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7760272778
Comment "No lock needed" in CurrentThreadContext was wrong. Concurent ThreadRegistry::CreateThread can resize and relocate ThreadRegistry::threads_ the same time CurrentThreadContext reads it. To mitigate lock cost we store ThreadContext* instead of tid in THREADLOCAL cache, we can tid from the ThreadContext*. Reviewed By: kstoimenov, MaskRay Differential Revision: https://reviews.llvm.org/D148281
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
//=-- lsan_thread.cpp -----------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of LeakSanitizer.
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// See lsan_thread.h for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lsan_thread.h"
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#include "lsan.h"
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#include "lsan_allocator.h"
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#include "lsan_common.h"
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_placement_new.h"
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#include "sanitizer_common/sanitizer_thread_registry.h"
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#include "sanitizer_common/sanitizer_tls_get_addr.h"
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namespace __lsan {
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static ThreadRegistry *thread_registry;
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static ThreadContextBase *CreateThreadContext(u32 tid) {
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void *mem = MmapOrDie(sizeof(ThreadContext), "ThreadContext");
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return new (mem) ThreadContext(tid);
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}
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void InitializeThreadRegistry() {
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static ALIGNED(64) char thread_registry_placeholder[sizeof(ThreadRegistry)];
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thread_registry =
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new (thread_registry_placeholder) ThreadRegistry(CreateThreadContext);
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}
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ThreadContextLsanBase::ThreadContextLsanBase(int tid)
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: ThreadContextBase(tid) {}
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void ThreadContextLsanBase::OnStarted(void *arg) { SetCurrentThread(this); }
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void ThreadContextLsanBase::OnFinished() {
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AllocatorThreadFinish();
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DTLS_Destroy();
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SetCurrentThread(nullptr);
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}
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u32 ThreadCreate(u32 parent_tid, bool detached, void *arg) {
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return thread_registry->CreateThread(0, detached, parent_tid, arg);
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}
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void ThreadContextLsanBase::ThreadStart(u32 tid, tid_t os_id,
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ThreadType thread_type, void *arg) {
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thread_registry->StartThread(tid, os_id, thread_type, arg);
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}
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void ThreadFinish() { thread_registry->FinishThread(GetCurrentThreadId()); }
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void EnsureMainThreadIDIsCorrect() {
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if (GetCurrentThreadId() == kMainTid)
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GetCurrentThread()->os_id = GetTid();
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}
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///// Interface to the common LSan module. /////
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void GetThreadExtraStackRangesLocked(tid_t os_id,
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InternalMmapVector<Range> *ranges) {}
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void GetThreadExtraStackRangesLocked(InternalMmapVector<Range> *ranges) {}
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void LockThreadRegistry() { thread_registry->Lock(); }
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void UnlockThreadRegistry() { thread_registry->Unlock(); }
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ThreadRegistry *GetLsanThreadRegistryLocked() {
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thread_registry->CheckLocked();
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return thread_registry;
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}
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void GetRunningThreadsLocked(InternalMmapVector<tid_t> *threads) {
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GetLsanThreadRegistryLocked()->RunCallbackForEachThreadLocked(
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[](ThreadContextBase *tctx, void *threads) {
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if (tctx->status == ThreadStatusRunning) {
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reinterpret_cast<InternalMmapVector<tid_t> *>(threads)->push_back(
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tctx->os_id);
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}
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},
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threads);
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}
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} // namespace __lsan
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