SET_ERRNO(ENOMEM);
return FALSE;
}
conn->async.os_specific = (void*) td;
if(!td)
goto err_exit;
conn->async.port = port;
conn->async.done = FALSE;
conn->async.status = 0;
conn->async.dns = NULL;
conn->async.os_specific = (void*) td;
td->dummy_sock = CURL_SOCKET_BAD;
td->thread_hnd = curl_thread_t_null;
/* Create the mutex used to inform the resolver thread that we're
* still waiting, and take initial ownership.
*/
td->mutex_waiting = CreateMutex(NULL, TRUE, NULL);
if(td->mutex_waiting == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
if (!init_thread_sync_data(&td->tsd, hostname, port, hints))
goto err_exit;
/* Create the event that the thread uses to inform us that it's
* done resolving. Do not signal it.
*/
td->event_resolved = CreateEvent(NULL, TRUE, FALSE, NULL);
if(td->event_resolved == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the mutex used to serialize access to event_terminated
* between us and resolver thread.
*/
td->mutex_terminate = CreateMutex(NULL, FALSE, NULL);
if(td->mutex_terminate == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the event used to signal thread that it should terminate.
*/
td->event_terminate = CreateEvent(NULL, TRUE, FALSE, NULL);
if(td->event_terminate == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
/* Create the event used by thread to inform it has initialized its own data.
*/
td->event_thread_started = CreateEvent(NULL, TRUE, FALSE, NULL);
if(td->event_thread_started == NULL) {
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(EAGAIN);
return FALSE;
}
Curl_safefree(conn->async.hostname);
conn->async.hostname = strdup(hostname);
if(!conn->async.hostname)
goto err_exit;
#ifdef _WIN32_WCE
td->thread_hnd = (HANDLE) CreateThread(NULL, 0,
(LPTHREAD_START_ROUTINE) THREAD_FUNC,
conn, 0, &td->thread_id);
#else
td->thread_hnd = (HANDLE) _beginthreadex(NULL, 0, THREAD_FUNC,
conn, 0, &td->thread_id);
#ifdef WIN32
/* This socket is only to keep Curl_resolv_fdset() and select() happy;
* should never become signalled for read since it's unbound but
* Windows needs at least 1 socket in select().
*/
td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
if (td->dummy_sock == CURL_SOCKET_BAD)
goto err_exit;
#endif
#ifdef CURLRES_IPV6
DEBUGASSERT(hints);
td->hints = *hints;
#ifdef HAVE_GETADDRINFO
td->thread_hnd = Curl_thread_create(getaddrinfo_thread, &td->tsd);
#else
(void) hints;
td->thread_hnd = Curl_thread_create(gethostbyname_thread, &td->tsd);
#endif
if(!td->thread_hnd) {
#ifndef _WIN32_WCE
SET_ERRNO(errno);
err = errno;
#endif
Curl_destroy_thread_data(&conn->async);
return FALSE;
goto err_exit;
}
/* Waiting until the thread will initialize its data or it will exit due errors.
*/
thread_and_event[0] = td->thread_hnd;
thread_and_event[1] = td->event_thread_started;
if(WaitForMultipleObjects(sizeof(thread_and_event) /
sizeof(thread_and_event[0]),
(const HANDLE*)thread_and_event, FALSE,
INFINITE) == WAIT_FAILED) {
/* The resolver thread has been created,
* most probably it works now - ignoring this "minor" error
*/
}
/* This socket is only to keep Curl_resolv_fdset() and select() happy;
* should never become signalled for read/write since it's unbound but
* Windows needs atleast 1 socket in select().
