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Overview
| Comment: | Add munmap and mremap to the set of os interfaces that can be overloaded in os_unix.c. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | experimental-mmap |
| Files: | files | file ages | folders |
| SHA1: |
8776047bd776bbf266eb9c3b56683bad |
| User & Date: | drh 2013-03-25 20:50:25 |
Context
|
2013-03-25
| ||
| 23:09 | Memory-mapped I/O is now on by default. The "PRAGMA mmap_limit(N)" can be used to issue a hint to the VFS to limit mmap space to N bytes. The VFS is free to ignore that hint if desired. However, if "PRAGMA mmap_limit(0)" is used, xFetch is never called. (check-in: 1b37c4ef user: drh tags: experimental-mmap) | |
| 20:50 | Add munmap and mremap to the set of os interfaces that can be overloaded in os_unix.c. (check-in: 8776047b user: drh tags: experimental-mmap) | |
| 20:30 | Use mremap() on Linux. (check-in: 431aecc8 user: dan tags: experimental-mmap) | |
Changes
Changes to src/os_unix.c.
443 444 445 446 447 448 449 450 451 452 453 454 455 456 .... 4001 4002 4003 4004 4005 4006 4007 4008 4009 4010 4011 4012 4013 4014 4015 .... 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 .... 4497 4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 .... 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 .... 7192 7193 7194 7195 7196 7197 7198 7199 7200 7201 7202 7203 7204 7205 7206 |
{ "fchown", (sqlite3_syscall_ptr)posixFchown, 0 },
#define osFchown ((int(*)(int,uid_t,gid_t))aSyscall[20].pCurrent)
{ "mmap", (sqlite3_syscall_ptr)mmap, 0 },
#define osMmap ((void*(*)(void*,size_t,int,int,int,off_t))aSyscall[21].pCurrent)
}; /* End of the overrideable system calls */
/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "unix" VFSes. Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
................................................................................
assert( unixMutexHeld() );
if( p && p->nRef==0 ){
int i;
assert( p->pInode==pFd->pInode );
sqlite3_mutex_free(p->mutex);
for(i=0; i<p->nRegion; i++){
if( p->h>=0 ){
munmap(p->apRegion[i], p->szRegion);
}else{
sqlite3_free(p->apRegion[i]);
}
}
sqlite3_free(p->apRegion);
if( p->h>=0 ){
robust_close(pFd, p->h, __LINE__);
................................................................................
rc = SQLITE_IOERR_NOMEM;
goto shmpage_out;
}
pShmNode->apRegion = apNew;
while(pShmNode->nRegion<=iRegion){
void *pMem;
if( pShmNode->h>=0 ){
pMem = mmap(0, szRegion,
pShmNode->isReadonly ? PROT_READ : PROT_READ|PROT_WRITE,
MAP_SHARED, pShmNode->h, szRegion*(i64)pShmNode->nRegion
);
if( pMem==MAP_FAILED ){
rc = unixLogError(SQLITE_IOERR_SHMMAP, "mmap", pShmNode->zFilename);
goto shmpage_out;
}
................................................................................
/*
** If it is currently memory mapped, unmap file pFd.
*/
static void unixUnmapfile(unixFile *pFd){
assert( pFd->nFetchOut==0 );
if( pFd->pMapRegion ){
munmap(pFd->pMapRegion, pFd->mmapOrigsize);
pFd->pMapRegion = 0;
pFd->mmapSize = 0;
pFd->mmapOrigsize = 0;
}
}
/*
................................................................................
}
if( nMap!=pFd->mmapSize ){
void *pNew = 0;
#if defined(__linux__) && defined(_GNU_SOURCE)
if( pFd->pMapRegion && nMap>0 ){
pNew = mremap(pFd->pMapRegion, pFd->mmapOrigsize, nMap, MREMAP_MAYMOVE);
}else
#endif
{
unixUnmapfile(pFd);
if( nMap>0 ){
int flags = PROT_READ;
if( (pFd->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
................................................................................
