[NativeProcessLinux] Integrate MainLoop

Summary:
This commit integrates MainLoop into NativeProcessLinux. By registering a SIGCHLD handler with
the llgs main loop, we can get rid of the special monitor thread in NPL, which saves as a lot of
thread ping-pong when responding to client requests (e.g. qThreadInfo processing time has been
reduced by about 40%). It also makes the code simpler, IMHO.

Reviewers: ovyalov, clayborg, tberghammer, chaoren

Subscribers: lldb-commits

Differential Revision: http://reviews.llvm.org/D11150

This is a resubmission of r242305 after it was reverted due to bad interactions with the stdio
thread.

llvm-svn: 242783

1 files changed, 2 insertions, 6 deletions

diff --git a/lldb/source/Host/common/NativeProcessProtocol.cpp b/lldb/source/Host/common/NativeProcessProtocol.cpp
index 818d69bdabd..7d2f4012bf8 100644
--- a/lldb/source/Host/common/NativeProcessProtocol.cpp
+++ b/lldb/source/Host/common/NativeProcessProtocol.cpp
@@ -436,12 +436,6 @@ NativeProcessProtocol::DoStopIDBumped (uint32_t /* newBumpId */)
     // Default implementation does nothing.
 }
 
-void
-NativeProcessProtocol::Terminate ()
-{
-    // Default implementation does nothing.
-}
-
 #ifndef __linux__
 // These need to be implemented to support lldb-gdb-server on a given platform. Stubs are
 // provided to make the rest of the code link on non-supported platforms.
@@ -449,6 +443,7 @@ NativeProcessProtocol::Terminate ()
 Error
 NativeProcessProtocol::Launch (ProcessLaunchInfo &launch_info,
         NativeDelegate &native_delegate,
+        MainLoop &mainloop,
         NativeProcessProtocolSP &process_sp)
 {
     llvm_unreachable("Platform has no NativeProcessProtocol support");
@@ -457,6 +452,7 @@ NativeProcessProtocol::Launch (ProcessLaunchInfo &launch_info,
 Error
 NativeProcessProtocol::Attach (lldb::pid_t pid,
         NativeDelegate &native_delegate,
+        MainLoop &mainloop,
         NativeProcessProtocolSP &process_sp)
 {
     llvm_unreachable("Platform has no NativeProcessProtocol support");