diff options
Diffstat (limited to 'ace/Pagefile_Memory_Pool.cpp')
| -rw-r--r-- | ace/Pagefile_Memory_Pool.cpp | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/ace/Pagefile_Memory_Pool.cpp b/ace/Pagefile_Memory_Pool.cpp new file mode 100644 index 00000000000..99a80760893 --- /dev/null +++ b/ace/Pagefile_Memory_Pool.cpp @@ -0,0 +1,362 @@ +// $Id$ + +// Pagefile_Memory_Pool.cpp +#include "ace/Pagefile_Memory_Pool.h" + +#if !defined (__ACE_INLINE__) +#include "ace/Pagefile_Memory_Pool.inl" +#endif /* __ACE_INLINE__ */ + +#include "ace/Log_Msg.h" +#include "ace/Auto_Ptr.h" +#include "ace/RW_Thread_Mutex.h" +#include "ace/OS_NS_sys_mman.h" +#include "ace/OS_NS_string.h" +#include "ace/OS_NS_sys_stat.h" +#include "ace/OS_NS_unistd.h" + +#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1) +#include "ace/Based_Pointer_T.h" +#include "ace/Based_Pointer_Repository.h" +#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */ + +ACE_RCSID(ace, Pagefile_Memory_Pool, "$Id$") + +#if defined (ACE_WIN32) +#if !defined (ACE_HAS_WINCE) +#define ACE_MAP_FILE(_hnd, _access, _offHigh, _offLow, _nBytes, _baseAdd)\ + MapViewOfFileEx (_hnd, _access, _offHigh, _offLow, _nBytes, _baseAdd) +#else //if !defined (ACE_HAS_WINCE) +#define ACE_MAP_FILE(_hnd, _access, _offHigh, _offLow, _nBytes, _baseAdd)\ + MapViewOfFile (_hnd, _access, _offHigh, _offLow, _nBytes) +#endif /* !defined (ACE_HAS_WINCE) */ + +ACE_Pagefile_Memory_Pool_Options::ACE_Pagefile_Memory_Pool_Options (void *base_addr, + size_t max_size) + : base_addr_ (base_addr), + max_size_ (max_size) +{ +} + +int +ACE_Pagefile_Memory_Pool::release (int) +{ + return this->unmap (); +} + +ACE_Pagefile_Memory_Pool::ACE_Pagefile_Memory_Pool (const ACE_TCHAR *backing_store_name, + const OPTIONS *options) + : shared_cb_ (0), + object_handle_ (0), + page_size_ (ACE_Pagefile_Memory_Pool::round_to_page_size (1)) +{ + // Initialize local copy of pool statistics. + if (options != 0) + { + this->local_cb_.req_base_ = options->base_addr_; + this->local_cb_.mapped_base_ = 0; + this->local_cb_.sh_.max_size_ = + options->max_size_; + this->local_cb_.sh_.mapped_size_ = 0; + this->local_cb_.sh_.free_offset_ = + this->local_cb_.sh_.mapped_size_; + this->local_cb_.sh_.free_size_ = 0; + } + + if (backing_store_name == 0) + // Only create a new unique filename for the backing store file if + // the user didn't supply one... + backing_store_name = ACE_DEFAULT_PAGEFILE_POOL_NAME; + + ACE_OS::strsncpy (this->backing_store_name_, + backing_store_name, + (sizeof this->backing_store_name_ / sizeof (ACE_TCHAR))); +} + +void * +ACE_Pagefile_Memory_Pool::acquire (size_t nbytes, + size_t &rounded_bytes) +{ + rounded_bytes = round_to_page_size (nbytes); + void *result = 0; + int first_time = 0; + + // Check local_cb_ for consistency. Remap, if extra space is too + // small and/or we didn't map the whole shared memory section + if (this->shared_cb_->sh_.mapped_size_ + > this->local_cb_.sh_.mapped_size_ + || this->shared_cb_->sh_.free_size_ < rounded_bytes) + { + size_t append = 0; + if (rounded_bytes > this->shared_cb_->sh_.free_size_) + append = rounded_bytes - this->shared_cb_->sh_.free_size_; + + if (this->map (first_time, append) < 0) + return result; + } + + // Get the block from extra space and update shared and local + // control block + if (this->shared_cb_->sh_.free_size_ < rounded_bytes) + return result; + + result = (void *)((char *) this->local_cb_.mapped_base_ + + this->shared_cb_->sh_.free_offset_); + this->shared_cb_->sh_.free_offset_ += rounded_bytes; + this->shared_cb_->sh_.free_size_ -= rounded_bytes; + this->local_cb_.sh_ = this->shared_cb_->sh_; + + return result; +} + +void * +ACE_Pagefile_Memory_Pool::init_acquire (size_t nbytes, + size_t &rounded_bytes, + int &first_time) +{ + // Map the shared memory and get information, if we created the + // shared memory. + if (this->map (first_time) < 0) + return 0; + + if (first_time != 0) + // We created the shared memory. So we have to allocate the + // requested memory. + return this->acquire (nbytes, rounded_bytes); + else + // We just mapped the memory and return the base address + return (void *)((char *) this->local_cb_.mapped_base_ + + ACE_Pagefile_Memory_Pool::round_to_page_size + ((int) sizeof (Control_Block))); +} + +int +ACE_Pagefile_Memory_Pool::seh_selector (void *ep) +{ + DWORD ecode = ((EXCEPTION_POINTERS *) ep)->ExceptionRecord->ExceptionCode; + + if (ecode == EXCEPTION_ACCESS_VIOLATION) + { + void * fault_addr = (void *) + ((EXCEPTION_POINTERS *) ep)->ExceptionRecord->ExceptionInformation[1]; + + if (this->remap (fault_addr) == 0) + return 1; + } + + return 0; +} + +int +ACE_Pagefile_Memory_Pool::remap (void *addr) +{ + // If the shared memory is not mapped or the address, that caused + // the memory fault is outside of the commited range of chunks, we + // return. + if (this->shared_cb_ == 0 + || addr < this->local_cb_.mapped_base_ + || addr >= (void *)((char *) this->local_cb_.mapped_base_ + + this->shared_cb_->sh_.mapped_size_)) + return -1; + + // We can solve the problem by committing additional chunks. + int first_time = 0; + return this->map (first_time); +} + +int +ACE_Pagefile_Memory_Pool::unmap (void) +{ +#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1) + ACE_BASED_POINTER_REPOSITORY::instance ()->unbind + (this->local_cb_.mapped_base_); +#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */ + + // Cleanup cached pool pointer. + this->shared_cb_ = 0; + + if (this->local_cb_.sh_.mapped_size_ > 0) + ::UnmapViewOfFile (this->local_cb_.mapped_base_); + + // Reset local pool statistics. + this->local_cb_.req_base_ = + ACE_DEFAULT_PAGEFILE_POOL_BASE; + this->local_cb_.mapped_base_ = 0; + this->local_cb_.sh_.max_size_ = + ACE_DEFAULT_PAGEFILE_POOL_SIZE; + this->local_cb_.sh_.mapped_size_ = 0; + this->local_cb_.sh_.free_offset_ = + this->local_cb_.sh_.mapped_size_; + this->local_cb_.sh_.free_size_ = 0; + + // Release the pool + if (this->object_handle_ != 0) + { + ::CloseHandle (this->object_handle_); + this->object_handle_ = 0; + } + return 0; +} + +int +ACE_Pagefile_Memory_Pool::map (int &first_time, + size_t append_bytes) +{ + size_t map_size; + void *map_addr; + + // Create file mapping, if not yet done + if (object_handle_ == 0) + { +#if (defined (ACE_HAS_WINNT4) && (ACE_HAS_WINNT4 != 0)) + // Allow access by all users. + SECURITY_ATTRIBUTES sa; + SECURITY_DESCRIPTOR sd; + ::InitializeSecurityDescriptor (&sd, + SECURITY_DESCRIPTOR_REVISION); + ::SetSecurityDescriptorDacl (&sd, + TRUE, + 0, + FALSE); + sa.nLength = sizeof (SECURITY_ATTRIBUTES); + sa.lpSecurityDescriptor = &sd; + sa.bInheritHandle = FALSE; +#endif /* (defined (ACE_HAS_WINNT4) && (ACE_HAS_WINNT4 != 0)) */ + + // Get an object handle to the named reserved memory object. + DWORD size_high; + DWORD size_low; +#if defined (ACE_WIN64) + size_high = static_cast<DWORD> (this->local_cb_.sh_.max_size_ >> 32); + size_low = static_cast<DWORD> (this->local_cb_.sh_.max_size_ & 0xFFFFFFFF); +#else + size_high = 0; + size_low = this->local_cb_.sh_.max_size_; +#endif + + object_handle_ = + ACE_TEXT_CreateFileMapping (INVALID_HANDLE_VALUE, +#if (defined (ACE_HAS_WINNT4) && (ACE_HAS_WINNT4 != 0)) + &sa, +#else + 0, +#endif /* (defined (ACE_HAS_WINNT4) && (ACE_HAS_WINNT4 != 0)) */ + PAGE_READWRITE | SEC_RESERVE, + size_high, + size_low, + this->backing_store_name_); + if (object_handle_ == 0) + return -1; + first_time = + ::GetLastError () == ERROR_ALREADY_EXISTS + ? 