1 /* Copyright (C) 2009 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@redhat.com>, 2009.
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
21 #include <tcb-offsets.h>
22 #include <kernel-features.h>
23 #include "lowlevellock.h"
25 #ifdef IS_IN_libpthread
27 # define __pthread_unwind __GI___pthread_unwind
31 .weak __pthread_unwind
36 #ifdef __ASSUME_PRIVATE_FUTEX
37 # define LOAD_PRIVATE_FUTEX_WAIT(reg) \
38 movl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg
41 # define LOAD_PRIVATE_FUTEX_WAIT(reg) \
42 movl %fs:PRIVATE_FUTEX, reg
44 # define LOAD_PRIVATE_FUTEX_WAIT(reg) \
45 movl %fs:PRIVATE_FUTEX, reg ; \
50 /* It is crucial that the functions in this file don't modify registers
51 other than %rax and %r11. The syscall wrapper code depends on this
52 because it doesn't explicitly save the other registers which hold
56 .hidden __pthread_enable_asynccancel
57 ENTRY(__pthread_enable_asynccancel)
58 movl %fs:CANCELHANDLING, %eax
60 orl $TCB_CANCELTYPE_BITMASK, %r11d
65 cmpxchgl %r11d, %fs:CANCELHANDLING
68 andl $(TCB_CANCELSTATE_BITMASK|TCB_CANCELTYPE_BITMASK|TCB_CANCELED_BITMASK|TCB_EXITING_BITMASK|TCB_CANCEL_RESTMASK|TCB_TERMINATED_BITMASK), %r11d
69 cmpl $(TCB_CANCELTYPE_BITMASK|TCB_CANCELED_BITMASK), %r11d
74 3: movq $TCB_PTHREAD_CANCELED, %fs:RESULT
76 orl $TCB_EXITING_BITMASK, %fs:CANCELHANDLING
77 movq %fs:CLEANUP_JMP_BUF, %rdi
79 call __pthread_unwind@PLT
84 END(__pthread_enable_asynccancel)
87 .hidden __pthread_disable_asynccancel
88 ENTRY(__pthread_disable_asynccancel)
89 testl $TCB_CANCELTYPE_BITMASK, %edi
92 movl %fs:CANCELHANDLING, %eax
94 andl $~TCB_CANCELTYPE_BITMASK, %r11d
96 cmpxchgl %r11d, %fs:CANCELHANDLING
100 3: andl $(TCB_CANCELING_BITMASK|TCB_CANCELED_BITMASK), %eax
101 cmpl $TCB_CANCELING_BITMASK, %eax
105 /* Performance doesn't matter in this loop. We will
106 delay until the thread is canceled. And we will unlikely
107 enter the loop twice. */
109 movl $__NR_futex, %eax
111 addq $CANCELHANDLING, %rdi
112 LOAD_PRIVATE_FUTEX_WAIT (%esi)
114 movl %fs:CANCELHANDLING, %eax
116 END(__pthread_disable_asynccancel)