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/ -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
/
/ This Source Code Form is subject to the terms of the Mozilla Public
/ License, v. 2.0. If a copy of the MPL was not distributed with this
/ file, You can obtain one at http://mozilla.org/MPL/2.0/.
/ PRInt32 __PR_MD_ATOMIC_INCREMENT(PRInt32 *val)
/
/ Atomically increment the integer pointed to by 'val' and return
/ the result of the increment.
/
.text
.globl __PR_MD_ATOMIC_INCREMENT
.align 4
__PR_MD_ATOMIC_INCREMENT:
movl 4(%esp), %ecx
movl $1, %eax
lock
xaddl %eax, (%ecx)
incl %eax
ret
/ PRInt32 __PR_MD_ATOMIC_DECREMENT(PRInt32 *val)
/
/ Atomically decrement the integer pointed to by 'val' and return
/ the result of the decrement.
/
.text
.globl __PR_MD_ATOMIC_DECREMENT
.align 4
__PR_MD_ATOMIC_DECREMENT:
movl 4(%esp), %ecx
movl $-1, %eax
lock
xaddl %eax, (%ecx)
decl %eax
ret
/ PRInt32 __PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)
/
/ Atomically set the integer pointed to by 'val' to the new
/ value 'newval' and return the old value.
/
/ An alternative implementation:
/ .text
/ .globl __PR_MD_ATOMIC_SET
/ .align 4
/__PR_MD_ATOMIC_SET:
/ movl 4(%esp), %ecx
/ movl 8(%esp), %edx
/ movl (%ecx), %eax
/retry:
/ lock
/ cmpxchgl %edx, (%ecx)
/ jne retry
/ ret
/
.text
.globl __PR_MD_ATOMIC_SET
.align 4
__PR_MD_ATOMIC_SET:
movl 4(%esp), %ecx
movl 8(%esp), %eax
xchgl %eax, (%ecx)
ret
/ PRInt32 __PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)
/
/ Atomically add 'val' to the integer pointed to by 'ptr'
/ and return the result of the addition.
/
.text
.globl __PR_MD_ATOMIC_ADD
.align 4
__PR_MD_ATOMIC_ADD:
movl 4(%esp), %ecx
movl 8(%esp), %eax
movl %eax, %edx
lock
xaddl %eax, (%ecx)
addl %edx, %eax
ret
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