--- /dev/null
+//===- llvm/System/Mutex.h - Mutex Operating System Concept -----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the llvm::sys::Mutex class.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_SYSTEM_MUTEX_H
+#define LLVM_SYSTEM_MUTEX_H
+
+namespace llvm
+{
+ namespace sys
+ {
+ /// @brief Platform agnostic Mutex class.
+ class Mutex
+ {
+ /// @name Constructors
+ /// @{
+ public:
+
+ /// Initializes the lock but doesn't acquire it. if \p recursive is set
+ /// to false, the lock will not be recursive which makes it cheaper but
+ /// also more likely to deadlock (same thread can't acquire more than
+ /// once).
+ /// @brief Default Constructor.
+ Mutex ( bool recursive = true );
+
+ /// Releases and removes the lock
+ /// @brief Destructor
+ ~Mutex ( void );
+
+ /// @}
+ /// @name Methods
+ /// @{
+ public:
+
+ /// Attempts to unconditionally acquire the lock. If the lock is held by
+ /// another thread, 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.
+ bool acquire();
+
+ /// Attempts to release the lock. If the lock is held by the current
+ /// thread, the lock is released allowing other threads to acquire the
+ /// lock.
+ /// @returns false if any kind of error occurs, true otherwise.
+ /// @brief Unconditionally release the lock.
+ bool release(void);
+
+ /// Attempts to acquire the lock without blocking. If the lock is not
+ /// available, this function returns false quickly (without blocking). If
+ /// the lock is available, it is acquired.
+ /// @returns false if any kind of error occurs or the lock is not
+ /// available, true otherwise.
+ /// @brief Try to acquire the lock.
+ bool tryacquire();
+
+ //@}
+ /// @name Platform Dependent Data
+ /// @{
+ private:
+ void* data_; ///< We don't know what the data will be
+
+ /// @}
+ /// @name Do Not Implement
+ /// @{
+ private:
+ Mutex(const Mutex & original);
+ void operator=(const Mutex &);
+ /// @}
+ };
+ }
+}
+
+#endif
--- /dev/null
+//===- Mutex.cpp - Mutual Exclusion Lock ------------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the llvm::sys::Mutex class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/System/Mutex.h"
+#include "llvm/Config/config.h"
+
+namespace llvm {
+using namespace sys;
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//=== independent code.
+//===----------------------------------------------------------------------===//
+
+#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
+#include <cassert>
+#include <pthread.h>
+#include <stdlib.h>
+
+// This variable is useful for situations where the pthread library has been
+// compiled with weak linkage for its interface symbols. This allows the
+// threading support to be turned off by simply not linking against -lpthread.
+// In that situation, the value of pthread_mutex_init will be 0 and
+// consequently pthread_enabled will be false. In such situations, all the
+// pthread operations become no-ops and the functions all return false. If
+// pthread_mutex_init does have an address, then mutex support is enabled.
+// Note: all LLVM tools will link against -lpthread if its available since it
+// is configured into the LIBS variable.
+// Note: this line of code generates a warning if pthread_mutex_init is not
+// declared with weak linkage. Its safe to ignore the warning.
+static const bool pthread_enabled = static_cast<bool>(pthread_mutex_init);
+
+// Construct a Mutex using pthread calls
+Mutex::Mutex( bool recursive)
+ : data_(0)
+{
+ if (pthread_enabled)
+ {
+ // Declare the pthread_mutex data structures
+ pthread_mutex_t* mutex =
+ static_cast<pthread_mutex_t*>(malloc(sizeof(pthread_mutex_t)));
+ pthread_mutexattr_t attr;
+
+ // Initialize the mutex attributes
+ int errorcode = pthread_mutexattr_init(&attr);
+ assert(errorcode == 0);
+
+ // Initialize the mutex as a recursive mutex, if requested, or normal
+ // otherwise.
+ int kind = ( recursive ? PTHREAD_MUTEX_RECURSIVE : PTHREAD_MUTEX_NORMAL );
+ errorcode = pthread_mutexattr_settype(&attr, kind);
+ assert(errorcode == 0);
+
+ // Make it a process local mutex
+ errorcode = pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_PRIVATE);
+
+ // Initialize the mutex
+ errorcode = pthread_mutex_init(mutex, &attr);
+ assert(errorcode == 0);
+
+ // Destroy the attributes
+ errorcode = pthread_mutexattr_destroy(&attr);
+ assert(errorcode == 0);
+
+ // Assign the data member
+ data_ = mutex;
+ }
+}
+
+// Destruct a Mutex
+Mutex::~Mutex()
+{
+ if (pthread_enabled)
+ {
+ pthread_mutex_t* mutex = reinterpret_cast<pthread_mutex_t*>(data_);
+ assert(mutex != 0);
+ int errorcode = pthread_mutex_destroy(mutex);
+ assert(mutex != 0);
+ }
+}
+
+bool
+Mutex::acquire()
+{
+ if (pthread_enabled)
+ {
+ pthread_mutex_t* mutex = reinterpret_cast<pthread_mutex_t*>(data_);
+ assert(mutex != 0);
+
+ int errorcode = pthread_mutex_lock(mutex);
+ return errorcode == 0;
+ }
+ return false;
+}
+
+bool
+Mutex::release()
+{
+ if (pthread_enabled)
+ {
+ pthread_mutex_t* mutex = reinterpret_cast<pthread_mutex_t*>(data_);
+ assert(mutex != 0);
+
+ int errorcode = pthread_mutex_unlock(mutex);
+ return errorcode == 0;
+ }
+ return false;
+}
+
+bool
+Mutex::tryacquire()
+{
+ if (pthread_enabled)
+ {
+ pthread_mutex_t* mutex = reinterpret_cast<pthread_mutex_t*>(data_);
+ assert(mutex != 0);
+
+ int errorcode = pthread_mutex_trylock(mutex);
+ return errorcode == 0;
+ }
+ return false;
+}
+
+}
+#elif defined(LLVM_ON_UNIX)
+#include "Unix/Mutex.inc"
+#elif defined( LLVM_ON_WIN32)
+#include "Win32/Mutex.inc"
+#else
+#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in System/Mutex.cpp
+#endif
--- /dev/null
+//===- llvm/System/Unix/Mutex.inc - Unix Mutex Implementation ---*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Unix specific (non-pthread) Mutex class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic UNIX code that
+//=== is guaranteed to work on *all* UNIX variants.
+//===----------------------------------------------------------------------===//
+
+namespace llvm
+{
+using namespace sys;
+
+Mutex::Mutex( bool recursive)
+{
+}
+
+Mutex::~Mutex()
+{
+}
+
+bool
+Mutex::acquire()
+{
+}
+
+bool
+Mutex::release()
+{
+}
+
+bool
+Mutex::tryacquire( void )
+{
+}
+
+}
--- /dev/null
+//===- llvm/System/Win32/Mutex.inc - Win32 Mutex Implementation -*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Reid Spencer and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the Win32 specific (non-pthread) Mutex class.
+//
+//===----------------------------------------------------------------------===//
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only generic Win32 code that
+//=== is guaranteed to work on *all* Win32 variants.
+//===----------------------------------------------------------------------===//
+
+namespace llvm
+{
+using namespace sys;
+
+Mutex::Mutex( bool recursive)
+{
+}
+
+Mutex::~Mutex()
+{
+}
+
+bool
+Mutex::acquire()
+{
+}
+
+bool
+Mutex::release()
+{
+}
+
+bool
+Mutex::tryacquire( void )
+{
+}
+
+}
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