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lmdb: drops support for non-POSIX.

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This is 2/9 for https://github.com/ReOpen/ReOpenLDAP/issues/1
and https://github.com/ReOpen/ReOpenLDAP/issues/2

Change-Id: I7ab3d5416381c9477edba4ce9db2f3fdc58a2d3d
This commit is contained in:
Leo Yuriev
2015-05-21 15:51:43 +03:00
parent c5db4043ee
commit eec1ccaa77
1 changed files with 63 additions and 275 deletions
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338
mdb.c
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@@ -206,38 +206,17 @@ static MDB_INLINE void mdb_invalidate_cache(void *addr, int nbytes) {
#include <time.h> #include <time.h>
#include <unistd.h> #include <unistd.h>
#include <alloca.h> #include <alloca.h>
#include <pthread.h>
#if defined(__sun) || defined(ANDROID)
/* Most platforms have posix_memalign, older may only have memalign */
#define HAVE_MEMALIGN 1
# include <malloc.h>
#endif
#if !(defined(BYTE_ORDER) || defined(__BYTE_ORDER)) #if !(defined(BYTE_ORDER) || defined(__BYTE_ORDER))
# include <netinet/in.h> # include <netinet/in.h>
# include <resolv.h> /* defines BYTE_ORDER on HPUX and Solaris */ # include <resolv.h> /* defines BYTE_ORDER on HPUX and Solaris */
#endif #endif
#if defined(__APPLE__) || defined (BSD) #ifndef _POSIX_SYNCHRONIZED_IO
# define MDB_USE_SYSV_SEM 1 # define fdatasync fsync
# define MDB_FDATASYNC fsync
#elif defined(ANDROID)
# define MDB_FDATASYNC fsync
#endif #endif
#include <pthread.h>
#ifdef MDB_USE_SYSV_SEM
# include <sys/ipc.h>
# include <sys/sem.h>
# ifdef _SEM_SEMUN_UNDEFINED
union semun {
int val;
struct semid_ds *buf;
unsigned short *array;
};
# endif /* _SEM_SEMUN_UNDEFINED */
#endif /* MDB_USE_SYSV_SEM */
#ifndef BYTE_ORDER #ifndef BYTE_ORDER
# if (defined(_LITTLE_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN)) # if (defined(_LITTLE_ENDIAN) || defined(_BIG_ENDIAN)) && !(defined(_LITTLE_ENDIAN) && defined(_BIG_ENDIAN))
/* Solaris just defines one or the other */ /* Solaris just defines one or the other */
@@ -298,10 +277,6 @@ static MDB_INLINE void mdb_invalidate_cache(void *addr, int nbytes) {
/** Features under development */ /** Features under development */
#ifndef MDB_DEVEL #ifndef MDB_DEVEL
# define MDB_DEVEL 0 # define MDB_DEVEL 0
#endif
#if defined(MDB_USE_SYSV_SEM) || defined(EOWNERDEAD)
# define MDB_ROBUST_SUPPORTED 1
#endif #endif
/** Wrapper around __func__, which is a C99 feature */ /** Wrapper around __func__, which is a C99 feature */
@@ -316,103 +291,11 @@ static MDB_INLINE void mdb_invalidate_cache(void *addr, int nbytes) {
/* Internal error codes, not exposed outside liblmdb */ /* Internal error codes, not exposed outside liblmdb */
#define MDB_NO_ROOT (MDB_LAST_ERRCODE + 10) #define MDB_NO_ROOT (MDB_LAST_ERRCODE + 10)
#if defined MDB_USE_SYSV_SEM
# define MDB_OWNERDEAD (MDB_LAST_ERRCODE + 11)
#else
# define MDB_OWNERDEAD EOWNERDEAD
#endif
#ifdef MDB_USE_SYSV_SEM
typedef struct mdb_mutex {
int semid;
int semnum;
int *locked;
} mdb_mutex_t;
#define MDB_MUTEX(env, rw) (&(env)->me_##rw##mutex)
#define LOCK_MUTEX0(mutex) mdb_sem_wait(mutex)
#define UNLOCK_MUTEX(mutex) do { \
struct sembuf sb = { 0, 1, SEM_UNDO }; \
sb.sem_num = (mutex)->semnum; \
*(mutex)->locked = 0; \
semop((mutex)->semid, &sb, 1); \
