NextGraph
/
lmdb
mirror of https://github.com/nextgraph-org/lmdb.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

Ugly-as-sin initial Windows port

Browse Source
vmware master.old
Howard Chu 13 years ago
parent 2510bea718
commit 30736a0ff5
1 changed files with 361 additions and 70 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Show Stats Download Patch File Download Diff File
  1. 397
      libraries/libmdb/mdb.c

397
libraries/libmdb/mdb.c
Unescape View File

@ -35,12 +35,16 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/uio.h>
#include <sys/mman.h>
#ifdef HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#include <fcntl.h>
#endif
#include <assert.h>
#include <errno.h>
@ -51,8 +55,42 @@
#include <string.h>
#include <time.h>
#include <unistd.h>
#ifdef _WIN32
#define pthread_t DWORD
#define pthread_mutex_t HANDLE
#define pthread_key_t DWORD
#define pthread_self() GetCurrentThreadId()
#define pthread_key_create(x,y) *(x) = TlsAlloc()
#define pthread_key_delete(x) TlsFree(x)
#define pthread_getspecific(x) TlsGetValue(x)
#define pthread_setspecific(x,y) TlsSetValue(x,y)
#define pthread_mutex_unlock(x) ReleaseMutex(x)
#define pthread_mutex_lock(x) WaitForSingleObject(x, INFINITE)
#define LOCK_MUTEX_R(env) pthread_mutex_lock(env->me_rmutex)
#define UNLOCK_MUTEX_R(env) pthread_mutex_unlock(env->me_rmutex)
#define LOCK_MUTEX_W(env) pthread_mutex_lock(env->me_wmutex)
#define UNLOCK_MUTEX_W(env) pthread_mutex_unlock(env->me_wmutex)
#define getpid() GetCurrentProcessId()
#else
#include <pthread.h>
#define LOCK_MUTEX_R(env) pthread_mutex_lock(&env->me_txns->mti_mutex)
#define UNLOCK_MUTEX_R(env) pthread_mutex_unlock(&env->me_txns->mti_mutex)
#define LOCK_MUTEX_W(env) pthread_mutex_lock(&env->me_txns->mti_wmutex)
#define UNLOCK_MUTEX_W(env) pthread_mutex_unlock(&env->me_txns->mti_wmutex)
#endif
#ifdef _WIN32
#define fdatasync(fd) !FlushFileBuffers(fd)
#define ErrCode() GetLastError()
#define GetPageSize(x) {SYSTEM_INFO si; GetSystemInfo(&si); (x) = si.dwPageSize;}
#define close(fd) CloseHandle(fd)
#define munmap(ptr,len) UnmapViewOfFile(ptr)
#else
#define ErrCode() errno
#define HANDLE int
#define INVALID_HANDLE_VALUE -1
#define GetPageSize(x) (x) = sysconf(_SC_PAGE_SIZE)
#endif
#include "mdb.h"
#define ULONG unsigned long
@ -156,7 +194,16 @@ typedef struct MDB_reader {
typedef struct MDB_txbody {
uint32_t mtb_magic;
uint32_t mtb_version;
/* For POSIX the actual mutexes reside in shared memory.
* On Windows, mutexes are allocated by the kernel; we store
* the name in shared memory so that other processes can
* grab them.
