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Public Member Functions | Data Fields | Static Public Attributes
vspace::internals::VMem Struct Reference

#include <vspace.h>

Public Member Functions

VSeg segment (vaddr_t vaddr)
 
size_t segment_no (vaddr_t vaddr)
 
vaddr_t vaddr (size_t segno, segaddr_t addr)
 
segaddr_t segaddr (vaddr_t vaddr)
 
Blockblock_ptr (vaddr_t vaddr)
 
void ensure_is_mapped (vaddr_t vaddr)
 
void * to_ptr (vaddr_t vaddr)
 
size_t filesize ()
 
Status init (int fd)
 
Status init ()
 
Status init (const char *path)
 
void deinit ()
 
void * mmap_segment (int seg)
 
void add_segment ()
 

Data Fields

MetaPagemetapage
 
int fd
 
std::FILE * file_handle
 
int current_process
 
vaddr_tfreelist
 
VSeg segments [MAX_SEGMENTS]
 
ProcessChannel channels [MAX_PROCESS]
 

Static Public Attributes

static VMem vmem_global
 

Detailed Description

Definition at line 1587 of file vspace.h.

Member Function Documentation

◆ add_segment()

void vspace::internals::VMem::add_segment ( )

Definition at line 665 of file vspace.cc.

665  {
666  int seg = metapage->segment_count++;
668  void *map_addr = mmap_segment(seg);
669  segments[seg] = VSeg(map_addr);
670  Block *top = block_ptr(seg * SEGMENT_SIZE);
671  top->next = freelist[LOG2_SEGMENT_SIZE];
672  top->prev = VADDR_NULL;
674 }
const vaddr_t VADDR_NULL
Definition: vspace.h:1417
static const size_t SEGMENT_SIZE
Definition: vspace.h:1424
static const size_t METABLOCK_SIZE
Definition: vspace.h:1420
static const int LOG2_SEGMENT_SIZE
Definition: vspace.h:1421
void * mmap_segment(int seg)
Definition: vspace.cc:651
Block * block_ptr(vaddr_t vaddr)
Definition: vspace.h:1610
MetaPage * metapage
Definition: vspace.h:1589
VSeg segments[MAX_SEGMENTS]
Definition: vspace.h:1594

◆ block_ptr()

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

Definition at line 1610 of file vspace.h.

1610  {
1611  if (vaddr == VADDR_NULL)
1612  return NULL;
1613  return (Block *) (segment(vaddr).base + segaddr(vaddr));
1614  }
#define NULL
Definition: omList.c:12
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
unsigned char * base
Definition: vspace.h:1567

◆ deinit()

void vspace::internals::VMem::deinit ( )

Definition at line 629 of file vspace.cc.

629  {
630  if (file_handle) {
631  fclose(file_handle);
632  file_handle = NULL;
633  } else {
634  close(fd);
635  }
636  munmap(metapage, METABLOCK_SIZE);
637  metapage = NULL;
638  current_process = -1;
639  freelist = NULL;
640  for (int i = 0; i < MAX_SEGMENTS; i++) {
641  if (!segments[i].is_free())
642  munmap(segments[i].base, SEGMENT_SIZE);
643  segments[i] = VSeg(NULL);
644  }
645  for (int i = 0; i < MAX_PROCESS; i++) {
646  close(channels[i].fd_read);
647  close(channels[i].fd_write);
648  }
649 }
int i
Definition: cfEzgcd.cc:132
char N base
Definition: ValueTraits.h:144
static const size_t MAX_SEGMENTS
Definition: vspace.h:1423
static const int MAX_PROCESS
Definition: vspace.h:1419
std::FILE * file_handle
Definition: vspace.h:1591
ProcessChannel channels[MAX_PROCESS]
Definition: vspace.h:1595

◆ ensure_is_mapped()

void vspace::internals::VMem::ensure_is_mapped ( vaddr_t  vaddr)
inline

Definition at line 1615 of file vspace.h.

1615  {
1616  int seg = vaddr >> LOG2_SEGMENT_SIZE;
1617  if (segments[seg].is_free())
1618  segments[seg] = mmap_segment(seg);
1619  }

◆ filesize()

size_t vspace::internals::VMem::filesize ( )

Definition at line 578 of file vspace.cc.

578  {
579  struct stat stat;
580  fstat(fd, &stat);
581  return stat.st_size;
582 }

◆ init() [1/3]

Status vspace::internals::VMem::init ( )

Definition at line 607 of file vspace.cc.

607  {
608  FILE *fp = tmpfile();
609  Status result = init(fileno(fp));
610  if (!result.ok())
611  return result;
612  current_process = 0;
613  file_handle = fp;
614  metapage->process_info[0].pid = getpid();
615  return Status(ErrNone);
616 }
CanonicalForm fp
Definition: cfModGcd.cc:4102
return result
Definition: facAbsBiFact.cc:75
ProcessInfo process_info[MAX_PROCESS]
Definition: vspace.h:1513
@ ErrNone
Definition: vspace.h:1376

◆ init() [2/3]

Status vspace::internals::VMem::init ( const char *  path)

Definition at line 618 of file vspace.cc.

