diff options
Diffstat (limited to 'ace/Memory_Pool.cpp')
| -rw-r--r-- | ace/Memory_Pool.cpp | 764 |
1 files changed, 0 insertions, 764 deletions
diff --git a/ace/Memory_Pool.cpp b/ace/Memory_Pool.cpp deleted file mode 100644 index bf0772c3475..00000000000 --- a/ace/Memory_Pool.cpp +++ /dev/null @@ -1,764 +0,0 @@ -// $Id$ - -// Memory_Pool.cpp -#define ACE_BUILD_DLL -#include "ace/Memory_Pool.h" - -#if !defined (__ACE_INLINE__) -#include "ace/Memory_Pool.i" -#endif /* __ACE_INLINE__ */ - -ACE_ALLOC_HOOK_DEFINE(ACE_Local_Memory_Pool) - -void -ACE_Local_Memory_Pool::dump (void) const -{ - ACE_TRACE ("ACE_Local_Memory_Pool::dump"); -} - -ACE_Local_Memory_Pool::ACE_Local_Memory_Pool (LPCTSTR , - const OPTIONS *) -{ - ACE_TRACE ("ACE_Local_Memory_Pool::ACE_Local_Memory_Pool"); -} - -void * -ACE_Local_Memory_Pool::acquire (size_t nbytes, - size_t &rounded_bytes) -{ - ACE_TRACE ("ACE_Local_Memory_Pool::acquire"); - rounded_bytes = this->round_up (nbytes); - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) acquiring more chunks, nbytes = %d, rounded_bytes = %d\n"), nbytes, rounded_bytes)); - - void *cp = (void *) new char[rounded_bytes]; - - if (cp == 0) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %u\n"), cp), 0); - else - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) acquired more chunks, nbytes = %d, rounded_bytes = %d, new break = %d\n"), nbytes, rounded_bytes, cp)); - return cp; -} - -ACE_ALLOC_HOOK_DEFINE(ACE_MMAP_Memory_Pool) - -void -ACE_MMAP_Memory_Pool::dump (void) const -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::dump"); -} - -int -ACE_MMAP_Memory_Pool::release (void) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::release"); - this->mmap_.remove (); - return 0; -} - -int -ACE_MMAP_Memory_Pool::sync (ssize_t len, int flags) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::sync"); - - if (len < 0) - len = ACE_OS::lseek (this->mmap_.handle (), 0, SEEK_END); - - return this->mmap_.sync (len, flags); -} - -// Sync <len> bytes of the memory region to the backing store starting -// at <addr_>. - -int -ACE_MMAP_Memory_Pool::sync (void *addr, size_t len, int flags) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::sync"); - return ACE_OS::msync (addr, len, flags); -} - -// Change the protection of the pages of the mapped region to <prot> -// starting at <this->base_addr_> up to <len> bytes. If <len> == -1 -// then change protection of all pages in the mapped region. - -int -ACE_MMAP_Memory_Pool::protect (ssize_t len, int prot) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::protect"); - - if (len < 0) - len = ACE_OS::lseek (this->mmap_.handle (), 0, SEEK_END); - - return this->mmap_.protect (len, prot); -} - -// Change the protection of the pages of the mapped region to <prot> -// starting at <addr> up to <len> bytes. - -int -ACE_MMAP_Memory_Pool::protect (void *addr, size_t len, int prot) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::protect"); - return ACE_OS::mprotect (addr, len, prot); -} - -ACE_MMAP_Memory_Pool::ACE_MMAP_Memory_Pool (LPCTSTR backing_store_name, - const OPTIONS *options) - : base_addr_ (0), - flags_ (MAP_SHARED), - write_each_page_ (0), - minimum_bytes_ (0), - sa_ (0) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::ACE_MMAP_Memory_Pool"); - -#if (defined (ACE_HAS_SIGINFO_T) && !defined (ACE_LACKS_SI_ADDR)) || defined (ACE_WIN32) - // For plaforms that give the faulting address. - guess_on_fault_ = 0; -#else - // For plaforms that do NOT give the faulting address, let the - // options decide whether to guess or not. - if (options) - guess_on_fault_ = options->guess_on_fault_; - else - // If no options are specified, default to true. - guess_on_fault_ = 1; -#endif - - // Only change the defaults if <options> != 0. - if (options) - { - if (options->use_fixed_addr_) - { - this->base_addr_ = options->base_addr_; - ACE_SET_BITS (flags_, MAP_FIXED); - } - this->write_each_page_ = options->write_each_page_; - this->minimum_bytes_ = options->minimum_bytes_; - if (options->flags_ != 0) - this->flags_ = options->flags_; - if (options->sa_ != 0) - this->sa_ = options->sa_; - } - - 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_BACKING_STORE; // from "ace/OS.h" - - ACE_OS::strncpy (this->backing_store_name_, - backing_store_name, - (sizeof this->backing_store_name_ / sizeof (TCHAR))); - -#if !defined (ACE_WIN32) && !defined (CHORUS) - if (this->signal_handler_.register_handler (SIGSEGV, this) == -1) - ACE_ERROR ((LM_ERROR, "%p\n", this->backing_store_name_)); -#endif /* ACE_WIN32 */ -} - -// Compute the new file_offset of the backing store and commit the -// memory. -int -ACE_MMAP_Memory_Pool::commit_backing_store_name (size_t rounded_bytes, - off_t &file_offset) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::commit_backing_store_name"); - - size_t seek_len; - - if (this->write_each_page_) - // Write to the end of every block to ensure that we have enough - // space in the backing store. - seek_len = this->round_up (1); // round_up(1) is one page. - else - // We're willing to risk it all in the name of efficiency... - seek_len = rounded_bytes; - - // The following loop will execute multiple times (if - // this->write_each_page == 1) or just once (if - // this->write_each_page == 0). - - for (size_t cur_block = 0; - cur_block < rounded_bytes; - cur_block += seek_len) - { - file_offset = ACE_OS::lseek (this->mmap_.handle () , seek_len - 1, SEEK_END); - - if (file_offset == -1 || ACE_OS::write (this->mmap_.handle (), "", 1) == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), - this->backing_store_name_), -1); - } - - // Increment by one to put us at the beginning of the next chunk... - file_offset++; - return 0; -} - -// Memory map the file up to <file_offset> bytes. - -int -ACE_MMAP_Memory_Pool::map_file (off_t file_offset) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::map_file"); - - // Unmap the existing mapping. - this->mmap_.unmap (); - - // Remap the file. - if (this->mmap_.map (file_offset, PROT_RDWR, - this->flags_, this->base_addr_, 0, this->sa_) == -1 - || this->base_addr_ != 0 && this->mmap_.addr () != this->base_addr_) - ACE_ERROR_RETURN ((LM_ERROR, - ASYS_TEXT ("(%P|%t) addr = %u, base_addr = %u, file_offset = %u, %p\n"), - this->mmap_.addr (), this->base_addr_, - file_offset, this->backing_store_name_), -1); - - return 0; -} - -// Ask operating system for more shared memory, increasing the mapping -// accordingly. Note that this routine assumes that the appropriate -// locks are held when it is called. - -void * -ACE_MMAP_Memory_Pool::acquire (size_t nbytes, - size_t &rounded_bytes) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::acquire"); - rounded_bytes = this->round_up (nbytes); - - // ACE_DEBUG ((LM_DEBUG, "(%P|%t) acquiring more chunks, nbytes = - // %d, rounded_bytes = %d\n", nbytes, rounded_bytes)); - - off_t file_offset; - - if (this->commit_backing_store_name (rounded_bytes, - file_offset) == -1) - return 0; - - if (this->map_file (file_offset) == -1) - return 0; - - // ACE_DEBUG ((LM_DEBUG, "(%P|%t) acquired more chunks, nbytes = %d, - // rounded_bytes = %d, file_offset = %d\n", nbytes, rounded_bytes, - // file_offset)); - - return (void *) ((char *) this->mmap_.addr () + (this->mmap_.size () - rounded_bytes)); -} - -// Ask system for initial chunk of shared memory. - -void * -ACE_MMAP_Memory_Pool::init_acquire (size_t nbytes, - size_t &rounded_bytes, - int &first_time) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::init_acquire"); - - first_time = 0; - - if (nbytes < (size_t) this->minimum_bytes_) - nbytes = this->minimum_bytes_; - - if (this->mmap_.open (this->backing_store_name_, - O_RDWR | O_CREAT | O_TRUNC | O_EXCL, - ACE_DEFAULT_FILE_PERMS, this->sa_) != -1) - { - // First