221 lines
8.8 KiB
C++
221 lines
8.8 KiB
C++
/*
|
|
* 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_RUNTIME_THREAD_LIST_H_
|
|
#define ART_RUNTIME_THREAD_LIST_H_
|
|
|
|
#include "base/histogram.h"
|
|
#include "base/mutex.h"
|
|
#include "base/value_object.h"
|
|
#include "gc_root.h"
|
|
#include "jni.h"
|
|
#include "object_callbacks.h"
|
|
|
|
#include <bitset>
|
|
#include <list>
|
|
|
|
namespace art {
|
|
namespace gc {
|
|
namespace collector {
|
|
class GarbageCollector;
|
|
} // namespac collector
|
|
} // namespace gc
|
|
class Closure;
|
|
class Thread;
|
|
class TimingLogger;
|
|
|
|
class ThreadList {
|
|
public:
|
|
static const uint32_t kMaxThreadId = 0xFFFF;
|
|
static const uint32_t kInvalidThreadId = 0;
|
|
static const uint32_t kMainThreadId = 1;
|
|
|
|
explicit ThreadList();
|
|
~ThreadList();
|
|
|
|
void DumpForSigQuit(std::ostream& os)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::mutator_lock_);
|
|
// For thread suspend timeout dumps.
|
|
void Dump(std::ostream& os, bool dump_native_stack = true)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
pid_t GetLockOwner(); // For SignalCatcher.
|
|
|
|
// Thread suspension support.
|
|
void ResumeAll()
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_)
|
|
UNLOCK_FUNCTION(Locks::mutator_lock_);
|
|
void Resume(Thread* thread, bool for_debugger = false)
|
|
REQUIRES(!Locks::thread_suspend_count_lock_);
|
|
|
|
// Suspends all threads and gets exclusive access to the mutator_lock_.
|
|
// If long_suspend is true, then other threads who try to suspend will never timeout.
|
|
// long_suspend is currenly used for hprof since large heaps take a long time.
|
|
void SuspendAll(const char* cause, bool long_suspend = false)
|
|
EXCLUSIVE_LOCK_FUNCTION(Locks::mutator_lock_)
|
|
REQUIRES(!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_,
|
|
!Locks::mutator_lock_);
|
|
|
|
// Suspend a thread using a peer, typically used by the debugger. Returns the thread on success,
|
|
// else null. The peer is used to identify the thread to avoid races with the thread terminating.
|
|
// If the thread should be suspended then value of request_suspension should be true otherwise
|
|
// the routine will wait for a previous suspend request. If the suspension times out then *timeout
|
|
// is set to true.
|
|
Thread* SuspendThreadByPeer(jobject peer, bool request_suspension, bool debug_suspension,
|
|
bool* timed_out)
|
|
REQUIRES(!Locks::mutator_lock_,
|
|
!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_);
|
|
|
|
// Suspend a thread using its thread id, typically used by lock/monitor inflation. Returns the
|
|
// thread on success else null. The thread id is used to identify the thread to avoid races with
|
|
// the thread terminating. Note that as thread ids are recycled this may not suspend the expected
|
|
// thread, that may be terminating. If the suspension times out then *timeout is set to true.
|
|
Thread* SuspendThreadByThreadId(uint32_t thread_id, bool debug_suspension, bool* timed_out)
|
|
REQUIRES(!Locks::mutator_lock_,
|
|
!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_);
|
|
|
|
// Find an existing thread (or self) by its thread id (not tid).
|
|
Thread* FindThreadByThreadId(uint32_t thread_id) REQUIRES(Locks::thread_list_lock_);
|
|
|
|
// Run a checkpoint on threads, running threads are not suspended but run the checkpoint inside
|
|
// of the suspend check. Returns how many checkpoints that are expected to run, including for
|
|
// already suspended threads for b/24191051.
|
|
size_t RunCheckpoint(Closure* checkpoint_function)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
size_t RunCheckpointOnRunnableThreads(Closure* checkpoint_function)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
// Flip thread roots from from-space refs to to-space refs. Used by
|
|
// the concurrent copying collector.
|
|
size_t FlipThreadRoots(Closure* thread_flip_visitor,
|
|
Closure* flip_callback,
|
|
gc::collector::GarbageCollector* collector)
|
|
REQUIRES(!Locks::mutator_lock_,
|
|
!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_);
|
|
|
|
// Suspends all threads
|
|
void SuspendAllForDebugger()
|
|
REQUIRES(!Locks::mutator_lock_,
|
|
!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_);
|
|
|
|
void SuspendSelfForDebugger()
|
|
REQUIRES(!Locks::thread_suspend_count_lock_);
|
|
|
|
// Resume all threads
|
|
void ResumeAllForDebugger()
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
void UndoDebuggerSuspensions()
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
// Iterates over all the threads.