*/
#ifdef _WIN32
char mtb_rmname[32];
#else
pthread_mutex_t mtb_mutex;
#endif
ULONG mtb_txnid;
uint32_t mtb_numreaders;
uint32_t mtb_me_toggle;
@ -168,14 +215,20 @@ typedef struct MDB_txninfo {
#define mti_magic mt1.mtb.mtb_magic
#define mti_version mt1.mtb.mtb_version
#define mti_mutex mt1.mtb.mtb_mutex
#define mti_rmname mt1.mtb.mtb_rmname
#define mti_txnid mt1.mtb.mtb_txnid
#define mti_numreaders mt1.mtb.mtb_numreaders
#define mti_me_toggle mt1.mtb.mtb_me_toggle
char pad[(sizeof(MDB_txbody)+CACHELINE-1) & ~(CACHELINE-1)];
} mt1;
union {
#ifdef _WIN32
char mt2_wmname[32];
#define mti_wmname mt2.mt2_wmname
#else
pthread_mutex_t mt2_wmutex;
#define mti_wmutex mt2.mt2_wmutex
#endif
char pad[(sizeof(pthread_mutex_t)+CACHELINE-1) & ~(CACHELINE-1)];
} mt2;
MDB_reader mti_readers[1];
@ -351,9 +404,9 @@ typedef struct MDB_xcursor {
} MDB_xcursor;
struct MDB_env {
int me_fd;
int me_lfd;
int me_mfd; /* just for writing the meta pages */
HANDLE me_fd;
HANDLE me_lfd;
HANDLE me_mfd; /* just for writing the meta pages */
#define MDB_FATAL_ERROR 0x80000000U
uint32_t me_flags;
uint32_t me_extrapad; /* unused for now */
@ -378,6 +431,10 @@ struct MDB_env {
pgno_t me_free_pgs[MDB_IDL_UM_SIZE];
MIDL2 me_dirty_list[MDB_IDL_DB_SIZE];
LAZY_RWLOCK_DEF(me_dblock);
#ifdef _WIN32
HANDLE me_rmutex; /* Windows mutexes don't reside in shared mem */
HANDLE me_wmutex;
#endif
};
#define NODESIZE offsetof(MDB_node, mn_data)
@ -464,6 +521,12 @@ static int memncmp(const void *s1, size_t n1,
static int memnrcmp(const void *s1, size_t n1,
const void *s2, size_t n2);
#ifdef _WIN32
static SECURITY_DESCRIPTOR mdb_null_sd;
static SECURITY_ATTRIBUTES mdb_all_sa;
static int mdb_sec_inited;
#endif
static int
memncmp(const void *s1, size_t n1, const void *s2, size_t n2)
{
@ -506,7 +569,7 @@ mdb_version(int *maj, int *min, int *pat)
return MDB_VERSION_STRING;
}
static char *const errstr[] = {
static char *const mdb_errstr[] = {
"MDB_KEYEXIST: Key/data pair already exists",
"MDB_NOTFOUND: No matching key/data pair found",
"MDB_PAGE_NOTFOUND: Requested page not found",
@ -522,7 +585,7 @@ mdb_strerror(int err)
return ("Successful return: 0");
if (err >= MDB_KEYEXIST && err <= MDB_VERSION_MISMATCH)
return errstr[err - MDB_KEYEXIST];
return mdb_errstr[err - MDB_KEYEXIST];
return strerror(err);
}
@ -731,7 +794,7 @@ mdb_env_sync(MDB_env *env, int force)
int rc = 0;
if (force || !F_ISSET(env->me_flags, MDB_NOSYNC)) {
if (fdatasync(env->me_fd))
rc = errno;
rc = ErrCode();
}
return rc;
}
@ -751,19 +814,19 @@ mdb_txn_renew0(MDB_txn *txn)
pid_t pid = getpid();
pthread_t tid = pthread_self();
pthread_mutex_lock(&env->me_txns->mti_mutex);
LOCK_MUTEX_R(env);
for (i=0; i<env->me_txns->mti_numreaders; i++)
if (env->me_txns->mti_readers[i].mr_pid == 0)
break;
if (i == env->me_maxreaders) {
pthread_mutex_unlock(&env->me_txns->mti_mutex);
UNLOCK_MUTEX_R(env);
return ENOMEM;
}
env->me_txns->mti_readers[i].mr_pid = pid;
env->me_txns->mti_readers[i].mr_tid = tid;
