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common: fiber: YieldTo: Avoid hard crash on nullptr previous_fiber. 

- When the emulator crashes to desktop below, we don't even get this captured in a log, making such issues harder to debug.
This commit is contained in:
bunnei 2022-01-14 16:17:19 -08:00
parent b2d45a4072
commit f6de57c1a5
1 changed files with 4 additions and 1 deletions
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5
src/common/fiber.cpp
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@ -124,7 +124,10 @@ void Fiber::YieldTo(std::weak_ptr<Fiber> weak_from, Fiber& to) {
// "from" might no longer be valid if the thread was killed
if (auto from = weak_from.lock()) {
ASSERT(from->impl->previous_fiber != nullptr);
if (from->impl->previous_fiber == nullptr) {
ASSERT_MSG(false, "previous_fiber is nullptr!");
return;
}
from->impl->previous_fiber->impl->context = transfer.fctx;
from->impl->previous_fiber->impl->guard.unlock();
from->impl->previous_fiber.reset();