[PATCH] Mark new threads as global signal receivers

[Jeremie Koenig <jk at jk dot fr dot eu dot org>]

* sysdeps/mach/hurd/pt-sigstate-init.c (__pthread_sigstate_init):
  Call _hurd_sigstate_set_global_rcv for newly created threads.
  Declare it as a weak symbol so that we stay compatible with previous
  glibc versions.
---
 sysdeps/mach/hurd/pt-sigstate-init.c |   20 +++++++++++++++++++-
 1 files changed, 19 insertions(+), 1 deletions(-)

diff --git a/sysdeps/mach/hurd/pt-sigstate-init.c b/sysdeps/mach/hurd/pt-sigstate-init.c
index da5a945..811f7b3 100644
--- a/sysdeps/mach/hurd/pt-sigstate-init.c
+++ b/sysdeps/mach/hurd/pt-sigstate-init.c
@@ -19,9 +19,14 @@
 
 #include <pthread.h>
 #include <hurd/threadvar.h>
+#include <hurd/signal.h>
 
 #include <pt-internal.h>
 
+/* Preserve compatibility with older glibc versions.  */
+void _hurd_sigstate_set_global_rcv (struct hurd_sigstate *ss)
+	__attribute__((weak));
+
 error_t
 __pthread_sigstate_init (struct __pthread *thread)
 {
@@ -30,8 +35,21 @@ __pthread_sigstate_init (struct __pthread *thread)
 						thread->stackaddr);
 
   /* The real initialization happens internally in glibc the first
-     time that _hurd_thead_sigstate is called.  */
+     time that _hurd_self_sigstate is called.  */
   *location = 0;
 
+  /* Mark the thread as a global signal receiver so as to conform with
+     the pthread semantics.  However, we must be careful.  The first
+     pthread created is the main thread, during libpthread initialization.
+     We must not mark it, otherwise the sigprocmask call in
+     __pthread_create would try to access _hurd_global_sigstate,
+     which is not initialized yet.  When glibc runs _hurdsig_init later
+     on, the message thread is created, which must not be marked either.  */
+  if (_hurd_sigstate_set_global_rcv && __pthread_num_threads > 2)
+    {
+      struct hurd_sigstate *ss = _hurd_thread_sigstate (thread->kernel_thread);
+      _hurd_sigstate_set_global_rcv (ss);
+    }
+
   return 0;
 }
-- 
1.7.1