| / -*- 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 |
