X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FSupport%2FMutex.cpp;h=c8d3844d0c9618a19133836c06aabac831f42e35;hb=78832c6e7d33094c6ef9e99b07dac6f60c0a1207;hp=6271797da4785a4ee73280988429c5ed28a2fbdd;hpb=59e47e3ee10840beb57ece10af04a6f9bf3495e9;p=oota-llvm.git

diff --git a/lib/Support/Mutex.cpp b/lib/Support/Mutex.cpp
index 6271797da47..c8d3844d0c9 100644
--- a/lib/Support/Mutex.cpp
+++ b/lib/Support/Mutex.cpp
@@ -1,24 +1,122 @@
-//===-- Support/Lock.cpp - Platform-agnostic mutual exclusion -------------===//
-// 
+//===- Mutex.cpp - Mutual Exclusion Lock ------------------------*- C++ -*-===//
+//
 //                     The LLVM Compiler Infrastructure
 //
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-// 
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
 //===----------------------------------------------------------------------===//
 //
-// Implementation of various methods supporting platform-agnostic lock
-// abstraction. See Support/Lock.h for details.
+// This file implements the llvm::sys::Mutex class.
 //
 //===----------------------------------------------------------------------===//
 
-#include "Support/Lock.h"
+#include "llvm/Config/config.h"
+#include "llvm/Support/Mutex.h"
+
+//===----------------------------------------------------------------------===//
+//=== WARNING: Implementation here must contain only TRULY operating system
+//===          independent code.
+//===----------------------------------------------------------------------===//
+
+#if !defined(LLVM_ENABLE_THREADS) || LLVM_ENABLE_THREADS == 0
+// Define all methods as no-ops if threading is explicitly disabled
+namespace llvm {
+using namespace sys;
+MutexImpl::MutexImpl( bool recursive) { }
+MutexImpl::~MutexImpl() { }
+bool MutexImpl::acquire() { return true; }
+bool MutexImpl::release() { return true; }
+bool MutexImpl::tryacquire() { return true; }
+}
+#else
+
+#if defined(HAVE_PTHREAD_H) && defined(HAVE_PTHREAD_MUTEX_LOCK)
+
+#include <cassert>
+#include <pthread.h>
+#include <stdlib.h>
+
+namespace llvm {
+using namespace sys;
+
+// Construct a Mutex using pthread calls
+MutexImpl::MutexImpl( bool recursive)
+  : data_(nullptr)
+{
+  // 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); (void)errorcode;
+
+  // 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);
+
+  // Initialize the mutex
+  errorcode = pthread_mutex_init(mutex, &attr);
+  assert(errorcode == 0);
 
-using namespace llvm;
+  // Destroy the attributes
+  errorcode = pthread_mutexattr_destroy(&attr);
+  assert(errorcode == 0);
 
-Lock Lock::create () {
-  // Currently we only support creating POSIX pthread_mutex_t locks.
-  // In the future we might want to construct different kinds of locks
-  // based on what OS is running.
-  return POSIXLock ();
+  // Assign the data member
+  data_ = mutex;
 }
+
+// Destruct a Mutex
+MutexImpl::~MutexImpl()
+{
+  pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
+  assert(mutex != nullptr);
+  pthread_mutex_destroy(mutex);
+  free(mutex);
+}
+
+bool
+MutexImpl::acquire()
+{
+  pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
+  assert(mutex != nullptr);
+
+  int errorcode = pthread_mutex_lock(mutex);
+  return errorcode == 0;
+}
+
+bool
+MutexImpl::release()
+{
+  pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
+  assert(mutex != nullptr);
+
+  int errorcode = pthread_mutex_unlock(mutex);
+  return errorcode == 0;
+}
+
+bool
+MutexImpl::tryacquire()
+{
+  pthread_mutex_t* mutex = static_cast<pthread_mutex_t*>(data_);
+  assert(mutex != nullptr);
+
+  int errorcode = pthread_mutex_trylock(mutex);
+  return errorcode == 0;
+}
+
+}
+
+#elif defined(LLVM_ON_UNIX)
+#include "Unix/Mutex.inc"
+#elif defined( LLVM_ON_WIN32)
+#include "Windows/Mutex.inc"
+#else
+#warning Neither LLVM_ON_UNIX nor LLVM_ON_WIN32 was set in Support/Mutex.cpp
+#endif
+#endif