diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/asyn-ares.c | 19 | ||||
| -rw-r--r-- | lib/asyn-thread.c | 25 | ||||
| -rw-r--r-- | lib/asyn.h | 27 | ||||
| -rw-r--r-- | lib/multi.c | 7 |
4 files changed, 61 insertions, 17 deletions
diff --git a/lib/asyn-ares.c b/lib/asyn-ares.c index 6a49566c8..04a25b321 100644 --- a/lib/asyn-ares.c +++ b/lib/asyn-ares.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2019, 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 @@ -199,6 +199,17 @@ void Curl_resolver_cancel(struct connectdata *conn) } /* + * We're equivalent to Curl_resolver_cancel() for the c-ares resolver. We + * never block. + */ +void Curl_resolver_kill(struct connectdata *conn) +{ + /* We don't need to check the resolver state because we can be called safely + at any time and we always do the same thing. */ + Curl_resolver_cancel(conn); +} + +/* * destroy_async_data() cleans up async resolver data. */ static void destroy_async_data(struct Curl_async *async) @@ -361,13 +372,13 @@ CURLcode Curl_resolver_is_resolved(struct connectdata *conn, /* * Curl_resolver_wait_resolv() * - * waits for a resolve to finish. This function should be avoided since using + * Waits for a resolve to finish. This function should be avoided since using * this risk getting the multi interface to "hang". * * If 'entry' is non-NULL, make it point to the resolved dns entry * - * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, and - * CURLE_OPERATION_TIMEDOUT if a time-out occurred. + * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, + * CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors. */ CURLcode Curl_resolver_wait_resolv(struct connectdata *conn, struct Curl_dns_entry **entry) diff --git a/lib/asyn-thread.c b/lib/asyn-thread.c index 74208d7ec..a9679d062 100644 --- a/lib/asyn-thread.c +++ b/lib/asyn-thread.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2019, 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 @@ -462,13 +462,33 @@ static CURLcode resolver_error(struct connectdata *conn) } /* + * Until we gain a way to signal the resolver threads to stop early, we must + * simply wait for them and ignore their results. + */ +void Curl_resolver_kill(struct connectdata *conn) +{ + struct thread_data *td = (struct thread_data*) conn->async.os_specific; + + /* If we're still resolving, we must wait for the threads to fully clean up, + unfortunately. Otherwise, we can simply cancel to clean up any resolver + data. */ + if(td && td->thread_hnd != curl_thread_t_null) + (void)Curl_resolver_wait_resolv(conn, NULL); + else + Curl_resolver_cancel(conn); +} + +/* * Curl_resolver_wait_resolv() * - * waits for a resolve to finish. This function should be avoided since using + * Waits for a resolve to finish. This function should be avoided since using * this risk getting the multi interface to "hang". * * If 'entry' is non-NULL, make it point to the resolved dns entry * + * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, + * CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors. + * * This is the version for resolves-in-a-thread. */ CURLcode Curl_resolver_wait_resolv(struct connectdata *conn, @@ -478,6 +498,7 @@ CURLcode Curl_resolver_wait_resolv(struct connectdata *conn, CURLcode result = CURLE_OK; DEBUGASSERT(conn && td); + DEBUGASSERT(td->thread_hnd != curl_thread_t_null); /* wait for the thread to resolve the name */ if(Curl_thread_join(&td->thread_hnd)) { diff --git a/lib/asyn.h b/lib/asyn.h index 43625bc3b..ccd4b1f7e 100644 --- a/lib/asyn.h +++ b/lib/asyn.h @@ -7,7 +7,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2011, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2019, 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 @@ -87,10 +87,25 @@ CURLcode Curl_resolver_duphandle(struct Curl_easy *easy, void **to, * * It is called from inside other functions to cancel currently performing * resolver request. Should also free any temporary resources allocated to - * perform a request. + * perform a request. This never waits for resolver threads to complete. + * + * It is safe to call this when conn is in any state. */ void Curl_resolver_cancel(struct connectdata *conn); +/* + * Curl_resolver_kill(). + * + * This acts like Curl_resolver_cancel() except it will block until any threads + * associated with the resolver are complete. This never blocks for resolvers + * that do not use threads. This is intended to be the "last chance" function + * that cleans up an in-progress resolver completely (before its owner is about + * to die). + * + * It is safe to call this when conn is in any state. + */ +void Curl_resolver_kill(struct connectdata *conn); + /* Curl_resolver_getsock() * * This function is called from the multi_getsock() function. 'sock' is a @@ -117,14 +132,13 @@ CURLcode Curl_resolver_is_resolved(struct connectdata *conn, /* * Curl_resolver_wait_resolv() * - * waits for a resolve to finish. This function should be avoided since using + * Waits for a resolve to finish. This function should be avoided since using * this risk getting the multi interface to "hang". * * If 'entry' is non-NULL, make it point to the resolved dns entry * - * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, and - * CURLE_OPERATION_TIMEDOUT if a time-out occurred. - + * Returns CURLE_COULDNT_RESOLVE_HOST if the host was not resolved, + * CURLE_OPERATION_TIMEDOUT if a time-out occurred, or other errors. */ CURLcode Curl_resolver_wait_resolv(struct connectdata *conn, struct Curl_dns_entry **dnsentry); @@ -148,6 +162,7 @@ Curl_addrinfo *Curl_resolver_getaddrinfo(struct connectdata *conn, #ifndef CURLRES_ASYNCH /* convert these functions if an asynch resolver isn't used */ #define Curl_resolver_cancel(x) Curl_nop_stmt +#define Curl_resolver_kill(x) Curl_nop_stmt #define Curl_resolver_is_resolved(x,y) CURLE_COULDNT_RESOLVE_HOST #define Curl_resolver_wait_resolv(x,y) CURLE_COULDNT_RESOLVE_HOST #define Curl_resolver_getsock(x,y,z) 0 diff --git a/lib/multi.c b/lib/multi.c index 54d954e65..249280f2b 100644 --- a/lib/multi.c +++ b/lib/multi.c @@ -537,10 +537,8 @@ static CURLcode multi_done(struct connectdata **connp, /* Stop if multi_done() has already been called */ return CURLE_OK; - if(data->mstate == CURLM_STATE_WAITRESOLVE) { - /* still waiting for the resolve to complete */ - (void)Curl_resolver_wait_resolv(conn, NULL); - } + /* Stop the resolver and free its own resources (but not dns_entry yet). */ + Curl_resolver_kill(conn); Curl_getoff_all_pipelines(data, conn); @@ -587,7 +585,6 @@ static CURLcode multi_done(struct connectdata **connp, } data->state.done = TRUE; /* called just now! */ - Curl_resolver_cancel(conn); if(conn->dns_entry) { Curl_resolv_unlock(data, conn->dns_entry); /* done with this */ |