*/
td->dummy_sock = socket(AF_INET, SOCK_DGRAM, 0);
return TRUE;
err_exit:
Curl_destroy_thread_data(&conn->async);
SET_ERRNO(err);
return FALSE;
}
@ -523,84 +360,33 @@ CURLcode Curl_wait_for_resolv(struct connectdata *conn,
{
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
struct SessionHandle *data = conn->data;
long timeout;
DWORD status;
CURLcode rc;
DEBUGASSERT(conn && td);
/* now, see if there's a connect timeout or a regular timeout to
use instead of the default one */
timeout =
conn->data->set.connecttimeout ? conn->data->set.connecttimeout :
conn->data->set.timeout ? conn->data->set.timeout :
CURL_TIMEOUT_RESOLVE * 1000; /* default name resolve timeout */
/* wait for the thread to resolve the name */
status = WaitForSingleObject(td->event_resolved, timeout);
/* mark that we are now done waiting */
ReleaseMutex(td->mutex_waiting);
/* close our handle to the mutex, no point in hanging on to it */
CloseHandle(td->mutex_waiting);
td->mutex_waiting = NULL;
/* close the event handle, it's useless now */
CloseHandle(td->event_resolved);
td->event_resolved = NULL;
/* has the resolver thread succeeded in resolving our query ? */
if(status == WAIT_OBJECT_0) {
/* wait for the thread to exit, it's in the callback sequence */
if(WaitForSingleObject(td->thread_hnd, 5000) == WAIT_TIMEOUT) {
TerminateThread(td->thread_hnd, 0);
conn->async.done = TRUE;
td->thread_status = (DWORD)-1;
}
else {
/* Thread finished before timeout; propagate Winsock error to this
* thread. 'conn->async.done = TRUE' is set in
* Curl_addrinfo4/6_callback().
*/
SET_SOCKERRNO(conn->async.status);
GetExitCodeThread(td->thread_hnd, &td->thread_status);
}
}
else {
conn->async.done = TRUE;
td->thread_status = (DWORD)-1;
if (Curl_thread_join(&td->thread_hnd)) {
rc = getaddrinfo_complete(conn);
} else {
DEBUGASSERT(0);
}
conn->async.done = TRUE;
if(entry)
*entry = conn->async.dns;
rc = CURLE_OK;
if(!conn->async.dns) {
/* a name was not resolved */
if(td->thread_status == CURLE_OUT_OF_MEMORY) {
rc = CURLE_OUT_OF_MEMORY;
failf(data, "Could not resolve host: %s", curl_easy_strerror(rc));
if (conn->bits.httpproxy) {
failf(data, "Could not resolve proxy: %s; %s",
conn->async.hostname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_PROXY;
} else {
failf(data, "Could not resolve host: %s; %s",
conn->async.hostname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_HOST;
}
else if(conn->async.done) {
if(conn->bits.httpproxy) {
failf(data, "Could not resolve proxy: %s; %s",
conn->proxy.dispname, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_PROXY;
}
else {
failf(data, "Could not resolve host: %s; %s",
conn->host.name, Curl_strerror(conn, conn->async.status));
rc = CURLE_COULDNT_RESOLVE_HOST;
}
}
else if(td->thread_status == (DWORD)-1 || conn->async.status == NO_DATA) {
failf(data, "Resolving host timed out: %s", conn->host.name);
rc = CURLE_OPERATION_TIMEDOUT;
}
else
rc = CURLE_OPERATION_TIMEDOUT;
}
Curl_destroy_thread_data(&conn->async);
@ -620,19 +406,57 @@ CURLcode Curl_is_resolved(struct connectdata *conn,
struct Curl_dns_entry **entry)
{
struct SessionHandle *data = conn->data;
struct thread_data *td = (struct thread_data*) conn->async.os_specific;
int done = 0;
*entry = NULL;
if(conn->async.done) {
/* we're done */
if (!td) {
DEBUGASSERT(td);
return CURLE_COULDNT_RESOLVE_HOST;
}
Curl_mutex_acquire(td->tsd.mtx);
done = td->tsd.done;
Curl_mutex_release(td->tsd.mtx);
if (done) {
getaddrinfo_complete(conn);
if (td->poll_interval != 0)
Curl_expire(conn->data, 0);
Curl_destroy_thread_data(&conn->async);
if(!conn->async.dns) {
failf(data, "Could not resolve host: %s; %s",
