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Data Structures | Typedefs | Enumerations | Functions | Variables
vspace::internals Namespace Reference

Data Structures

class  FastLock
 
struct  ProcessInfo
 
struct  MetaPage
 
struct  ProcessChannel
 
struct  Block
 
struct  VSeg
 
struct  VMem
 
struct  refcount_t
 
class  Mutex
 

Typedefs

typedef size_t segaddr_t
 
typedef size_t vaddr_t
 
typedef int ipc_signal_t
 

Enumerations

enum  SignalState { Waiting = 0 , Pending = 1 , Accepted = 2 }
 

Functions

static void lock_allocator ()
 
static void unlock_allocator ()
 
static void print_freelists ()
 
void vmem_free (vaddr_t vaddr)
 
vaddr_t vmem_alloc (size_t size)
 
void init_flock_struct (struct flock &lock_info, size_t offset, size_t len, bool lock)
 
void lock_file (int fd, size_t offset, size_t len)
 
void unlock_file (int fd, size_t offset, size_t len)
 
void lock_metapage ()
 
void unlock_metapage ()
 
void init_metapage (bool create)
 
static void lock_process (int processno)
 
static void unlock_process (int processno)
 
static ProcessInfoprocess_info (int processno)
 
bool send_signal (int processno, ipc_signal_t sig, bool lock)
 
ipc_signal_t check_signal (bool resume, bool lock)
 
void accept_signals ()
 
ipc_signal_t wait_signal (bool lock)
 
void drop_pending_signals ()
 
Blockblock_ptr (vaddr_t vaddr)
 
static int find_level (size_t size)
 
static segaddr_t find_buddy (segaddr_t addr, int level)
 
static vaddr_t allocated_ptr_to_vaddr (void *ptr)
 

Variables

size_t config [4] = { METABLOCK_SIZE, MAX_PROCESS, SEGMENT_SIZE, MAX_SEGMENTS }
 
const segaddr_t SEGADDR_NULL = ~(segaddr_t) 0
 
const vaddr_t VADDR_NULL = ~(segaddr_t) 0
 
static const int MAX_PROCESS = 64
 
static const size_t METABLOCK_SIZE = 128 * 1024
 
static const int LOG2_SEGMENT_SIZE = 28
 
static const int LOG2_MAX_SEGMENTS = 10
 
static const size_t MAX_SEGMENTS = 1 << LOG2_MAX_SEGMENTS
 
static const size_t SEGMENT_SIZE = 1 << LOG2_SEGMENT_SIZE
 
static const size_t SEGMENT_MASK = (SEGMENT_SIZE - 1)
 
static VMemvmem = VMem::vmem_global
 

Data Structure Documentation

◆ vspace::internals::ProcessInfo

struct vspace::internals::ProcessInfo

Definition at line 1499 of file vspace.h.

Data Fields
pid_t pid
ipc_signal_t signal
SignalState sigstate

◆ vspace::internals::MetaPage

struct vspace::internals::MetaPage

Definition at line 1508 of file vspace.h.

Data Fields
FastLock allocator_lock
size_t config_header[4]
vaddr_t freelist[LOG2_SEGMENT_SIZE+1]
ProcessInfo process_info[MAX_PROCESS]
int segment_count

◆ vspace::internals::ProcessChannel

struct vspace::internals::ProcessChannel

Definition at line 1525 of file vspace.h.

Data Fields
int fd_read
int fd_write

Typedef Documentation

◆ ipc_signal_t

Definition at line 1481 of file vspace.h.

◆ segaddr_t

Definition at line 1412 of file vspace.h.

◆ vaddr_t

Definition at line 1414 of file vspace.h.

Enumeration Type Documentation

◆ SignalState

Enumerator
Waiting 
Pending 
Accepted 

Definition at line 1493 of file vspace.h.

1493  {
1494  Waiting = 0,
1495  Pending = 1,
1496  Accepted = 2,
1497 };

Function Documentation

◆ accept_signals()

void vspace::internals::accept_signals ( )

Definition at line 965 of file vspace.cc.

