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comparison: ipc/chromium/src/base/thread_local_storage.h
ipc/chromium/src/base/thread_local_storage.h
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| 1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #ifndef BASE_THREAD_LOCAL_STORAGE_H_ | |
| 6 #define BASE_THREAD_LOCAL_STORAGE_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 | |
| 10 #if defined(OS_POSIX) | |
| 11 #include <pthread.h> | |
| 12 #endif | |
| 13 | |
| 14 // Wrapper for thread local storage. This class doesn't do much except provide | |
| 15 // an API for portability. | |
| 16 class ThreadLocalStorage { | |
| 17 public: | |
| 18 | |
| 19 // Prototype for the TLS destructor function, which can be optionally used to | |
| 20 // cleanup thread local storage on thread exit. 'value' is the data that is | |
| 21 // stored in thread local storage. | |
| 22 typedef void (*TLSDestructorFunc)(void* value); | |
| 23 | |
| 24 // A key representing one value stored in TLS. | |
| 25 class Slot { | |
| 26 public: | |
| 27 Slot(TLSDestructorFunc destructor = NULL); | |
| 28 | |
| 29 // This constructor should be used for statics. | |
| 30 // It returns an uninitialized Slot. | |
| 31 explicit Slot(base::LinkerInitialized x) {} | |
| 32 | |
| 33 // Set up the TLS slot. Called by the constructor. | |
| 34 // 'destructor' is a pointer to a function to perform per-thread cleanup of | |
| 35 // this object. If set to NULL, no cleanup is done for this TLS slot. | |
| 36 // Returns false on error. | |
| 37 bool Initialize(TLSDestructorFunc destructor); | |
| 38 | |
| 39 // Free a previously allocated TLS 'slot'. | |
| 40 // If a destructor was set for this slot, removes | |
| 41 // the destructor so that remaining threads exiting | |
| 42 // will not free data. | |
| 43 void Free(); | |
| 44 | |
| 45 // Get the thread-local value stored in slot 'slot'. | |
| 46 // Values are guaranteed to initially be zero. | |
| 47 void* Get() const; | |
| 48 | |
| 49 // Set the thread-local value stored in slot 'slot' to | |
| 50 // value 'value'. | |
| 51 void Set(void* value); | |
| 52 | |
| 53 bool initialized() const { return initialized_; } | |
| 54 | |
| 55 private: | |
| 56 // The internals of this struct should be considered private. | |
| 57 bool initialized_; | |
| 58 #if defined(OS_WIN) | |
| 59 int slot_; | |
| 60 #elif defined(OS_POSIX) | |
| 61 pthread_key_t key_; | |
| 62 #endif | |
| 63 | |
| 64 DISALLOW_COPY_AND_ASSIGN(Slot); | |
| 65 }; | |
| 66 | |
| 67 #if defined(OS_WIN) | |
| 68 // Function called when on thread exit to call TLS | |
| 69 // destructor functions. This function is used internally. | |
| 70 static void ThreadExit(); | |
| 71 | |
| 72 private: | |
| 73 // Function to lazily initialize our thread local storage. | |
| 74 static void **Initialize(); | |
| 75 | |
| 76 private: | |
| 77 // The maximum number of 'slots' in our thread local storage stack. | |
| 78 // For now, this is fixed. We could either increase statically, or | |
| 79 // we could make it dynamic in the future. | |
| 80 static const int kThreadLocalStorageSize = 64; | |
| 81 | |
| 82 static long tls_key_; | |
| 83 static long tls_max_; | |
| 84 static TLSDestructorFunc tls_destructors_[kThreadLocalStorageSize]; | |
| 85 #endif // OS_WIN | |
| 86 | |
| 87 DISALLOW_COPY_AND_ASSIGN(ThreadLocalStorage); | |
| 88 }; | |
| 89 | |
| 90 // Temporary backwards-compatible name. | |
| 91 // TODO(evanm): replace all usage of TLSSlot. | |
| 92 typedef ThreadLocalStorage::Slot TLSSlot; | |
| 93 | |
| 94 #endif // BASE_THREAD_LOCAL_STORAGE_H_ |
