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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
//===-- scudo_tsd_exclusive.cpp ---------------------------------*- C++ -*-===//
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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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/// Scudo exclusive TSD implementation.
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///
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//===----------------------------------------------------------------------===//
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#include "scudo_tsd.h"
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#if SCUDO_TSD_EXCLUSIVE
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namespace __scudo {
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static pthread_once_t GlobalInitialized = PTHREAD_ONCE_INIT;
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static pthread_key_t PThreadKey;
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__attribute__((tls_model("initial-exec")))
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THREADLOCAL ThreadState ScudoThreadState = ThreadNotInitialized;
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__attribute__((tls_model("initial-exec")))
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THREADLOCAL ScudoTSD TSD;
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// Fallback TSD for when the thread isn't initialized yet or is torn down. It
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// can be shared between multiple threads and as such must be locked.
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ScudoTSD FallbackTSD;
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static void teardownThread(void *Ptr) {
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uptr I = reinterpret_cast<uptr>(Ptr);
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// The glibc POSIX thread-local-storage deallocation routine calls user
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// provided destructors in a loop of PTHREAD_DESTRUCTOR_ITERATIONS.
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// We want to be called last since other destructors might call free and the
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// like, so we wait until PTHREAD_DESTRUCTOR_ITERATIONS before draining the
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// quarantine and swallowing the cache.
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if (I > 1) {
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// If pthread_setspecific fails, we will go ahead with the teardown.
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if (LIKELY(pthread_setspecific(PThreadKey,
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reinterpret_cast<void *>(I - 1)) == 0))
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return;
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}
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TSD.commitBack();
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ScudoThreadState = ThreadTornDown;
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}
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static void initOnce() {
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CHECK_EQ(pthread_key_create(&PThreadKey, teardownThread), 0);
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initScudo();
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FallbackTSD.init();
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}
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void initThread(bool MinimalInit) {
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CHECK_EQ(pthread_once(&GlobalInitialized, initOnce), 0);
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if (UNLIKELY(MinimalInit))
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return;
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CHECK_EQ(pthread_setspecific(PThreadKey, reinterpret_cast<void *>(
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GetPthreadDestructorIterations())), 0);
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TSD.init();
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ScudoThreadState = ThreadInitialized;
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}
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} // namespace __scudo
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#endif // SCUDO_TSD_EXCLUSIVE
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