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rt: Only wake up all schedulers when no tasks are left

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At the moment there's not really any reason to be raising this signal,
since they schedulers wake up periodically anyway, but once we remove
the timer this will be how the schedulers know to exit.
This commit is contained in:
Brian Anderson
2012-02-02 17:02:50 -08:00
parent 5c3c8d454d
commit aee83d2ff1
4 changed files with 25 additions and 9 deletions
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21
src/rt/rust_scheduler.cpp
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@@ -32,7 +32,8 @@ rust_scheduler::rust_scheduler(rust_kernel *kernel,
kernel(kernel),
id(id),
min_stack_size(kernel->env->min_stack_size),
env(kernel->env)
env(kernel->env),
should_exit(false)
{
LOGPTR(this, "new dom", (uintptr_t)this);
isaac_init(this, &rctx);
@@ -160,8 +161,12 @@ rust_scheduler::reap_dead_tasks(int id) {
rust_task *task = dead_tasks_copy[i];
if (task) {
task->deref();
sync::decrement(kernel->live_tasks);
kernel->wakeup_schedulers();
int live_tasks = sync::decrement(kernel->live_tasks);
if (live_tasks == 0) {
// There are no more tasks and there never will be.
// Tell all the schedulers to exit.
kernel->exit_schedulers();
}
}
}
srv->free(dead_tasks_copy);
@@ -236,7 +241,7 @@ rust_scheduler::start_main_loop() {
DLOG(this, dom, "started domain loop %d", id);
while (kernel->live_tasks > 0) {
while (!should_exit) {
A(this, kernel->is_deadlocked() == false, "deadlock");
DLOG(this, dom, "worker %d, number_of_live_tasks = %d, total = %d",
@@ -375,6 +380,14 @@ rust_scheduler::get_task() {
}
#endif
void
rust_scheduler::exit() {
A(this, !lock.lock_held_by_current_thread(), "Shouldn't have lock");
scoped_lock with(lock);
should_exit = true;
lock.signal_all();
}
//
// Local Variables:
// mode: C++