if (i >= env->me_txns->mti_numreaders)
env->me_txns->mti_numreaders = i+1;
pthread_mutex_unlock(&env->me_txns->mti_mutex);
UNLOCK_MUTEX_R(env);
r = &env->me_txns->mti_readers[i];
pthread_setspecific(env->me_txkey, r);
}
@ -772,7 +835,7 @@ mdb_txn_renew0(MDB_txn *txn)
r->mr_txnid = txn->mt_txnid;
txn->mt_u.reader = r;
} else {
pthread_mutex_lock(&env->me_txns->mti_wmutex);
LOCK_MUTEX_W(env);
txn->mt_txnid = env->me_txns->mti_txnid+1;
txn->mt_toggle = env->me_txns->mti_me_toggle;
@ -830,7 +893,7 @@ mdb_txn_begin(MDB_env *env, unsigned int flags, MDB_txn **ret)
return MDB_PANIC;
}
if ((txn = calloc(1, sizeof(MDB_txn) + env->me_maxdbs * sizeof(MDB_db))) == NULL) {
DPRINTF("calloc: %s", strerror(errno));
DPRINTF("calloc: %s", strerror(ErrCode()));
return ENOMEM;
}
txn->mt_dbs = (MDB_db *)(txn+1);
@ -884,7 +947,7 @@ mdb_txn_reset0(MDB_txn *txn)
env->me_txn = NULL;
for (i=2; i<env->me_numdbs; i++)
env->me_dbxs[i].md_dirty = 0;
pthread_mutex_unlock(&env->me_txns->mti_wmutex);
UNLOCK_MUTEX_W(env);
}
}
@ -925,7 +988,6 @@ mdb_txn_commit(MDB_txn *txn)
MDB_dpage *dp;
MDB_env *env;
pgno_t next;
struct iovec iov[MDB_COMMIT_PAGES];
assert(txn != NULL);
assert(txn->mt_env != NULL);
@ -1041,6 +1103,36 @@ mdb_txn_commit(MDB_txn *txn)
next = 0;
i = 1;
do {
#ifdef _WIN32
/* Windows actually supports scatter/gather I/O, but only on
* unbuffered file handles. Since we're relying on the OS page
* cache for all our data, that's self-defeating. So we just
* write pages one at a time. We use the ov structure to set
* the write offset, to at least save the overhead of a Seek
* system call.
*/
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
for (; i<=txn->mt_u.dirty_list[0].mid; i++) {
dp = txn->mt_u.dirty_list[i].mptr;
DPRINTF("committing page %lu", dp->p.mp_pgno);
size = dp->p.mp_pgno * env->me_psize;
ov.Offset = size & 0xffffffff;
ov.OffsetHigh = size >> 16;
ov.OffsetHigh >>= 16;
/* clear dirty flag */
dp->p.mp_flags &= ~P_DIRTY;
rc = WriteFile(env->me_fd, &dp->p, env->me_psize * dp->h.md_num, NULL, &ov);
if (!rc) {
n = ErrCode();
DPRINTF("WriteFile: %d", n);
mdb_txn_abort(txn);
return n;
}
}
done = 1;;
#else
struct iovec iov[MDB_COMMIT_PAGES];
n = 0;
done = 1;
size = 0;
@ -1051,11 +1143,11 @@ mdb_txn_commit(MDB_txn *txn)
DPRINTF("committing %u dirty pages", n);
rc = writev(env->me_fd, iov, n);
if (rc != size) {
n = errno;
n = ErrCode();
if (rc > 0)
DPUTS("short write, filesystem full?");
else
DPRINTF("writev: %s", strerror(errno));
DPRINTF("writev: %s", strerror(n));
mdb_txn_abort(txn);
return n;
}
@ -1085,15 +1177,15 @@ mdb_txn_commit(MDB_txn *txn)
DPRINTF("committing %u dirty pages", n);
rc = writev(env->me_fd, iov, n);
if (rc != size) {
n = errno;
n = ErrCode();
if (rc > 0)
DPUTS("short write, filesystem full?");
else
DPRINTF("writev: %s", strerror(errno));
DPRINTF("writev: %s", strerror(n));
mdb_txn_abort(txn);
return n;
}
#endif
} while (!done);
/* Drop the dirty pages.