0 + : 1; + } + + // Do the initial mapping. + if (this->shared_cb_ == 0) + { + // Map a view to the shared memory. Note: <MapViewOfFile[Ex]> + // does *not* commit the pages! + this->shared_cb_ = (ACE_Pagefile_Memory_Pool::Control_Block *) + ACE_MAP_FILE (this->object_handle_, + FILE_MAP_WRITE, + 0, + 0, + this->local_cb_.sh_.max_size_, + this->local_cb_.req_base_); + if (this->shared_cb_ == 0) + return -1; + + // There was no previous mapping, so we map the first chunk and + // initialize the shared pool statistics. + if (first_time) + { + // 1st block is used to keep shared memory statistics. + map_size = + ACE_Pagefile_Memory_Pool::round_to_chunk_size + (ACE_Pagefile_Memory_Pool::round_to_page_size + ((int) sizeof(Control_Block)) + + append_bytes); + + if (::VirtualAlloc ((void *) this->shared_cb_, + map_size, + MEM_COMMIT, + PAGE_READWRITE) == 0) + return -1; + + this->shared_cb_->req_base_ = 0; + this->shared_cb_->mapped_base_ = 0; + this->local_cb_.mapped_base_ = this->shared_cb_; + this->local_cb_.sh_.mapped_size_ = map_size; + this->local_cb_.sh_.free_offset_ = + round_to_page_size ((int) sizeof (Control_Block)); + this->local_cb_.sh_.free_size_ = + this->local_cb_.sh_.mapped_size_ - + this->local_cb_.sh_.free_offset_; + this->shared_cb_->sh_ = this->local_cb_.sh_; + } + + // The shared memory exists, so we map the first chunk to the + // base address of the pool to get the shared pool statistics. + else + { + // 1st block is used to keep shared memory statistics. + map_size = + ACE_Pagefile_Memory_Pool::round_to_chunk_size + ((int) sizeof (Control_Block)); + + if (::VirtualAlloc ((void *) this->shared_cb_, + map_size, + MEM_COMMIT, + PAGE_READWRITE) == 0) + return -1; + this->local_cb_.mapped_base_ = this->shared_cb_; + this->local_cb_.sh_.mapped_size_ = map_size; + } + } + + // If the shared memory is larger than the part we've already + // committed, we have to remap it. + if (this->shared_cb_->sh_.mapped_size_ > + this->local_cb_.sh_.mapped_size_ + || append_bytes > 0) + { + map_size = + (this->shared_cb_->sh_.mapped_size_ - + this->local_cb_.sh_.mapped_size_) + + ACE_Pagefile_Memory_Pool::round_to_chunk_size + (append_bytes); + + map_addr = (void *)((char *) this->shared_cb_ + + this->local_cb_.sh_.mapped_size_); + + if (::VirtualAlloc (map_addr, + map_size, + MEM_COMMIT, + PAGE_READWRITE) == 0) + return -1; + else if (append_bytes > 0) + { + this->shared_cb_->sh_.mapped_size_ += + round_to_chunk_size (append_bytes); + this->shared_cb_->sh_.free_size_ = + this->shared_cb_->sh_.mapped_size_ - + this->shared_cb_->sh_.free_offset_; + } + } + + // Update local copy of the shared memory statistics. + this->local_cb_.sh_ = + this->shared_cb_->sh_; +#if (ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1) + ACE_BASED_POINTER_REPOSITORY::instance ()->bind + (this->local_cb_.mapped_base_, + this->local_cb_.sh_.mapped_size_); +#endif /* ACE_HAS_POSITION_INDEPENDENT_POINTERS == 1 */ + + return 0; +} + +#endif /* ACE_WIN32 */ + |