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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 166 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 175 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 192 of file vspace.h.

Data Fields
int fd_read
int fd_write

Typedef Documentation

◆ ipc_signal_t

Definition at line 148 of file vspace.h.

◆ segaddr_t

Definition at line 79 of file vspace.h.

◆ vaddr_t

Definition at line 81 of file vspace.h.

Enumeration Type Documentation

◆ SignalState

Enumerator
Waiting 
Pending 
Accepted 

Definition at line 160 of file vspace.h.

160  {
161  Waiting = 0,
162  Pending = 1,
163  Accepted = 2,
164 };

Function Documentation

◆ accept_signals()

void vspace::internals::accept_signals ( )

Definition at line 407 of file vspace.cc.

407  {
411 }
static void unlock_process(int processno)
Definition: vspace.cc:337
static void lock_process(int processno)
Definition: vspace.cc:331
static ProcessInfo & process_info(int processno)
Definition: vspace.cc:343
static VMem & vmem
Definition: vspace.h:300

◆ allocated_ptr_to_vaddr()

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

Definition at line 362 of file vspace.h.

362  {
363  char *addr = (char *) ptr - sizeof(Block);
364  vaddr_t info = ((Block *) addr)->prev;
365  int seg = info & (MAX_SEGMENTS - 1);
366  unsigned char *segstart = vmem.segments[seg].base;
367  size_t offset = (unsigned char *) ptr - segstart;
368  return (seg << LOG2_SEGMENT_SIZE) | offset;
369 }
const ExtensionInfo & info
< [in] sqrfree poly
STATIC_VAR int offset
Definition: janet.cc:29
size_t vaddr_t
Definition: vspace.h:81
static const size_t MAX_SEGMENTS
Definition: vspace.h:90
static const int LOG2_SEGMENT_SIZE
Definition: vspace.h:88
VSeg segments[MAX_SEGMENTS]
Definition: vspace.h:258
unsigned char * base
Definition: vspace.h:234

◆ block_ptr()

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

Definition at line 302 of file vspace.h.

302  {
303  return vmem.block_ptr(vaddr);
304 }
Block * block_ptr(vaddr_t vaddr)
Definition: vspace.h:274

◆ check_signal()

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

Definition at line 370 of file vspace.cc.

370  {
372  if (lock)
375  switch (sigstate) {
376  case Waiting:
377  case Pending: {
379  char buf[1];
380  if (lock && sigstate == Waiting) {
382  while (read(fd, buf, 1) != 1) {
383  }
385  } else {
386  while (read(fd, buf, 1) != 1) {
387  }
388  }
391  = resume ? Waiting : Accepted;
392  if (lock)
394  break;
395  }
396  case Accepted:
398  if (resume)
400  if (lock)
402  break;
403  }
404  return result;
405 }
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:259

◆ 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 355 of file vspace.h.

355  {
356  return addr ^ (1 << level);
357 }
int level(const CanonicalForm &f)

◆ find_level()

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

Definition at line 346 of file vspace.h.

346  {
347  int level = 0;
348  while ((1 << (level + 8)) <= size)
349  level += 8;
350  while ((1 << level) < size)
351  level++;
352  return level;
353 }
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 285 of file vspace.cc.

286  {
287  lock_info.l_start = offset;
288  lock_info.l_len = len;
289  lock_info.l_pid = 0;
290  lock_info.l_type = lock ? F_WRLCK : F_UNLCK;
291  lock_info.l_whence = SEEK_SET;
292 }
#define SEEK_SET
Definition: mod2.h:113

◆ init_metapage()

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

Definition at line 314 of file vspace.cc.

314  {
315  if (create)
316  ftruncate(vmem.fd, METABLOCK_SIZE);
317  vmem.metapage = (MetaPage *) mmap(
318  NULL, METABLOCK_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, vmem.fd, 0);
319  if (create) {
320  memcpy(vmem.metapage->config_header, config, sizeof(config));
321  for (int i = 0; i <= LOG2_SEGMENT_SIZE; i++) {
323  }
325  vmem.metapage->allocator_lock = FastLock(metapageaddr(allocator_lock));
326  } else {
327  assert(memcmp(vmem.metapage->config_header, config, sizeof(config)) != 0);
328  }
329 }
int i
Definition: cfEzgcd.cc:132
NodeM * create()
Definition: janet.cc:757
const vaddr_t VADDR_NULL
Definition: vspace.h:84
vaddr_t freelist[LOG2_SEGMENT_SIZE+1]
Definition: vspace.h:178
static const size_t METABLOCK_SIZE
Definition: vspace.h:87
size_t config[4]
Definition: vspace.cc:13
internals::Mutex FastLock
Definition: vspace.h:1005
#define NULL
Definition: omList.c:12
MetaPage * metapage
Definition: vspace.h:253
#define assert(A)
Definition: svd_si.h:3
#define metapageaddr(field)
Definition: vspace.cc:20

◆ lock_allocator()

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

Definition at line 159 of file vspace.cc.