conn->host.name, Curl_strerror(conn, conn->async.status));
return CURLE_COULDNT_RESOLVE_HOST;
}
*entry = conn->async.dns;
} else {
/* poll for name lookup done with exponential backoff up to 250ms */
int elapsed;
elapsed = Curl_tvdiff(Curl_tvnow(), data->progress.t_startsingle);
if (elapsed < 0) {
elapsed = 0;
}
if (td->poll_interval == 0) {
/* Start at 1ms poll interval */
td->poll_interval = 1;
} else if (elapsed >= td->interval_end) {
/* Back-off exponentially if last interval expired */
td->poll_interval *= 2;
}
if (td->poll_interval > 250)
td->poll_interval = 250;
td->interval_end = elapsed + td->poll_interval;
Curl_expire(conn->data, td->poll_interval);
}
return CURLE_OK;
}
@ -645,18 +469,18 @@ int Curl_resolv_getsock(struct connectdata *conn,
if(td && td->dummy_sock != CURL_SOCKET_BAD) {
if(numsocks) {
/* return one socket waiting for writable, even though this is just
/* return one socket waiting for readable, even though this is just
a dummy */
socks[0] = td->dummy_sock;
return GETSOCK_WRITESOCK(0);
return GETSOCK_READSOCK(0);
}
}
return 0;
}
#ifdef CURLRES_IPV4
#if !defined(HAVE_GETADDRINFO)
/*
* Curl_getaddrinfo() - for Windows threading without ENABLE_IPV6.
* Curl_getaddrinfo() - for platforms without getaddrinfo
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
@ -667,7 +491,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
struct SessionHandle *data = conn->data;
struct in_addr in;
*waitp = 0; /* don't wait, we act synchronously */
*waitp = 0; /* default to synchronous response */
if(Curl_inet_pton(AF_INET, hostname, &in) > 0)
/* This is a dotted IP address 123.123.123.123-style */
@ -675,27 +499,18 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, NULL)) {
*waitp = TRUE; /* please wait for the response */
*waitp = 1; /* expect asynchronous response */
return NULL;
}
/* fall-back to blocking version */
infof(data, "init_resolve_thread() failed for %s; %s\n",
hostname, Curl_strerror(conn, ERRNO));
h = gethostbyname(hostname);
if(!h) {
infof(data, "gethostbyname(2) failed for %s:%d; %s\n",
hostname, port, Curl_strerror(conn, SOCKERRNO));
return NULL;
}
return Curl_he2ai(h, port);
return Curl_ipv4_resolve_r(hostname, port);
}
#endif /* CURLRES_IPV4 */
#ifdef CURLRES_IPV6
#else /* HAVE_GETADDRINFO */
/*
* Curl_getaddrinfo() - for Windows threading IPv6 enabled
* Curl_getaddrinfo() - for getaddrinfo
*/
Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
const char *hostname,
@ -706,11 +521,12 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
Curl_addrinfo *res;
int error;
char sbuf[NI_MAXSERV];
int pf;
int pf = PF_INET;
struct SessionHandle *data = conn->data;
*waitp = FALSE; /* default to synch response */
*waitp = 0; /* default to synchronous response */
#if !defined(CURLRES_IPV4)
/*
* Check if a limited name resolve has been requested.
*/
@ -743,6 +559,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
sclose(s);
}
}
#endif /* !CURLRES_IPV4 */
memset(&hints, 0, sizeof(hints));
hints.ai_family = pf;
@ -750,11 +567,11 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
#if 0 /* removed nov 8 2005 before 7.15.1 */
hints.ai_flags = AI_CANONNAME;
#endif
itoa(port, sbuf, 10);
snprintf(sbuf, sizeof(sbuf), "%d", port);
/* fire up a new resolver thread! */
if(init_resolve_thread(conn, hostname, port, &hints)) {
*waitp = TRUE; /* please wait for the response */
*waitp = 1; /* expect asynchronous response */
return NULL;
}
@ -770,5 +587,7 @@ Curl_addrinfo *Curl_getaddrinfo(struct connectdata *conn,
}
return res;
}
#endif /* CURLRES_IPV6 */
#endif /* HAVE_GETADDRINFO */
#endif /* CURLRES_THREADED */