965  {
969 }
static void unlock_process(int processno)
Definition: vspace.cc:895
static void lock_process(int processno)
Definition: vspace.cc:889
static ProcessInfo & process_info(int processno)
Definition: vspace.cc:901
static VMem & vmem
Definition: vspace.h:1635

◆ allocated_ptr_to_vaddr()

static vaddr_t vspace::internals::allocated_ptr_to_vaddr ( void *  ptr)
inlinestatic

Definition at line 1697 of file vspace.h.

1697  {
1698  char *addr = (char *) ptr - sizeof(Block);
1699  vaddr_t info = ((Block *) addr)->prev;
1700  int seg = info & (MAX_SEGMENTS - 1);
1701  unsigned char *segstart = vmem.segments[seg].base;
1702  size_t offset = (unsigned char *) ptr - segstart;
1703  return (seg << LOG2_SEGMENT_SIZE) | offset;
1704 }
const ExtensionInfo & info
< [in] sqrfree poly
STATIC_VAR int offset
Definition: janet.cc:29
size_t vaddr_t
Definition: vspace.h:1414
static const size_t MAX_SEGMENTS
Definition: vspace.h:1423
static const int LOG2_SEGMENT_SIZE
Definition: vspace.h:1421
VSeg segments[MAX_SEGMENTS]
Definition: vspace.h:1594
unsigned char * base
Definition: vspace.h:1567

◆ block_ptr()

Block* vspace::internals::block_ptr ( vaddr_t  vaddr)
inline

Definition at line 1637 of file vspace.h.

1637  {
1638  return vmem.block_ptr(vaddr);
1639 }
Block * block_ptr(vaddr_t vaddr)
Definition: vspace.h:1610

◆ check_signal()

ipc_signal_t vspace::internals::check_signal ( bool  resume,
bool  lock 
)

Definition at line 928 of file vspace.cc.

928  {
930  if (lock)
933  switch (sigstate) {
934  case Waiting:
935  case Pending: {
937  char buf[1];
938  if (lock && sigstate == Waiting) {
940  while (read(fd, buf, 1) != 1) {
941  }
943  } else {
944  while (read(fd, buf, 1) != 1) {
945  }
946  }
949  = resume ? Waiting : Accepted;
950  if (lock)
952  break;
953  }
954  case Accepted:
956  if (resume)
958  if (lock)
960  break;
961  }
962  return result;
963 }
return result
Definition: facAbsBiFact.cc:75
int status read
Definition: si_signals.h:59
int status int void * buf
Definition: si_signals.h:59
int status int fd
Definition: si_signals.h:59
ProcessChannel channels[MAX_PROCESS]
Definition: vspace.h:1595

◆ drop_pending_signals()

void vspace::internals::drop_pending_signals ( )

◆ find_buddy()

static segaddr_t vspace::internals::find_buddy ( segaddr_t  addr,
int  level 
)
inlinestatic

Definition at line 1690 of file vspace.h.

1690  {
1691  return addr ^ (1 << level);
1692 }
int level(const CanonicalForm &f)

◆ find_level()

static int vspace::internals::find_level ( size_t  size)
inlinestatic

Definition at line 1681 of file vspace.h.

1681  {
1682  int level = 0;
1683  while ((1 << (level + 8)) <= size)
1684  level += 8;
1685  while ((1 << level) < size)
1686  level++;
1687  return level;
1688 }
int size(const CanonicalForm &f, const Variable &v)
int size ( const CanonicalForm & f, const Variable & v )
Definition: cf_ops.cc:600

◆ init_flock_struct()

void vspace::internals::init_flock_struct ( struct flock &  lock_info,
size_t  offset,
size_t  len,
bool  lock 
)

Definition at line 842 of file vspace.cc.

843  {
844  lock_info.l_start = offset;
845  lock_info.l_len = len;
846  lock_info.l_pid = 0;
847  lock_info.l_type = lock ? F_WRLCK : F_UNLCK;
848  lock_info.l_whence = SEEK_SET;
849 }
#define SEEK_SET
Definition: mod2.h:113

◆ init_metapage()

void vspace::internals::init_metapage ( bool  create)

Definition at line 871 of file vspace.cc.

