1 //===-- scudo_tls_linux.cpp -------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// Scudo thread local structure implementation for platforms supporting
13 //===----------------------------------------------------------------------===//
15 #include "sanitizer_common/sanitizer_platform.h"
17 #if SANITIZER_LINUX && !SANITIZER_ANDROID
19 #include "scudo_tls.h"
25 static pthread_once_t GlobalInitialized = PTHREAD_ONCE_INIT;
26 static pthread_key_t PThreadKey;
28 __attribute__((tls_model("initial-exec")))
29 THREADLOCAL ThreadState ScudoThreadState = ThreadNotInitialized;
30 __attribute__((tls_model("initial-exec")))
31 THREADLOCAL ScudoThreadContext ThreadLocalContext;
33 static void teardownThread(void *Ptr) {
34 uptr I = reinterpret_cast<uptr>(Ptr);
35 // The glibc POSIX thread-local-storage deallocation routine calls user
36 // provided destructors in a loop of PTHREAD_DESTRUCTOR_ITERATIONS.
37 // We want to be called last since other destructors might call free and the
38 // like, so we wait until PTHREAD_DESTRUCTOR_ITERATIONS before draining the
39 // quarantine and swallowing the cache.
41 // If pthread_setspecific fails, we will go ahead with the teardown.
42 if (LIKELY(pthread_setspecific(PThreadKey,
43 reinterpret_cast<void *>(I - 1)) == 0))
46 ThreadLocalContext.commitBack();
47 ScudoThreadState = ThreadTornDown;
51 static void initOnce() {
52 CHECK_EQ(pthread_key_create(&PThreadKey, teardownThread), 0);
57 CHECK_EQ(pthread_once(&GlobalInitialized, initOnce), 0);
58 CHECK_EQ(pthread_setspecific(PThreadKey, reinterpret_cast<void *>(
59 GetPthreadDestructorIterations())), 0);
60 ThreadLocalContext.init();
61 ScudoThreadState = ThreadInitialized;
64 } // namespace __scudo
66 #endif // SANITIZER_LINUX && !SANITIZER_ANDROID