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//===-- scudo_tls_linux.cpp -------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// Scudo thread local structure implementation for platforms supporting
/// thread_local.
///
//===----------------------------------------------------------------------===//
#include "sanitizer_common/sanitizer_platform.h"
#if SANITIZER_LINUX && !SANITIZER_ANDROID
#include "scudo_tls.h"
#include <limits.h>
#include <pthread.h>
namespace __scudo {
static pthread_once_t GlobalInitialized = PTHREAD_ONCE_INIT;
static pthread_key_t PThreadKey;
__attribute__((tls_model("initial-exec")))
THREADLOCAL ThreadState ScudoThreadState = ThreadNotInitialized;
__attribute__((tls_model("initial-exec")))
THREADLOCAL ScudoThreadContext ThreadLocalContext;
static void teardownThread(void *Ptr) {
uptr Iteration = reinterpret_cast<uptr>(Ptr);
// The glibc POSIX thread-local-storage deallocation routine calls user
// provided destructors in a loop of PTHREAD_DESTRUCTOR_ITERATIONS.
// We want to be called last since other destructors might call free and the
// like, so we wait until PTHREAD_DESTRUCTOR_ITERATIONS before draining the
// quarantine and swallowing the cache.
if (Iteration < PTHREAD_DESTRUCTOR_ITERATIONS) {
pthread_setspecific(PThreadKey, reinterpret_cast<void *>(Iteration + 1));
return;
}
ThreadLocalContext.commitBack();
ScudoThreadState = ThreadTornDown;
}
static void initOnce() {
CHECK_EQ(pthread_key_create(&PThreadKey, teardownThread), 0);
initScudo();
}
void initThread() {
pthread_once(&GlobalInitialized, initOnce);
pthread_setspecific(PThreadKey, reinterpret_cast<void *>(1));
ThreadLocalContext.init();
ScudoThreadState = ThreadInitialized;
}
} // namespace __scudo
#endif // SANITIZER_LINUX && !SANITIZER_ANDROID
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