1 /* Copyright (C) 2002, 2003 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
20 #include <unwindbuf.h>
31 .comm __fork_generation, 4, 4
37 .type __pthread_once,@function
48 cfi_adjust_cfa_offset (4)
51 cfi_adjust_cfa_offset (4)
56 /* Not yet initialized or initialization in progress.
57 Get the fork generation counter now. */
60 call __x86.get_pc_thunk.cx
61 addl $_GLOBAL_OFFSET_TABLE_, %ecx
71 orl __fork_generation@GOTOFF(%ecx), %edx
73 orl __fork_generation, %edx
81 /* Check whether another thread already runs the initializer. */
83 jz 3f /* No -> do it. */
85 /* Check whether the initializer execution was interrupted
88 testl $0xfffffffc, %eax
89 jnz 3f /* Different for generation -> run initializer. */
91 /* Somebody else got here first. Wait. */
92 movl %esi, %ecx /* movl $FUTEX_WAIT, %ecx */
97 3: /* Call the initializer function after setting up the
98 cancellation handler. Note that it is not possible here
99 to use the unwind-based cleanup handling. This would require
100 that the user-provided function and all the code it calls
101 is compiled with exceptions. Unfortunately this cannot be
103 subl $UNWINDBUFSIZE+8, %esp
104 cfi_adjust_cfa_offset (UNWINDBUFSIZE+8)
105 movl %ecx, %ebx /* PIC register value. */
107 leal 8+UWJMPBUF(%esp), %eax
115 call HIDDEN_JUMPTARGET(__pthread_register_cancel)
117 /* Call the user-provided initialization function. */
118 call *24+UNWINDBUFSIZE(%esp)
120 /* Pop the cleanup handler. */
122 call HIDDEN_JUMPTARGET(__pthread_unregister_cancel)
123 addl $UNWINDBUFSIZE+8, %esp
124 cfi_adjust_cfa_offset (-UNWINDBUFSIZE-8)
126 /* Sucessful run of the initializer. Signal that we are done. */
131 /* Wake up all other threads. */
132 movl $0x7fffffff, %edx
133 movl $FUTEX_WAKE, %ecx
134 movl $SYS_futex, %eax
138 cfi_adjust_cfa_offset (-4)
141 cfi_adjust_cfa_offset (-4)
146 7: /* __sigsetjmp returned for the second time. */
147 movl 20+UNWINDBUFSIZE(%esp), %ebx
148 cfi_adjust_cfa_offset (UNWINDBUFSIZE+16)
153 movl $0x7fffffff, %edx
154 movl $FUTEX_WAKE, %ecx
155 movl $SYS_futex, %eax
159 call HIDDEN_JUMPTARGET (__pthread_unwind_next)
163 .size __pthread_once,.-__pthread_once
165 .globl __pthread_once_internal
166 __pthread_once_internal = __pthread_once
169 pthread_once = __pthread_once
173 .section .gnu.linkonce.t.__x86.get_pc_thunk.cx,"ax",@progbits
174 .globl __x86.get_pc_thunk.cx
175 .hidden __x86.get_pc_thunk.cx
176 .type __x86.get_pc_thunk.cx,@function
177 __x86.get_pc_thunk.cx:
180 .size __x86.get_pc_thunk.cx,.-__x86.get_pc_thunk.cx