My Project
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
 
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 251 of file vspace.h.

Member Function Documentation

◆ add_segment()

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

Definition at line 109 of file vspace.cc.

109 {
110 int seg = metapage->segment_count++;
112 void *map_addr = mmap_segment(seg);
113 segments[seg] = VSeg(map_addr);
114 Block *top = block_ptr(seg * SEGMENT_SIZE);
115 top->next = freelist[LOG2_SEGMENT_SIZE];
116 top->prev = VADDR_NULL;
118}
const vaddr_t VADDR_NULL
Definition: vspace.h:84
static const size_t SEGMENT_SIZE
Definition: vspace.h:91
static const size_t METABLOCK_SIZE
Definition: vspace.h:87
static const int LOG2_SEGMENT_SIZE
Definition: vspace.h:88
Block * block_ptr(vaddr_t vaddr)
Definition: vspace.h:274
void * mmap_segment(int seg)
Definition: vspace.cc:95
MetaPage * metapage
Definition: vspace.h:253
vaddr_t * freelist
Definition: vspace.h:257
VSeg segments[MAX_SEGMENTS]
Definition: vspace.h:258

◆ block_ptr()

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

Definition at line 274 of file vspace.h.

274 {
275 if (vaddr == VADDR_NULL)
276 return NULL;
277 return (Block *) (segment(vaddr).base + segaddr(vaddr));
278 }
#define NULL
Definition: auxiliary.h:104
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
unsigned char * base
Definition: vspace.h:234

◆ deinit()

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

Definition at line 74 of file vspace.cc.

74 {
75 if (file_handle) {
76 fclose(file_handle);
78 } else {
79 close(fd);
80 }
81 munmap(metapage, METABLOCK_SIZE);
82 metapage = NULL;
83 current_process = -1;
84 freelist = NULL;
85 for (int i = 0; i < MAX_SEGMENTS; i++) {
86 if (segments[i].base) munmap(segments[i].base, SEGMENT_SIZE);
87 segments[i] = NULL;
88 }
89 for (int i = 0; i < MAX_PROCESS; i++) {
90 close(channels[i].fd_read);
91 close(channels[i].fd_write);
92 }
93}
int i
Definition: cfEzgcd.cc:132
char N base
Definition: ValueTraits.h:144
static const size_t MAX_SEGMENTS
Definition: vspace.h:90
static const int MAX_PROCESS
Definition: vspace.h:86
ProcessChannel channels[MAX_PROCESS]
Definition: vspace.h:259

◆ ensure_is_mapped()

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

Definition at line 279 of file vspace.h.

279 {
280 int seg = vaddr >> LOG2_SEGMENT_SIZE;
281 if (segments[seg].base != NULL)
282 return;
283 segments[seg] = mmap_segment(seg);
284 }

◆ filesize()

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

Definition at line 23 of file vspace.cc.

23 {
24 struct stat stat;
25 fstat(fd, &stat);
26 return stat.st_size;
27}

◆ init() [1/3]

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

Definition at line 52 of file vspace.cc.

52 {
53 FILE *fp = tmpfile();
54 Status result = init(fileno(fp));
55 if (!result.ok())
56 return result;
59 metapage->process_info[0].pid = getpid();
60 return Status(ErrNone);
61}
CanonicalForm fp
Definition: cfModGcd.cc:4104
return result
Definition: facAbsBiFact.cc:75
ProcessInfo process_info[MAX_PROCESS]
Definition: vspace.h:180
@ ErrNone
Definition: vspace.h:43

◆ init() [2/3]

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

Definition at line 63 of file vspace.cc.

63 {
64 int fd = open(path, O_RDWR | O_CREAT, 0600);
65 if (fd < 0)
66 return Status(ErrFile);
67 init(fd);
69 // TODO: enter process in meta table
71 return Status(ErrNone);
72}
void unlock_metapage()
Definition: vspace.cc:310
void lock_metapage()
Definition: vspace.cc:306
@ ErrFile
Definition: vspace.h:45
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 29 of file vspace.cc.

29 {
30 this->fd = fd;
31 for (int i = 0; i < MAX_SEGMENTS; i++)
32 segments[i] = VSeg(NULL);
33 for (int i = 0; i < MAX_PROCESS; i++) {
34 int channel[2];
35 if (pipe(channel) < 0) {
36 for (int j = 0; j < i; j++) {
37 close(channels[j].fd_read);
38 close(channels[j].fd_write);
39 }
40 return Status(ErrOS);
41 }
42 channels[i].fd_read = channel[0];
43 channels[i].fd_write = channel[1];
44 }
46 init_metapage(filesize() == 0);
49 return Status(ErrNone);
50}
int j
Definition: facHensel.cc:110
vaddr_t freelist[LOG2_SEGMENT_SIZE+1]
Definition: vspace.h:178
void init_metapage(bool create)
Definition: vspace.cc:314
@ ErrOS
Definition: vspace.h:47

◆ mmap_segment()

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

Definition at line 95 of file vspace.cc.

95 {
97 void *map = mmap(NULL, SEGMENT_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd,
99 if (map == MAP_FAILED) {
100 // This is an "impossible to proceed from here, because system state
101 // is impossible to proceed from" situation, so we abort the program.
102 perror("mmap");
103 abort();
104 }
106 return map;
107}
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 269 of file vspace.h.

269 {
270 if (vaddr == VADDR_NULL)
271 return SEGADDR_NULL;
272 return vaddr & SEGMENT_MASK;
273 }
static const size_t SEGMENT_MASK
Definition: vspace.h:92
const segaddr_t SEGADDR_NULL
Definition: vspace.h:83

◆ segment()

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

Definition at line 260 of file vspace.h.

260 {
262 }

◆ segment_no()

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

Definition at line 263 of file vspace.h.

263 {
264 return vaddr >> LOG2_SEGMENT_SIZE;
265 }

◆ to_ptr()

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

Definition at line 285 of file vspace.h.

285 {
286 if (vaddr == VADDR_NULL)
287 return NULL;
289 return segment(vaddr).ptr(segaddr(vaddr));
290 }
void ensure_is_mapped(vaddr_t vaddr)
Definition: vspace.h:279
void * ptr(segaddr_t addr)
Definition: vspace.h:242

◆ vaddr()

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

Definition at line 266 of file vspace.h.

266 {
267 return (segno << LOG2_SEGMENT_SIZE) | addr;
268 }

Field Documentation

◆ channels

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

Definition at line 259 of file vspace.h.

◆ current_process

int vspace::internals::VMem::current_process

Definition at line 256 of file vspace.h.

◆ fd

int vspace::internals::VMem::fd

Definition at line 254 of file vspace.h.

◆ file_handle

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

Definition at line 255 of file vspace.h.

◆ freelist

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

Definition at line 257 of file vspace.h.

◆ metapage

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

Definition at line 253 of file vspace.h.

◆ segments

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

Definition at line 258 of file vspace.h.

◆ vmem_global

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

Definition at line 252 of file vspace.h.


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