|
|
void ForEach(void (*callback)(Thread*, void*), void* context)
|
|
REQUIRES(Locks::thread_list_lock_);
|
|
|
|
// Add/remove current thread from list.
|
|
void Register(Thread* self)
|
|
REQUIRES(Locks::runtime_shutdown_lock_)
|
|
REQUIRES(!Locks::mutator_lock_,
|
|
!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_);
|
|
void Unregister(Thread* self)
|
|
REQUIRES(!Locks::mutator_lock_,
|
|
!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_);
|
|
|
|
void VisitRoots(RootVisitor* visitor) const
|
|
SHARED_REQUIRES(Locks::mutator_lock_);
|
|
|
|
// Return a copy of the thread list.
|
|
std::list<Thread*> GetList() REQUIRES(Locks::thread_list_lock_) {
|
|
return list_;
|
|
}
|
|
|
|
void DumpNativeStacks(std::ostream& os)
|
|
REQUIRES(!Locks::thread_list_lock_);
|
|
|
|
private:
|
|
uint32_t AllocThreadId(Thread* self);
|
|
void ReleaseThreadId(Thread* self, uint32_t id) REQUIRES(!Locks::allocated_thread_ids_lock_);
|
|
|
|
bool Contains(Thread* thread) REQUIRES(Locks::thread_list_lock_);
|
|
bool Contains(pid_t tid) REQUIRES(Locks::thread_list_lock_);
|
|
size_t RunCheckpoint(Closure* checkpoint_function, bool includeSuspended)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
void DumpUnattachedThreads(std::ostream& os, bool dump_native_stack)
|
|
REQUIRES(!Locks::thread_list_lock_);
|
|
|
|
void SuspendAllDaemonThreadsForShutdown()
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
void WaitForOtherNonDaemonThreadsToExit()
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
void SuspendAllInternal(Thread* self,
|
|
Thread* ignore1,
|
|
Thread* ignore2 = nullptr,
|
|
bool debug_suspend = false)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
void AssertThreadsAreSuspended(Thread* self, Thread* ignore1, Thread* ignore2 = nullptr)
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_);
|
|
|
|
std::bitset<kMaxThreadId> allocated_ids_ GUARDED_BY(Locks::allocated_thread_ids_lock_);
|
|
|
|
// The actual list of all threads.
|
|
std::list<Thread*> list_ GUARDED_BY(Locks::thread_list_lock_);
|
|
|
|
// Ongoing suspend all requests, used to ensure threads added to list_ respect SuspendAll.
|
|
int suspend_all_count_ GUARDED_BY(Locks::thread_suspend_count_lock_);
|
|
int debug_suspend_all_count_ GUARDED_BY(Locks::thread_suspend_count_lock_);
|
|
|
|
// Number of threads unregistering, ~ThreadList blocks until this hits 0.
|
|
int unregistering_count_ GUARDED_BY(Locks::thread_list_lock_);
|
|
|
|
// Thread suspend time histogram. Only modified when all the threads are suspended, so guarding
|
|
// by mutator lock ensures no thread can read when another thread is modifying it.
|
|
Histogram<uint64_t> suspend_all_historam_ GUARDED_BY(Locks::mutator_lock_);
|
|
|
|
// Whether or not the current thread suspension is long.
|
|
bool long_suspend_;
|
|
|
|
friend class Thread;
|
|
|
|
DISALLOW_COPY_AND_ASSIGN(ThreadList);
|
|
};
|
|
|
|
// Helper for suspending all threads and
|
|
class ScopedSuspendAll : public ValueObject {
|
|
public:
|
|
ScopedSuspendAll(const char* cause, bool long_suspend = false)
|
|
EXCLUSIVE_LOCK_FUNCTION(Locks::mutator_lock_)
|
|
REQUIRES(!Locks::thread_list_lock_,
|
|
!Locks::thread_suspend_count_lock_,
|
|
!Locks::mutator_lock_);
|
|
// No REQUIRES(mutator_lock_) since the unlock function already asserts this.
|
|
~ScopedSuspendAll()
|
|
REQUIRES(!Locks::thread_list_lock_, !Locks::thread_suspend_count_lock_)
|
|
UNLOCK_FUNCTION(Locks::mutator_lock_);
|
|
};
|
|
|
|
} // namespace art
|
|
|
|
#endif // ART_RUNTIME_THREAD_LIST_H_
|