Patch from Jay Cornwall that modifies the LLDB "Host" layer to reuse more

code between linux, darwin and BSD.

llvm-svn: 113263

1 files changed, 106 insertions, 0 deletions

diff --git a/lldb/source/Host/common/Condition.cpp b/lldb/source/Host/common/Condition.cpp
new file mode 100644
index 00000000000..4e93db766db
--- /dev/null
+++ b/lldb/source/Host/common/Condition.cpp
@@ -0,0 +1,106 @@
+//===-- Condition.cpp -------------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include <errno.h>
+
+#include "lldb/Host/Condition.h"
+#include "lldb/Host/TimeValue.h"
+
+
+using namespace lldb_private;
+
+//----------------------------------------------------------------------
+// Default constructor
+//
+// The default constructor will initialize a new pthread condition
+// and maintain the condition in the object state.
+//----------------------------------------------------------------------
+Condition::Condition () :
+    m_condition()
+{
+    ::pthread_cond_init (&m_condition, NULL);
+}
+
+//----------------------------------------------------------------------
+// Destructor
+//
+// Destroys the pthread condition that the object owns.
+//----------------------------------------------------------------------
+Condition::~Condition ()
+{
+    ::pthread_cond_destroy (&m_condition);
+}
+
+//----------------------------------------------------------------------
+// Unblock all threads waiting for a condition variable
+//----------------------------------------------------------------------
+int
+Condition::Broadcast ()
+{
+    return ::pthread_cond_broadcast (&m_condition);
+}
+
+//----------------------------------------------------------------------
+// Get accessor to the pthread condition object
+//----------------------------------------------------------------------
+pthread_cond_t *
+Condition::GetCondition ()
+{
+    return &m_condition;
+}
+
+//----------------------------------------------------------------------
+// Unblocks one thread waiting for the condition variable
+//----------------------------------------------------------------------
+int
+Condition::Signal ()
+{
+    return ::pthread_cond_signal (&m_condition);
+}
+
+//----------------------------------------------------------------------
+// The Wait() function atomically blocks the current thread
+// waiting on the owend condition variable, and unblocks the mutex
+// specified by "mutex".  The waiting thread unblocks only after
+// another thread calls Signal(), or Broadcast() with the same
+// condition variable, or if "abstime" is valid (non-NULL) this
+// function will return when the system time reaches the time
+// specified in "abstime". If "abstime" is NULL this function will
+// wait for an infinite amount of time for the condition variable
+// to be signaled or broadcasted.
+//
+// The current thread re-acquires the lock on "mutex".
+//----------------------------------------------------------------------
+int
+Condition::Wait (pthread_mutex_t *mutex, const TimeValue *abstime, bool *timed_out)
+{
+    int err = 0;
+    do
+    {
+        if (abstime && abstime->IsValid())
+        {
+            struct timespec abstime_ts = abstime->GetAsTimeSpec();
+            err = ::pthread_cond_timedwait (&m_condition, mutex, &abstime_ts);
+        }
+        else
+            err = ::pthread_cond_wait (&m_condition, mutex);
+    } while (err == EINTR);
+
+    if (timed_out != NULL)
+    {
+        if (err == ETIMEDOUT)
+            *timed_out = true;
+        else
+            *timed_out = false;
+    }
+
+
+    return err;
+}
+