} while(0)
static int
mdb_sem_wait(mdb_mutex_t *sem)
{
int rc, *locked = sem->locked;
struct sembuf sb = { 0, -1, SEM_UNDO };
sb.sem_num = sem->semnum;
do {
if (!semop(sem->semid, &sb, 1)) {
rc = *locked ? MDB_OWNERDEAD : MDB_SUCCESS;
*locked = 1;
break;
}
} while ((rc = errno) == EINTR);
return rc;
}
typedef struct mdb_mutex {
int semid;
int semnum;
int *locked;
} mdb_mutex_t;
# define MDB_MUTEX(env, rw) \
(&(env)->me_##rw##mutex)
# define LOCK_MUTEX0(mutex) \
mdb_sem_wait(mutex)
# define UNLOCK_MUTEX(mutex) do { \
struct sembuf sb = { 0, 1, SEM_UNDO }; \
sb.sem_num = (mutex)->semnum; \
*(mutex)->locked = 0; \
semop((mutex)->semid, &sb, 1); \
} while(0)
static int
mdb_sem_wait(mdb_mutex_t *sem)
{
int rc, *locked = sem->locked;
struct sembuf sb = { 0, -1, SEM_UNDO };
sb.sem_num = sem->semnum;
do {
if (!semop(sem->semid, &sb, 1)) {
rc = *locked ? MDB_OWNERDEAD : MDB_SUCCESS;
*locked = 1;
break;
}
} while ((rc = errno) == EINTR);
return rc;
}
# define mdb_mutex_consistent(mutex) 0
#else /* MDB_USE_SYSV_SEM */
/** Pointer/HANDLE type of shared mutex/semaphore.
*/
typedef pthread_mutex_t mdb_mutex_t;
/** Mutex for the reader table (rw = r) or write transaction (rw = w). /** Mutex for the reader table (rw = r) or write transaction (rw = w).
*/ */
# define MDB_MUTEX(env, rw) \ #define MDB_MUTEX(env, rw) \
(&(env)->me_txns->mti_##rw##mutex) (&(env)->me_txns->mti_##rw##mutex)
/** Lock the reader or writer mutex.
* Returns 0 or a code to give #mdb_mutex_failed(), as in #LOCK_MUTEX().
*/
# define LOCK_MUTEX0(mutex) \
pthread_mutex_lock(mutex)
/** Unlock the reader or writer mutex.
*/
# define UNLOCK_MUTEX(mutex) \
pthread_mutex_unlock(mutex)
/** Mark mutex-protected data as repaired, after death of previous owner.
*/
# define mdb_mutex_consistent(mutex) \
pthread_mutex_consistent(mutex)
#endif /* MDB_USE_SYSV_SEM */
/** An abstraction for a file handle. /** An abstraction for a file handle.
* On POSIX systems file handles are small integers. On Windows * On POSIX systems file handles are small integers. On Windows
@@ -432,32 +315,11 @@ mdb_sem_wait(mdb_mutex_t *sem)
*/ */
#define GET_PAGESIZE(x) ((x) = sysconf(_SC_PAGE_SIZE)) #define GET_PAGESIZE(x) ((x) = sysconf(_SC_PAGE_SIZE))
#ifdef MDB_USE_SYSV_SEM
# define MNAME_LEN (sizeof(int))
#else
# define MNAME_LEN (sizeof(pthread_mutex_t))
#endif
#ifdef MDB_USE_SYSV_SEM
# define SYSV_SEM_FLAG 1 /**< SysV sems in lockfile format */
#else
# define SYSV_SEM_FLAG 0
#endif
/** @} */ /** @} */
#ifdef MDB_ROBUST_SUPPORTED static int mdb_mutex_lock(MDB_env *env, pthread_mutex_t *mutex);
/** Lock mutex, handle any error, set rc = result. static int mdb_mutex_failed(MDB_env *env, pthread_mutex_t *mutex, int rc);
* Return 0 on success, nonzero (not rc) on error. static void mdb_mutex_unlock(MDB_env *env, pthread_mutex_t *mutex);
*/
# define LOCK_MUTEX(rc, env, mutex) \
(((rc) = LOCK_MUTEX0(mutex)) && \
((rc) = mdb_mutex_failed(env, mutex, rc)))
static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc);
#else
# define LOCK_MUTEX(rc, env, mutex) ((rc) = LOCK_MUTEX0(mutex))
# define mdb_mutex_failed(env, mutex, rc) (rc)
#endif /* MDB_ROBUST_SUPPORTED */
/** A flag for opening a file and requesting synchronous data writes. /** A flag for opening a file and requesting synchronous data writes.
