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rt: Change the scheme used for terminating the kernel

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Instead of joining on the scheduler threads, instead keep a count of active
schedulers. When there are no more schedulers raise a signal for the main
thread to continue.

This will be required once schedulers can be added and removed from the
running kernel.
This commit is contained in:
Brian Anderson
2012-02-04 14:54:10 -08:00
parent 6eafe5d772
commit f39e64d56a
5 changed files with 58 additions and 11 deletions
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19
src/rt/rust_scheduler.cpp
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@@ -7,6 +7,7 @@ rust_scheduler::rust_scheduler(rust_kernel *kernel,
kernel(kernel),
srv(srv),
env(srv->env),
live_threads(num_threads),
num_threads(num_threads)
{
isaac_init(kernel, &rctx);
@@ -59,11 +60,6 @@ rust_scheduler::start_task_threads()
rust_task_thread *thread = threads[i];
thread->start();
}
for(size_t i = 0; i < num_threads; ++i) {
rust_task_thread *thread = threads[i];
thread->join();
}
}
void
@@ -102,3 +98,16 @@ size_t
rust_scheduler::number_of_threads() {
return num_threads;
}
void
rust_scheduler::release_task_thread() {
I(this, !lock.lock_held_by_current_thread());
uintptr_t new_live_threads;
{
scoped_lock with(lock);
new_live_threads = --live_threads;
}
if (new_live_threads == 0) {
kernel->release_scheduler();
}
}