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0a262ba7c3
These patches make threading optional in LLVM. The configuration scripts are now modified to accept a --disable-threads switch. If this is used, the Mutex class will be implemented with all functions as no-op. Furthermore, linking against libpthread will not be done. Finally, the ParallelJIT example needs libpthread so its makefile was changed to always add -lpthread to the link line. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23003 91177308-0d34-0410-b5e6-96231b3b80d8
85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//===- llvm/System/Mutex.h - Mutex Operating System Concept -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the llvm::sys::Mutex class.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SYSTEM_MUTEX_H
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#define LLVM_SYSTEM_MUTEX_H
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namespace llvm
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{
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namespace sys
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{
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/// @brief Platform agnostic Mutex class.
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class Mutex
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{
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/// @name Constructors
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/// @{
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public:
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/// Initializes the lock but doesn't acquire it. if \p recursive is set
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/// to false, the lock will not be recursive which makes it cheaper but
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/// also more likely to deadlock (same thread can't acquire more than
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/// once).
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/// @brief Default Constructor.
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Mutex ( bool recursive = true );
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/// Releases and removes the lock
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/// @brief Destructor
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~Mutex ( void );
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/// @}
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/// @name Methods
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/// @{
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public:
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/// Attempts to unconditionally acquire the lock. If the lock is held by
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/// another thread, this method will wait until it can acquire the lock.
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/// @returns false if any kind of error occurs, true otherwise.
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/// @brief Unconditionally acquire the lock.
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bool acquire();
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/// Attempts to release the lock. If the lock is held by the current
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/// thread, the lock is released allowing other threads to acquire the
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/// lock.
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/// @returns false if any kind of error occurs, true otherwise.
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/// @brief Unconditionally release the lock.
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bool release(void);
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/// Attempts to acquire the lock without blocking. If the lock is not
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/// available, this function returns false quickly (without blocking). If
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/// the lock is available, it is acquired.
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/// @returns false if any kind of error occurs or the lock is not
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/// available, true otherwise.
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/// @brief Try to acquire the lock.
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bool tryacquire();
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//@}
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/// @name Platform Dependent Data
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/// @{
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private:
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#ifdef ENABLE_THREADS
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void* data_; ///< We don't know what the data will be
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#endif
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/// @}
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/// @name Do Not Implement
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/// @{
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private:
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Mutex(const Mutex & original);
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void operator=(const Mutex &);
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/// @}
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};
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}
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}
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#endif
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