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Diffstat (limited to 'rubbos/app/httpd-2.0.64/srclib/apr/include/apr_atomic.h')
| -rw-r--r-- | rubbos/app/httpd-2.0.64/srclib/apr/include/apr_atomic.h | 314 |
1 files changed, 0 insertions, 314 deletions
diff --git a/rubbos/app/httpd-2.0.64/srclib/apr/include/apr_atomic.h b/rubbos/app/httpd-2.0.64/srclib/apr/include/apr_atomic.h deleted file mode 100644 index 87889292..00000000 --- a/rubbos/app/httpd-2.0.64/srclib/apr/include/apr_atomic.h +++ /dev/null @@ -1,314 +0,0 @@ -/* Licensed to the Apache Software Foundation (ASF) under one or more - * contributor license agreements. See the NOTICE file distributed with - * this work for additional information regarding copyright ownership. - * The ASF licenses this file to You under the Apache License, Version 2.0 - * (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.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#ifndef APR_ATOMIC_H -#define APR_ATOMIC_H - -/** - * @file apr_atomic.h - * @brief APR Atomic Operations - */ - -#include "apr.h" -#include "apr_pools.h" - -/* Platform includes for atomics */ -#if defined(NETWARE) || defined(__MVS__) /* OS/390 */ -#include <stdlib.h> -#elif defined(__FreeBSD__) -#include <machine/atomic.h> -#endif - -#ifdef __cplusplus -extern "C" { -#endif - -/** - * @defgroup apr_atomic Atomic Operations - * @ingroup APR - * @{ - */ - -/* easiest way to get these documented for the moment */ -#if defined(DOXYGEN) -/** - * structure for holding a atomic value. - * this number >only< has a 24 bit size on some platforms - */ -typedef apr_atomic_t; - -/** - * this function is required on some platforms to initialize the - * atomic operation's internal structures - * @param p pool - * @return APR_SUCCESS on successful completion - */ -apr_status_t apr_atomic_init(apr_pool_t *p); -/** - * read the value stored in a atomic variable - * @param mem the pointer - * @warning on certain platforms this number is not stored - * directly in the pointer. in others it is - */ -apr_uint32_t apr_atomic_read(volatile apr_atomic_t *mem); -/** - * set the value for atomic. - * @param mem the pointer - * @param val the value - */ -void apr_atomic_set(volatile apr_atomic_t *mem, apr_uint32_t val); -/** - * Add 'val' to the atomic variable - * @param mem pointer to the atomic value - * @param val the addition - */ -void apr_atomic_add(volatile apr_atomic_t *mem, apr_uint32_t val); - -/** - * increment the atomic variable by 1 - * @param mem pointer to the atomic value - */ -void apr_atomic_inc(volatile apr_atomic_t *mem); - -/** - * decrement the atomic variable by 1 - * @param mem pointer to the atomic value - * @return zero if the value is zero, otherwise non-zero - */ -int apr_atomic_dec(volatile apr_atomic_t *mem); - -/** - * compare the atomic's value with cmp. - * If they are the same swap the value with 'with' - * @param mem pointer to the atomic value - * @param with what to swap it with - * @param cmp the value to compare it to - * @return the old value of the atomic - * @warning do not mix apr_atomic's with the CAS function. - * on some platforms they may be implemented by different mechanisms - */ -apr_uint32_t apr_atomic_cas(volatile apr_uint32_t *mem, long with, long cmp); - -/** - * compare the pointer's value with cmp. - * If they are the same swap the value with 'with' - * @param mem pointer to the pointer - * @param with what to swap it with - * @param cmp the value to compare it to - * @return the old value of the pointer - */ -void *apr_atomic_casptr(volatile void **mem, void *with, const void *cmp); -#else /* !DOXYGEN */ - -/* The following definitions provide optimized, OS-specific - * implementations of the APR atomic functions on various - * platforms. Any atomic operation that isn't redefined as - * a macro here will be declared as a function later, and - * apr_atomic.c will provide a mutex-based default implementation. - */ - -#if defined(WIN32) - -#define apr_atomic_t LONG - -#define apr_atomic_add(mem, val) InterlockedExchangeAdd(mem,val) -#define apr_atomic_dec(mem) InterlockedDecrement(mem) -#define apr_atomic_inc(mem) InterlockedIncrement(mem) -#define apr_atomic_set(mem, val) InterlockedExchange(mem, val) -#define apr_atomic_read(mem) (*mem) -#define apr_atomic_cas(mem,with,cmp) InterlockedCompareExchange(mem,with,cmp) -#define apr_atomic_init(pool) APR_SUCCESS -#define apr_atomic_casptr(mem,with,cmp) InterlockedCompareExchangePointer(mem,with,cmp) - -#elif defined(NETWARE) - -#define apr_atomic_t unsigned long - -#define apr_atomic_add(mem, val) atomic_add(mem,val) -#define apr_atomic_inc(mem) atomic_inc(mem) -#define apr_atomic_set(mem, val) (*mem = val) -#define apr_atomic_read(mem) (*mem) -#define apr_atomic_init(pool) APR_SUCCESS -#define apr_atomic_cas(mem,with,cmp) atomic_cmpxchg((unsigned long *)(mem),(unsigned long)(cmp),(unsigned long)(with)) - -int apr_atomic_dec(apr_atomic_t *mem); -void *apr_atomic_casptr(void **mem, void *with, const void *cmp); -#define APR_OVERRIDE_ATOMIC_DEC 1 -#define APR_OVERRIDE_ATOMIC_CASPTR 1 - -inline int apr_atomic_dec(apr_atomic_t *mem) -{ - return (atomic_xchgadd(mem, 0xFFFFFFFF) - 1); -} - -inline void *apr_atomic_casptr(void **mem, void *with, const void *cmp) -{ - return (void*)atomic_cmpxchg((unsigned long *)mem,(unsigned long)cmp,(unsigned long)with); -} - -#elif defined(__FreeBSD__) - -#define apr_atomic_t apr_uint32_t -#define apr_atomic_add(mem, val) (atomic_add_int(mem,val),mem) -#define apr_atomic_dec(mem) (atomic_subtract_int(mem,1),mem) -#define apr_atomic_inc(mem) (atomic_add_int(mem,1),mem) -#define apr_atomic_set(mem, val) (atomic_set_int(mem, val),mem) -#define apr_atomic_read(mem) (*mem) - -#elif (defined(__linux__) || defined(__EMX__)) && defined(__i386__) && !APR_FORCE_ATOMIC_GENERIC - -#define apr_atomic_t apr_uint32_t -#define apr_atomic_cas(mem,with,cmp) \ -({ apr_atomic_t prev; \ - asm volatile ("lock; cmpxchgl %1, %2" \ - : "=a" (prev) \ - : "r" (with), "m" (*(mem)), "0"(cmp) \ - : "memory"); \ - prev;}) - -#define apr_atomic_add(mem, val) \ -({ register apr_atomic_t last; \ - do { \ - last = *(mem); \ - } while (apr_atomic_cas((mem), last + (val), last) != last); \ - }) - -#define apr_atomic_dec(mem) \ -({ register apr_atomic_t last; \ - do { \ - last = *(mem); \ - } while (apr_atomic_cas((mem), last - 1, last) != last); \ - (--last != 0); }) - -#define apr_atomic_inc(mem) \ -({ register apr_atomic_t last; \ - do { \ - last = *(mem); \ - } while (apr_atomic_cas((mem), last + 1, last) != last); \ - }) - -#define apr_atomic_set(mem, val) (*(mem) = val) -#define apr_atomic_read(mem) (*(mem)) -#define apr_atomic_init(pool) APR_SUCCESS - -#elif defined(__MVS__) /* OS/390 */ - -#define apr_atomic_t cs_t - -apr_int32_t apr_atomic_add(volatile apr_atomic_t *mem, apr_int32_t val); -apr_uint32_t apr_atomic_cas(volatile apr_atomic_t *mem, apr_uint32_t swap, - apr_uint32_t cmp); -#define APR_OVERRIDE_ATOMIC_ADD 1 -#define