Update.

2000-05-23  Jakub Jelinek  <jakub@redhat.com>

	* sysdeps/i386/fpu/bits/mathinline.h (__sincos, __sincosf,
	__sincosl): Guard with __USE_GNU.

9 files changed, 642 insertions, 5 deletions

diff --git a/linuxthreads/sysdeps/alpha/pspinlock.c b/linuxthreads/sysdeps/alpha/pspinlock.c
new file mode 100644
index 0000000000..0d871b4174
--- /dev/null
+++ b/linuxthreads/sysdeps/alpha/pspinlock.c
@@ -0,0 +1,109 @@
+/* POSIX spinlock implementation.  Alpha version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+/* This implementation is similar to the one used in the Linux kernel.
+   But the kernel is byte instructions for the memory access.  This is
+   faster but unusable here.  The problem is that only 128
+   threads/processes could use the spinlock at the same time.  If (by
+   a design error in the program) a thread/process would hold the
+   spinlock for a time long enough to accumulate 128 waiting
+   processes, the next one will find a positive value in the spinlock
+   and assume it is unlocked.  We cannot accept that.  */
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  unsigned int tmp;
+  asm volatile
+    ("1:	ldl_l	%0,%1\n"
+     "		blbs	%0,2f\n"
+     "		or	%0,1,%0\n"
+     "		stl_c	%0,%1\n"
+     "		beq	%0,2f\n"
+     "		mb\n"
+     ".subsection 2\n"
+     "2:	ldl	%0,%1\n"
+     "		blbs	%0,2b\n"
+     "		br	1b\n"
+     ".previous"
+     : "=r" (tmp), "=m" (lock)
+     : "m" (lock));
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  unsigned long int oldval;
+  unsigned long int temp;
+
+  asm volatile
+    ("1:	ldl_l	%0,%1\n"
+     "		and	%0,%3,%2\n"
+     "		bne	%2,2f\n"
+     "		xor	%0,%3,%0\n"
+     "		stl_c	%0,%1\n"
+     "		beq	%0,3f\n"
+     "		mb\n"
+     "2:\n"
+     ".subsection 2\n"
+     "3:	br	1b\n"
+     ".previous"
+     : "=&r" (temp), "=m" (*lock), "=&r" (oldval)
+     : "Ir" (1UL), "m" (*lock));
+
+  return oldval == 0 ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  asm volatile ("mb");
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  *lock = 0;
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/arm/pspinlock.c b/linuxthreads/sysdeps/arm/pspinlock.c
new file mode 100644
index 0000000000..a56881adfd
--- /dev/null
+++ b/linuxthreads/sysdeps/arm/pspinlock.c
@@ -0,0 +1,81 @@
+/* POSIX spinlock implementation.  Arm version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  unsigned int val;
+
+  do
+    asm volatile ("swp %0, %1, [%2]"
+		  : "=r" (val)
+		  : "0" (1), "r" (lock)
+		  : "memory");
+  while (val != 0);
+
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  unsigned int val;
+
+  asm volatile ("swp %0, %1, [%2]"
+		: "=r" (val)
+		: "0" (1), "r" (lock)
+		: "memory");
+
+  return val ? EBUSY : 0;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/i386/pspinlock.c b/linuxthreads/sysdeps/i386/pspinlock.c
new file mode 100644
index 0000000000..426e63a70c
--- /dev/null
+++ b/linuxthreads/sysdeps/i386/pspinlock.c
@@ -0,0 +1,97 @@
+/* POSIX spinlock implementation.  x86 version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+/* This implementation is similar to the one used in the Linux kernel.
+   But the kernel is byte instructions for the memory access.  This is
+   faster but unusable here.  The problem is that only 128
+   threads/processes could use the spinlock at the same time.  If (by
+   a design error in the program) a thread/process would hold the
+   spinlock for a time long enough to accumulate 128 waiting
+   processes, the next one will find a positive value in the spinlock
+   and assume it is unlocked.  We cannot accept that.  */
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  asm volatile
+    ("\n"
+     "1:\n\t"
+     "lock; decl %0\n\t"
+     "js 2f\n\t"
+     ".section .text.spinlock,\"ax\"\n"
+     "2:\n\t"
+     "cmpl $0,%0\n\t"
+     "rep; nop\n\t"
+     "jle 2b\n\t"
+     "jmp 1b\n\t"
+     ".previous"
+     : "=m" (*lock));
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  int oldval;
+
+  asm volatile
+    ("xchgl %0,%1"
+     : "=r" (oldval), "=m" (*lock)
+     : "0" (0));
+  return oldval > 0 ? 0 : EBUSY;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  asm volatile
+    ("movl $1,%0"
+     : "=m" (*lock));
+  return 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  *lock = 1;
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/m68k/pspinlock.c b/linuxthreads/sysdeps/m68k/pspinlock.c
new file mode 100644
index 0000000000..994adc883c
--- /dev/null
+++ b/linuxthreads/sysdeps/m68k/pspinlock.c
@@ -0,0 +1,81 @@
+/* POSIX spinlock implementation.  M68k version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  unsigned int val;
+
+  do
+    asm volatile ("tas %1; sne %0"
+		  : "=dm" (val), "=m" (*lock)
+		  : "m" (*lock)
+		  : "cc");
+  while (val);
+
+  return 0;
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  unsigned int val;
+
+  asm volatile ("tas %1; sne %0"
+		: "=dm" (val), "=m" (*lock)
+		: "m" (*lock)
+		: "cc");
+
+  return val ? EBUSY : 0;
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  return *lock = 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/mips/pspinlock.c b/linuxthreads/sysdeps/mips/pspinlock.c
new file mode 100644
index 0000000000..d6cda216ff
--- /dev/null
+++ b/linuxthreads/sysdeps/mips/pspinlock.c
@@ -0,0 +1,66 @@
+/* POSIX spinlock implementation.  MIPS version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  XXX
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/powerpc/pspinlock.c b/linuxthreads/sysdeps/powerpc/pspinlock.c
new file mode 100644
index 0000000000..6858ee1cf8
--- /dev/null
+++ b/linuxthreads/sysdeps/powerpc/pspinlock.c
@@ -0,0 +1,66 @@
+/* POSIX spinlock implementation.  PowerPC version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  XXX
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h b/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h
index a4878310ac..99e56d23ee 100644
--- a/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h
+++ b/linuxthreads/sysdeps/pthread/bits/pthreadtypes.h
@@ -23,11 +23,11 @@
 #include <bits/sched.h>
 
