/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is the Netscape Portable Runtime (NSPR).
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998-2000 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU General Public License Version 2 or later (the
* "GPL"), in which case the provisions of the GPL are applicable
* instead of those above. If you wish to allow use of your
* version of this file only under the terms of the GPL and not to
* allow others to use your version of this file under the MPL,
* indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by
* the GPL. If you do not delete the provisions above, a recipient
* may use your version of this file under either the MPL or the
* GPL.
*/
/* GLOBAL FUNCTIONS:
** DESCRIPTION:
** PR Atomic operations
*/
#ifndef pratom_h___
#define pratom_h___
#include "prtypes.h"
#include "prlock.h"
PR_BEGIN_EXTERN_C
/*
** FUNCTION: PR_AtomicIncrement
** DESCRIPTION:
** Atomically increment a 32 bit value.
** INPUTS:
** val: a pointer to the value to increment
** RETURN:
** the returned value is the result of the increment
*/
NSPR_API(PRInt32) PR_AtomicIncrement(PRInt32 *val);
/*
** FUNCTION: PR_AtomicDecrement
** DESCRIPTION:
** Atomically decrement a 32 bit value.
** INPUTS:
** val: a pointer to the value to decrement
** RETURN:
** the returned value is the result of the decrement
*/
NSPR_API(PRInt32) PR_AtomicDecrement(PRInt32 *val);
/*
** FUNCTION: PR_AtomicSet
** DESCRIPTION:
** Atomically set a 32 bit value.
** INPUTS:
** val: A pointer to a 32 bit value to be set
** newval: The newvalue to assign to val
** RETURN:
** Returns the prior value
*/
NSPR_API(PRInt32) PR_AtomicSet(PRInt32 *val, PRInt32 newval);
/*
** FUNCTION: PR_AtomicAdd
** DESCRIPTION:
** Atomically add a 32 bit value.
** INPUTS:
** ptr: a pointer to the value to increment
** val: value to be added
** RETURN:
** the returned value is the result of the addition
*/
NSPR_API(PRInt32) PR_AtomicAdd(PRInt32 *ptr, PRInt32 val);
/*
** LIFO linked-list (stack)
*/
typedef struct PRStackElemStr PRStackElem;
struct PRStackElemStr {
PRStackElem *prstk_elem_next; /* next pointer MUST be at offset 0;
assembly language code relies on this */
};
typedef struct PRStackStr PRStack;
/*
** FUNCTION: PR_CreateStack
** DESCRIPTION:
** Create a stack, a LIFO linked list
** INPUTS:
** stack_name: a pointer to string containing the name of the stack
** RETURN:
** A pointer to the created stack, if successful, else NULL.
*/
NSPR_API(PRStack *) PR_CreateStack(const char *stack_name);
/*
** FUNCTION: PR_StackPush
** DESCRIPTION:
** Push an element on the top of the stack
** INPUTS:
** stack: pointer to the stack
** stack_elem: pointer to the stack element
** RETURN:
** None
*/
NSPR_API(void) PR_StackPush(PRStack *stack, PRStackElem *stack_elem);
/*
** FUNCTION: PR_StackPop
** DESCRIPTION:
** Remove the element on the top of the stack
** INPUTS:
** stack: pointer to the stack
** RETURN:
** A pointer to the stack element removed from the top of the stack,
** if non-empty,
** else NULL
*/
NSPR_API(PRStackElem *) PR_StackPop(PRStack *stack);
/*
** FUNCTION: PR_DestroyStack
** DESCRIPTION:
** Destroy the stack
** INPUTS:
** stack: pointer to the stack
** RETURN:
** PR_SUCCESS - if successfully deleted
** PR_FAILURE - if the stack is not empty
** PR_GetError will return
** PR_INVALID_STATE_ERROR - stack is not empty
*/
NSPR_API(PRStatus) PR_DestroyStack(PRStack *stack);
PR_END_EXTERN_C
#endif /* pratom_h___ */