forked from cory/tildefriends
Add prebuild OpenSSL, and remove SCHANNEL code and whatever it was on MacOS. Build mingw for 64-bit.
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
This commit is contained in:
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deps/openssl/mingw64/share/man/man3/OPENSSL_instrument_bus.3
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.\" ========================================================================
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.\"
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.IX Title "OPENSSL_INSTRUMENT_BUS 3"
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.TH OPENSSL_INSTRUMENT_BUS 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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OPENSSL_instrument_bus, OPENSSL_instrument_bus2 \- instrument references to memory bus
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 4
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\& #ifdef OPENSSL_CPUID_OBJ
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\& size_t OPENSSL_instrument_bus(int *vector, size_t num);
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\& size_t OPENSSL_instrument_bus2(int *vector, size_t num, size_t max);
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\& #endif
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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It was empirically found that timings of references to primary memory
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are subject to irregular, apparently non-deterministic variations. The
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subroutines in question instrument these references for purposes of
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gathering randomness for random number generator. In order to make it
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bus-bound a 'flush cache line' instruction is used between probes. In
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addition probes are added to \fBvector\fR elements in atomic or
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interlocked manner, which should contribute additional noise on
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multi-processor systems. This also means that \fBvector[num]\fR should be
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zeroed upon invocation (if you want to retrieve actual probe values).
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.PP
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\&\fBOPENSSL_instrument_bus()\fR performs \fBnum\fR probes and records the number of
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oscillator cycles every probe took.
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.PP
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\&\fBOPENSSL_instrument_bus2()\fR on the other hand \fBaccumulates\fR consecutive
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probes with the same value, i.e. in a way it records duration of
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periods when probe values appeared deterministic. The subroutine
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performs at most \fBmax\fR probes in attempt to fill the \fBvector[num]\fR,
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with \fBmax\fR value of 0 meaning \*(L"as many as it takes.\*(R"
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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Return value of 0 indicates that \s-1CPU\s0 is not capable of performing the
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benchmark, either because oscillator counter or 'flush cache line' is
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not available on current platform. For reference, on x86 'flush cache
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line' was introduced with the \s-1SSE2\s0 extensions.
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.PP
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Otherwise number of recorded values is returned.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2011\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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