Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/thirdparty/curl/docs/libcurl/libcurl-thread.3 @ 22:d77477b4e151

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Let _int_rc() also handle (i.e. ignore) a local version suffix
author Franz Glasner <fzglas.hg@dom66.de>
date Fri, 19 Sep 2025 12:05:57 +0200
parents b50eed0cc0ef
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 .\" **************************************************************************
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2 .\" * _ _ ____ _
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3 .\" * Project ___| | | | _ \| |
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4 .\" * / __| | | | |_) | |
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5 .\" * | (__| |_| | _ <| |___
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6 .\" * \___|\___/|_| \_\_____|
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7 .\" *
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8 .\" * Copyright (C) 2015 - 2019, Daniel Stenberg, <daniel@haxx.se>, et al.
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9 .\" *
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10 .\" * This software is licensed as described in the file COPYING, which
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11 .\" * you should have received as part of this distribution. The terms
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12 .\" * are also available at https://curl.haxx.se/docs/copyright.html.
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13 .\" *
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14 .\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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15 .\" * copies of the Software, and permit persons to whom the Software is
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16 .\" * furnished to do so, under the terms of the COPYING file.
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17 .\" *
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18 .\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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19 .\" * KIND, either express or implied.
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20 .\" *
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21 .\" **************************************************************************
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22 .\"
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23 .TH libcurl-thread 3 "13 Jul 2015" "libcurl" "libcurl thread safety"
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24 .SH NAME
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25 libcurl-thread \- libcurl thread safety
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26 .SH "Multi-threading with libcurl"
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27 libcurl is thread safe but has no internal thread synchronization. You may have
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28 to provide your own locking should you meet any of the thread safety exceptions
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29 below.
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31 \fBHandles.\fP You must \fBnever\fP share the same handle in multiple threads.
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32 You can pass the handles around among threads, but you must never use a single
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33 handle from more than one thread at any given time.
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34
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35 \fBShared objects.\fP You can share certain data between multiple handles by
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36 using the share interface but you must provide your own locking and set
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37 \fIcurl_share_setopt(3)\fP CURLSHOPT_LOCKFUNC and CURLSHOPT_UNLOCKFUNC.
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38 .SH TLS
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39 If you are accessing HTTPS or FTPS URLs in a multi-threaded manner, you are
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40 then of course using the underlying SSL library multi-threaded and those libs
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41 might have their own requirements on this issue. You may need to provide one
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42 or two functions to allow it to function properly:
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43 .IP OpenSSL
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44 OpenSSL 1.1.0+ "can be safely used in multi-threaded applications provided that
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45 support for the underlying OS threading API is built-in." In that case the
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46 engine is used by libcurl in a way that is fully thread-safe.
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47
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48 https://www.openssl.org/docs/man1.1.0/man3/CRYPTO_THREAD_run_once.html#DESCRIPTION
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49
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50 OpenSSL <= 1.0.2 the user must set callbacks.
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51
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52 https://www.openssl.org/docs/man1.0.2/man3/CRYPTO_set_locking_callback.html#DESCRIPTION
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54 https://curl.haxx.se/libcurl/c/opensslthreadlock.html
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55
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56 .IP GnuTLS
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57 https://gnutls.org/manual/html_node/Thread-safety.html
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58 .IP NSS
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59 thread-safe already without anything required.
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60 .IP Secure-Transport
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61 The engine is used by libcurl in a way that is fully thread-safe.
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62 .IP WinSSL
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63 The engine is used by libcurl in a way that is fully thread-safe.
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64 .IP wolfSSL
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65 The engine is used by libcurl in a way that is fully thread-safe.
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66 .IP BoringSSL
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67 The engine is used by libcurl in a way that is fully thread-safe.
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68 .SH "Other areas of caution"
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69 .IP Signals
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70 Signals are used for timing out name resolves (during DNS lookup) - when built
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71 without using either the c-ares or threaded resolver backends. When using
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72 multiple threads you should set the \fICURLOPT_NOSIGNAL(3)\fP option to 1L for
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73 all handles. Everything will or might work fine except that timeouts are not
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74 honored during the DNS lookup - which you can work around by building libcurl
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75 with c-ares or threaded-resolver support. c-ares is a library that provides
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76 asynchronous name resolves. On some platforms, libcurl simply will not
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77 function properly multi-threaded unless the \fICURLOPT_NOSIGNAL(3)\fP option
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78 is set.
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79
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80 When \fICURLOPT_NOSIGNAL(3)\fP is set to 1L, your application needs to deal
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81 with the risk of a SIGPIPE (that at least the OpenSSL backend can
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82 trigger). Note that setting \fICURLOPT_NOSIGNAL(3)\fP to 0L will not work in a
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83 threaded situation as there will be race where libcurl risks restoring the
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84 former signal handler while another thread should still ignore it.
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85 .IP "Name resolving"
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86 \fBgethostby* functions and other system calls.\fP These functions, provided
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87 by your operating system, must be thread safe. It is very important that
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88 libcurl can find and use thread safe versions of these and other system calls,
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89 as otherwise it can't function fully thread safe. Some operating systems are
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90 known to have faulty thread implementations. We have previously received
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91 problem reports on *BSD (at least in the past, they may be working fine these
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92 days). Some operating systems that are known to have solid and working thread
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93 support are Linux, Solaris and Windows.
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94 .IP "curl_global_* functions"
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95 These functions are not thread safe. If you are using libcurl with multiple
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96 threads it is especially important that before use you call
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97 \fIcurl_global_init(3)\fP or \fIcurl_global_init_mem(3)\fP to explicitly
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98 initialize the library and its dependents, rather than rely on the "lazy"
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99 fail-safe initialization that takes place the first time
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100 \fIcurl_easy_init(3)\fP is called. For an in-depth explanation refer to
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101 \fIlibcurl(3)\fP section \fBGLOBAL CONSTANTS\fP.
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102 .IP "Memory functions"
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103 These functions, provided either by your operating system or your own
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104 replacements, must be thread safe. You can use \fIcurl_global_init_mem(3)\fP
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105 to set your own replacement memory functions.
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106 .IP "Non-safe functions"
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107 \fICURLOPT_DNS_USE_GLOBAL_CACHE(3)\fP is not thread-safe.