From 9e6d35490a6542f9c97607f93c2ef8ca8e03cbcc Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Wed, 6 Jan 2016 20:12:03 +0000
Subject: Vendor import of lldb trunk r256945:
 https://llvm.org/svn/llvm-project/lldb/trunk@256945

---
 source/Host/windows/ProcessRunLock.cpp | 106 +++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 source/Host/windows/ProcessRunLock.cpp

(limited to 'source/Host/windows/ProcessRunLock.cpp')

diff --git a/source/Host/windows/ProcessRunLock.cpp b/source/Host/windows/ProcessRunLock.cpp
new file mode 100644
index 000000000000..1f21552a3062
--- /dev/null
+++ b/source/Host/windows/ProcessRunLock.cpp
@@ -0,0 +1,106 @@
+#include "lldb/Host/ProcessRunLock.h"
+#include "lldb/Host/windows/windows.h"
+
+namespace
+{
+#if defined(__MINGW32__)
+// Taken from WinNT.h
+typedef struct _RTL_SRWLOCK {
+    PVOID Ptr;
+} RTL_SRWLOCK, *PRTL_SRWLOCK;
+
+// Taken from WinBase.h
+typedef RTL_SRWLOCK SRWLOCK, *PSRWLOCK;
+#endif
+}
+
+
+static PSRWLOCK GetLock(lldb::rwlock_t lock)
+{
+    return static_cast<PSRWLOCK>(lock);
+}
+
+static bool ReadLock(lldb::rwlock_t rwlock)
+{
+    ::AcquireSRWLockShared(GetLock(rwlock));
+    return true;
+}
+
+static bool ReadUnlock(lldb::rwlock_t rwlock)
+{
+    ::ReleaseSRWLockShared(GetLock(rwlock));
+    return true;
+}
+
+static bool WriteLock(lldb::rwlock_t rwlock)
+{
+    ::AcquireSRWLockExclusive(GetLock(rwlock));
+    return true;
+}
+
+static bool WriteTryLock(lldb::rwlock_t rwlock)
+{
+    return !!::TryAcquireSRWLockExclusive(GetLock(rwlock));
+}
+
+static bool WriteUnlock(lldb::rwlock_t rwlock)
+{
+    ::ReleaseSRWLockExclusive(GetLock(rwlock));
+    return true;
+}
+
+using namespace lldb_private;
+
+ProcessRunLock::ProcessRunLock()
+    : m_running(false)
+{
+    m_rwlock = new SRWLOCK;
+    InitializeSRWLock(GetLock(m_rwlock));
+}
+
+ProcessRunLock::~ProcessRunLock()
+{
+    delete m_rwlock;
+}
+
+bool ProcessRunLock::ReadTryLock()
+{
+    ::ReadLock(m_rwlock);
+    if (m_running == false)
+        return true;
+    ::ReadUnlock(m_rwlock);
+    return false;
+}
+
+bool ProcessRunLock::ReadUnlock()
+{
+    return ::ReadUnlock(m_rwlock);
+}
+
+bool ProcessRunLock::SetRunning ()
+{
+    WriteLock(m_rwlock);
+    m_running = true;
+    WriteUnlock(m_rwlock);
+    return true;
+}
+
+bool ProcessRunLock::TrySetRunning ()
+{
+    if (WriteTryLock(m_rwlock))
+    {
+        bool was_running = m_running;
+        m_running = true;
+        WriteUnlock(m_rwlock);
+        return !was_running;
+    }
+    return false;
+}
+
+bool ProcessRunLock::SetStopped ()
+{
+    WriteLock(m_rwlock);
+    m_running = false;
+    WriteUnlock(m_rwlock);
+    return true;
+}
-- 
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