time in, so need to acquire memory. - first_time = 1; - return this->acquire (nbytes, rounded_bytes); - } - else if (errno == EEXIST) - { - errno = 0; - // Reopen file *without* using O_EXCL... - if (this->mmap_.map (this->backing_store_name_, - -1, - O_RDWR, - ACE_DEFAULT_FILE_PERMS, - PROT_RDWR, - this->flags_, - this->base_addr_, - 0, - this->sa_) == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("%p\n"), ASYS_TEXT ("open")), 0); - - return this->mmap_.addr (); - } - else - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("%p\n"), ASYS_TEXT ("open")), 0); -} - -int -ACE_MMAP_Memory_Pool::remap (void *addr) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::remap"); - ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("Remapping with fault address at: %X\n"), addr)); - off_t current_file_offset = ACE_OS::filesize (this->mmap_.handle ()); - // ACE_OS::lseek (this->mmap_.handle (), 0, SEEK_END); - - if (!(addr < (void *) ((char *) this->mmap_.addr () + current_file_offset) - && addr >= this->mmap_.addr ())) - return -1; - - // Extend the mapping to cover the size of the backing store. - return this->map_file (current_file_offset); -} - -ACE_MMAP_Memory_Pool_Options::ACE_MMAP_Memory_Pool_Options (void *base_addr, - int use_fixed_addr, - int write_each_page, - off_t minimum_bytes, - u_int flags, - int guess_on_fault, - LPSECURITY_ATTRIBUTES sa) - : base_addr_ (base_addr), - use_fixed_addr_ (use_fixed_addr), - write_each_page_ (write_each_page), - minimum_bytes_ (minimum_bytes), - flags_ (flags), - guess_on_fault_ (guess_on_fault), - sa_ (sa) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool_Options::ACE_MMAP_Memory_Pool_Options"); -// HP-UX 11, 64-bit bug workaround. -#if defined (__hpux) && defined (__LP64__) -long temp = ACE_DEFAULT_BASE_ADDRL; -base_addr_ = (void *)temp; -#endif -} - -// Handle SIGSEGV and SIGBUS signals to remap memory properly. When a -// process reads or writes to non-mapped memory a signal (SIGBUS or -// SIGSEGV) will be triggered. At that point, the ACE_Sig_Handler -// (which is part of the ACE_Reactor) will catch the signal and -// dispatch the handle_signal() method defined here. If the SIGSEGV -// signal occurred due to the fact that the mapping wasn't uptodate -// with respect to the backing store, the handler method below will -// update the mapping accordingly. When the signal handler returns, -// the instruction should be restarted and the operation should work. - -int -ACE_MMAP_Memory_Pool::handle_signal (int signum, siginfo_t *siginfo, ucontext_t *) -{ - ACE_TRACE ("ACE_MMAP_Memory_Pool::handle_signal"); - - if (signum != SIGSEGV) - ACE_ERROR_RETURN ((LM_ERROR, - ASYS_TEXT ("(%P|%t) ignoring signal %S\n"), - signum), -1); - else - ; // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) received %S\n"), signum)); - - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) new mapping address = %u\n"), (char *) this->base_addr_ + current_file_offset)); - -#if defined (ACE_HAS_SIGINFO_T) && !defined (ACE_LACKS_SI_ADDR) - // Make sure that the pointer causing the problem is within the - // range of the backing store. - - if (siginfo != 0) - { - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) si_signo = %d, si_code = %d, addr = %u\n"), siginfo->si_signo, siginfo->si_code, siginfo->si_addr)); - if (this->remap ((void *) siginfo->si_addr) == -1) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) address %u out of range\n", - siginfo->si_addr), -1); - return 0; - } -#else - ACE_UNUSED_ARG(siginfo); -#endif /* ACE_HAS_SIGINFO_T && !defined ACE_LACKS_SI_ADDR */ - // If guess_on_fault_ is true, then we want to try to remap without - // knowing the faulting address. guess_on_fault_ can only be true - // on platforms that do not provide the faulting address through - // signals or exceptions. - if (guess_on_fault_) - { - off_t current_file_offset = ACE_OS::filesize (this->mmap_.handle ()); - - // Extend the mapping to cover the size of the backing store. - return this->map_file (current_file_offset); - } - else - return -1; -} - -ACE_ALLOC_HOOK_DEFINE(ACE_Lite_MMAP_Memory_Pool) - -ACE_Lite_MMAP_Memory_Pool::ACE_Lite_MMAP_Memory_Pool (LPCTSTR backing_store_name, - const OPTIONS *options) - : ACE_MMAP_Memory_Pool (backing_store_name, options) -{ - ACE_TRACE ("ACE_Lite_MMAP_Memory_Pool::ACE_Lite_MMAP_Memory_Pool"); -} - -int -ACE_Lite_MMAP_Memory_Pool::sync (ssize_t, int) -{ - ACE_TRACE ("ACE_Lite_MMAP_Memory_Pool::sync"); - return 0; -} - -int -ACE_Lite_MMAP_Memory_Pool::sync (void *, size_t, int) -{ - ACE_TRACE ("ACE_Lite_MMAP_Memory_Pool::sync"); - return 0; -} - -#if !defined (ACE_LACKS_SBRK) -ACE_ALLOC_HOOK_DEFINE(ACE_Sbrk_Memory_Pool) - -// Ask system for more local memory via sbrk(2). - -void * -ACE_Sbrk_Memory_Pool::acquire (size_t nbytes, - size_t &rounded_bytes) -{ - ACE_TRACE ("ACE_Sbrk_Memory_Pool::acquire"); - rounded_bytes = this->round_up (nbytes); - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) acquiring more chunks, nbytes = %d, rounded_bytes = %d\n"), nbytes, rounded_bytes)); - void *cp = ACE_OS::sbrk (rounded_bytes); - - if (cp == MAP_FAILED) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) cp = %u\n", cp), 0); - else - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) acquired more chunks, nbytes = %d, rounded_bytes = %d, new break = %u\n"), nbytes, rounded_bytes, cp)); - return cp; -} - -void -ACE_Sbrk_Memory_Pool::dump (void) const -{ - ACE_TRACE ("ACE_Sbrk_Memory_Pool::dump"); -} - -ACE_Sbrk_Memory_Pool::ACE_Sbrk_Memory_Pool (LPCTSTR , - const OPTIONS *) -{ - ACE_TRACE ("ACE_Sbrk_Memory_Pool::ACE_Sbrk_Memory_Pool"); -} -#endif /* !ACE_LACKS_SBRK */ - -#if !defined (ACE_LACKS_SYSV_SHMEM) -ACE_ALLOC_HOOK_DEFINE(ACE_Shared_Memory_Pool) - -ACE_Shared_Memory_Pool_Options::ACE_Shared_Memory_Pool_Options (char *base_addr, - size_t max_segments, - size_t file_perms, - off_t minimum_bytes) - : base_addr_ (base_addr), - max_segments_ (max_segments), - minimum_bytes_ (minimum_bytes), - file_perms_ (file_perms) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool_Options::ACE_Shared_Memory_Pool_Options"); -// HP-UX 11, 64-bit bug workaround -#if defined (__hpux) && defined(__LP64__) -long temp = ACE_DEFAULT_BASE_ADDRL; -base_addr_ = (char *)temp; -#endif -} - -void -ACE_Shared_Memory_Pool::dump (void) const -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::dump"); -} - -int -ACE_Shared_Memory_Pool::in_use (off_t &offset, - size_t &counter) -{ - offset = 0; - SHM_TABLE *st = (SHM_TABLE *) this->base_addr_; - shmid_ds buf; - - for (counter = 0; - counter < this->max_segments_ && st[counter].used_ == 1; - counter++) - { - if (ACE_OS::shmctl (st[counter].shmid_, IPC_STAT, &buf) == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("shmctl")), -1); - offset += buf.shm_segsz; - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) segment size = %d, offset = %d\n"), buf.shm_segsz, offset)); - } - - return 0; -} - -int -ACE_Shared_Memory_Pool::find_seg (const void*const searchPtr, - off_t &offset, - size_t &counter) -{ - offset = 0; - SHM_TABLE *st = (SHM_TABLE *) this->base_addr_; - shmid_ds buf; - - for (counter = 0; - counter < this->max_segments_ - && st[counter].used_ == 1; - counter++) - { - if (ACE_OS::shmctl (st[counter].shmid_, IPC_STAT, &buf) == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("shmctl")), -1); - offset += buf.shm_segsz; - - // If segment 'counter' starts at a location greater than the - // place we are searching for. We then decrement the offset to - // the start of counter-1. (flabar@vais.net) - if ((offset + (off_t)(this->base_addr_) ) > (off_t)searchPtr) - { - --counter; - offset -= buf.shm_segsz; - return 0; - } - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) segment size = %d, offset = %d\n"), buf.shm_segsz, offset)); - } - - return 0; -} - -int -ACE_Shared_Memory_Pool::commit_backing_store_name (size_t rounded_bytes, - off_t &offset) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::update"); - - size_t counter; - SHM_TABLE *st = (SHM_TABLE *) this->base_addr_; - - if (this->in_use (offset, counter) == -1) - return -1; - - if (counter == this->max_segments_) - ACE_ERROR_RETURN ((LM_ERROR, - "exceeded max number of segments = %d, base = %u, offset = %u\n", - counter, this->base_addr_, offset), -1); - else - { - int shmid = ACE_OS::shmget (st[counter].key_, - rounded_bytes, - this->file_perms_ | IPC_CREAT | IPC_EXCL); - if (shmid == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("shmget")), 0); - - st[counter].shmid_ = shmid; - st[counter].used_ = 1; - - void *address = (void *) (((char *) this->base_addr_) + offset); - void *shmem = ACE_OS::shmat (st[counter].shmid_, (char *) address, 0); - - if (shmem != address) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) %p, shmem = %u, address = %u\n", - "shmat", shmem, address), 0); - } - return 0; -} - -// Handle SIGSEGV and SIGBUS signals to remap shared memory properly. - -int -ACE_Shared_Memory_Pool::handle_signal (int , siginfo_t *siginfo, ucontext_t *) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::handle_signal"); - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("signal %S occurred\n"), signum)); - -#if defined (ACE_HAS_SIGINFO_T) && !defined (ACE_LACKS_SI_ADDR) - off_t offset; - // Make sure that the pointer causing the problem is within the - // range of the backing store. - - if (siginfo != 0) - { - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) si_signo = %d, si_code = %d, addr = %u\n"), siginfo->si_signo, siginfo->si_code, siginfo->si_addr)); - size_t counter; - if (this->in_use (offset, counter) == -1) - ACE_ERROR ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("in_use"))); - else if (!(siginfo->si_code == SEGV_MAPERR - && siginfo->si_addr < (((char *) this->base_addr_) + offset) - && siginfo->si_addr >= ((char *) this->base_addr_))) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) address %u out of range\n", - siginfo->si_addr), -1); - } - - // The above if case will check to see that the address is in the - // proper range. Therefore there is a segment out there that the - // pointer wants to point into. Find the segment that someone else - // has used and attach to it (flabar@vais.net) - - size_t counter; // ret value to get shmid from the st table. - - if (this->find_seg (siginfo->si_addr, offset, counter) == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("in_use")), -1); - - void *address = (void *) (((char *) this->base_addr_) + offset); - SHM_TABLE *st = (SHM_TABLE *) this->base_addr_; - - void *shmem = ACE_OS::shmat (st[counter].shmid_, (char *) address, 0); - - if (shmem != address) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) %p, shmem = %u, address = %u\n", - "shmat", shmem, address), 0); - - // NOTE: this won't work if we dont have SIGINFO_T or SI_ADDR -#else - ACE_UNUSED_ARG (siginfo); -#endif /* ACE_HAS_SIGINFO_T && !defined (ACE_LACKS_SI_ADDR) */ - - return 0; -} - -ACE_Shared_Memory_Pool::ACE_Shared_Memory_Pool (LPCTSTR backing_store_name, - const OPTIONS *options) - : base_addr_ (0), - file_perms_ (ACE_DEFAULT_FILE_PERMS), - max_segments_ (ACE_DEFAULT_MAX_SEGMENTS), - minimum_bytes_ (0) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::ACE_Shared_Memory_Pool"); - - // Only change the defaults if <options> != 0. - if (options) - { - this->base_addr_ = (void *) options->base_addr_; - this->max_segments_ = options->max_segments_; - this->file_perms_ = options->file_perms_; - this->minimum_bytes_ = options->minimum_bytes_; - } - - if (backing_store_name) - { - // Convert