1 /* Copyright (C) 2002, 2003, 2007 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>
22 #include <kernel-features.h>
23 #include <lowlevellock.h>
26 .comm __fork_generation, 4, 4
32 .type __pthread_once,@function
43 cfi_adjust_cfa_offset (4)
46 cfi_adjust_cfa_offset (4)
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 #ifdef __ASSUME_PRIVATE_FUTEX
88 movl $FUTEX_WAIT|FUTEX_PRIVATE_FLAG, %ecx
91 movl %gs:PRIVATE_FUTEX, %ecx
93 movl $FUTEX_WAIT, %ecx
94 orl %gs:PRIVATE_FUTEX, %ecx
101 3: /* Call the initializer function after setting up the
102 cancellation handler. Note that it is not possible here
103 to use the unwind-based cleanup handling. This would require
104 that the user-provided function and all the code it calls
105 is compiled with exceptions. Unfortunately this cannot be
107 subl $UNWINDBUFSIZE+8, %esp
108 cfi_adjust_cfa_offset (UNWINDBUFSIZE+8)
109 movl %ecx, %ebx /* PIC register value. */
111 leal 8+UWJMPBUF(%esp), %eax
119 call HIDDEN_JUMPTARGET(__pthread_register_cancel)
121 /* Call the user-provided initialization function. */
122 call *24+UNWINDBUFSIZE(%esp)
124 /* Pop the cleanup handler. */
126 call HIDDEN_JUMPTARGET(__pthread_unregister_cancel)
127 addl $UNWINDBUFSIZE+8, %esp
128 cfi_adjust_cfa_offset (-UNWINDBUFSIZE-8)
130 /* Sucessful run of the initializer. Signal that we are done. */
135 /* Wake up all other threads. */
136 movl $0x7fffffff, %edx
137 #ifdef __ASSUME_PRIVATE_FUTEX
138 movl $FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %ecx
140 movl $FUTEX_WAKE, %ecx
141 orl %gs:PRIVATE_FUTEX, %ecx
143 movl $SYS_futex, %eax
147 cfi_adjust_cfa_offset (-4)
150 cfi_adjust_cfa_offset (-4)
155 7: /* __sigsetjmp returned for the second time. */
156 movl 20+UNWINDBUFSIZE(%esp), %ebx
157 cfi_adjust_cfa_offset (UNWINDBUFSIZE+16)
162 movl $0x7fffffff, %edx
163 #ifdef __ASSUME_PRIVATE_FUTEX
164 movl $FUTEX_WAKE|FUTEX_PRIVATE_FLAG, %ecx
166 movl $FUTEX_WAKE, %ecx
167 orl %gs:PRIVATE_FUTEX, %ecx
169 movl $SYS_futex, %eax
173 call HIDDEN_JUMPTARGET (__pthread_unwind_next)
177 .size __pthread_once,.-__pthread_once
179 .globl __pthread_once_internal
180 __pthread_once_internal = __pthread_once
183 pthread_once = __pthread_once
187 .section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits
188 .globl __i686.get_pc_thunk.cx
189 .hidden __i686.get_pc_thunk.cx
190 .type __i686.get_pc_thunk.cx,@function
191 __i686.get_pc_thunk.cx:
194 .size __i686.get_pc_thunk.cx,.-__i686.get_pc_thunk.cx