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rt: Introduce rust_sched_reaper

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This just moves the responsibility for joining with scheduler threads
off to a worker thread. This will be needed when we allow tasks to be
scheduled on the main thread.
This commit is contained in:
Brian Anderson
2012-03-30 13:54:37 -07:00
parent 771c1be6a6
commit 218dd08469
6 changed files with 57 additions and 7 deletions
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23
src/rt/rust_kernel.cpp
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@@ -17,6 +17,7 @@ rust_kernel::rust_kernel(rust_srv *srv) :
max_port_id(0),
rval(0),
max_sched_id(0),
sched_reaper(this),
env(srv->env)
{
}
@@ -62,6 +63,9 @@ rust_kernel::create_scheduler(size_t num_threads) {
rust_scheduler *sched;
{
scoped_lock with(sched_lock);
// If this is the first scheduler then we need to launch
// the scheduler reaper.
bool start_reaper = sched_table.empty();
id = max_sched_id++;
K(srv, id != INTPTR_MAX, "Hit the maximum scheduler id");
sched = new (this, "rust_scheduler")
@@ -69,6 +73,9 @@ rust_kernel::create_scheduler(size_t num_threads) {
bool is_new = sched_table
.insert(std::pair<rust_sched_id, rust_scheduler*>(id, sched)).second;
A(this, is_new, "Reusing a sched id?");
if (start_reaper) {
sched_reaper.start();
}
}
sched->start_task_threads();
return id;
@@ -96,12 +103,12 @@ rust_kernel::release_scheduler_id(rust_sched_id id) {
}
/*
Called on the main thread to wait for the kernel to exit. This function is
also used to join on every terminating scheduler thread, so that we can be
sure they have completely exited before the process exits. If we don't join
them then we can see valgrind errors due to un-freed pthread memory.
Called by rust_sched_reaper to join every every terminating scheduler thread,
so that we can be sure they have completely exited before the process exits.
If we don't join them then we can see valgrind errors due to un-freed pthread
memory.
*/
int
void
rust_kernel::wait_for_schedulers()
{
scoped_lock with(sched_lock);
@@ -120,6 +127,12 @@ rust_kernel::wait_for_schedulers()
sched_lock.wait();
}
}
}
/* Called on the main thread to wait for the kernel to exit */
int
rust_kernel::wait_for_exit() {
sched_reaper.join();
return rval;
}