1 files changed, 230 insertions, 0 deletions
diff --git a/gold/gold-threads.cc b/gold/gold-threads.cc
new file mode 100644
index 0000000..c6e1170
--- /dev/null
+++ b/gold/gold-threads.cc
@@ -0,0 +1,230 @@
+// gold-threads.cc -- thread support for gold
+
+#include <cassert>
+
+#include "gold.h"
+
+#ifdef ENABLE_THREADS
+#include <pthread.h>
+#endif
+
+#include "gold-threads.h"
+
+namespace gold
+{
+
+// Class Lock_impl. 
+
+class Lock_impl
+{
+ public:
+  Lock_impl();
+  ~Lock_impl();
+
+  void acquire();
+
+  void release();
+
+private:
+  // This class can not be copied.
+  Lock_impl(const Lock_impl&);
+  Lock_impl& operator=(const Lock_impl&);
+
+  friend class Condvar_impl;
+
+#ifdef ENABLE_THREADS
+  pthread_mutex_t mutex_;
+#else
+  bool acquired_;
+#endif
+};
+
+#ifdef ENABLE_THREADS
+
+Lock_impl::Lock_impl()
+{
+  pthread_mutexattr_t attr;
+  if (pthread_mutexattr_init(&attr) != 0)
+    gold_fatal(_("pthead_mutextattr_init failed"), true);
+#ifdef PTHREAD_MUTEXT_ADAPTIVE_NP
+  if (pthread_mutextattr_settype(&attr, PTHREAD_MUTEX_ADAPTIVE_NP) != 0)
+    gold_fatal(_("pthread_mutextattr_settype failed"), true);
+#endif
+
+  if (pthread_mutex_init (&this->mutex_, &attr) != 0)
+    gold_fatal(_("pthread_mutex_init failed"), true);
+
+  if (pthread_mutexattr_destroy(&attr) != 0)
+    gold_fatal(_("pthread_mutexattr_destroy failed"), true);
+}
+
+Lock_impl::~Lock_impl()
+{
+  if (pthread_mutex_destroy(&this->mutex_) != 0)
+    gold_fatal(_("pthread_mutex_destroy failed"), true);
+}
+
+void
+Lock_impl::acquire()
+{
+  if (pthread_mutex_lock(&this->mutex_) != 0)
+    gold_fatal(_("pthread_mutex_lock failed"), true);
+}
+
+void
+Lock_impl::release()
+{
+  if (pthread_mutex_unlock(&this->mutex_) != 0)
+    gold_fatal(_("pthread_mutex_unlock failed"), true);
+}
+
+#else // !defined(ENABLE_THREADS)
+
+Lock_impl::Lock_impl()
+  : acquired_(false)
+{
+}
+
+Lock_impl::~Lock_impl()
+{
+  assert(!this->acquired_);
+}
+
+void
+Lock_impl::acquire()
+{
+  assert(!this->acquired_);
+  this->acquired_ = true;
+}
+
+void
+Lock_impl::release()
+{
+  assert(this->acquired_);
+  this->acquired_ = false;
+}
+
+#endif // !defined(ENABLE_THREADS)
+
+// Methods for Lock class.
+
+Lock::Lock()
+{
+  this->lock_ = new Lock_impl;
+}
+
+Lock::~Lock()
+{
+  delete this->lock_;
+}
+
+void
+Lock::acquire()
+{
+  this->lock_->acquire();
+}
+
+void
+Lock::release()
+{
+  this->lock_->release();
+}
+
+// Class Condvar_impl.
+
+class Condvar_impl
+{
+ public:
+  Condvar_impl();
+  ~Condvar_impl();
+
+  void wait(Lock_impl*);
+  void signal();
+
+ private:
+  // This class can not be copied.
+  Condvar_impl(const Condvar_impl&);
+  Condvar_impl& operator=(const Condvar_impl&);
+
+#ifdef ENABLE_THREADS
+  pthread_cond_t cond_;
+#endif
+};
+
+#ifdef ENABLE_THREADS
+
+Condvar_impl::Condvar_impl()
+{
+  if (pthread_cond_init(&this->cond_, NULL) != 0)
+    gold_fatal(_("pthread_cond_init failed"), true);
+}
+
+Condvar_impl::~Condvar_impl()
+{
+  if (pthread_cond_destroy(&this->cond_) != 0)
+    gold_fatal(_("pthread_cond_destroy failed"), true);
+}
+
+void
+Condvar_impl::wait(Lock_impl* li)
+{
+  if (pthread_cond_wait(&this->cond_, &li->mutex_) != 0)
+    gold_fatal(_("pthread_cond_wait failed"), true);
+}
+
+void
+Condvar_impl::signal()
+{
+  if (pthread_cond_signal(&this->cond_) != 0)
+    gold_fatal(_("pthread_cond_signal failed"), true);
+}
+
+#else // !defined(ENABLE_THREADS)
+
+Condvar_impl::Condvar_impl()
+{
+}
+
+Condvar_impl::~Condvar_impl()
+{
+}
+
+void
+Condvar_impl::wait(Lock_impl* li)
+{
+  assert(li->acquired_);
+}
+
+void
+Condvar_impl::signal()
+{
+}
+
+#endif // !defined(ENABLE_THREADS)
+
+// Methods for Condvar class.
+
+Condvar::Condvar(Lock& lock)
+  : lock_(lock)
+{
+  this->condvar_ = new Condvar_impl;
+}
+
+Condvar::~Condvar()
+{
+  delete this->condvar_;
+}
+
+void
+Condvar::wait()
+{
+  this->condvar_->wait(this->lock_.get_impl());
+}
+
+void
+Condvar::signal()
+{
+  this->condvar_->signal();
+}
+
+} // End namespace gold.