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// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
#include "rust_globals.h"
#include "rust_sched_driver.h"
#include "rust_sched_loop.h"
rust_sched_driver::rust_sched_driver(rust_sched_loop *sched_loop)
: sched_loop(sched_loop),
signalled(false) {
assert(sched_loop != NULL);
sched_loop->on_pump_loop(this);
}
/**
* Starts the main scheduler loop which performs task scheduling for this
* domain.
*
* Returns once no more tasks can be scheduled and all task ref_counts
* drop to zero.
*/
void
rust_sched_driver::start_main_loop() {
assert(sched_loop != NULL);
#ifdef __APPLE__
{
char buf[64];
snprintf(buf, sizeof(buf), "scheduler loop %d", sched_loop->get_id());
// pthread_setname_np seems to have a different signature and
// different behavior on different platforms. Thus, this is
// only for Mac at the moment. There are equivalent versions
// for Linux that we can add if needed.
pthread_setname_np(buf);
}
#endif
rust_sched_loop_state state = sched_loop_state_keep_going;
while (state != sched_loop_state_exit) {
DLOG(sched_loop, dom, "pumping scheduler");
state = sched_loop->run_single_turn();
if (state == sched_loop_state_block) {
scoped_lock with(lock);
if (!signalled) {
DLOG(sched_loop, dom, "blocking scheduler");
lock.wait();
}
signalled = false;
}
}
}
void
rust_sched_driver::signal() {
scoped_lock with(lock);
signalled = true;
lock.signal();
}
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