871  {
872  if (create)
873  ftruncate(vmem.fd, METABLOCK_SIZE);
874  vmem.metapage = (MetaPage *) mmap(
875  NULL, METABLOCK_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, vmem.fd, 0);
876  if (create) {
877  std::memcpy(vmem.metapage->config_header, config, sizeof(config));
878  for (int i = 0; i <= LOG2_SEGMENT_SIZE; i++) {
880  }
882  vmem.metapage->allocator_lock = FastLock(metapageaddr(allocator_lock));
883  } else {
884  assert(std::memcmp(vmem.metapage->config_header, config,
885  sizeof(config)) != 0);
886  }
887 }
int i
Definition: cfEzgcd.cc:132
NodeM * create()
Definition: janet.cc:757
const vaddr_t VADDR_NULL
Definition: vspace.h:1417
vaddr_t freelist[LOG2_SEGMENT_SIZE+1]
Definition: vspace.h:1511
static const size_t METABLOCK_SIZE
Definition: vspace.h:1420
size_t config[4]
Definition: vspace.cc:569
internals::Mutex FastLock
Definition: vspace.h:2340
#define NULL
Definition: omList.c:12
MetaPage * metapage
Definition: vspace.h:1589
#define assert(A)
Definition: svd_si.h:3
#define metapageaddr(field)
Definition: vspace.cc:576

◆ lock_allocator()

static void vspace::internals::lock_allocator ( )
static

Definition at line 716 of file vspace.cc.

716  {
718 }

◆ lock_file()

void vspace::internals::lock_file ( int  fd,
size_t  offset,
size_t  len 
)

Definition at line 851 of file vspace.cc.

851  {
852  struct flock lock_info;
853  init_flock_struct(lock_info, offset, len, true);
854  fcntl(fd, F_SETLKW, &lock_info);
855 }
void init_flock_struct(struct flock &lock_info, size_t offset, size_t len, bool lock)
Definition: vspace.cc:842

◆ lock_metapage()

void vspace::internals::lock_metapage ( )

Definition at line 863 of file vspace.cc.

863  {
864  lock_file(vmem.fd, 0);
865 }
void lock_file(int fd, size_t offset, size_t len)
Definition: vspace.cc:851

◆ lock_process()

static void vspace::internals::lock_process ( int  processno)
static

Definition at line 889 of file vspace.cc.

889  {
890  lock_file(vmem.fd,
892  + sizeof(ProcessInfo) * vmem.current_process);
893 }

◆ print_freelists()

static void vspace::internals::print_freelists ( )
static

Definition at line 724 of file vspace.cc.

724  {
725  for (int i = 0; i <= LOG2_SEGMENT_SIZE; i++) {
726  vaddr_t vaddr = vmem.freelist[i];
727  if (vaddr != VADDR_NULL) {
728  std::printf("%2d: %ld", i, vaddr);
729  vaddr_t prev = block_ptr(vaddr)->prev;
730  if (prev != VADDR_NULL) {
731  std::printf("(%ld)", prev);
732  }
733  assert(block_ptr(vaddr)->prev == VADDR_NULL);
734  for (;;) {
735  vaddr_t last_vaddr = vaddr;
736  Block *block = block_ptr(vaddr);
737  vaddr = block->next;
738  if (vaddr == VADDR_NULL)
739  break;
740  std::printf(" -> %ld", vaddr);
741  vaddr_t prev = block_ptr(vaddr)->prev;
742  if (prev != last_vaddr) {
743  std::printf("(%ld)", prev);
744  }
745  }
746  std::printf("\n");
747  }
748  }
749  std::fflush(stdout);
750 }
Block * block_ptr(vaddr_t vaddr)
Definition: vspace.h:1637
#define block
Definition: scanner.cc:666

◆ process_info()

static ProcessInfo& vspace::internals::process_info ( int  processno)
static

Definition at line 901 of file vspace.cc.

901  {
902  return vmem.metapage->process_info[processno];
903 }
ProcessInfo process_info[MAX_PROCESS]
Definition: vspace.h:1513

◆ send_signal()

bool vspace::internals::send_signal ( int  processno,
ipc_signal_t  sig,
bool  lock 
)

Definition at line 905 of file vspace.cc.

