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https://github.com/rn10950/RetroZilla.git
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225 lines
6.9 KiB
C
225 lines
6.9 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape Portable Runtime (NSPR).
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/* GLOBAL FUNCTIONS:
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** DESCRIPTION:
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** PR Atomic operations
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*/
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#ifndef pratom_h___
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#define pratom_h___
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#include "prtypes.h"
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#include "prlock.h"
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PR_BEGIN_EXTERN_C
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/*
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** FUNCTION: PR_AtomicIncrement
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** DESCRIPTION:
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** Atomically increment a 32 bit value.
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** INPUTS:
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** val: a pointer to the value to increment
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** RETURN:
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** the returned value is the result of the increment
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*/
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NSPR_API(PRInt32) PR_AtomicIncrement(PRInt32 *val);
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/*
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** FUNCTION: PR_AtomicDecrement
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** DESCRIPTION:
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** Atomically decrement a 32 bit value.
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** INPUTS:
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** val: a pointer to the value to decrement
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** RETURN:
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** the returned value is the result of the decrement
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*/
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NSPR_API(PRInt32) PR_AtomicDecrement(PRInt32 *val);
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/*
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** FUNCTION: PR_AtomicSet
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** DESCRIPTION:
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** Atomically set a 32 bit value.
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** INPUTS:
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** val: A pointer to a 32 bit value to be set
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** newval: The newvalue to assign to val
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** RETURN:
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** Returns the prior value
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*/
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NSPR_API(PRInt32) PR_AtomicSet(PRInt32 *val, PRInt32 newval);
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/*
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** FUNCTION: PR_AtomicAdd
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** DESCRIPTION:
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** Atomically add a 32 bit value.
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** INPUTS:
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** ptr: a pointer to the value to increment
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** val: value to be added
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** RETURN:
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** the returned value is the result of the addition
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*/
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NSPR_API(PRInt32) PR_AtomicAdd(PRInt32 *ptr, PRInt32 val);
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/*
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** MACRO: PR_ATOMIC_INCREMENT
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** MACRO: PR_ATOMIC_DECREMENT
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** MACRO: PR_ATOMIC_SET
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** MACRO: PR_ATOMIC_ADD
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** DESCRIPTION:
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** Macro versions of the atomic operations. They may be implemented
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** as compiler intrinsics.
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**
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** IMPORTANT NOTE TO NSPR MAINTAINERS:
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** Implement these macros with compiler intrinsics only on platforms
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** where the PR_AtomicXXX functions are truly atomic (i.e., where the
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** configuration macro _PR_HAVE_ATOMIC_OPS is defined). Otherwise,
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** the macros and functions won't be compatible and can't be used
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** interchangeably.
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*/
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#if defined(_WIN32) && (_MSC_VER >= 1310)
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long __cdecl _InterlockedIncrement(long volatile *Addend);
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#pragma intrinsic(_InterlockedIncrement)
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long __cdecl _InterlockedDecrement(long volatile *Addend);
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#pragma intrinsic(_InterlockedDecrement)
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long __cdecl _InterlockedExchange(long volatile *Target, long Value);
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#pragma intrinsic(_InterlockedExchange)
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long __cdecl _InterlockedExchangeAdd(long volatile *Addend, long Value);
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#pragma intrinsic(_InterlockedExchangeAdd)
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#define PR_ATOMIC_INCREMENT(val) _InterlockedIncrement(val)
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#define PR_ATOMIC_DECREMENT(val) _InterlockedDecrement(val)
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#define PR_ATOMIC_SET(val, newval) _InterlockedExchange(val, newval)
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#define PR_ATOMIC_ADD(ptr, val) (_InterlockedExchangeAdd(ptr, val) + (val))
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#elif ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && \
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((defined(DARWIN) && \
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(defined(__ppc__) || defined(__i386__))) || \
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(defined(LINUX) && \
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(defined(__i386__) || defined(__ia64__) || defined(__x86_64__) || \
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(defined(__powerpc__) && !defined(__powerpc64__)) || \
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defined(__alpha))))
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/*
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* Because the GCC manual warns that some processors may support
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* reduced functionality of __sync_lock_test_and_set, we test for the
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* processors that we believe support a full atomic exchange operation.
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*/
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#define PR_ATOMIC_INCREMENT(val) __sync_add_and_fetch(val, 1)
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#define PR_ATOMIC_DECREMENT(val) __sync_sub_and_fetch(val, 1)
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#define PR_ATOMIC_SET(val, newval) __sync_lock_test_and_set(val, newval)
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#define PR_ATOMIC_ADD(ptr, val) __sync_add_and_fetch(ptr, val)
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#else
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#define PR_ATOMIC_INCREMENT(val) PR_AtomicIncrement(val)
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#define PR_ATOMIC_DECREMENT(val) PR_AtomicDecrement(val)
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#define PR_ATOMIC_SET(val, newval) PR_AtomicSet(val, newval)
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#define PR_ATOMIC_ADD(ptr, val) PR_AtomicAdd(ptr, val)
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#endif
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/*
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** LIFO linked-list (stack)
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*/
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typedef struct PRStackElemStr PRStackElem;
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struct PRStackElemStr {
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PRStackElem *prstk_elem_next; /* next pointer MUST be at offset 0;
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assembly language code relies on this */
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};
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typedef struct PRStackStr PRStack;
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/*
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** FUNCTION: PR_CreateStack
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** DESCRIPTION:
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** Create a stack, a LIFO linked list
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** INPUTS:
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** stack_name: a pointer to string containing the name of the stack
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** RETURN:
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** A pointer to the created stack, if successful, else NULL.
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*/
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NSPR_API(PRStack *) PR_CreateStack(const char *stack_name);
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/*
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** FUNCTION: PR_StackPush
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** DESCRIPTION:
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** Push an element on the top of the stack
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** INPUTS:
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** stack: pointer to the stack
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** stack_elem: pointer to the stack element
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** RETURN:
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** None
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*/
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NSPR_API(void) PR_StackPush(PRStack *stack, PRStackElem *stack_elem);
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/*
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** FUNCTION: PR_StackPop
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** DESCRIPTION:
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** Remove the element on the top of the stack
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** INPUTS:
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** stack: pointer to the stack
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** RETURN:
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** A pointer to the stack element removed from the top of the stack,
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** if non-empty,
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** else NULL
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*/
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NSPR_API(PRStackElem *) PR_StackPop(PRStack *stack);
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/*
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** FUNCTION: PR_DestroyStack
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** DESCRIPTION:
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** Destroy the stack
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** INPUTS:
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** stack: pointer to the stack
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** RETURN:
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** PR_SUCCESS - if successfully deleted
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** PR_FAILURE - if the stack is not empty
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** PR_GetError will return
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** PR_INVALID_STATE_ERROR - stack is not empty
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*/
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NSPR_API(PRStatus) PR_DestroyStack(PRStack *stack);
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PR_END_EXTERN_C
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#endif /* pratom_h___ */
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