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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_SRC_THREAD_LIST_H_
#define ART_SRC_THREAD_LIST_H_
#include "mutex.h"
#include "thread.h"
namespace art {
class ThreadList {
public:
static const uint32_t kMaxThreadId = 0xFFFF;
static const uint32_t kInvalidId = 0;
static const uint32_t kMainId = 1;
explicit ThreadList();
~ThreadList();
void DumpForSigQuit(std::ostream& os);
void DumpLocked(std::ostream& os); // For thread suspend timeout dumps.
pid_t GetLockOwner(); // For SignalCatcher.
// Thread suspension support.
void FullSuspendCheck(Thread* thread);
void ResumeAll(bool for_debugger = false);
void Resume(Thread* thread, bool for_debugger = false);
void RunWhileSuspended(Thread* thread, void (*callback)(void*), void* arg); // NOLINT
void SuspendAll(bool for_debugger = false);
void SuspendSelfForDebugger();
void Suspend(Thread* thread, bool for_debugger = false);
void UndoDebuggerSuspensions();
// Iterates over all the threads. The caller must hold the thread list lock.
void ForEach(void (*callback)(Thread*, void*), void* context);
void Register();
void Unregister();
void VisitRoots(Heap::RootVisitor* visitor, void* arg) const;
// Handshaking for new thread creation.
void SignalGo(Thread* child);
void WaitForGo();
private:
typedef std::list<Thread*>::const_iterator It; // TODO: C++0x auto
uint32_t AllocThreadId();
void ReleaseThreadId(uint32_t id);
bool Contains(Thread* thread);
bool AllOtherThreadsAreDaemons();
void SuspendAllDaemonThreads();
void WaitForOtherNonDaemonThreadsToExit();
static void ModifySuspendCount(Thread* thread, int delta, bool for_debugger);
mutable Mutex allocated_ids_lock_;
std::bitset<kMaxThreadId> allocated_ids_;
mutable Mutex thread_list_lock_;
std::list<Thread*> list_;
ConditionVariable thread_start_cond_;
ConditionVariable thread_exit_cond_;
// This lock guards every thread's suspend_count_ field...
mutable Mutex thread_suspend_count_lock_;
// ...and is used in conjunction with this condition variable.
ConditionVariable thread_suspend_count_cond_;
friend class Thread;
friend class ScopedThreadListLock;
DISALLOW_COPY_AND_ASSIGN(ThreadList);
};
} // namespace art
#endif // ART_SRC_THREAD_LIST_H_