905  {
906  if (lock)
907  lock_process(processno);
908  if (process_info(processno).sigstate != Waiting) {
909  unlock_process(processno);
910  return false;
911  }
912  if (processno == vmem.current_process) {
913  process_info(processno).sigstate = Accepted;
914  process_info(processno).signal = sig;
915  } else {
916  process_info(processno).sigstate = Pending;
917  process_info(processno).signal = sig;
918  int fd = vmem.channels[processno].fd_write;
919  char buf[1] = { 0 };
920  while (write(fd, buf, 1) != 1) {
921  }
922  }
923  if (lock)
924  unlock_process(processno);
925  return true;
926 }
int status int void size_t count write
Definition: si_signals.h:67

◆ unlock_allocator()

static void vspace::internals::unlock_allocator ( )
static

Definition at line 720 of file vspace.cc.

720  {
722 }

◆ unlock_file()

void vspace::internals::unlock_file ( int  fd,
size_t  offset,
size_t  len 
)

Definition at line 857 of file vspace.cc.

857  {
858  struct flock lock_info;
859  init_flock_struct(lock_info, offset, len, false);
860  fcntl(fd, F_SETLKW, &lock_info);
861 }

◆ unlock_metapage()

void vspace::internals::unlock_metapage ( )

Definition at line 867 of file vspace.cc.

867  {
868  unlock_file(vmem.fd, 0);
869 }
void unlock_file(int fd, size_t offset, size_t len)
Definition: vspace.cc:857

◆ unlock_process()

static void vspace::internals::unlock_process ( int  processno)
static

Definition at line 895 of file vspace.cc.

895  {
898  + sizeof(ProcessInfo) * vmem.current_process);
899 }

◆ vmem_alloc()

vaddr_t vspace::internals::vmem_alloc ( size_t  size)

Definition at line 800 of file vspace.cc.

800  {
801  lock_allocator();
802  size_t alloc_size = size + offsetof(Block, data);
803  int level = find_level(alloc_size);
804  int flevel = level;
805  while (flevel < LOG2_SEGMENT_SIZE && vmem.freelist[flevel] == VADDR_NULL)
806  flevel++;
807  if (vmem.freelist[flevel] == VADDR_NULL) {
808  vmem.add_segment();
809  }
811  while (flevel > level) {
812  // get and split a block
813  vaddr_t blockaddr = vmem.freelist[flevel];
814  assert((blockaddr & ((1 << flevel) - 1)) == 0);
815  Block *block = vmem.block_ptr(blockaddr);
816  vmem.freelist[flevel] = block->next;
817  if (vmem.freelist[flevel] != VADDR_NULL)
819  vaddr_t blockaddr2 = blockaddr + (1 << (flevel - 1));
820  Block *block2 = vmem.block_ptr(blockaddr2);
821  flevel--;
822  block2->next = vmem.freelist[flevel];
823  block2->prev = blockaddr;
824  block->next = blockaddr2;
825  block->prev = VADDR_NULL;
826  // block->prev == VADDR_NULL already.
827  vmem.freelist[flevel] = blockaddr;
828  }
830  Block *block = vmem.block_ptr(vmem.freelist[level]);
831  vaddr_t vaddr = vmem.freelist[level];
832  vaddr_t result = vaddr + offsetof(Block, data);
833  vmem.freelist[level] = block->next;
834  if (block->next != VADDR_NULL)
835  vmem.block_ptr(block->next)->prev = VADDR_NULL;
836  block->mark_as_allocated(vaddr, level);
838  memset(block->data, 0, size);
839  return result;
840 }
static void lock_allocator()
Definition: vspace.cc:716
static int find_level(size_t size)
Definition: vspace.h:1681
static void unlock_allocator()
Definition: vspace.cc:720
void ensure_is_mapped(vaddr_t vaddr)
Definition: vspace.h:1615

◆ vmem_free()

void vspace::internals::vmem_free ( vaddr_t  vaddr)

Definition at line 752 of file vspace.cc.

