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author | Owen Anderson <resistor@mac.com> | 2009-06-16 20:19:28 +0000 |
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committer | Owen Anderson <resistor@mac.com> | 2009-06-16 20:19:28 +0000 |
commit | 2a8cf9aadd39e507e6e09c25530a2f01ca27fe57 (patch) | |
tree | 2d21b27491e24b1fcd0f8510e0e9ccaff40c1ea4 /include/llvm/System | |
parent | 1555a23335400143f2b54a66aedc4b5cbbb79f8d (diff) | |
download | llvm-2a8cf9aadd39e507e6e09c25530a2f01ca27fe57.tar.gz llvm-2a8cf9aadd39e507e6e09c25530a2f01ca27fe57.tar.bz2 llvm-2a8cf9aadd39e507e6e09c25530a2f01ca27fe57.tar.xz |
Add a portable wrapper for reader-writer locks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73545 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include/llvm/System')
-rw-r--r-- | include/llvm/System/RWMutex.h | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/include/llvm/System/RWMutex.h b/include/llvm/System/RWMutex.h new file mode 100644 index 0000000000..eb56eec75f --- /dev/null +++ b/include/llvm/System/RWMutex.h @@ -0,0 +1,84 @@ +//===- RWMutex.h - Reader/Writer Mutual Exclusion Lock ----------*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file declares the llvm::sys::RWMutex class. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_SYSTEM_MUTEX_H +#define LLVM_SYSTEM_MUTEX_H + +namespace llvm +{ + namespace sys + { + /// @brief Platform agnostic Mutex class. + class RWMutex + { + /// @name Constructors + /// @{ + public: + + /// Initializes the lock but doesn't acquire it. + /// @brief Default Constructor. + explicit RWMutex(); + + /// Releases and removes the lock + /// @brief Destructor + ~RWMutex(); + + /// @} + /// @name Methods + /// @{ + public: + + /// Attempts to unconditionally acquire the lock in reader mode. If the + /// lock is held by a writer, this method will wait until it can acquire + /// the lock. + /// @returns false if any kind of error occurs, true otherwise. + /// @brief Unconditionally acquire the lock in reader mode. + bool reader_acquire(); + + /// Attempts to release the lock in reader mode. + /// @returns false if any kind of error occurs, true otherwise. + /// @brief Unconditionally release the lock in reader mode. + bool reader_release(); + + /// Attempts to unconditionally acquire the lock in reader mode. If the + /// lock is held by any readers, this method will wait until it can + /// acquire the lock. + /// @returns false if any kind of error occurs, true otherwise. + /// @brief Unconditionally acquire the lock in writer mode. + bool writer_acquire(); + + /// Attempts to release the lock in writer mode. + /// @returns false if any kind of error occurs, true otherwise. + /// @brief Unconditionally release the lock in write mode. + bool writer_release(); + + //@} + /// @name Platform Dependent Data + /// @{ + private: +#ifdef ENABLE_THREADS + void* data_; ///< We don't know what the data will be +#endif + + /// @} + /// @name Do Not Implement + /// @{ + private: + RWMutex(const RWMutex & original); + void operator=(const RWMutex &); + /// @} + }; + } +} + +#endif |