* This is only used when writing a meta page. It's not strictly needed; * This is only used when writing a meta page. It's not strictly needed;
@@ -723,15 +585,10 @@ typedef struct MDB_txbody {
uint32_t mtb_magic; uint32_t mtb_magic;
/** Format of this lock file. Must be set to #MDB_LOCK_FORMAT. */ /** Format of this lock file. Must be set to #MDB_LOCK_FORMAT. */
uint32_t mtb_format; uint32_t mtb_format;
#ifdef MDB_USE_SYSV_SEM
int mtb_semid;
int mtb_rlocked;
#else
/** Mutex protecting access to this table. /** Mutex protecting access to this table.
* This is the #MDB_MUTEX(env,r) reader table lock. * This is the #MDB_MUTEX(env,r) reader table lock.
*/ */
pthread_mutex_t mtb_rmutex; pthread_mutex_t mtb_rmutex;
#endif
/** The ID of the last transaction committed to the database. /** The ID of the last transaction committed to the database.
* This is recorded here only for convenience; the value can always * This is recorded here only for convenience; the value can always
* be determined by reading the main database meta pages. * be determined by reading the main database meta pages.
@@ -754,21 +611,12 @@ typedef struct MDB_txninfo {
#define mti_rmname mt1.mtb.mtb_rmname #define mti_rmname mt1.mtb.mtb_rmname
#define mti_txnid mt1.mtb.mtb_txnid #define mti_txnid mt1.mtb.mtb_txnid
#define mti_numreaders mt1.mtb.mtb_numreaders #define mti_numreaders mt1.mtb.mtb_numreaders
#ifdef MDB_USE_SYSV_SEM
# define mti_semid mt1.mtb.mtb_semid
# define mti_rlocked mt1.mtb.mtb_rlocked
#endif
char pad[(sizeof(MDB_txbody)+CACHELINE_SIZE-1) & ~(CACHELINE_SIZE-1)]; char pad[(sizeof(MDB_txbody)+CACHELINE_SIZE-1) & ~(CACHELINE_SIZE-1)];
} mt1; } mt1;
union { union {
#ifdef MDB_USE_SYSV_SEM
int mt2_wlocked;
# define mti_wlocked mt2.mt2_wlocked
#else
pthread_mutex_t mt2_wmutex; pthread_mutex_t mt2_wmutex;
# define mti_wmutex mt2.mt2_wmutex # define mti_wmutex mt2.mt2_wmutex
#endif char pad[(sizeof(pthread_mutex_t)+CACHELINE_SIZE-1) & ~(CACHELINE_SIZE-1)];
char pad[(MNAME_LEN+CACHELINE_SIZE-1) & ~(CACHELINE_SIZE-1)];
} mt2; } mt2;
MDB_reader mti_readers[1]; MDB_reader mti_readers[1];
} MDB_txninfo; } MDB_txninfo;
@@ -778,7 +626,7 @@ typedef struct MDB_txninfo {
((uint32_t) \ ((uint32_t) \
((MDB_LOCK_VERSION) \ ((MDB_LOCK_VERSION) \
/* Flags which describe functionality */ \ /* Flags which describe functionality */ \
+ (SYSV_SEM_FLAG << 18) \ + (0 /* SYSV_SEM_FLAG */ << 18) \
+ (1 /* MDB_PIDLOCK */ << 16))) + (1 /* MDB_PIDLOCK */ << 16)))
/** @} */ /** @} */
@@ -1256,11 +1104,6 @@ struct MDB_env {
unsigned me_maxkey; /**< max size of a key */ unsigned me_maxkey; /**< max size of a key */
#endif #endif
int me_live_reader; /**< have liveness lock in reader table */ int me_live_reader; /**< have liveness lock in reader table */
#ifdef MDB_USE_SYSV_SEM
/* Windows mutexes/SysV semaphores do not reside in shared mem */
mdb_mutex_t me_rmutex;
mdb_mutex_t me_wmutex;
#endif
void *me_userctx; /**< User-settable context */ void *me_userctx; /**< User-settable context */
#if MDB_DEBUG #if MDB_DEBUG
MDB_assert_func *me_assert_func; /**< Callback for assertion failures */ MDB_assert_func *me_assert_func; /**< Callback for assertion failures */
