[glibc] nptl: Eliminate __pthread_multiple_threads

[Florian Weimer <fw@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=0df5d8d404fbf6a7802737b0f9d32ab3376cec86

commit 0df5d8d404fbf6a7802737b0f9d32ab3376cec86
Author: Florian Weimer <fweimer@redhat.com>
Date:   Mon May 10 10:31:41 2021 +0200

    nptl: Eliminate __pthread_multiple_threads
    
    It is no longer needed after the SINGLE_THREADED_P consolidation.
    
    Tested-by: Carlos O'Donell <carlos@redhat.com>
    Reviewed-by: Carlos O'Donell <carlos@redhat.com>

Diff:
---
 nptl/allocatestack.c  | 4 ++--
 nptl/pthreadP.h       | 7 -------
 nptl/pthread_cancel.c | 2 +-
 nptl/vars.c           | 7 -------
 4 files changed, 3 insertions(+), 17 deletions(-)

diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 059786192e..88c49f8154 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -477,7 +477,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
       /* This is at least the second thread.  */
       pd->header.multiple_threads = 1;
 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
-      __pthread_multiple_threads = __libc_multiple_threads = 1;
+      __libc_multiple_threads = 1;
 #endif
 
 #ifdef NEED_DL_SYSINFO
@@ -598,7 +598,7 @@ allocate_stack (const struct pthread_attr *attr, struct pthread **pdp,
 	  /* This is at least the second thread.  */
 	  pd->header.multiple_threads = 1;
 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
-	  __pthread_multiple_threads = __libc_multiple_threads = 1;
+	  __libc_multiple_threads = 1;
 #endif
 
 #ifdef NEED_DL_SYSINFO
diff --git a/nptl/pthreadP.h b/nptl/pthreadP.h
index dd6d6c6342..8ab247f977 100644
--- a/nptl/pthreadP.h
+++ b/nptl/pthreadP.h
@@ -370,13 +370,6 @@ extern unsigned long int *__fork_generation_pointer attribute_hidden;
 /* Register the generation counter in the libpthread with the libc.  */
 extern void __libc_pthread_init (void (*reclaim) (void));
 
-#ifndef TLS_MULTIPLE_THREADS_IN_TCB
-/* Variable set to a nonzero value either if more than one thread runs or ran,
-   or if a single-threaded process is trying to cancel itself.  See
-   nptl/descr.h for more context on the single-threaded process case.  */
-extern int __pthread_multiple_threads attribute_hidden;
-#endif
-
 extern size_t __pthread_get_minstack (const pthread_attr_t *attr);
 
 /* Namespace save aliases.  */
diff --git a/nptl/pthread_cancel.c b/nptl/pthread_cancel.c
index 2cab8f0a34..fd04bedf6c 100644
--- a/nptl/pthread_cancel.c
+++ b/nptl/pthread_cancel.c
@@ -90,7 +90,7 @@ __pthread_cancel (pthread_t th)
 	   points get executed.  */
 	THREAD_SETMEM (THREAD_SELF, header.multiple_threads, 1);
 #ifndef TLS_MULTIPLE_THREADS_IN_TCB
-	__pthread_multiple_threads = __libc_multiple_threads = 1;
+	__libc_multiple_threads = 1;
 #endif
     }
   /* Mark the thread as canceled.  This has to be done
diff --git a/nptl/vars.c b/nptl/vars.c
index 8de30856b8..03a6cc84be 100644
--- a/nptl/vars.c
+++ b/nptl/vars.c
@@ -26,10 +26,3 @@ union pthread_attr_transparent __default_pthread_attr attribute_hidden;
 
 /* Mutex protecting __default_pthread_attr.  */
 int __default_pthread_attr_lock = LLL_LOCK_INITIALIZER;
-
-#ifndef TLS_MULTIPLE_THREADS_IN_TCB
-/* Variable set to a nonzero value either if more than one thread runs or ran,
-   or if a single-threaded process is trying to cancel itself.  See
-   nptl/descr.h for more context on the single-threaded process case.  */
-int __pthread_multiple_threads attribute_hidden;
-#endif