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Diffstat (limited to 'secure/lib/libcrypto/man/threads.3')
-rw-r--r-- | secure/lib/libcrypto/man/threads.3 | 296 |
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diff --git a/secure/lib/libcrypto/man/threads.3 b/secure/lib/libcrypto/man/threads.3 new file mode 100644 index 0000000..fea2b86 --- /dev/null +++ b/secure/lib/libcrypto/man/threads.3 @@ -0,0 +1,296 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Thu May 9 13:19:45 2002 +.\" +.\" Standard preamble: +.\" ====================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R + +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used +.\" to do unbreakable dashes and therefore won't be available. \*(C` and +.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<> +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr +.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and +.\" index entries marked with X<> in POD. Of course, you'll have to process +.\" the output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. Always turn off hyphenation; it +.\" makes way too many mistakes in technical documents. +.hy 0 +.if n .na +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. 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It sets the \fBn\fR\-th lock if \fBmode\fR & +\&\fB\s-1CRYPTO_LOCK\s0\fR, and releases it otherwise. +.PP +\&\fBfile\fR and \fBline\fR are the file number of the function setting the +lock. They can be useful for debugging. +.PP +id_function(void) is a function that returns a thread \s-1ID\s0. It is not +needed on Windows nor on platforms where \fIgetpid()\fR returns a different +\&\s-1ID\s0 for each thread (most notably Linux). +.PP +Additionally, OpenSSL supports dynamic locks, and sometimes, some parts +of OpenSSL need it for better performance. To enable this, the following +is required: +.Ip "\(bu Three additional callback function, dyn_create_function, dyn_lock_function and dyn_destroy_function." 4 +.IX Item "Three additional callback function, dyn_create_function, dyn_lock_function and dyn_destroy_function." +.PD 0 +.Ip "\(bu A structure defined with the data that each lock needs to handle." 4 +.IX Item "A structure defined with the data that each lock needs to handle." +.PD +.PP +struct CRYPTO_dynlock_value has to be defined to contain whatever structure +is needed to handle locks. +.PP +dyn_create_function(const char *file, int line) is needed to create a +lock. Multi-threaded applications might crash at random if it is not set. +.PP +dyn_lock_function(int mode, CRYPTO_dynlock *l, const char *file, int line) +is needed to perform locking off dynamic lock numbered n. Multi-threaded +applications might crash at random if it is not set. +.PP +dyn_destroy_function(CRYPTO_dynlock *l, const char *file, int line) is +needed to destroy the lock l. Multi-threaded applications might crash at +random if it is not set. +.PP +\&\fICRYPTO_get_new_dynlockid()\fR is used to create locks. It will call +dyn_create_function for the actual creation. +.PP +\&\fICRYPTO_destroy_dynlockid()\fR is used to destroy locks. It will call +dyn_destroy_function for the actual destruction. +.PP +\&\fICRYPTO_lock()\fR is used to lock and unlock the locks. mode is a bitfield +describing what should be done with the lock. n is the number of the +lock as returned from \fICRYPTO_get_new_dynlockid()\fR. mode can be combined +from the following values. These values are pairwise exclusive, with +undefined behaviour if misused (for example, \s-1CRYPTO_READ\s0 and \s-1CRYPTO_WRITE\s0 +should not be used together): +.PP +.Vb 4 +\& CRYPTO_LOCK 0x01 +\& CRYPTO_UNLOCK 0x02 +\& CRYPTO_READ 0x04 +\& CRYPTO_WRITE 0x08 +.Ve +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fICRYPTO_num_locks()\fR returns the required number of locks. +.PP +\&\fICRYPTO_get_new_dynlockid()\fR returns the index to the newly created lock. +.PP +The other functions return no values. +.SH "NOTE" +.IX Header "NOTE" +You can find out if OpenSSL was configured with thread support: +.PP +.Vb 7 +\& #define OPENSSL_THREAD_DEFINES +\& #include <openssl/opensslconf.h> +\& #if defined(THREADS) +\& // thread support enabled +\& #else +\& // no thread support +\& #endif +.Ve +Also, dynamic locks are currently not used internally by OpenSSL, but +may do so in the future. +.SH "EXAMPLES" +.IX Header "EXAMPLES" +\&\fBcrypto/threads/mttest.c\fR shows examples of the callback functions on +Solaris, Irix and Win32. +.SH "HISTORY" +.IX Header "HISTORY" +\&\fICRYPTO_set_locking_callback()\fR and \fICRYPTO_set_id_callback()\fR are +available in all versions of SSLeay and OpenSSL. +\&\fICRYPTO_num_locks()\fR was added in OpenSSL 0.9.4. +All functions dealing with dynamic locks were added in OpenSSL 0.9.5b-dev. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +crypto(3) |