summaryrefslogtreecommitdiffstats
path: root/security/sandbox/chromium/base/threading/thread_local_storage.h
diff options
context:
space:
mode:
Diffstat (limited to 'security/sandbox/chromium/base/threading/thread_local_storage.h')
-rw-r--r--security/sandbox/chromium/base/threading/thread_local_storage.h148
1 files changed, 0 insertions, 148 deletions
diff --git a/security/sandbox/chromium/base/threading/thread_local_storage.h b/security/sandbox/chromium/base/threading/thread_local_storage.h
deleted file mode 100644
index 013b0aeff..000000000
--- a/security/sandbox/chromium/base/threading/thread_local_storage.h
+++ /dev/null
@@ -1,148 +0,0 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef BASE_THREADING_THREAD_LOCAL_STORAGE_H_
-#define BASE_THREADING_THREAD_LOCAL_STORAGE_H_
-
-#include "base/atomicops.h"
-#include "base/base_export.h"
-#include "base/macros.h"
-#include "build/build_config.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#elif defined(OS_POSIX)
-#include <pthread.h>
-#endif
-
-namespace base {
-
-namespace internal {
-
-// WARNING: You should *NOT* be using this class directly.
-// PlatformThreadLocalStorage is low-level abstraction to the OS's TLS
-// interface, you should instead be using ThreadLocalStorage::StaticSlot/Slot.
-class BASE_EXPORT PlatformThreadLocalStorage {
- public:
-
-#if defined(OS_WIN)
- typedef unsigned long TLSKey;
- enum : unsigned { TLS_KEY_OUT_OF_INDEXES = TLS_OUT_OF_INDEXES };
-#elif defined(OS_POSIX)
- typedef pthread_key_t TLSKey;
- // The following is a "reserved key" which is used in our generic Chromium
- // ThreadLocalStorage implementation. We expect that an OS will not return
- // such a key, but if it is returned (i.e., the OS tries to allocate it) we
- // will just request another key.
- enum { TLS_KEY_OUT_OF_INDEXES = 0x7FFFFFFF };
-#endif
-
- // The following methods need to be supported on each OS platform, so that
- // the Chromium ThreadLocalStore functionality can be constructed.
- // Chromium will use these methods to acquire a single OS slot, and then use
- // that to support a much larger number of Chromium slots (independent of the
- // OS restrictions).
- // The following returns true if it successfully is able to return an OS
- // key in |key|.
- static bool AllocTLS(TLSKey* key);
- // Note: FreeTLS() doesn't have to be called, it is fine with this leak, OS
- // might not reuse released slot, you might just reset the TLS value with
- // SetTLSValue().
- static void FreeTLS(TLSKey key);
- static void SetTLSValue(TLSKey key, void* value);
- static void* GetTLSValue(TLSKey key);
-
- // Each platform (OS implementation) is required to call this method on each
- // terminating thread when the thread is about to terminate. This method
- // will then call all registered destructors for slots in Chromium
- // ThreadLocalStorage, until there are no slot values remaining as having
- // been set on this thread.
- // Destructors may end up being called multiple times on a terminating
- // thread, as other destructors may re-set slots that were previously
- // destroyed.
-#if defined(OS_WIN)
- // Since Windows which doesn't support TLS destructor, the implementation
- // should use GetTLSValue() to retrieve the value of TLS slot.
- static void OnThreadExit();
-#elif defined(OS_POSIX)
- // |Value| is the data stored in TLS slot, The implementation can't use
- // GetTLSValue() to retrieve the value of slot as it has already been reset
- // in Posix.
- static void OnThreadExit(void* value);
-#endif
-};
-
-} // namespace internal
-
-// Wrapper for thread local storage. This class doesn't do much except provide
-// an API for portability.
-class BASE_EXPORT ThreadLocalStorage {
- public:
-
- // Prototype for the TLS destructor function, which can be optionally used to
- // cleanup thread local storage on thread exit. 'value' is the data that is
- // stored in thread local storage.
- typedef void (*TLSDestructorFunc)(void* value);
-
- // StaticSlot uses its own struct initializer-list style static
- // initialization, as base's LINKER_INITIALIZED requires a constructor and on
- // some compilers (notably gcc 4.4) this still ends up needing runtime
- // initialization.
- #define TLS_INITIALIZER {0}
-
- // A key representing one value stored in TLS.
- // Initialize like
- // ThreadLocalStorage::StaticSlot my_slot = TLS_INITIALIZER;
- // If you're not using a static variable, use the convenience class
- // ThreadLocalStorage::Slot (below) instead.
- struct BASE_EXPORT StaticSlot {
- // Set up the TLS slot. Called by the constructor.
- // 'destructor' is a pointer to a function to perform per-thread cleanup of
- // this object. If set to NULL, no cleanup is done for this TLS slot.
- void Initialize(TLSDestructorFunc destructor);
-
- // Free a previously allocated TLS 'slot'.
- // If a destructor was set for this slot, removes
- // the destructor so that remaining threads exiting
- // will not free data.
- void Free();
-
- // Get the thread-local value stored in slot 'slot'.
- // Values are guaranteed to initially be zero.
- void* Get() const;
-
- // Set the thread-local value stored in slot 'slot' to
- // value 'value'.
- void Set(void* value);
-
- bool initialized() const {
- return base::subtle::Acquire_Load(&initialized_) != 0;
- }
-
- // The internals of this struct should be considered private.
- base::subtle::Atomic32 initialized_;
- int slot_;
- };
-
- // A convenience wrapper around StaticSlot with a constructor. Can be used
- // as a member variable.
- class BASE_EXPORT Slot : public StaticSlot {
- public:
- // Calls StaticSlot::Initialize().
- explicit Slot(TLSDestructorFunc destructor = NULL);
-
- private:
- using StaticSlot::initialized_;
- using StaticSlot::slot_;
-
- DISALLOW_COPY_AND_ASSIGN(Slot);
- };
-
- private:
- DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorage);
-};
-
-} // namespace base
-
-#endif // BASE_THREADING_THREAD_LOCAL_STORAGE_H_