1 files changed, 141 insertions, 0 deletions
diff --git a/lib/System/Mutex.cpp b/lib/System/Mutex.cpp
new file mode 100644
index 0000000000..2a15197691
--- /dev/null
+++ b/lib/System/Mutex.cpp
@@ -0,0 +1,141 @@
+//===- 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