Hi!
I'm building an OS kernel on V8 JavaScript engine (
https://github.com/runtimejs/runtime ). I use separate V8 isolate for every
application. And I'd like to implement preemption using
Isolate::RequestInterrupt().
The problem is that I need to call Isolate::RequestInterrupt() from timer
IRQ interrupt handler and it often deadlocks here:
(execution.cc)
void StackGuard::RequestInterrupt(InterruptFlag flag) {
ExecutionAccess access(isolate_); <------------------------- DEADLOCK
// Check the chain of PostponeInterruptsScopes for interception.
if (thread_local_.postpone_interrupts_ &&
thread_local_.postpone_interrupts_->Intercept(flag)) {
return;
}
...
because interrupt can occur when ExecutionAccess mutex is locked.
Because of this i'm using this dirty hack
https://github.com/runtimejs/runtime/commit/f3344daf9b1e3384a76566a7f91ef883444ba220
This way it works fine (returns when mutex is locked).
Question: Is it possible to expose an API something like
TryExecutionAccessLock() or TryRequestInterrupt() that never blocks? Or is
it possible to replace interrupt check/request mutex with atomic operations?
Thank you.
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