mirror of
https://github.com/curl/curl.git
synced 2024-11-27 05:50:21 +08:00
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#include <curl/curl.h>
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#ifdef USE_LIBPSL
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#include "psl.h"
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#include "share.h"
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/* The last 3 #include files should be in this order */
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#include "curl_printf.h"
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#include "curl_memory.h"
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#include "memdebug.h"
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void Curl_psl_destroy(struct PslCache *pslcache)
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{
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if(pslcache->psl) {
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if(pslcache->dynamic)
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psl_free((psl_ctx_t *) pslcache->psl);
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pslcache->psl = NULL;
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pslcache->dynamic = FALSE;
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}
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}
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static time_t now_seconds(void)
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{
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struct curltime now = Curl_now();
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return now.tv_sec;
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}
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const psl_ctx_t *Curl_psl_use(struct Curl_easy *easy)
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{
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struct PslCache *pslcache = easy->psl;
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const psl_ctx_t *psl;
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time_t now;
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if(!pslcache)
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return NULL;
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Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
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now = now_seconds();
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if(!pslcache->psl || pslcache->expires <= now) {
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/* Let a chance to other threads to do the job: avoids deadlock. */
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Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
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/* Update cache: this needs an exclusive lock. */
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Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SINGLE);
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/* Recheck in case another thread did the job. */
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now = now_seconds();
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if(!pslcache->psl || pslcache->expires <= now) {
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bool dynamic = FALSE;
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time_t expires = TIME_T_MAX;
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#if defined(PSL_VERSION_NUMBER) && PSL_VERSION_NUMBER >= 0x001000
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psl = psl_latest(NULL);
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dynamic = psl != NULL;
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/* Take care of possible time computation overflow. */
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expires = now < TIME_T_MAX - PSL_TTL ? now + PSL_TTL : TIME_T_MAX;
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/* Only get the built-in PSL if we do not already have the "latest". */
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if(!psl && !pslcache->dynamic)
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#endif
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psl = psl_builtin();
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if(psl) {
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Curl_psl_destroy(pslcache);
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pslcache->psl = psl;
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pslcache->dynamic = dynamic;
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pslcache->expires = expires;
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}
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}
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Curl_share_unlock(easy, CURL_LOCK_DATA_PSL); /* Release exclusive lock. */
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Curl_share_lock(easy, CURL_LOCK_DATA_PSL, CURL_LOCK_ACCESS_SHARED);
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}
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psl = pslcache->psl;
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if(!psl)
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Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
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return psl;
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}
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void Curl_psl_release(struct Curl_easy *easy)
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{
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Curl_share_unlock(easy, CURL_LOCK_DATA_PSL);
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}
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#endif /* USE_LIBPSL */
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