 /* Fast locks (not abstract because mutexes and conditions aren't abstract). */
-typedef struct
+struct _pthread_fastlock
 {
   long int __status;            /* "Free" or "taken" or head of waiting list */
   int __spinlock;               /* For compare-and-swap emulation */
-} pthread_spinlock_t;
+};
 
 #ifndef _PTHREAD_DESCR_DEFINED
 /* Thread descriptors */
@@ -54,7 +54,7 @@ typedef struct
 /* Conditions (not abstract because of PTHREAD_COND_INITIALIZER */
 typedef struct
 {
-  pthread_spinlock_t __c_lock; /* Protect against concurrent access */
+  struct _pthread_fastlock __c_lock; /* Protect against concurrent access */
   _pthread_descr __c_waiting;        /* Threads waiting on this condition */
 } pthread_cond_t;
 
@@ -78,7 +78,7 @@ typedef struct
   int __m_count;                  /* Depth of recursive locking */
   _pthread_descr __m_owner;       /* Owner thread (if recursive or errcheck) */
   int __m_kind;                   /* Mutex kind: fast, recursive or errcheck */
-  pthread_spinlock_t __m_lock;    /* Underlying fast lock */
+  struct _pthread_fastlock __m_lock; /* Underlying fast lock */
 } pthread_mutex_t;
 
 
@@ -97,7 +97,7 @@ typedef int pthread_once_t;
 /* Read-write locks.  */
 typedef struct _pthread_rwlock_t
 {
-  pthread_spinlock_t __rw_lock;       /* Lock to guarantee mutual exclusion */
+  struct _pthread_fastlock __rw_lock; /* Lock to guarantee mutual exclusion */
   int __rw_readers;                   /* Number of readers */
   _pthread_descr __rw_writer;         /* Identity of writer, or NULL if none */
   _pthread_descr __rw_read_waiting;   /* Threads waiting for reading */
@@ -115,6 +115,11 @@ typedef struct
 } pthread_rwlockattr_t;
 #endif
 
+#ifdef __USE_XOPEN2K
+/* POSIX spinlock data type.  */
+typedef volatile int pthread_spinlock_t;
+#endif
+
 
 /* Thread identifiers */
 typedef unsigned long int pthread_t;
diff --git a/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c b/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c
new file mode 100644
index 0000000000..ff72ff0c35
--- /dev/null
+++ b/linuxthreads/sysdeps/sparc/sparc32/pspinlock.c
@@ -0,0 +1,66 @@
+/* POSIX spinlock implementation.  SPARC32 version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  XXX
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)
diff --git a/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c b/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c
new file mode 100644
index 0000000000..83edb08bba
--- /dev/null
+++ b/linuxthreads/sysdeps/sparc/sparc64/pspinlock.c
@@ -0,0 +1,66 @@
+/* POSIX spinlock implementation.  SPARC64 version.
+   Copyright (C) 2000 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
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 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
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <pthread.h>
+
+
+int
+__pthread_spin_lock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_lock, pthread_spin_lock)
+
+
+int
+__pthread_spin_trylock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_trylock, pthread_spin_trylock)
+
+
+int
+__pthread_spin_unlock (pthread_spinlock_t *lock)
+{
+  XXX
+}
+weak_alias (__pthread_spin_unlock, pthread_spin_unlock)
+
+
+int
+__pthread_spin_init (pthread_spinlock_t *lock, int pshared)
+{
+  /* We can ignore the `pshared' parameter.  Since we are busy-waiting
+     all processes which can access the memory location `lock' points
+     to can use the spinlock.  */
+  XXX
+  return 0;
+}
+weak_alias (__pthread_spin_init, pthread_spin_init)
+
+
+int
+__pthread_spin_destroy (pthread_spinlock_t *lock)
+{
+  /* Nothing to do.  */
+  return 0;
+}
+weak_alias (__pthread_spin_destroy, pthread_spin_destroy)