@ -1141,7 +1233,7 @@ done:
LAZY_RWLOCK_UNLOCK(&env->me_dblock);
}
pthread_mutex_unlock(&env->me_txns->mti_wmutex);
UNLOCK_MUTEX_W(env);
free(txn);
return MDB_SUCCESS;
@ -1153,20 +1245,25 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
char page[PAGESIZE];
MDB_page *p;
MDB_meta *m;
int rc;
assert(env != NULL);
int rc, err;
/* We don't know the page size yet, so use a minimum value.
*/
if ((rc = pread(env->me_fd, page, PAGESIZE, 0)) == 0) {
#ifdef _WIN32
if (!ReadFile(env->me_fd, page, PAGESIZE, (DWORD *)&rc, NULL) || rc == 0)
#else
if ((rc = read(env->me_fd, page, PAGESIZE)) == 0)
#endif
{
return ENOENT;
} else if (rc != PAGESIZE) {
}
else if (rc != PAGESIZE) {
err = ErrCode();
if (rc > 0)
errno = EINVAL;
DPRINTF("read: %s", strerror(errno));
return errno;
err = EINVAL;
DPRINTF("read: %s", strerror(err));
return err;
}
p = (MDB_page *)page;
@ -1201,7 +1298,8 @@ mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
unsigned int psize;
DPUTS("writing new meta page");
psize = sysconf(_SC_PAGE_SIZE);
GetPageSize(psize);
meta->mm_magic = MDB_MAGIC;
meta->mm_version = MDB_VERSION;
@ -1227,9 +1325,18 @@ mdb_env_init_meta(MDB_env *env, MDB_meta *meta)
m = METADATA(q);
memcpy(m, meta, sizeof(*meta));
#ifdef _WIN32
{
DWORD len;
rc = WriteFile(env->me_fd, p, psize * 2, &len, NULL);
rc = (len == psize * 2) ? MDB_SUCCESS : ErrCode();
}
#else
rc = write(env->me_fd, p, psize * 2);
rc = (rc == (int)psize * 2) ? MDB_SUCCESS : ErrCode();
#endif
free(p);
return (rc == (int)psize * 2) ? MDB_SUCCESS : errno;
return rc;
}
static int
@ -1240,6 +1347,9 @@ mdb_env_write_meta(MDB_txn *txn)
off_t off;
int rc, len, toggle;
char *ptr;
#ifdef _WIN32
OVERLAPPED ov;
#endif
assert(txn != NULL);
assert(txn->mt_env != NULL);
@ -1268,10 +1378,18 @@ mdb_env_write_meta(MDB_txn *txn)
off += PAGEHDRSZ;
/* Write to the SYNC fd */
#ifdef _WIN32
{
memset(&ov, 0, sizeof(ov));
ov.Offset = off;
WriteFile(env->me_mfd, ptr, len, (DWORD *)&rc, &ov);
}
#else
rc = pwrite(env->me_mfd, ptr, len, off);
#endif
if (rc != len) {
int r2;
rc = errno;
rc = ErrCode();
DPUTS("write failed, disk error?");
/* On a failure, the pagecache still contains the new data.
* Write some old data back, to prevent it from being used.
@ -1279,7 +1397,11 @@ mdb_env_write_meta(MDB_txn *txn)
*/
meta.mm_last_pg = metab.mm_last_pg;
meta.mm_txnid = metab.mm_txnid;
#ifdef _WIN32
WriteFile(env->me_fd, ptr, len, NULL, &ov);
#else
r2 = pwrite(env->me_fd, ptr, len, off);
#endif
env->me_flags |= MDB_FATAL_ERROR;
return rc;
}
@ -1323,9 +1445,9 @@ mdb_env_create(MDB_env **env)
e->me_maxreaders = DEFAULT_READERS;
e->me_maxdbs = 2;
e->me_fd = -1;
e->me_lfd = -1;
e->me_mfd = -1;
e->me_fd = INVALID_HANDLE_VALUE;
e->me_lfd = INVALID_HANDLE_VALUE;
e->me_mfd = INVALID_HANDLE_VALUE;
*env = e;
return MDB_SUCCESS;
}
@ -1388,13 +1510,41 @@ mdb_env_open2(MDB_env *env, unsigned int flags)
env->me_mapsize = newenv ? DEFAULT_MAPSIZE : meta.mm_mapsize;
}
#ifdef _WIN32
{
HANDLE mh;
LONG sizelo, sizehi;
sizelo = env->me_mapsize & 0xffffffff;
sizehi = env->me_mapsize >> 16; /* pointless on WIN32, only needed on W64 */
sizehi >>= 16;
/* Windows won't create mappings for zero length files.