752  {
753  lock_allocator();
754  vaddr -= offsetof(Block, data);
755  vmem.ensure_is_mapped(vaddr);
756  size_t segno = vmem.segment_no(vaddr);
757  VSeg seg = vmem.segment(vaddr);
758  segaddr_t addr = vmem.segaddr(vaddr);
759  int level = seg.block_ptr(addr)->level();
760  assert(!seg.is_free(addr));
761  while (level < LOG2_SEGMENT_SIZE) {
762  segaddr_t buddy = find_buddy(addr, level);
763  Block *block = seg.block_ptr(buddy);
764  // is buddy free and at the same level?
765  if (!block->is_free() || block->level() != level)
766  break;
767  // remove buddy from freelist.
768  Block *prev = vmem.block_ptr(block->prev);
769  Block *next = vmem.block_ptr(block->next);
770  block->data[0] = level;
771  if (prev) {
772  assert(prev->next == vmem.vaddr(segno, buddy));
773  prev->next = block->next;
774  } else {
775  // head of freelist.
776  assert(vmem.freelist[level] == vmem.vaddr(segno, buddy));
777  vmem.freelist[level] = block->next;
778  }
779  if (next) {
780  assert(next->prev == vmem.vaddr(segno, buddy));
781  next->prev = block->prev;
782  }
783  // coalesce block with buddy
784  level++;
785  if (buddy < addr)
786  addr = buddy;
787  }
788  // Add coalesced block to free list
789  Block *block = seg.block_ptr(addr);
790  block->prev = VADDR_NULL;
791  block->next = vmem.freelist[level];
792  block->mark_as_free(level);
793  vaddr_t blockaddr = vmem.vaddr(segno, addr);
794  if (block->next != VADDR_NULL)
795  vmem.block_ptr(block->next)->prev = blockaddr;
796  vmem.freelist[level] = blockaddr;
798 }
ListNode * next
Definition: janet.h:31
static segaddr_t find_buddy(segaddr_t addr, int level)
Definition: vspace.h:1690
size_t segaddr_t
Definition: vspace.h:1412
size_t segment_no(vaddr_t vaddr)
Definition: vspace.h:1599
VSeg segment(vaddr_t vaddr)
Definition: vspace.h:1596
vaddr_t vaddr(size_t segno, segaddr_t addr)
Definition: vspace.h:1602
segaddr_t segaddr(vaddr_t vaddr)
Definition: vspace.h:1605

◆ wait_signal()

ipc_signal_t vspace::internals::wait_signal ( bool  lock)

Definition at line 971 of file vspace.cc.

971  {
972  return check_signal(true, lock);
973 }
ipc_signal_t check_signal(bool resume, bool lock)
Definition: vspace.cc:928

Variable Documentation

◆ config

size_t vspace::internals::config = { METABLOCK_SIZE, MAX_PROCESS, SEGMENT_SIZE, MAX_SEGMENTS }

Definition at line 568 of file vspace.cc.

◆ LOG2_MAX_SEGMENTS

const int vspace::internals::LOG2_MAX_SEGMENTS = 10
static

Definition at line 1422 of file vspace.h.

◆ LOG2_SEGMENT_SIZE

const int vspace::internals::LOG2_SEGMENT_SIZE = 28
static

Definition at line 1421 of file vspace.h.

◆ MAX_PROCESS

const int vspace::internals::MAX_PROCESS = 64
static

Definition at line 1419 of file vspace.h.

◆ MAX_SEGMENTS

const size_t vspace::internals::MAX_SEGMENTS = 1 << LOG2_MAX_SEGMENTS
static

Definition at line 1423 of file vspace.h.

◆ METABLOCK_SIZE

const size_t vspace::internals::METABLOCK_SIZE = 128 * 1024
static

Definition at line 1420 of file vspace.h.

◆ SEGADDR_NULL

const segaddr_t vspace::internals::SEGADDR_NULL = ~(segaddr_t) 0

Definition at line 1416 of file vspace.h.

◆ SEGMENT_MASK

const size_t vspace::internals::SEGMENT_MASK = (SEGMENT_SIZE - 1)
static

Definition at line 1425 of file vspace.h.

◆ SEGMENT_SIZE

const size_t vspace::internals::SEGMENT_SIZE = 1 << LOG2_SEGMENT_SIZE
static

Definition at line 1424 of file vspace.h.

◆ VADDR_NULL

const vaddr_t vspace::internals::VADDR_NULL = ~(segaddr_t) 0

Definition at line 1417 of file vspace.h.

◆ vmem

VMem& vspace::internals::vmem = VMem::vmem_global
static

Definition at line 1635 of file vspace.h.