nsprpub/pr/src/md/os2/os2emx.s@44a2da4a2ab2 (annotated)
nsprpub/pr/src/md/os2/os2emx.s
Fri, 16 Jan 2015 04:50:19 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Fri, 16 Jan 2015 04:50:19 +0100
- branch
- TOR_BUG_9701
- changeset 13
- 44a2da4a2ab2
- permissions
- -rw-r--r--
Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32
| michael@0 | 1 | / -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | / |
| michael@0 | 3 | / This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 4 | / License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 5 | / file, You can obtain one at http://mozilla.org/MPL/2.0/. |
| michael@0 | 6 | |
| michael@0 | 7 | / PRInt32 __PR_MD_ATOMIC_INCREMENT(PRInt32 *val) |
| michael@0 | 8 | / |
| michael@0 | 9 | / Atomically increment the integer pointed to by 'val' and return |
| michael@0 | 10 | / the result of the increment. |
| michael@0 | 11 | / |
| michael@0 | 12 | .text |
| michael@0 | 13 | .globl __PR_MD_ATOMIC_INCREMENT |
| michael@0 | 14 | .align 4 |
| michael@0 | 15 | __PR_MD_ATOMIC_INCREMENT: |
| michael@0 | 16 | movl 4(%esp), %ecx |
| michael@0 | 17 | movl $1, %eax |
| michael@0 | 18 | lock |
| michael@0 | 19 | xaddl %eax, (%ecx) |
| michael@0 | 20 | incl %eax |
| michael@0 | 21 | ret |
| michael@0 | 22 | |
| michael@0 | 23 | / PRInt32 __PR_MD_ATOMIC_DECREMENT(PRInt32 *val) |
| michael@0 | 24 | / |
| michael@0 | 25 | / Atomically decrement the integer pointed to by 'val' and return |
| michael@0 | 26 | / the result of the decrement. |
| michael@0 | 27 | / |
| michael@0 | 28 | .text |
| michael@0 | 29 | .globl __PR_MD_ATOMIC_DECREMENT |
| michael@0 | 30 | .align 4 |
| michael@0 | 31 | __PR_MD_ATOMIC_DECREMENT: |
| michael@0 | 32 | movl 4(%esp), %ecx |
| michael@0 | 33 | movl $-1, %eax |
| michael@0 | 34 | lock |
| michael@0 | 35 | xaddl %eax, (%ecx) |
| michael@0 | 36 | decl %eax |
| michael@0 | 37 | ret |
| michael@0 | 38 | |
| michael@0 | 39 | / PRInt32 __PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval) |
| michael@0 | 40 | / |
| michael@0 | 41 | / Atomically set the integer pointed to by 'val' to the new |
| michael@0 | 42 | / value 'newval' and return the old value. |
| michael@0 | 43 | / |
| michael@0 | 44 | / An alternative implementation: |
| michael@0 | 45 | / .text |
| michael@0 | 46 | / .globl __PR_MD_ATOMIC_SET |
| michael@0 | 47 | / .align 4 |
| michael@0 | 48 | /__PR_MD_ATOMIC_SET: |
| michael@0 | 49 | / movl 4(%esp), %ecx |
| michael@0 | 50 | / movl 8(%esp), %edx |
| michael@0 | 51 | / movl (%ecx), %eax |
| michael@0 | 52 | /retry: |
| michael@0 | 53 | / lock |
| michael@0 | 54 | / cmpxchgl %edx, (%ecx) |
| michael@0 | 55 | / jne retry |
| michael@0 | 56 | / ret |
| michael@0 | 57 | / |
| michael@0 | 58 | .text |
| michael@0 | 59 | .globl __PR_MD_ATOMIC_SET |
| michael@0 | 60 | .align 4 |
| michael@0 | 61 | __PR_MD_ATOMIC_SET: |
| michael@0 | 62 | movl 4(%esp), %ecx |
| michael@0 | 63 | movl 8(%esp), %eax |
| michael@0 | 64 | xchgl %eax, (%ecx) |
| michael@0 | 65 | ret |
| michael@0 | 66 | |
| michael@0 | 67 | / PRInt32 __PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val) |
| michael@0 | 68 | / |
| michael@0 | 69 | / Atomically add 'val' to the integer pointed to by 'ptr' |
| michael@0 | 70 | / and return the result of the addition. |
| michael@0 | 71 | / |
| michael@0 | 72 | .text |
| michael@0 | 73 | .globl __PR_MD_ATOMIC_ADD |
| michael@0 | 74 | .align 4 |
| michael@0 | 75 | __PR_MD_ATOMIC_ADD: |
| michael@0 | 76 | movl 4(%esp), %ecx |
| michael@0 | 77 | movl 8(%esp), %eax |
| michael@0 | 78 | movl %eax, %edx |
| michael@0 | 79 | lock |
| michael@0 | 80 | xaddl %eax, (%ecx) |
| michael@0 | 81 | addl %edx, %eax |
| michael@0 | 82 | ret |