* Just allocate the maxsize right now.
*/
if (newenv) {
SetFilePointer(env->me_fd, sizelo, sizehi ? &sizehi : NULL, 0);
if (!SetEndOfFile(env->me_fd))
return ErrCode();
SetFilePointer(env->me_fd, 0, NULL, 0);
}
mh = CreateFileMapping(env->me_fd, NULL, PAGE_READONLY,
sizehi, sizelo, NULL);
if (!mh)
return ErrCode();
env->me_map = MapViewOfFileEx(mh, FILE_MAP_READ, 0, 0, env->me_mapsize,
meta.mm_address);
CloseHandle(mh);
if (!env->me_map)
return ErrCode();
}
#else
i = MAP_SHARED;
if (meta.mm_address && (flags & MDB_FIXEDMAP))
i |= MAP_FIXED;
env->me_map = mmap(meta.mm_address, env->me_mapsize, PROT_READ, i,
env->me_fd, 0);
if (env->me_map == MAP_FAILED)
return errno;
return ErrCode();
#endif
if (newenv) {
meta.mm_mapsize = env->me_mapsize;
@ -1429,6 +1579,8 @@ mdb_env_open2(MDB_env *env, unsigned int flags)
return MDB_SUCCESS;
}
#ifndef _WIN32
/* Windows doesn't support destructor callbacks for thread-specific storage */
static void
mdb_env_reader_dest(void *ptr)
{
@ -1438,12 +1590,12 @@ mdb_env_reader_dest(void *ptr)
reader->mr_pid = 0;
reader->mr_tid = 0;
}
#endif
/* downgrade the exclusive lock on the region back to shared */
static void
mdb_env_share_locks(MDB_env *env)
{
struct flock lock_info;
int toggle = 0;
if (env->me_metas[0]->mm_txnid < env->me_metas[1]->mm_txnid)
@ -1451,6 +1603,20 @@ mdb_env_share_locks(MDB_env *env)
env->me_txns->mti_me_toggle = toggle;
env->me_txns->mti_txnid = env->me_metas[toggle]->mm_txnid;
#ifdef _WIN32
{
OVERLAPPED ov;
/* First acquire a shared lock. The Unlock will
* then release the existing exclusive lock.
*/
memset(&ov, 0, sizeof(ov));
LockFileEx(env->me_lfd, 0, 0, 1, 0, &ov);
UnlockFile(env->me_lfd, 0, 0, 1, 0);
}
#else
{
struct flock lock_info;
/* The shared lock replaces the existing lock */
memset((void *)&lock_info, 0, sizeof(lock_info));
lock_info.l_type = F_RDLCK;
lock_info.l_whence = SEEK_SET;
@ -1458,23 +1624,50 @@ mdb_env_share_locks(MDB_env *env)
lock_info.l_len = 1;
fcntl(env->me_lfd, F_SETLK, &lock_info);
}
#endif
}
static int
mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
{
int rc;
off_t size, rsize;
struct flock lock_info;
*excl = 0;
#ifdef _WIN32
if ((env->me_lfd = CreateFile(lpath, GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL)) == INVALID_HANDLE_VALUE) {
rc = ErrCode();
return rc;
}
/* Try to get exclusive lock. If we succeed, then
* nobody is using the lock region and we should initialize it.
*/
{
if (LockFile(env->me_lfd, 0, 0, 1, 0)) {
*excl = 1;
} else {
OVERLAPPED ov;
memset(&ov, 0, sizeof(ov));
if (!LockFileEx(env->me_lfd, 0, 0, 1, 0, &ov)) {
rc = ErrCode();
goto fail;
}
}
}
size = GetFileSize(env->me_lfd, NULL);
#else
if ((env->me_lfd = open(lpath, O_RDWR|O_CREAT, mode)) == -1) {
rc = errno;
rc = ErrCode();
return rc;
}
/* Try to get exclusive lock. If we succeed, then
* nobody is using the lock region and we should initialize it.
*/
{
struct flock lock_info;
memset((void *)&lock_info, 0, sizeof(lock_info));
lock_info.l_type = F_WRLCK;
lock_info.l_whence = SEEK_SET;
@ -1485,31 +1678,92 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
*excl = 1;
} else {
lock_info.l_type = F_RDLCK;
rc = fcntl(env->me_lfd, F_SETLK, &lock_info);
rc = fcntl(env->me_lfd, F_SETLKW, &lock_info);
if (rc) {
rc = errno;
rc = ErrCode();
goto fail;
}
}
}
size = lseek(env->me_lfd, 0, SEEK_END);
#endif
rsize = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
if (size < rsize && *excl) {
#ifdef _WIN32
SetFilePointer(env->me_lfd, rsize, NULL, 0);
if (!SetEndOfFile(env->me_lfd)) {
rc = ErrCode();
goto fail;
}
#else
if (ftruncate(env->me_lfd, rsize) != 0) {
rc = errno;
rc = ErrCode();
goto fail;
}
#endif
} else {
rsize = size;
size = rsize - sizeof(MDB_txninfo);
env->me_maxreaders = size/sizeof(MDB_reader) + 1;
}
#ifdef _WIN32
{
HANDLE mh;
mh = CreateFileMapping(env->me_lfd, NULL, PAGE_READWRITE,
0, 0, NULL);
if (!mh) {
rc = ErrCode();
goto fail;
}
env->me_txns = MapViewOfFileEx(mh, FILE_MAP_WRITE, 0, 0, rsize, NULL);
CloseHandle(mh);
if (!env->me_txns) {
rc = ErrCode();
goto fail;
}
}
#else
env->me_txns = mmap(0, rsize, PROT_READ|PROT_WRITE, MAP_SHARED,
env->me_lfd, 0);
if (env->me_txns == MAP_FAILED) {
rc = errno;
rc = ErrCode();
goto fail;
}
#endif
if (*excl) {
#ifdef _WIN32
char *ptr;
if (!mdb_sec_inited) {
InitializeSecurityDescriptor(&mdb_null_sd,
SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl(&mdb_null_sd, TRUE, 0, FALSE);
mdb_all_sa.nLength = sizeof(SECURITY_ATTRIBUTES);
mdb_all_sa.bInheritHandle = FALSE;
mdb_all_sa.lpSecurityDescriptor = &mdb_null_sd;
mdb_sec_inited = 1;
}
/* FIXME: only using up to 20 characters of the env path here,
* probably not enough to assure uniqueness...
