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/* -*- 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/. */ /* 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); /* ** MACRO: PR_ATOMIC_INCREMENT ** MACRO: PR_ATOMIC_DECREMENT ** MACRO: PR_ATOMIC_SET ** MACRO: PR_ATOMIC_ADD ** DESCRIPTION: ** Macro versions of the atomic operations. They may be implemented ** as compiler intrinsics. ** ** IMPORTANT NOTE TO NSPR MAINTAINERS: ** Implement these macros with compiler intrinsics only on platforms ** where the PR_AtomicXXX functions are truly atomic (i.e., where the ** configuration macro _PR_HAVE_ATOMIC_OPS is defined). Otherwise, ** the macros and functions won't be compatible and can't be used ** interchangeably. */ #if defined(_WIN32) && !defined(_WIN32_WCE) && \ (!defined(_MSC_VER) || (_MSC_VER >= 1310)) #include <intrin.h> #ifdef _MSC_VER #pragma intrinsic(_InterlockedIncrement) #pragma intrinsic(_InterlockedDecrement) #pragma intrinsic(_InterlockedExchange) #pragma intrinsic(_InterlockedExchangeAdd) #endif #define PR_ATOMIC_INCREMENT(val) _InterlockedIncrement((long volatile *)(val)) #define PR_ATOMIC_DECREMENT(val) _InterlockedDecrement((long volatile *)(val)) #define PR_ATOMIC_SET(val, newval) \ _InterlockedExchange((long volatile *)(val), (long)(newval)) #define PR_ATOMIC_ADD(ptr, val) \ (_InterlockedExchangeAdd((long volatile *)(ptr), (long)(val)) + (val)) #elif ((__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 1)) && \ ((defined(__APPLE__) && \ (defined(__ppc__) || defined(__i386__) || defined(__x86_64__))) || \ (defined(__linux__) && \ ((defined(__i386__) && \ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \ defined(__ia64__) || defined(__x86_64__) || \ defined(__powerpc__) || \ (defined(__arm__) && \ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4)) || \ defined(__aarch64__) || defined(__alpha) || \ (defined(__mips__) && \ defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4))))) /* * Because the GCC manual warns that some processors may support * reduced functionality of __sync_lock_test_and_set, we test for the * processors that we believe support a full atomic exchange operation. */ #define PR_ATOMIC_INCREMENT(val) __sync_add_and_fetch(val, 1) #define PR_ATOMIC_DECREMENT(val) __sync_sub_and_fetch(val, 1) #define PR_ATOMIC_SET(val, newval) __sync_lock_test_and_set(val, newval) #define PR_ATOMIC_ADD(ptr, val) __sync_add_and_fetch(ptr, val) #else #define PR_ATOMIC_INCREMENT(val) PR_AtomicIncrement(val) #define PR_ATOMIC_DECREMENT(val) PR_AtomicDecrement(val) #define PR_ATOMIC_SET(val, newval) PR_AtomicSet(val, newval) #define PR_ATOMIC_ADD(ptr, val) PR_AtomicAdd(ptr, val) #endif /* ** 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___ */