From 58aabf08b77d221489f10e274812ec60917c21a8 Mon Sep 17 00:00:00 2001
From: Andrew Turner <andrew@FreeBSD.org>
Date: Fri, 18 Jan 2013 20:06:45 +0000
Subject: Import compiler-rt r172839.

---
 lib/tsan/rtl/tsan_mutexset.h | 65 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 lib/tsan/rtl/tsan_mutexset.h

(limited to 'lib/tsan/rtl/tsan_mutexset.h')

diff --git a/lib/tsan/rtl/tsan_mutexset.h b/lib/tsan/rtl/tsan_mutexset.h
new file mode 100644
index 000000000000..09223ff6cc48
--- /dev/null
+++ b/lib/tsan/rtl/tsan_mutexset.h
@@ -0,0 +1,65 @@
+//===-- tsan_mutexset.h -----------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is a part of ThreadSanitizer (TSan), a race detector.
+//
+// MutexSet holds the set of mutexes currently held by a thread.
+//===----------------------------------------------------------------------===//
+#ifndef TSAN_MUTEXSET_H
+#define TSAN_MUTEXSET_H
+
+#include "tsan_defs.h"
+
+namespace __tsan {
+
+class MutexSet {
+ public:
+  // Holds limited number of mutexes.
+  // The oldest mutexes are discarded on overflow.
+  static const uptr kMaxSize = 64;
+  struct Desc {
+    u64 id;
+    u64 epoch;
+    int count;
+    bool write;
+  };
+
+  MutexSet();
+  // The 'id' is obtained from SyncVar::GetId().
+  void Add(u64 id, bool write, u64 epoch);
+  void Del(u64 id, bool write);
+  void Remove(u64 id);  // Removes the mutex completely (if it's destroyed).
+  uptr Size() const;
+  Desc Get(uptr i) const;
+
+ private:
+#ifndef TSAN_GO
+  uptr size_;
+  Desc descs_[kMaxSize];
+#endif
+
+  void RemovePos(uptr i);
+};
+
+// Go does not have mutexes, so do not spend memory and time.
+// (Go sync.Mutex is actually a semaphore -- can be unlocked
+// in different goroutine).
+#ifdef TSAN_GO
+MutexSet::MutexSet() {}
+void MutexSet::Add(u64 id, bool write, u64 epoch) {}
+void MutexSet::Del(u64 id, bool write) {}
+void MutexSet::Remove(u64 id) {}
+void MutexSet::RemovePos(uptr i) {}
+uptr MutexSet::Size() const { return 0; }
+MutexSet::Desc MutexSet::Get(uptr i) const { return Desc(); }
+#endif
+
+}  // namespace __tsan
+
+#endif  // TSAN_REPORT_H
-- 
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