618  {
619  int fd = open(path, O_RDWR | O_CREAT, 0600);
620  if (fd < 0)
621  return Status(ErrFile);
622  init(fd);
623  lock_metapage();
624  // TODO: enter process in meta table
625  unlock_metapage();
626  return Status(ErrNone);
627 }
void unlock_metapage()
Definition: vspace.cc:866
void lock_metapage()
Definition: vspace.cc:862
@ ErrFile
Definition: vspace.h:1378
int status int void size_t count int const void size_t count open
Definition: si_signals.h:73

◆ init() [3/3]

Status vspace::internals::VMem::init ( int  fd)

Definition at line 584 of file vspace.cc.

584  {
585  this->fd = fd;
586  for (int i = 0; i < MAX_SEGMENTS; i++)
587  segments[i] = VSeg(NULL);
588  for (int i = 0; i < MAX_PROCESS; i++) {
589  int channel[2];
590  if (pipe(channel) < 0) {
591  for (int j = 0; j < i; j++) {
592  close(channels[j].fd_read);
593  close(channels[j].fd_write);
594  }
595  return Status(ErrOS);
596  }
597  channels[i].fd_read = channel[0];
598  channels[i].fd_write = channel[1];
599  }
600  lock_metapage();
601  init_metapage(filesize() == 0);
602  unlock_metapage();
604  return Status(ErrNone);
605 }
int j
Definition: facHensel.cc:110
vaddr_t freelist[LOG2_SEGMENT_SIZE+1]
Definition: vspace.h:1511
void init_metapage(bool create)
Definition: vspace.cc:870
@ ErrOS
Definition: vspace.h:1380

◆ mmap_segment()

void * vspace::internals::VMem::mmap_segment ( int  seg)

Definition at line 651 of file vspace.cc.

651  {
652  lock_metapage();
653  void *map = mmap(NULL, SEGMENT_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
654  METABLOCK_SIZE + seg * SEGMENT_SIZE);
655  if (map == MAP_FAILED) {
656  // This is an "impossible to proceed from here, because system state
657  // is impossible to proceed from" situation, so we abort the program.
658  perror("mmap");
659  abort();
660  }
661  unlock_metapage();
662  return map;
663 }
CanonicalForm map(const CanonicalForm &primElem, const Variable &alpha, const CanonicalForm &F, const Variable &beta)
map from to such that is mapped onto
Definition: cf_map_ext.cc:504

◆ segaddr()

segaddr_t vspace::internals::VMem::segaddr ( vaddr_t  vaddr)
inline

Definition at line 1605 of file vspace.h.

1605  {
1606  if (vaddr == VADDR_NULL)
1607  return SEGADDR_NULL;
1608  return vaddr & SEGMENT_MASK;
1609  }
static const size_t SEGMENT_MASK
Definition: vspace.h:1425
const segaddr_t SEGADDR_NULL
Definition: vspace.h:1416

◆ segment()

VSeg vspace::internals::VMem::segment ( vaddr_t  vaddr)
inline

Definition at line 1596 of file vspace.h.

1596  {
1597  return segments[vaddr >> LOG2_SEGMENT_SIZE];
1598  }

◆ segment_no()

size_t vspace::internals::VMem::segment_no ( vaddr_t  vaddr)
inline

Definition at line 1599 of file vspace.h.

1599  {
1600  return vaddr >> LOG2_SEGMENT_SIZE;
1601  }

◆ to_ptr()

void* vspace::internals::VMem::to_ptr ( vaddr_t  vaddr)
inline

Definition at line 1620 of file vspace.h.

1620  {
1621  if (vaddr == VADDR_NULL)
1622  return NULL;
1624  return segment(vaddr).ptr(segaddr(vaddr));
1625  }
void ensure_is_mapped(vaddr_t vaddr)
Definition: vspace.h:1615
void * ptr(segaddr_t addr)
Definition: vspace.h:1578

◆ vaddr()

vaddr_t vspace::internals::VMem::vaddr ( size_t  segno,
segaddr_t  addr 
)
inline

Definition at line 1602 of file vspace.h.

1602  {
1603  return (segno << LOG2_SEGMENT_SIZE) | addr;
1604  }

Field Documentation

◆ channels

ProcessChannel vspace::internals::VMem::channels[MAX_PROCESS]

Definition at line 1595 of file vspace.h.

◆ current_process

int vspace::internals::VMem::current_process

Definition at line 1592 of file vspace.h.

◆ fd

int vspace::internals::VMem::fd

Definition at line 1590 of file vspace.h.

◆ file_handle

std::FILE* vspace::internals::VMem::file_handle

Definition at line 1591 of file vspace.h.

◆ freelist

vaddr_t* vspace::internals::VMem::freelist

Definition at line 1593 of file vspace.h.

◆ metapage

MetaPage* vspace::internals::VMem::metapage

Definition at line 1589 of file vspace.h.

◆ segments

VSeg vspace::internals::VMem::segments[MAX_SEGMENTS]

Definition at line 1594 of file vspace.h.

◆ vmem_global

VMem vspace::internals::VMem::vmem_global
static

Definition at line 1588 of file vspace.h.


The documentation for this struct was generated from the following files: