1 /* Copyright (C) 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
31 .comm __fork_generation, 4, 4
37 .type __pthread_once,@function
51 /* Not yet initialized or initialization in progress.
52 Get the fork generation counter now. */
55 call __i686.get_pc_thunk.cx
56 addl $_GLOBAL_OFFSET_TABLE_, %ecx
66 orl __fork_generation@GOTOFF(%ecx), %edx
68 orl __fork_generation, %edx
76 /* Check whether another thread already runs the initializer. */
78 jz 3f /* No -> do it. */
80 /* Check whether the initializer execution was interrupted
83 testl $0xfffffffc, %eax
84 jnz 3f /* Different for generation -> run initializer. */
86 /* Somebody else got here first. Wait. */
87 movl %esi, %ecx /* movl $FUTEX_WAIT, %ecx */
92 3: /* Call the initializer function after setting up the
93 cancellation handler. */
96 /* Push the cleanup handler. */
98 leal clear_once_control@GOTOFF(%ecx), %eax
100 leal clear_once_control, %eax
106 call _GI_pthread_cleanup_push /* Note: no @PLT. */
111 /* Pop the cleanup handler. This code depends on the once
112 handler and _pthread_cleanup_push not touch the content
113 of the stack. Otherwise the first parameter would have
116 call _GI_pthread_cleanup_pop /* Note: no @PLT. */
120 /* Sucessful run of the initializer. Signal that we are done. */
124 /* Wake up all other threads. */
125 movl $0x7fffffff, %edx
126 movl $FUTEX_WAKE, %ecx
127 movl $SYS_futex, %eax
135 .size __pthread_once,.-__pthread_once
138 pthread_once = __pthread_once
141 .type clear_once_control,@function
151 movl $0x7fffffff, %edx
152 movl $FUTEX_WAKE, %ecx
153 movl $SYS_futex, %eax
159 .size clear_once_control,.-clear_once_control
163 .section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits
164 .globl __i686.get_pc_thunk.cx
165 .hidden __i686.get_pc_thunk.cx
166 .type __i686.get_pc_thunk.cx,@function
167 __i686.get_pc_thunk.cx:
170 .size __i686.get_pc_thunk.cx,.-__i686.get_pc_thunk.cx