1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/security/sandbox/chromium/base/threading/thread_local_storage.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,93 @@
1.4 +// Copyright (c) 2012 The Chromium Authors. All rights reserved.
1.5 +// Use of this source code is governed by a BSD-style license that can be
1.6 +// found in the LICENSE file.
1.7 +
1.8 +#ifndef BASE_THREADING_THREAD_LOCAL_STORAGE_H_
1.9 +#define BASE_THREADING_THREAD_LOCAL_STORAGE_H_
1.10 +
1.11 +#include "base/base_export.h"
1.12 +#include "base/basictypes.h"
1.13 +
1.14 +#if defined(OS_POSIX)
1.15 +#include <pthread.h>
1.16 +#endif
1.17 +
1.18 +namespace base {
1.19 +
1.20 +// Wrapper for thread local storage. This class doesn't do much except provide
1.21 +// an API for portability.
1.22 +class BASE_EXPORT ThreadLocalStorage {
1.23 + public:
1.24 +
1.25 + // Prototype for the TLS destructor function, which can be optionally used to
1.26 + // cleanup thread local storage on thread exit. 'value' is the data that is
1.27 + // stored in thread local storage.
1.28 + typedef void (*TLSDestructorFunc)(void* value);
1.29 +
1.30 + // StaticSlot uses its own struct initializer-list style static
1.31 + // initialization, as base's LINKER_INITIALIZED requires a constructor and on
1.32 + // some compilers (notably gcc 4.4) this still ends up needing runtime
1.33 + // initialization.
1.34 + #define TLS_INITIALIZER {0}
1.35 +
1.36 + // A key representing one value stored in TLS.
1.37 + // Initialize like
1.38 + // ThreadLocalStorage::StaticSlot my_slot = TLS_INITIALIZER;
1.39 + // If you're not using a static variable, use the convenience class
1.40 + // ThreadLocalStorage::Slot (below) instead.
1.41 + struct BASE_EXPORT StaticSlot {
1.42 + // Set up the TLS slot. Called by the constructor.
1.43 + // 'destructor' is a pointer to a function to perform per-thread cleanup of
1.44 + // this object. If set to NULL, no cleanup is done for this TLS slot.
1.45 + // Returns false on error.
1.46 + bool Initialize(TLSDestructorFunc destructor);
1.47 +
1.48 + // Free a previously allocated TLS 'slot'.
1.49 + // If a destructor was set for this slot, removes
1.50 + // the destructor so that remaining threads exiting
1.51 + // will not free data.
1.52 + void Free();
1.53 +
1.54 + // Get the thread-local value stored in slot 'slot'.
1.55 + // Values are guaranteed to initially be zero.
1.56 + void* Get() const;
1.57 +
1.58 + // Set the thread-local value stored in slot 'slot' to
1.59 + // value 'value'.
1.60 + void Set(void* value);
1.61 +
1.62 + bool initialized() const { return initialized_; }
1.63 +
1.64 + // The internals of this struct should be considered private.
1.65 + bool initialized_;
1.66 +#if defined(OS_WIN)
1.67 + int slot_;
1.68 +#elif defined(OS_POSIX)
1.69 + pthread_key_t key_;
1.70 +#endif
1.71 +
1.72 + };
1.73 +
1.74 + // A convenience wrapper around StaticSlot with a constructor. Can be used
1.75 + // as a member variable.
1.76 + class BASE_EXPORT Slot : public StaticSlot {
1.77 + public:
1.78 + // Calls StaticSlot::Initialize().
1.79 + explicit Slot(TLSDestructorFunc destructor = NULL);
1.80 +
1.81 + private:
1.82 + using StaticSlot::initialized_;
1.83 +#if defined(OS_WIN)
1.84 + using StaticSlot::slot_;
1.85 +#elif defined(OS_POSIX)
1.86 + using StaticSlot::key_;
1.87 +#endif
1.88 + DISALLOW_COPY_AND_ASSIGN(Slot);
1.89 + };
1.90 +
1.91 + DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorage);
1.92 +};
1.93 +
1.94 +} // namespace base
1.95 +
1.96 +#endif // BASE_THREADING_THREAD_LOCAL_STORAGE_H_
