The Tor Browser: nsprpub/pr/src/md/os2/os2emx.s@4ab42b5ab56c

     1 / -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-

2 /

     3 / This Source Code Form is subject to the terms of the Mozilla Public

     4 / License, v. 2.0. If a copy of the MPL was not distributed with this

     5 / file, You can obtain one at http://mozilla.org/MPL/2.0/.

     7 / PRInt32 __PR_MD_ATOMIC_INCREMENT(PRInt32 *val)

8 /

     9 / Atomically increment the integer pointed to by 'val' and return

    10 / the result of the increment.

    11 /

    12     .text

    13     .globl __PR_MD_ATOMIC_INCREMENT

    14     .align 4

    15 __PR_MD_ATOMIC_INCREMENT:

    16     movl 4(%esp), %ecx

    17     movl $1, %eax

    18     lock

    19     xaddl %eax, (%ecx)

    20     incl %eax

    21     ret

    23 / PRInt32 __PR_MD_ATOMIC_DECREMENT(PRInt32 *val)

    24 /

    25 / Atomically decrement the integer pointed to by 'val' and return

    26 / the result of the decrement.

    27 /

    28     .text

    29     .globl __PR_MD_ATOMIC_DECREMENT

    30     .align 4

    31 __PR_MD_ATOMIC_DECREMENT:

    32     movl 4(%esp), %ecx

    33     movl $-1, %eax

    34     lock

    35     xaddl %eax, (%ecx)

    36     decl %eax

    37     ret

    39 / PRInt32 __PR_MD_ATOMIC_SET(PRInt32 *val, PRInt32 newval)

    40 /

    41 / Atomically set the integer pointed to by 'val' to the new

    42 / value 'newval' and return the old value.

    43 /

    44 / An alternative implementation:

    45 /   .text

    46 /   .globl __PR_MD_ATOMIC_SET

    47 /   .align 4

    48 /__PR_MD_ATOMIC_SET:

    49 /   movl 4(%esp), %ecx

    50 /   movl 8(%esp), %edx

    51 /   movl (%ecx), %eax

    52 /retry:

    53 /   lock

    54 /   cmpxchgl %edx, (%ecx)

    55 /   jne retry

    56 /   ret

    57 /

    58     .text

    59     .globl __PR_MD_ATOMIC_SET

    60     .align 4

    61 __PR_MD_ATOMIC_SET:

    62     movl 4(%esp), %ecx

    63     movl 8(%esp), %eax

    64     xchgl %eax, (%ecx)

    65     ret

    67 / PRInt32 __PR_MD_ATOMIC_ADD(PRInt32 *ptr, PRInt32 val)

    68 /

    69 / Atomically add 'val' to the integer pointed to by 'ptr'

    70 / and return the result of the addition.

    71 /

    72     .text

    73     .globl __PR_MD_ATOMIC_ADD

    74     .align 4

    75 __PR_MD_ATOMIC_ADD:

    76     movl 4(%esp), %ecx

    77     movl 8(%esp), %eax

    78     movl %eax, %edx

    79     lock

    80     xaddl %eax, (%ecx)

    81     addl %edx, %eax

    82     ret

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