mirror of https://gitee.com/bigwinds/arangodb
452 lines
14 KiB
C
452 lines
14 KiB
C
////////////////////////////////////////////////////////////////////////////////
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/// @brief basic memory management
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#include "BasicsC/common.h"
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#include "BasicsC/logging.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- private defines
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Memory
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief threshold for producing malloc warnings
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///
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/// this is only active if zone debug is enabled. Any malloc operations that
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/// try to alloc more memory than the threshold will be logged so we can check
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/// why so much memory is needed
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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#define MALLOC_WARNING_THRESHOLD (4 * 1024 * 1024)
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief macros for producing log output
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///
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/// these will include the location of the problematic if we are in zone debug
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/// mode, and will not include it if in non debug mode
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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#define ZONE_DEBUG_LOCATION "in %s:%d"
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#define ZONE_DEBUG_PARAMS ,file, line
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#else
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#define ZONE_DEBUG_LOCATION
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#define ZONE_DEBUG_PARAMS
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Memory
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief core memory zone, allocation will never fail
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////////////////////////////////////////////////////////////////////////////////
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static TRI_memory_zone_t TriCoreMemZone;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief unknown memory zone
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////////////////////////////////////////////////////////////////////////////////
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static TRI_memory_zone_t TriUnknownMemZone;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief memory reserve for core memory zone
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////////////////////////////////////////////////////////////////////////////////
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static void* CoreReserve;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the core was intialised
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////////////////////////////////////////////////////////////////////////////////
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static int CoreInitialised = 0;
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- public variables
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Memory
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief core memory zone, allocation will never fail
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////////////////////////////////////////////////////////////////////////////////
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TRI_memory_zone_t* TRI_CORE_MEM_ZONE = &TriCoreMemZone;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief unknown memory zone
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////////////////////////////////////////////////////////////////////////////////
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#ifndef TRI_ENABLE_MAINTAINER_MODE
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TRI_memory_zone_t* TRI_UNKNOWN_MEM_ZONE = &TriUnknownMemZone;
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- public functions
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @addtogroup Memory
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/// @{
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief generates an error message
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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TRI_memory_zone_t* TRI_UnknownMemZoneZ (char const* file, int line) {
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return &TriUnknownMemZone;
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}
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#endif
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////////////////////////////////////////////////////////////////////////////////
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/// @brief system memory allocation
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////////////////////////////////////////////////////////////////////////////////
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void* TRI_SystemAllocate (uint64_t n, bool set) {
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char* m;
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m = malloc((size_t) n);
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if (m != NULL) {
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if (set) {
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memset(m, 0, (size_t) n);
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}
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}
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return m;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief basic memory management for allocate
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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void* TRI_AllocateZ (TRI_memory_zone_t* zone, uint64_t n, bool set, char const* file, int line) {
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#else
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void* TRI_Allocate (TRI_memory_zone_t* zone, uint64_t n, bool set) {
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#endif
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char* m;
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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// warn in the case of very big malloc operations
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if (n >= MALLOC_WARNING_THRESHOLD) {
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LOG_WARNING("big malloc action: %llu bytes in %s:%d", (unsigned long long) n, file, line);
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}
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m = malloc((size_t) n + sizeof(uintptr_t));
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#else
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m = malloc((size_t) n);
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#endif
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if (m == NULL) {
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if (zone->_failable) {
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TRI_set_errno(TRI_ERROR_OUT_OF_MEMORY);
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return NULL;
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}
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if (CoreReserve == NULL) {
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fprintf(stderr,
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"FATAL: failed to allocate %llu bytes for memory zone %d" ZONE_DEBUG_LOCATION ", giving up!",
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(unsigned long long) n,
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(int) zone->_zid
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ZONE_DEBUG_PARAMS);
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TRI_EXIT_FUNCTION(EXIT_FAILURE, NULL);
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}
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free(CoreReserve);
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CoreReserve = NULL;
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LOG_ERROR("failed to allocate %llu bytes for memory zone %d" ZONE_DEBUG_LOCATION ", retrying!",
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(unsigned long long) n,
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(int) zone->_zid
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ZONE_DEBUG_PARAMS);
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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return TRI_AllocateZ(zone, n, set, file, line);
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#else
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return TRI_Allocate(zone, n, set);
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#endif
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}
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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else if (set) {
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memset(m, 0, (size_t) n + sizeof(uintptr_t));
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}
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else {
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// prefill with 0xA5 (magic value, same as Valgrind will use)
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memset(m, 0xA5, (size_t) n + sizeof(uintptr_t));
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}
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#else
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else if (set) {
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memset(m, 0, (size_t) n);
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}
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#endif
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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* (uintptr_t*) m = zone->_zid;
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// zone->_zid is a uint32_t but we'll advance sizeof(uintptr_t) bytes for good alignment everywhere
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m += sizeof(uintptr_t);
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#endif
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return m;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief basic memory management for reallocate
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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void* TRI_ReallocateZ (TRI_memory_zone_t* zone, void* m, uint64_t n, char const* file, int line) {
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#else
