Send thread names to debugger

GDB since commit 24cdb46e [1] can report and use these names.

Add utility function SetThreadName(), which sends a thread name to the
debugger.

Use that:
- to set the default thread name for main thread and newly created pthreads.
- in pthread_setname_np() for user thread names.
- for helper thread names in cygthread::create()
- for helper threads which are created directly with CreateThread.

Note that there can still be anonymous threads, created by system or
injected DLLs.

[1] https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=24cdb46e9f0a694b4fbc11085e094857f08c0419

1 files changed, 1 insertions, 0 deletions

diff --git a/winsup/cygwin/dcrt0.cc b/winsup/cygwin/dcrt0.cc
index 2328411..8ddee0c 100644
--- a/winsup/cygwin/dcrt0.cc
+++ b/winsup/cygwin/dcrt0.cc
@@ -964,6 +964,7 @@ dll_crt0_1 (void *)
       if (cp > __progname && ascii_strcasematch (cp, ".exe"))
 	*cp = '\0';
     }
+  SetThreadName (GetCurrentThreadId (), program_invocation_short_name);
 
   (void) xdr_set_vprintf (&cygxdr_vwarnx);
   cygwin_finished_initializing = true;