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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MOJO_SHELL_RUNNER_HOST_MACH_BROKER_H_
#define MOJO_SHELL_RUNNER_HOST_MACH_BROKER_H_
#include "base/mac/mach_port_broker.h"
namespace base {
template <typename T> struct DefaultSingletonTraits;
}
namespace mojo {
namespace shell {
// A global singleton |MachBroker| is used by the shell to provide access to
// Mach task ports for shell out-of-process applications.
class MachBroker {
public:
// Sends the task port of the current process to the parent over Mach IPC.
// For use in child processes.
static void SendTaskPortToParent();
// Returns the global |MachBroker|. For use in the shell.
static MachBroker* GetInstance();
// Registers |pid| with a MACH_PORT_NULL task port in the port provider. A
// child's pid must be registered before the broker will accept a task port
// from that child.
// Callers MUST acquire the lock given by GetLock() before calling this method
// (and release the lock afterwards).
void ExpectPid(base::ProcessHandle pid);
// Removes |pid| from the port provider.
// Callers MUST acquire the lock given by GetLock() before calling this method
// (and release the lock afterwards).
void RemovePid(base::ProcessHandle pid);
base::Lock& GetLock() { return broker_.GetLock(); }
base::PortProvider* port_provider() { return &broker_; }
private:
MachBroker();
~MachBroker();
friend struct base::DefaultSingletonTraits<MachBroker>;
base::MachPortBroker broker_;
};
} // namespace shell
} // namespace mojo
#endif // MOJO_SHELL_RUNNER_HOST_MACH_BROKER_H_
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