htl: Get sem_open/sem_close/sem_unlink support [BZ #25524]

This just moves the existing nptl implementation to reuse as it is in
htl.

2 files changed, 51 insertions, 2 deletions

diff --git a/htl/Makefile b/htl/Makefile
index 901deae..7eccd7a 100644
--- a/htl/Makefile
+++ b/htl/Makefile
@@ -128,8 +128,8 @@ libpthread-routines := pt-attr pt-attr-destroy pt-attr-getdetachstate	    \
 	pt-getschedparam pt-setschedparam pt-setschedprio		    \
 	pt-yield							    \
 									    \
-	sem-close sem-destroy sem-getvalue sem-init sem-open		    \
-	sem-post sem-timedwait sem-trywait sem-unlink			    \
+	sem_close sem-destroy sem-getvalue sem-init sem_open		    \
+	sem-post sem-timedwait sem-trywait sem_unlink			    \
 	sem-wait sem-waitfast						    \
 									    \
 	shm-directory							    \
diff --git a/htl/semaphoreP.h b/htl/semaphoreP.h
new file mode 100644
index 0000000..2273212
--- /dev/null
+++ b/htl/semaphoreP.h
@@ -0,0 +1,49 @@
+/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+#include <semaphore.h>
+#include "pt-internal.h"
+
+#define SEM_SHM_PREFIX  "sem."
+
+/* Keeping track of currently used mappings.  */
+struct inuse_sem
+{
+  dev_t dev;
+  ino_t ino;
+  int refcnt;
+  sem_t *sem;
+  char name[0];
+};
+
+
+/* The search tree for existing mappings.  */
+extern void *__sem_mappings attribute_hidden;
+
+/* Lock to protect the search tree.  */
+extern int __sem_mappings_lock attribute_hidden;
+
+
+/* Comparison function for search in tree with existing mappings.  */
+extern int __sem_search (const void *a, const void *b) attribute_hidden;
+
+static inline void __new_sem_open_init (struct new_sem *sem, unsigned value)
+{
+  /* This always is a shared semaphore.  */
+  *sem = (struct new_sem) __SEMAPHORE_INITIALIZER (1, value);
+}