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ircd::ctx: Move paragraph in README.

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Jason Volk 2020-01-11 17:58:17 -08:00
parent 9469099508
commit e2e4ea544b
1 changed files with 7 additions and 7 deletions
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14
include/ircd/ctx/README.md
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@ -29,6 +29,13 @@ that are less predictable. Contexts will accomplish as much work as possible
in a "straight line" before yielding to the kernel to wait for the completion
of any I/O event.
> There is no preemptive interleaving of contexts. This makes every sequence
of instructions executed a natural transaction requiring no other method of
exclusion. It also allows for introspective conditions, i.e: check if context
switch occurred: if so, refresh value; if not, the old value is good. This is
impossible in a preemptive environment as the result may have changed at
instruction boundaries rather than at cooperative boundaries.
### Foundation
This library is based in `boost::coroutine / boost::context` which wraps
@ -59,13 +66,6 @@ a child context may never be able to complete (or even be entered at all!)
if the parent constructs and then desctructs `context` without either any flags
or any strategy by the parent to wait for completion.
> There is no preemptive interleaving of contexts. This makes every sequence
of instructions executed a natural transaction requiring no other method of
exclusion. It also allows for introspective conditions, i.e: if context switch
occurred: refresh value, else the old value is good. This is impossible in a
preemptive environment as the result may have changed at instruction boundaries
rather than at cooperative boundaries.
### Context Switching
A context switch has the overhead of a heavy function call -- a function with