1 files changed, 16 insertions, 0 deletions
diff --git a/gdbsupport/ptid.h b/gdbsupport/ptid.h
index ef52d55..a528312 100644
--- a/gdbsupport/ptid.h
+++ b/gdbsupport/ptid.h
@@ -32,6 +32,8 @@
    thread_stratum target that might want to sit on top.
 */
 
+#include <functional>
+
 class ptid_t
 {
 public:
@@ -143,6 +145,20 @@ private:
   long m_tid;
 };
 
+/* Functor to hash a ptid.  */
+
+struct hash_ptid
+{
+  size_t operator() (const ptid_t &ptid) const
+  {
+    std::hash<long> long_hash;
+
+    return (long_hash (ptid.pid ())
+	    + long_hash (ptid.lwp ())
+	    + long_hash (ptid.tid ()));
+  }
+};
+
 /* The null or zero ptid, often used to indicate no process. */
 
 extern const ptid_t null_ptid;