Add a new SBThread::SafeToCallFunctions API; this calls over to

the SystemRuntime to check if a thread will have any problems 
performing an inferior function call so the driver can skip
making that function call on that thread.  Often the function
call can be executed on another thread instead.
<rdar://problem/16777874> 

llvm-svn: 208732

1 files changed, 8 insertions, 0 deletions

diff --git a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp
index 40b61fe9981..46e76663c47 100644
--- a/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp
+++ b/lldb/source/Plugins/SystemRuntime/MacOSX/AppleGetThreadItemInfoHandler.cpp
@@ -273,6 +273,14 @@ AppleGetThreadItemInfoHandler::GetThreadItemInfo (Thread &thread, tid_t thread_i
 
     error.Clear();
 
+    if (thread.SafeToCallFunctions() == false)
+    {
+        if (log)
+            log->Printf ("Not safe to call functions on thread 0x%" PRIx64, thread.GetID());
+        error.SetErrorString ("Not safe to call functions on this thread.");
+        return return_value;
+    }
+
     // Set up the arguments for a call to
 
     // struct get_thread_item_info_return_values