2008-06-01 Neal H. Walfield <neal@gnu.org>

	* include/pthread/pthread.h (PTHREAD_MUTEX_RECURSIVE_INITIALIZER_NP):
	New definition.
	* sysdeps/generic/bits/mutex.h
	(__PTHREAD_MUTEX_RECURSIVE_INITIALIZER): New definition.
	* sysdeps/generic/bits/mutex-attr.h (__pthread_recursive_mutexattr):
	New definition.
	* sysdeps/generic/pt-mutexattr.c (__pthread_recursive_mutexattr):
	New declaration.
	* sysdeps/generic/pt-mutex-init.c (_pthread_mutex_init): If ATTR
	is &__PTHREAD_RECURSIVE_MUTEXATTR, don't allocate a copy, just
	save in MUTEX->ATTR.
	* sysdeps/generic/pt-mutex-destroy.c (_pthread_mutex_destroy): If
	MUTEX->ATTR is &__PTHREAD_RECURSIVE_MUTEXATTR, don't free it.

5 files changed, 31 insertions, 8 deletions

diff --git a/sysdeps/generic/bits/mutex-attr.h b/sysdeps/generic/bits/mutex-attr.h
index 883b0746..420d5d1c 100644
--- a/sysdeps/generic/bits/mutex-attr.h
+++ b/sysdeps/generic/bits/mutex-attr.h
@@ -1,5 +1,5 @@
 /* Mutex attribute type.  Generic version.
-   Copyright (C) 2002 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -30,4 +30,7 @@ struct __pthread_mutexattr
   enum __pthread_mutex_type mutex_type;
 };
 
+/* Attributes for a recursive mutex.  */
+extern const struct __pthread_mutexattr __pthread_recursive_mutexattr;
+
 #endif /* bits/mutex-attr.h */
diff --git a/sysdeps/generic/bits/mutex.h b/sysdeps/generic/bits/mutex.h
index 1aaf80ed..e0ae3db1 100644
--- a/sysdeps/generic/bits/mutex.h
+++ b/sysdeps/generic/bits/mutex.h
@@ -1,5 +1,5 @@
 /* Mutex type.  Generic version.
-   Copyright (C) 2000, 2002, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2002, 2005, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -54,6 +54,10 @@ struct __pthread_mutex
 #  define __PTHREAD_MUTEX_INITIALIZER \
     { __SPIN_LOCK_INITIALIZER, __SPIN_LOCK_INITIALIZER, 0, 0, 0, 0, 0, 0 }
 
+#  define __PTHREAD_MUTEX_RECURSIVE_INITIALIZER			\
+    { __SPIN_LOCK_INITIALIZER, __SPIN_LOCK_INITIALIZER, 0, 0,	\
+	(struct __pthread_mutexattr *) &__pthread_recursive_mutexattr, 0, 0, 0 }
+
 # endif
 #endif /* Not __pthread_mutex_defined.  */
 
diff --git a/sysdeps/generic/pt-mutex-destroy.c b/sysdeps/generic/pt-mutex-destroy.c
index 72faefe6..0c9d5140 100644
--- a/sysdeps/generic/pt-mutex-destroy.c
+++ b/sysdeps/generic/pt-mutex-destroy.c
@@ -1,5 +1,5 @@
 /* Destroy a mutex.  Generic version.
-   Copyright (C) 2000,02 Free Software Foundation, Inc.
+   Copyright (C) 2000,02, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -26,7 +26,10 @@
 int
 _pthread_mutex_destroy (pthread_mutex_t *mutex)
 {
-  if (mutex->attr)
+  if (mutex->attr == &__pthread_recursive_mutexattr)
+    /* Static attributes.  */
+    ;
+  else
     free (mutex->attr);
 
   return 0;
diff --git a/sysdeps/generic/pt-mutex-init.c b/sysdeps/generic/pt-mutex-init.c
index da1781bf..83f5b185 100644
--- a/sysdeps/generic/pt-mutex-init.c
+++ b/sysdeps/generic/pt-mutex-init.c
@@ -1,5 +1,5 @@
 /* Initialize a mutex.  Generic version.
-   Copyright (C) 2000, 2002, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2002, 2005, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -32,10 +32,15 @@ _pthread_mutex_init (pthread_mutex_t *mutex,
 
   if (! attr
       || memcmp (attr, &__pthread_default_mutexattr, sizeof (*attr) == 0))
-    /* Use the default attributes.  */
+    /* The default attributes.  */
     return 0;
 
-  /* Non-default attributes.  */
+  if (attr == &__pthread_recursive_mutexattr)
+    /* Non-default but known attributes.  */
+    {
+      mutex->attr = attr;
+      return 0;
+    }
 
   mutex->attr = malloc (sizeof *attr);
   if (! mutex->attr)
diff --git a/sysdeps/generic/pt-mutexattr.c b/sysdeps/generic/pt-mutexattr.c
index 647db241..d80a7d74 100644
--- a/sysdeps/generic/pt-mutexattr.c
+++ b/sysdeps/generic/pt-mutexattr.c
@@ -1,5 +1,5 @@
 /* Default mutex attributes.  Generic version.
-   Copyright (C) 2000,02 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2002, 2008 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -27,3 +27,11 @@ const struct __pthread_mutexattr __pthread_default_mutexattr =
   pshared: PTHREAD_PROCESS_PRIVATE,
   mutex_type: PTHREAD_MUTEX_DEFAULT
 };
+
+const struct __pthread_mutexattr __pthread_recursive_mutexattr =
+{
+  prioceiling: 0,
+  protocol: PTHREAD_PRIO_NONE,
+  pshared: PTHREAD_PROCESS_PRIVATE,
+  mutex_type: PTHREAD_MUTEX_RECURSIVE
+};