159  {
161 }

◆ lock_file()

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

Definition at line 294 of file vspace.cc.

294  {
295  struct flock lock_info;
296  init_flock_struct(lock_info, offset, len, true);
297  fcntl(fd, F_SETLKW, &lock_info);
298 }
void init_flock_struct(struct flock &lock_info, size_t offset, size_t len, bool lock)
Definition: vspace.cc:285

◆ lock_metapage()

void vspace::internals::lock_metapage ( )

Definition at line 306 of file vspace.cc.

306  {
307  lock_file(vmem.fd, 0);
308 }
void lock_file(int fd, size_t offset, size_t len)
Definition: vspace.cc:294

◆ lock_process()

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

Definition at line 331 of file vspace.cc.

331  {
332  lock_file(vmem.fd,
334  + sizeof(ProcessInfo) * vmem.current_process);
335 }

◆ print_freelists()

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

Definition at line 167 of file vspace.cc.

167  {
168  for (int i = 0; i <= LOG2_SEGMENT_SIZE; i++) {
169  vaddr_t vaddr = vmem.freelist[i];
170  if (vaddr != VADDR_NULL) {
171  printf("%2d: %ld", i, vaddr);
172  vaddr_t prev = block_ptr(vaddr)->prev;
173  if (prev != VADDR_NULL) {
174  printf("(%ld)", prev);
175  }
176  assert(block_ptr(vaddr)->prev == VADDR_NULL);
177  for (;;) {
178  vaddr_t last_vaddr = vaddr;
179  Block *block = block_ptr(vaddr);
180  vaddr = block->next;
181  if (vaddr == VADDR_NULL)
182  break;
183  printf(" -> %ld", vaddr);
184  vaddr_t prev = block_ptr(vaddr)->prev;
185  if (prev != last_vaddr) {
186  printf("(%ld)", prev);
187  }
188  }
189  printf("\n");
190  }
191  }
192  fflush(stdout);
193 }
Block * block_ptr(vaddr_t vaddr)
Definition: vspace.h:302
#define block
Definition: scanner.cc:666
vaddr_t * freelist
Definition: vspace.h:257

◆ process_info()

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

Definition at line 343 of file vspace.cc.

343  {
344  return vmem.metapage->process_info[processno];
345 }
ProcessInfo process_info[MAX_PROCESS]
Definition: vspace.h:180

◆ send_signal()

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

Definition at line 347 of file vspace.cc.

347  {
348  if (lock)
349  lock_process(processno);
350  if (process_info(processno).sigstate != Waiting) {
351  unlock_process(processno);
352  return false;
353  }
354  if (processno == vmem.current_process) {
355  process_info(processno).sigstate = Accepted;
356  process_info(processno).signal = sig;
357  } else {
358  process_info(processno).sigstate = Pending;
359  process_info(processno).signal = sig;
360  int fd = vmem.channels[processno].fd_write;
361  char buf[1] = { 0 };
362  while (write(fd, buf, 1) != 1) {
363  }
364  }
365  if (lock)
366  unlock_process(processno);
367  return true;
368 }
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 163 of file vspace.cc.

163  {
165 }

◆ unlock_file()

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

Definition at line 300 of file vspace.cc.

300  {
301  struct flock lock_info;
302  init_flock_struct(lock_info, offset, len, false);
303  fcntl(fd, F_SETLKW, &lock_info);
304 }

◆ unlock_metapage()

void vspace::internals::unlock_metapage ( )

Definition at line 310 of file vspace.cc.

310  {
311  unlock_file(vmem.fd, 0);
312 }
void unlock_file(int fd, size_t offset, size_t len)
Definition: vspace.cc:300

◆ unlock_process()

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

Definition at line 337 of file vspace.cc.

337  {
340  + sizeof(ProcessInfo) * vmem.current_process);
341 }

◆ vmem_alloc()

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

Definition at line 243 of file vspace.cc.

243  {
244  lock_allocator();
245  size_t alloc_size = size + offsetof(Block, data);
246  int level = find_level(alloc_size);
247  int flevel = level;
248  while (flevel < LOG2_SEGMENT_SIZE && vmem.freelist[flevel] == VADDR_NULL)
249  flevel++;
250  if (vmem.freelist[flevel] == VADDR_NULL) {
251  vmem.add_segment();
252  }
254  while (flevel > level) {
255  // get and split a block
256  vaddr_t blockaddr = vmem.freelist[flevel];
257  assert((blockaddr & ((1 << flevel) - 1)) == 0);
258  Block *block = vmem.block_ptr(blockaddr);
259  vmem.freelist[flevel] = block->next;
260  if (vmem.freelist[flevel] != VADDR_NULL)
262  vaddr_t blockaddr2 = blockaddr + (1 << (flevel - 1));
263  Block *block2 = vmem.block_ptr(blockaddr2);
264  flevel--;
265  block2->next = vmem.freelist[flevel];
266  block2->prev = blockaddr;
267  block->next = blockaddr2;
268  block->prev = VADDR_NULL;
269  // block->prev == VADDR_NULL already.
270  vmem.freelist[flevel] = blockaddr;
271  }
273  Block *block = vmem.block_ptr(vmem.freelist[level]);
274  vaddr_t vaddr = vmem.freelist[level];
275  vaddr_t result = vaddr + offsetof(Block, data);
276  vmem.freelist[level] = block->next;
277  if (block->next != VADDR_NULL)
278  vmem.block_ptr(block->next)->prev = VADDR_NULL;
279  block->mark_as_allocated(vaddr, level);
281  memset(block->data, 0, size);
282  return result;
283 }
static void lock_allocator()
Definition: vspace.cc:159
static int find_level(size_t size)
Definition: vspace.h:346
static void unlock_allocator()
Definition: vspace.cc:163
void ensure_is_mapped(vaddr_t vaddr)
Definition: vspace.h:279

◆ vmem_free()

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

Definition at line 195 of file vspace.cc.

195  {
196  lock_allocator();
197  vaddr -= offsetof(Block, data);
198  vmem.ensure_is_mapped(vaddr);
199  size_t segno = vmem.segment_no(vaddr);
200  VSeg seg = vmem.segment(vaddr);
201  segaddr_t addr = vmem.segaddr(vaddr);
202  int level = seg.block_ptr(addr)->level();
203  assert(!seg.is_free(addr));
204  while (level < LOG2_SEGMENT_SIZE) {
205  segaddr_t buddy = find_buddy(addr, level);
206  Block *block = seg.block_ptr(buddy);
207  // is buddy free and at the same level?
208  if (!block->is_free() || block->level() != level)
209  break;
210  // remove buddy from freelist.
211  Block *prev = vmem.block_ptr(block->prev);
212  Block *next = vmem.block_ptr(block->next);
213  block->data[0] = level;
214  if (prev) {
215  assert(prev->next == vmem.vaddr(segno, buddy));
216  prev->next = block->next;
217  } else {
218  // head of freelist.
219  assert(vmem.freelist[level] == vmem.vaddr(segno, buddy));
220  vmem.freelist[level] = block->next;
221  }
222  if (next) {
223  assert(next->prev == vmem.vaddr(segno, buddy));
224  next->prev = block->prev;
225  }
226  // coalesce block with buddy
227  level++;
228  if (buddy < addr)
229  addr = buddy;
230  }
231  // Add coalesced block to free list
232  Block *block = seg.block_ptr(addr);
233  block->prev = VADDR_NULL;
234  block->next = vmem.freelist[level];
235  block->mark_as_free(level);
236  vaddr_t blockaddr = vmem.vaddr(segno, addr);
237  if (block->next != VADDR_NULL)
238  vmem.block_ptr(block->next)->prev = blockaddr;
239  vmem.freelist[level] = blockaddr;
241 }
ListNode * next
Definition: janet.h:31
static segaddr_t find_buddy(segaddr_t addr, int level)
Definition: vspace.h:355
size_t segaddr_t
Definition: vspace.h:79
size_t segment_no(vaddr_t vaddr)
Definition: vspace.h:263
VSeg segment(vaddr_t vaddr)
Definition: vspace.h:260
vaddr_t vaddr(size_t segno, segaddr_t addr)
Definition: vspace.h:266
segaddr_t segaddr(vaddr_t vaddr)
Definition: vspace.h:269

◆ wait_signal()

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

Definition at line 413 of file vspace.cc.

413  {
414  return check_signal(true, lock);
415 }
ipc_signal_t check_signal(bool resume, bool lock)
Definition: vspace.cc:370

Variable Documentation

◆ config

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

Definition at line 12 of file vspace.cc.

◆ LOG2_MAX_SEGMENTS

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

Definition at line 89 of file vspace.h.

◆ LOG2_SEGMENT_SIZE

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

Definition at line 88 of file vspace.h.

◆ MAX_PROCESS

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

Definition at line 86 of file vspace.h.

◆ MAX_SEGMENTS

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

Definition at line 90 of file vspace.h.

◆ METABLOCK_SIZE

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

Definition at line 87 of file vspace.h.

◆ SEGADDR_NULL

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

Definition at line 83 of file vspace.h.

◆ SEGMENT_MASK

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

Definition at line 92 of file vspace.h.

◆ SEGMENT_SIZE

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

Definition at line 91 of file vspace.h.

◆ VADDR_NULL

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

Definition at line 84 of file vspace.h.

◆ vmem

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

Definition at line 300 of file vspace.h.