diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelcond.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelcond.S | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelcond.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelcond.S new file mode 100644 index 0000000000..9e2b9fec8d --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelcond.S @@ -0,0 +1,279 @@ +/* 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. */ + +#include <sysdep.h> + + .text + +#ifdef UP +# define LOCK +#else +# define LOCK lock +#endif + +#define SYS_gettimeofday __NR_gettimeofday +#define SYS_futex 240 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + +#define EWOULDBLOCK 11 +#define EINVAL 22 +#define ETIMEDOUT 110 + +#define cond_lock 0 +#define cond_nr_wakers 4 +#define cond_nr_sleepers 8 + + + .global __lll_cond_wait + .type __lll_cond_wait,@function + .hidden __lll_cond_wait + .align 16 +__lll_cond_wait: + pushl %esi + pushl %ebx + + xorl %esi, %esi + + leal cond_nr_wakers(%eax), %ebx + +4: movl (%ebx), %edx + testl %edx, %edx + jne 1f + + LOCK + decl cond_lock-cond_nr_wakers(%ebx) + jne 2f + +3: xorl %ecx, %ecx + movl $SYS_futex, %eax + int $0x80 + + movl $1, %eax + LOCK + xaddl %eax, cond_lock-cond_nr_wakers(%ebx) + testl %eax, %eax + je 4b + + leal cond_lock-cond_nr_wakers(%ebx), %ecx + /* Preserves %ebx, %edx, %edi, %esi. */ + call __lll_mutex_lock_wait + jmp 4b + +1: decl (%ebx) + + popl %ebx + popl %esi + ret + +2: leal cond_lock-cond_nr_wakers(%ebx), %eax + /* Preserves %ebx, %ecx, %edx, %edi, %esi. */ + call __lll_mutex_unlock_wake + jmp 3b + .size __lll_cond_wait,.-__lll_cond_wait + + + .global __lll_cond_timedwait + .type __lll_cond_timedwait,@function + .hidden __lll_cond_timedwait + .align 16 +__lll_cond_timedwait: + /* Check for a valid timeout value. */ + cmpl $1000000000, 4(%edx) + jae 1f + + pushl %ebp + pushl %edi + pushl %esi + pushl %ebx + + /* Stack frame for the timespec and timeval structs. */ + subl $8, %esp + + leal cond_nr_wakers(%eax), %ebp /* cond */ + movl %edx, %edi /* timeout */ + +9: movl (%ebp), %esi + testl %esi, %esi + jne 5f + + LOCK + decl cond_lock-cond_nr_wakers(%ebp) + jne 6f + + /* Get current time. */ +7: movl %esp, %ebx + xorl %ecx, %ecx + movl $SYS_gettimeofday, %eax + int $0x80 + + /* Compute relative timeout. */ + movl 4(%esp), %eax + movl $1000, %edx + mul %edx /* Milli seconds to nano seconds. */ + movl (%edi), %ecx + movl 4(%edi), %edx + subl (%esp), %ecx + subl %eax, %edx + jns 3f + addl $1000000000, %edx + decl %ecx +3: testl %ecx, %ecx + js 4f /* Time is already up. */ + + movl %ecx, (%esp) /* Store relative timeout. */ + movl %edx, 4(%esp) + movl %esi, %edx + movl %esp, %esi + xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ + movl %ebp, %ebx + movl $SYS_futex, %eax + int $0x80 + + movl %eax, %edx + + movl $1, %eax + LOCK + xaddl %eax, cond_lock-cond_nr_wakers(%ebp) + testl %eax, %eax + jne 8f + + cmpl $-ETIMEDOUT, %edx + jne 9b + +4: movl $ETIMEDOUT, %eax + jmp 2f + +5: decl (%ebp) + xorl %eax, %eax + +2: addl $8, %esp + popl %ebx + popl %esi + popl %edi + popl %ebp + ret + +6: leal cond_lock-cond_nr_wakers(%ebp), %eax + /* Preserves %ebx, %ecx, %edx, %edi, %esi. */ + call __lll_mutex_unlock_wake + jmp 7b + +8: leal cond_lock-cond_nr_wakers(%ebp), %ecx + /* Preserves %ebx, %edx, %edi, %esi. */ + call __lll_mutex_lock_wait + jmp 5b + +1: movl $EINVAL, %eax + ret + .size __lll_cond_timedwait,.-__lll_cond_timedwait + + + .global __lll_cond_wake + .type __lll_cond_wake,@function + .hidden __lll_cond_wake + .align 16 +__lll_cond_wake: + pushl %esi + pushl %ebx + + movl %eax, %ebx + + movl $1, %eax + LOCK + xaddl %eax, (%ebx) + testl %eax, %eax + jne 1f + +2: leal cond_nr_wakers(%ebx), %ebx + cmpl $0, cond_nr_sleepers-cond_nr_wakers(%ebx) + je 3f + + incl (%ebx) + jz 5f + +6: movl $FUTEX_WAKE, %ecx + xorl %esi, %esi + movl %ecx, %edx /* movl $1, %edx */ + movl $SYS_futex, %eax + int $0x80 + +3: LOCK + decl cond_lock-cond_nr_wakers(%ebx) + je,pt 4f + + leal cond_lock-cond_nr_wakers(%ebx), %eax + call __lll_mutex_unlock_wake + +4: popl %ebx + popl %esi + ret + +1: movl %ebx, %ecx + call __lll_mutex_lock_wait + jmp 2b + +5: movl $0x80000000, (%ebx) + jmp 6b + .size __lll_cond_wake,.-__lll_cond_wake + + + .global __lll_cond_broadcast + .type __lll_cond_broadcast,@function + .hidden __lll_cond_broadcast + .align 16 +__lll_cond_broadcast: + pushl %esi + pushl %ebx + + movl %eax, %ebx + movl $0x8000000, %edx + + movl $1, %eax + LOCK + xaddl %eax, (%ebx) + testl %eax, %eax + jne 1f + +2: leal cond_nr_wakers(%ebx), %ebx + cmpl $0, cond_nr_sleepers-cond_nr_wakers(%ebx) + je 3f + + orl %edx, (%ebx) + +6: movl $FUTEX_WAKE, %ecx + xorl %esi, %esi + movl $SYS_futex, %eax + int $0x80 + +3: LOCK + decl cond_lock-cond_nr_wakers(%ebx) + je,pt 4f + + leal cond_lock-cond_nr_wakers(%ebx), %eax + call __lll_mutex_unlock_wake + +4: popl %ebx + popl %esi + ret + +1: movl %ebx, %ecx + call __lll_mutex_lock_wait + jmp 2b + .size __lll_cond_broadcast,.-__lll_cond_broadcast |