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void* TRI_Reallocate (TRI_memory_zone_t* zone, void* m, uint64_t n) {
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#endif
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char* p;
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if (m == NULL) {
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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return TRI_AllocateZ(zone, n, false, file, line);
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#else
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return TRI_Allocate(zone, n, false);
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#endif
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}
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p = (char*) m;
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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p -= sizeof(uintptr_t);
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if (* (uintptr_t*) p != zone->_zid) {
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LOG_WARNING("memory zone mismatch in TRI_Reallocate in %s:%d, old zone %d, new zone %d",
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file,
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line,
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(int) * (uintptr_t*) p,
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(int) zone->_zid);
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}
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p = realloc(p, (size_t) n + sizeof(uintptr_t));
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#else
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p = realloc(p, (size_t) n);
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#endif
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if (p == NULL) {
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if (zone->_failable) {
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TRI_set_errno(TRI_ERROR_OUT_OF_MEMORY);
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return NULL;
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}
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if (CoreReserve == NULL) {
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fprintf(stderr,
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"FATAL: failed to re-allocate %llu bytes for memory zone %d" ZONE_DEBUG_LOCATION ", giving up!",
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(unsigned long long) n,
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zone->_zid
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ZONE_DEBUG_PARAMS);
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TRI_EXIT_FUNCTION(EXIT_FAILURE, NULL);
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}
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free(CoreReserve);
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CoreReserve = NULL;
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LOG_ERROR("failed to re-allocate %llu bytes for memory zone %d" ZONE_DEBUG_LOCATION ", retrying!",
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(unsigned long long) n,
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(int) zone->_zid
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ZONE_DEBUG_PARAMS);
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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return TRI_ReallocateZ(zone, m, n, file, line);
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#else
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return TRI_Reallocate(zone, m, n);
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#endif
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}
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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// zone->_zid is a uint32_t but we'll advance sizeof(uintptr_t) bytes for good alignment everywhere
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p += sizeof(uintptr_t);
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#endif
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return p;
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief basic memory management for deallocate
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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void TRI_FreeZ (TRI_memory_zone_t* zone, void* m, char const* file, int line) {
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#else
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void TRI_Free (TRI_memory_zone_t* zone, void* m) {
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#endif
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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char* p;
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p = (char*) m;
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if (p == NULL) {
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LOG_ERROR("freeing nil ptr " ZONE_DEBUG_LOCATION ZONE_DEBUG_PARAMS);
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}
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// zone->_zid is a uint32_t but we'll decrease by sizeof(uintptr_t) bytes for good alignment everywhere
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p -= sizeof(uintptr_t);
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if (* (uintptr_t*) p != zone->_zid) {
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LOG_WARNING("memory zone mismatch in TRI_Free " ZONE_DEBUG_LOCATION ", old zone %d, new %d"
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ZONE_DEBUG_PARAMS,
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(int) * (uintptr_t*) p,
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(int) zone->_zid);
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}
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free(p);
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#else
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free(m);
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#endif
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief free memory allocated by some low-level functions
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///
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/// this can be used to free memory that was not allocated by TRI_Allocate, but
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/// by malloc et al
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////////////////////////////////////////////////////////////////////////////////
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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void TRI_SystemFreeZ (void* p, char const* file, int line) {
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#else
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void TRI_SystemFree (void* p) {
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#endif
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#ifdef TRI_ENABLE_MAINTAINER_MODE
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if (p == NULL) {
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LOG_ERROR("freeing nil ptr in %s:%d", file, line);
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}
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#endif
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free(p);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief wrapper for realloc
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///
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/// this wrapper is used together with libev, as the builtin libev allocator
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/// causes problems with Valgrind:
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/// - http://lists.schmorp.de/pipermail/libev/2012q2/001917.html
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/// - http://lists.gnu.org/archive/html/bug-gnulib/2011-03/msg00243.html
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////////////////////////////////////////////////////////////////////////////////
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void* TRI_WrappedReallocate (void* ptr, long size) {
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if (ptr == NULL && size == 0) {
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return NULL;
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}
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return realloc(ptr, (size_t) size);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief initialize memory subsystem
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////////////////////////////////////////////////////////////////////////////////
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void TRI_InitialiseMemory () {
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static size_t const reserveSize = 1024 * 1024 * 10;
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if (CoreInitialised == 0) {
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TriCoreMemZone._zid = 0;
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TriCoreMemZone._failed = false;
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TriCoreMemZone._failable = false;
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TriUnknownMemZone._zid = 1;
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TriUnknownMemZone._failed = false;
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TriUnknownMemZone._failable = true;
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CoreReserve = malloc(reserveSize);
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if (CoreReserve == NULL) {
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fprintf(stderr,
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"FATAL: cannot allocate initial core reserve of size %llu, giving up!\n",
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(unsigned long long) reserveSize);
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}
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else {
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CoreInitialised = 1;
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}
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief shutdown memory subsystem
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////////////////////////////////////////////////////////////////////////////////
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void TRI_ShutdownMemory () {
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if (CoreInitialised == 1) {
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free(CoreReserve);
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CoreInitialised = 0;
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @}
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////////////////////////////////////////////////////////////////////////////////
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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