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rt: Take the task lock when dropping port refcounts

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Sucks, but otherwise there are races when one task drops the refcount to zero
followed by another bumping it again
This commit is contained in:
Brian Anderson
2011-11-11 15:34:35 -08:00
parent 07771ec25b
commit 3d9023fa4d
4 changed files with 20 additions and 26 deletions
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4
src/rt/rust_builtin.cpp
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@@ -471,6 +471,7 @@ extern "C" CDECL void
del_port(rust_port *port) {
rust_task *task = rust_scheduler::get_task();
LOG(task, comm, "del_port(0x%" PRIxPTR ")", (uintptr_t) port);
scoped_lock with(task->lock);
port->deref();
}
@@ -487,11 +488,12 @@ chan_id_send(type_desc *t, rust_task_id target_task_id,
rust_task *target_task = task->kernel->get_task_by_id(target_task_id);
if(target_task) {
rust_port *port = target_task->get_port_by_id(target_port_id);
target_task->deref();
if(port) {
port->send(sptr);
scoped_lock with(target_task->lock);
port->deref();
}
target_task->deref();
}
}