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Update docs section about use of global variables.

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It referred to the global variable 'flags' as an example. But 'flags'
was retired (and good riddance) nearly a year ago, in commit
4ea811a0bf. So we should be using a different example now!
This commit is contained in:
Simon Tatham 2020-12-26 15:40:04 +00:00
parent 875a887c8f
commit 1f8b3b5535
1 changed files with 5 additions and 6 deletions
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doc/udp.but
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@ -142,12 +142,11 @@ potentially managing multiple sessions.
Therefore, the platform-independent parts of PuTTY never use global
variables to store per-session data. The global variables that do
exist are tolerated because they are not specific to a particular
login session: \c{flags} defines properties that are expected to
apply equally to \e{all} the sessions run by a single PuTTY process,
the random number state in \cw{sshrand.c} and the timer list in
\cw{timing.c} serve all sessions equally, and so on. But most data
is specific to a particular network session, and is therefore stored
in dynamically allocated data structures, and pointers to these
login session. The random number state in \cw{sshrand.c}, the timer
list in \cw{timing.c} and the queue of top-level callbacks in
\cw{callback.c} serve all sessions equally. But most data is specific
to a particular network session, and is therefore stored in
dynamically allocated data structures, and pointers to these
structures are passed around between functions.
Platform-specific code can reverse this decision if it likes. The