--- /dev/null
+/* Copyright (C) 2002 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _BITS_PTHREADTYPES_H
+#define _BITS_PTHREADTYPES_H 1
+
+#define __SIZEOF_PTHREAD_ATTR_T 56
+#define __SIZEOF_PTHREAD_MUTEX_T 40
+#define __SIZEOF_PTHREAD_MUTEXATTR_T 4
+#define __SIZEOF_PTHREAD_COND_T 24
+#define __SIZEOF_PTHREAD_CONDATTR_T 4
+#define __SIZEOF_PTHREAD_RWLOCK_T 56
+#define __SIZEOF_PTHREAD_RWLOCKATTR_T 8
+#define __SIZEOF_PTHREAD_BARRIER_T 32
+#define __SIZEOF_PTHREAD_BARRIERATTR_T 4
+
+
+/* Thread identifiers. The structure of the attribute type is not
+ exposed on purpose. */
+typedef unsigned long int pthread_t;
+
+
+typedef union
+{
+ char __size[__SIZEOF_PTHREAD_ATTR_T];
+ long int __align;
+} pthread_attr_t;
+
+
+/* Data structures for mutex handling. The structure of the attribute
+ type is not exposed on purpose. */
+typedef union
+{
+ struct
+ {
+ int __lock;
+ unsigned int __count;
+ struct pthread *__owner;
+ /* KIND must stay at this position in the structure to maintain
+ binary compatibility. */
+ int __kind;
+ } __data;
+ char __size[__SIZEOF_PTHREAD_MUTEX_T];
+ long int __align;
+} pthread_mutex_t;
+
+typedef union
+{
+ char __size[__SIZEOF_PTHREAD_MUTEXATTR_T];
+ long int __align;
+} pthread_mutexattr_t;
+
+
+/* Data structure for conditional variable handling. The structure of
+ the attribute type is not exposed on purpose. */
+typedef union
+{
+ struct
+ {
+ int __lock;
+ unsigned int __nr_wakers;
+ unsigned int __nr_sleepers;
+ } __data;
+ char __size[__SIZEOF_PTHREAD_COND_T];
+ long int __align;
+} pthread_cond_t;
+
+typedef union
+{
+ char __size[__SIZEOF_PTHREAD_CONDATTR_T];
+ long int __align;
+} pthread_condattr_t;
+
+
+/* Keys for thread-specific data */
+typedef unsigned int pthread_key_t;
+
+
+/* Once-only execution */
+typedef int pthread_once_t;
+
+
+#ifdef __USE_UNIX98
+/* Data structure for read-write lock variable handling. The
+ structure of the attribute type is not exposed on purpose. */
+typedef union
+{
+ struct
+ {
+ int __lock;
+ unsigned int __nr_readers;
+ unsigned int __readers_wakeup;
+ unsigned int __writer_wakeup;
+ unsigned int __nr_readers_queued;
+ unsigned int __nr_writers_queued;
+ pthread_t __writer;
+ unsigned long int __unused;
+ /* FLAGS must stay at this position in the structure to maintain
+ binary compatibility. */
+ unsigned int __flags;
+ } __data;
+ char __size[__SIZEOF_PTHREAD_RWLOCK_T];
+ long int __align;
+} pthread_rwlock_t;
+
+typedef union
+{
+ char __size[__SIZEOF_PTHREAD_RWLOCKATTR_T];
+ long int __align;
+} pthread_rwlockattr_t;
+#endif
+
+
+#ifdef __USE_XOPEN2K
+/* POSIX spinlock data type. */
+typedef volatile int pthread_spinlock_t;
+
+
+/* POSIX barriers data type. The structure of the type is
+ deliberately not exposed. */
+typedef union
+{
+ char __size[__SIZEOF_PTHREAD_BARRIER_T];
+ long int __align;
+} pthread_barrier_t;
+
+typedef union
+{
+ char __size[__SIZEOF_PTHREAD_BARRIERATTR_T];
+ int __align;
+} pthread_barrierattr_t;
+#endif
+
+
+#endif /* bits/pthreadtypes.h */
--- /dev/null
+/* Copyright (C) 2002 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, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef UP
+# define LOCK lock
+#else
+# define LOCK
+#endif
+
+#define SYS_futex 202
+#define FUTEX_WAKE 1
+
+ .comm __fork_generation, 4, 4
+
+ .text
+
+
+ .globl __pthread_once
+ .type __pthread_once,@function
+ .align 16
+__pthread_once:
+ testl $2, (%rdi)
+ jz 1f
+ xorl %eax, %eax
+0: ret
+
+1: xorq %rsi, %rsi
+
+ /* Not yet initialized or initialization in progress.
+ Get the fork generation counter now. */
+6: movl (%rdi), %eax
+
+5: movq %rax, %rdx
+
+ testl $2, %eax
+ jnz 0b
+
+ andl $3, %edx
+ orl __fork_generation(%rip), %edx
+ orl $1, %edx
+
+ LOCK
+ cmpxchgl %edx, (%rdi)
+ jnz 5b
+
+ /* Check whether another thread already runs the initializer. */
+ testl $1, %eax
+ jz 3f /* No -> do it. */
+
+ /* Check whether the initializer execution was interrupted
+ by a fork. */
+ xorl %edx, %eax
+ testl $0xfffffffc, %eax
+ jnz 3f /* Different for generation -> run initializer. */
+
+ /* Somebody else got here first. Wait. */
+ movq %rsi, %rcx /* movl $FUTEX_WAIT, %ecx */
+ movl $SYS_futex, %eax
+ syscall
+ jmp 6b
+
+ /* Preserve the pointer to the control variable. */
+3: pushq %rdi
+
+ /* Call the initializer function after setting up the
+ cancellation handler. */
+ subq $32, %rsp
+
+ /* Push the cleanup handler. */
+ leaq clear_once_control(%rip), %rsi
+ movq %rdi, %rdx
+ movq %rsp, %rdi
+ call _GI_pthread_cleanup_push /* Note: no @PLT. */
+
+ movq 48(%rsp), %rax
+ call *%rax
+
+ /* Pop the cleanup handler. This code depends on the once
+ handler and _pthread_cleanup_push not touch the content
+ of the stack. Otherwise the first parameter would have
+ to be reloaded. */
+ xorq %rdi, %rdi
+ call _GI_pthread_cleanup_pop /* Note: no @PLT. */
+
+ addq $32, %rsp
+
+ /* Get the control variable address back. */
+ popq %rdi
+
+ /* Sucessful run of the initializer. Signal that we are done. */
+ LOCK
+ incl (%rdi)
+
+ /* Wake up all other threads. */
+ movl $0x7fffffff, %edx
+ movl $FUTEX_WAKE, %esi
+ xorq %rcx, %rcx
+ movl $SYS_futex, %eax
+ syscall
+
+4: xorq %rax, %rax
+ ret
+
+ .size __pthread_once,.-__pthread_once
+
+ .globl pthread_once
+pthread_once = __pthread_once
+
+
+ .type clear_once_control,@function
+ .align 16
+clear_once_control:
+ movl $0, (%rdi)
+
+ xorq %rcx, %rcx
+ movl $0x7fffffff, %edx
+ movl $FUTEX_WAKE, %esi
+ movl $SYS_futex, %eax
+ syscall
+
+ ret
+ .size clear_once_control,.-clear_once_control
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