the string into a number that is used as the segment - // key. - - int result = ::sscanf (backing_store_name, - "%d", - &this->base_shm_key_); - - if (result == 0 || result == EOF) - // The conversion to a number failed so hash with crc32 - // ACE::crc32 is also used in <SV_Semaphore_Simple>. - this->base_shm_key_ = (key_t) ACE::crc32 (backing_store_name); - - if (this->base_shm_key_ == IPC_PRIVATE) - // Make sure that the segment can be shared between unrelated - // processes. - this->base_shm_key_ = ACE_DEFAULT_SHM_KEY; - } - else - this->base_shm_key_ = ACE_DEFAULT_SHM_KEY; - - if (this->signal_handler_.register_handler (SIGSEGV, this) == -1) - ACE_ERROR ((LM_ERROR, ASYS_TEXT ("%p\n"), ASYS_TEXT ("ACE_Sig_Handler::register_handler"))); -} - -// Ask system for more shared memory. - -void * -ACE_Shared_Memory_Pool::acquire (size_t nbytes, - size_t &rounded_bytes) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::acquire"); - - rounded_bytes = this->round_up (nbytes); - - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) acquiring more chunks, nbytes = %d, rounded_bytes = %d\n"), nbytes, rounded_bytes)); - - off_t offset; - - if (this->commit_backing_store_name (rounded_bytes, offset) == -1) - return 0; - - // ACE_DEBUG ((LM_DEBUG, ASYS_TEXT ("(%P|%t) acquired more chunks, nbytes = %d, rounded_bytes = %d\n"), nbytes, rounded_bytes)); - return ((char *) this->base_addr_) + offset; -} - -// Ask system for initial chunk of shared memory. - -void * -ACE_Shared_Memory_Pool::init_acquire (size_t nbytes, - size_t &rounded_bytes, - int &first_time) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::init_acquire"); - - off_t shm_table_offset = ACE::round_to_pagesize (sizeof (SHM_TABLE)); - rounded_bytes = this->round_up (nbytes > (size_t) this->minimum_bytes_ - ? nbytes - : (size_t) this->minimum_bytes_); - - // Acquire the semaphore to serialize initialization and prevent - // race conditions. - - int shmid = ACE_OS::shmget (this->base_shm_key_, - rounded_bytes + shm_table_offset, - this->file_perms_ | IPC_CREAT | IPC_EXCL); - if (shmid == -1) - { - if (errno != EEXIST) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("shmget")), 0); - - first_time = 0; - - shmid = ACE_OS::shmget (this->base_shm_key_, 0, 0); - - if (shmid == -1) - ACE_ERROR_RETURN ((LM_ERROR, ASYS_TEXT ("(%P|%t) %p\n"), ASYS_TEXT ("shmget")), 0); - - // This implementation doesn't care if we don't get the key we want... - this->base_addr_ = ACE_OS::shmat (shmid, (char *) this->base_addr_, 0); - - if (this->base_addr_ == 0) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) %p, base_addr = %u\n", - "shmat", this->base_addr_), 0); - } - else - { - first_time = 1; - - // This implementation doesn't care if we don't get the key we want... - this->base_addr_ = ACE_OS::shmat (shmid, (char *) this->base_addr_, 0); - - if (this->base_addr_ == 0) - ACE_ERROR_RETURN ((LM_ERROR, "(%P|%t) %p, base_addr = %u\n", - "shmat", this->base_addr_), 0); - - SHM_TABLE *st = (SHM_TABLE *) this->base_addr_; - - st[0].key_ = this->base_shm_key_; - st[0].shmid_ = shmid; - - st[0].used_ = 1; - - for (size_t counter = 1; // Skip over the first entry... - counter < this->max_segments_; - counter++) - { - st[counter].key_ = this->base_shm_key_ + counter; - st[counter].shmid_ = 0; - st[counter].used_ = 0; - } - } - - return (void *) (((char *) this->base_addr_) + shm_table_offset); -} - -// Instruct the memory pool to release all of its resources. - -int -ACE_Shared_Memory_Pool::release (void) -{ - ACE_TRACE ("ACE_Shared_Memory_Pool::release"); - - int result = 0; - SHM_TABLE *st = (SHM_TABLE *) this->base_addr_; - - for (size_t counter = 0; - counter < this->max_segments_ && st[counter].used_ == 1; - counter++) - if (ACE_OS::shmctl (st[counter].shmid_, IPC_RMID, 0) == -1) - result = -1; - - return result; -} -#endif /* !ACE_LACKS_SYSV_SHMEM */ |