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ircd::ctx: Handle exception before unwind of class members; comments.

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This commit is contained in:
Jason Volk 2019-06-23 16:40:40 -07:00
parent 31560dbc83
commit 708b34092f
1 changed files with 17 additions and 11 deletions
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28
ircd/ctx.cc
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@ -1029,7 +1029,6 @@ struct __cxxabiv1::__cxa_eh_globals
ircd::ctx::continuation::continuation(const predicate &pred,
const interruptor &intr,
const yield_closure &closure)
try
:self
{
ircd::ctx::current
@ -1085,21 +1084,28 @@ try
assert(!uncaught_exceptions);
#endif
// Check that we saved a valid context reference to this object for later.
assert(self->yc);
// Null the fundamental current context register as the last operation
// during execution before yielding. When a context resumes it will
// restore this register; otherwise it remains null for executions on
// the program's main stack.
ircd::ctx::current = nullptr;
ircd::ctx::current = nullptr; try
{
// Run the provided routine which performs the actual context switch.
// Everything happening in this closure is no longer considered part
// of this context, but it is technically operating on this stack.
closure(*self->yc);
assert(self->yc);
closure(*self->yc);
// Check here if the context was interrupted while it was sleeping.
self->interruption_point();
}
catch(...)
{
this->~continuation();
// Check for an interrupt that was sent while asleep. This will throw.
self->interruption_point();
}
catch(...)
{
this->~continuation();
throw;
}
}
ircd::ctx::continuation::~continuation()