APR_OVERRIDE_ATOMIC_CAS 1 - -#define apr_atomic_inc(mem) apr_atomic_add(mem, 1) -#define apr_atomic_dec(mem) apr_atomic_add(mem, -1) -#define apr_atomic_init(pool) APR_SUCCESS - -/* warning: the following two operations, _read and _set, are atomic - * if the memory variables are aligned (the usual case). - * - * If you try really hard and manage to mis-align them, they are not - * guaranteed to be atomic on S/390. But then your program will blow up - * with SIGBUS on a sparc, or with a S0C6 abend if you use the mis-aligned - * variables with other apr_atomic_* operations on OS/390. - */ - -#define apr_atomic_read(p) (*p) -#define apr_atomic_set(mem, val) (*mem = val) - -#endif /* end big if-elseif switch for platform-specifics */ - - -/* Default implementation of the atomic API - * The definitions above may override some or all of the - * atomic functions with optimized, platform-specific versions. - * Any operation that hasn't been overridden as a macro above - * is declared as a function here, unless APR_OVERRIDE_ATOMIC_[OPERATION] - * is defined. (The purpose of the APR_OVERRIDE_ATOMIC_* is - * to allow a platform to declare an apr_atomic_*() function - * with a different signature than the default.) - */ - -#if !defined(apr_atomic_t) -#define apr_atomic_t apr_uint32_t -#endif - -#if !defined(apr_atomic_init) && !defined(APR_OVERRIDE_ATOMIC_INIT) -apr_status_t apr_atomic_init(apr_pool_t *p); -#endif - -#if !defined(apr_atomic_read) && !defined(APR_OVERRIDE_ATOMIC_READ) -#define apr_atomic_read(p) *p -#endif - -#if !defined(apr_atomic_set) && !defined(APR_OVERRIDE_ATOMIC_SET) -void apr_atomic_set(volatile apr_atomic_t *mem, apr_uint32_t val); -#define APR_ATOMIC_NEED_DEFAULT_INIT 1 -#endif - -#if !defined(apr_atomic_add) && !defined(APR_OVERRIDE_ATOMIC_ADD) -void apr_atomic_add(volatile apr_atomic_t *mem, apr_uint32_t val); -#define APR_ATOMIC_NEED_DEFAULT_INIT 1 -#endif - -#if !defined(apr_atomic_inc) && !defined(APR_OVERRIDE_ATOMIC_INC) -void apr_atomic_inc(volatile apr_atomic_t *mem); -#define APR_ATOMIC_NEED_DEFAULT_INIT 1 -#endif - -#if !defined(apr_atomic_dec) && !defined(APR_OVERRIDE_ATOMIC_DEC) -int apr_atomic_dec(volatile apr_atomic_t *mem); -#define APR_ATOMIC_NEED_DEFAULT_INIT 1 -#endif - -#if !defined(apr_atomic_cas) && !defined(APR_OVERRIDE_ATOMIC_CAS) -apr_uint32_t apr_atomic_cas(volatile apr_uint32_t *mem,long with,long cmp); -#define APR_ATOMIC_NEED_DEFAULT_INIT 1 -#endif - -#if !defined(apr_atomic_casptr) && !defined(APR_OVERRIDE_ATOMIC_CASPTR) -#if APR_SIZEOF_VOIDP == 4 -#define apr_atomic_casptr(mem, with, cmp) (void *)apr_atomic_cas((apr_uint32_t *)(mem), (long)(with), (long)cmp) -#else -void *apr_atomic_casptr(volatile void **mem, void *with, const void *cmp); -#define APR_ATOMIC_NEED_DEFAULT_INIT 1 -#endif -#endif - -#ifndef APR_ATOMIC_NEED_DEFAULT_INIT -#define APR_ATOMIC_NEED_DEFAULT_INIT 0 -#endif - -/* If we're using the default versions of any of the atomic functions, - * we'll need the atomic init to set up mutexes. If a platform-specific - * override above has replaced the atomic_init with a macro, it's an error. - */ -#if APR_ATOMIC_NEED_DEFAULT_INIT -#if defined(apr_atomic_init) || defined(APR_OVERRIDE_ATOMIC_INIT) -#error Platform has redefined apr_atomic_init, but other default default atomics require a default apr_atomic_init -#endif -#endif /* APR_ATOMIC_NEED_DEFAULT_INIT */ - -#endif /* !DOXYGEN */ - -/** @} */ - -#ifdef __cplusplus -} -#endif - -#endif /* !APR_ATOMIC_H */ |