UNIXVFS("unix-proxy", proxyIoFinder ),
#endif
};
unsigned int i; /* Loop counter */
/* Double-check that the aSyscall[] array has been constructed
** correctly. See ticket [bb3a86e890c8e96ab] */
assert( ArraySize(aSyscall)==22 );
/* Register all VFSes defined in the aVfs[] array */
for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
sqlite3_vfs_register(&aVfs[i], i==0);
}
return SQLITE_OK;
}
|
> > > > > > > > > > | | | | | |
443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 .... 4011 4012 4013 4014 4015 4016 4017 4018 4019 4020 4021 4022 4023 4024 4025 .... 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 .... 4507 4508 4509 4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521 .... 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 .... 7202 7203 7204 7205 7206 7207 7208 7209 7210 7211 7212 7213 7214 7215 7216 |
{ "fchown", (sqlite3_syscall_ptr)posixFchown, 0 },
#define osFchown ((int(*)(int,uid_t,gid_t))aSyscall[20].pCurrent)
{ "mmap", (sqlite3_syscall_ptr)mmap, 0 },
#define osMmap ((void*(*)(void*,size_t,int,int,int,off_t))aSyscall[21].pCurrent)
{ "munmap", (sqlite3_syscall_ptr)munmap, 0 },
#define osMunmap ((void*(*)(void*,size_t))aSyscall[22].pCurrent)
#if defined(__linux__) && defined(_GNU_SOURCE)
{ "mremap", (sqlite3_syscall_ptr)mremap, 0 },
#else
{ "mremap", (sqlite3_syscall_ptr)0, 0 },
#endif
#define osMremap ((void*(*)(void*,size_t,size_t,int,...))aSyscall[23].pCurrent)
}; /* End of the overrideable system calls */
/*
** This is the xSetSystemCall() method of sqlite3_vfs for all of the
** "unix" VFSes. Return SQLITE_OK opon successfully updating the
** system call pointer, or SQLITE_NOTFOUND if there is no configurable
** system call named zName.
................................................................................
assert( unixMutexHeld() );
if( p && p->nRef==0 ){
int i;
assert( p->pInode==pFd->pInode );
sqlite3_mutex_free(p->mutex);
for(i=0; i<p->nRegion; i++){
if( p->h>=0 ){
osMunmap(p->apRegion[i], p->szRegion);
}else{
sqlite3_free(p->apRegion[i]);
}
}
sqlite3_free(p->apRegion);
if( p->h>=0 ){
robust_close(pFd, p->h, __LINE__);
................................................................................
rc = SQLITE_IOERR_NOMEM;
goto shmpage_out;
}
pShmNode->apRegion = apNew;
while(pShmNode->nRegion<=iRegion){
void *pMem;
if( pShmNode->h>=0 ){
pMem = osMmap(0, szRegion,
pShmNode->isReadonly ? PROT_READ : PROT_READ|PROT_WRITE,
MAP_SHARED, pShmNode->h, szRegion*(i64)pShmNode->nRegion
);
if( pMem==MAP_FAILED ){
rc = unixLogError(SQLITE_IOERR_SHMMAP, "mmap", pShmNode->zFilename);
goto shmpage_out;
}
................................................................................
/*
** If it is currently memory mapped, unmap file pFd.
*/
static void unixUnmapfile(unixFile *pFd){
assert( pFd->nFetchOut==0 );
if( pFd->pMapRegion ){
osMunmap(pFd->pMapRegion, pFd->mmapOrigsize);
pFd->pMapRegion = 0;
pFd->mmapSize = 0;
pFd->mmapOrigsize = 0;
}
}
/*
................................................................................
}
if( nMap!=pFd->mmapSize ){
void *pNew = 0;
#if defined(__linux__) && defined(_GNU_SOURCE)
if( pFd->pMapRegion && nMap>0 ){
pNew = osMremap(pFd->pMapRegion, pFd->mmapOrigsize, nMap, MREMAP_MAYMOVE);
}else
#endif
{
unixUnmapfile(pFd);
if( nMap>0 ){
int flags = PROT_READ;
if( (pFd->ctrlFlags & UNIXFILE_RDONLY)==0 ) flags |= PROT_WRITE;
................................................................................
UNIXVFS("unix-proxy", proxyIoFinder ),
#endif
};
unsigned int i; /* Loop counter */
/* Double-check that the aSyscall[] array has been constructed
** correctly. See ticket [bb3a86e890c8e96ab] */
assert( ArraySize(aSyscall)==24 );
/* Register all VFSes defined in the aVfs[] array */
for(i=0; i<(sizeof(aVfs)/sizeof(sqlite3_vfs)); i++){
sqlite3_vfs_register(&aVfs[i], i==0);
}
return SQLITE_OK;
}
|
Changes to test/syscall.test.
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 |
#-------------------------------------------------------------------------
# Tests for the xNextSystemCall method.
#
foreach s {
open close access getcwd stat fstat ftruncate
fcntl read pread write pwrite fchmod fallocate
pread64 pwrite64 unlink openDirectory mkdir rmdir
statvfs fchown umask mmap
} {
if {[test_syscall exists $s]} {lappend syscall_list $s}
}
do_test 3.1 { lsort [test_syscall list] } [lsort $syscall_list]
#-------------------------------------------------------------------------
# This test verifies that if a call to open() fails and errno is set to
|
| |
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 |
#-------------------------------------------------------------------------
# Tests for the xNextSystemCall method.
#
foreach s {
open close access getcwd stat fstat ftruncate
fcntl read pread write pwrite fchmod fallocate
pread64 pwrite64 unlink openDirectory mkdir rmdir
statvfs fchown umask mmap munmap mremap
} {
if {[test_syscall exists $s]} {lappend syscall_list $s}
}
do_test 3.1 { lsort [test_syscall list] } [lsort $syscall_list]
#-------------------------------------------------------------------------
# This test verifies that if a call to open() fails and errno is set to
|