*/
sprintf(env->me_txns->mti_rmname, "Global\\MDBr%.20s", lpath);
ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBr");
while ((ptr = strchr(ptr, '\\')))
*ptr++ = '/';
env->me_rmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
if (!env->me_rmutex) {
rc = ErrCode();
goto fail;
}
sprintf(env->me_txns->mti_rmname, "Global\\MDBw%.20s", lpath);
ptr = env->me_txns->mti_rmname + sizeof("Global\\MDBw");
while ((ptr = strchr(ptr, '\\')))
*ptr++ = '/';
env->me_wmutex = CreateMutex(&mdb_all_sa, FALSE, env->me_txns->mti_rmname);
if (!env->me_wmutex) {
rc = ErrCode();
goto fail;
}
#else
pthread_mutexattr_t mattr;
pthread_mutexattr_init(&mattr);
@ -1519,6 +1773,7 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
}
pthread_mutex_init(&env->me_txns->mti_mutex, &mattr);
pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr);
#endif
env->me_txns->mti_version = MDB_VERSION;
env->me_txns->mti_magic = MDB_MAGIC;
env->me_txns->mti_txnid = 0;
@ -1537,16 +1792,28 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
rc = MDB_VERSION_MISMATCH;
goto fail;
}
if (errno != EACCES && errno != EAGAIN) {
rc = errno;
rc = ErrCode();
if (rc != EACCES && rc != EAGAIN) {
goto fail;
}
#ifdef _WIN32
env->me_rmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_rmname);
if (!env->me_rmutex) {
rc = ErrCode();
goto fail;
}
env->me_wmutex = OpenMutex(SYNCHRONIZE, FALSE, env->me_txns->mti_wmname);
if (!env->me_wmutex) {
rc = ErrCode();
goto fail;
}
#endif
}
return MDB_SUCCESS;
fail:
close(env->me_lfd);
env->me_lfd = -1;
env->me_lfd = INVALID_HANDLE_VALUE;
return rc;
}
@ -1571,25 +1838,50 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
if (rc)
goto leave;
#ifdef _WIN32
if (F_ISSET(flags, MDB_RDONLY)) {
oflags = GENERIC_READ;
len = OPEN_EXISTING;
} else {
oflags = GENERIC_READ|GENERIC_WRITE;
len = OPEN_ALWAYS;
}
mode = FILE_ATTRIBUTE_NORMAL;
if ((env->me_fd = CreateFile(dpath, oflags, FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, len, mode, NULL)) == INVALID_HANDLE_VALUE) {
rc = ErrCode();
goto leave;
}
#else
if (F_ISSET(flags, MDB_RDONLY))
oflags = O_RDONLY;
else
oflags = O_RDWR | O_CREAT;
if ((env->me_fd = open(dpath, oflags, mode)) == -1) {
rc = errno;
rc = ErrCode();
goto leave;
}
#endif
if ((rc = mdb_env_open2(env, flags)) == MDB_SUCCESS) {
/* synchronous fd for meta writes */
#ifdef _WIN32
if (!(flags & (MDB_RDONLY|MDB_NOSYNC)))
mode |= FILE_FLAG_WRITE_THROUGH;
if ((env->me_mfd = CreateFile(dpath, oflags, FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL, len, mode, NULL)) == INVALID_HANDLE_VALUE) {
rc = ErrCode();
goto leave;
}
#else
if (!(flags & (MDB_RDONLY|MDB_NOSYNC)))
oflags |= MDB_DSYNC;
if ((env->me_mfd = open(dpath, oflags, mode)) == -1) {
rc = errno;
rc = ErrCode();
goto leave;
}
#endif
env->me_path = strdup(path);
DPRINTF("opened dbenv %p", (void *) env);
pthread_key_create(&env->me_txkey, mdb_env_reader_dest);
@ -1604,13 +1896,13 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mode_t mode)
leave:
if (rc) {
if (env->me_fd >= 0) {
if (env->me_fd != INVALID_HANDLE_VALUE) {
close(env->me_fd);
env->me_fd = -1;
env->me_fd = INVALID_HANDLE_VALUE;
}
if (env->me_lfd >= 0) {
if (env->me_lfd != INVALID_HANDLE_VALUE) {
close(env->me_lfd);
env->me_lfd = -1;
env->me_lfd = INVALID_HANDLE_VALUE;
}
}
free(lpath);
@ -1646,12 +1938,11 @@ mdb_env_close(MDB_env *env)
close(env->me_fd);
if (env->me_txns) {
pid_t pid = getpid();
size_t size = (env->me_maxreaders-1) * sizeof(MDB_reader) + sizeof(MDB_txninfo);
unsigned int i;
for (i=0; i<env->me_txns->mti_numreaders; i++)
if (env->me_txns->mti_readers[i].mr_pid == pid)
env->me_txns->mti_readers[i].mr_pid = 0;
munmap(env->me_txns, size);
munmap(env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
}
close(env->me_lfd);
free(env);

Write Preview
Loading…
Cancel
Save