@@ -1322,10 +1165,7 @@ static int mdb_page_split(MDB_cursor *mc, MDB_val *newkey, MDB_val *newdata,
static int mdb_env_read_header(MDB_env *env, MDB_meta *meta); static int mdb_env_read_header(MDB_env *env, MDB_meta *meta);
static int mdb_env_pick_meta(const MDB_env *env); static int mdb_env_pick_meta(const MDB_env *env);
static int mdb_env_write_meta(MDB_txn *txn, int force); static int mdb_env_write_meta(MDB_txn *txn, int force);
#ifndef MDB_USE_SYSV_SEM /* Drop unused excl arg */ static void mdb_env_close0(MDB_env *env);
# define mdb_env_close0(env, excl) mdb_env_close1(env)
#endif
static void mdb_env_close0(MDB_env *env, int excl);
static MDB_node *mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp); static MDB_node *mdb_node_search(MDB_cursor *mc, MDB_val *key, int *exactp);
static int mdb_node_add(MDB_cursor *mc, indx_t indx, static int mdb_node_add(MDB_cursor *mc, indx_t indx,
@@ -2706,7 +2546,7 @@ mdb_env_sync(MDB_env *env, int force)
MDB_meta *meta; MDB_meta *meta;
txnid_t checkpoint; txnid_t checkpoint;
int rc, lockfree_countdown = 3; int rc, lockfree_countdown = 3;
mdb_mutex_t *mutex = NULL; pthread_mutex_t *mutex = NULL;
if (env->me_flags & MDB_RDONLY) if (env->me_flags & MDB_RDONLY)
return 0; return 0;
@@ -2714,7 +2554,8 @@ mdb_env_sync(MDB_env *env, int force)
do { do {
if (!mutex && --lockfree_countdown == 0) { if (!mutex && --lockfree_countdown == 0) {
mutex = MDB_MUTEX(env, w); mutex = MDB_MUTEX(env, w);
if (LOCK_MUTEX(rc, env, mutex)) rc = mdb_mutex_lock(env, mutex);
if (unlikely(rc))
return rc; return rc;
} }
@@ -2733,7 +2574,7 @@ mdb_env_sync(MDB_env *env, int force)
} while (rc == 0 && checkpoint != meta->mm_txnid); } while (rc == 0 && checkpoint != meta->mm_txnid);
if (mutex) if (mutex)
UNLOCK_MUTEX(mutex); mdb_mutex_unlock(env, mutex);
return rc; return rc;
} }
@@ -2877,7 +2718,7 @@ mdb_txn_renew0(MDB_txn *txn)
} else { } else {
pid_t pid = env->me_pid; pid_t pid = env->me_pid;
pthread_t tid = pthread_self(); pthread_t tid = pthread_self();
mdb_mutex_t *rmutex = MDB_MUTEX(env, r); pthread_mutex_t *rmutex = MDB_MUTEX(env, r);
if (!env->me_live_reader) { if (!env->me_live_reader) {
rc = mdb_reader_pid(env, F_SETLK, pid); rc = mdb_reader_pid(env, F_SETLK, pid);
@@ -2886,14 +2727,15 @@ mdb_txn_renew0(MDB_txn *txn)
env->me_live_reader = 1; env->me_live_reader = 1;
} }
if (LOCK_MUTEX(rc, env, rmutex)) rc = mdb_mutex_lock(env, rmutex);
if (unlikely(rc))
return rc; return rc;
nr = ti->mti_numreaders; nr = ti->mti_numreaders;
for (i=0; i<nr; i++) for (i=0; i<nr; i++)
if (ti->mti_readers[i].mr_pid == 0) if (ti->mti_readers[i].mr_pid == 0)
break; break;
if (i == env->me_maxreaders) { if (i == env->me_maxreaders) {
UNLOCK_MUTEX(rmutex); mdb_mutex_unlock(env, rmutex);
return MDB_READERS_FULL; return MDB_READERS_FULL;
} }
r = &ti->mti_readers[i]; r = &ti->mti_readers[i];
@@ -2911,7 +2753,7 @@ mdb_txn_renew0(MDB_txn *txn)
ti->mti_numreaders = ++nr; ti->mti_numreaders = ++nr;
env->me_close_readers = nr; env->me_close_readers = nr;
r->mr_pid = pid; r->mr_pid = pid;
UNLOCK_MUTEX(rmutex); mdb_mutex_unlock(env, rmutex);
new_notls = (env->me_flags & MDB_NOTLS); new_notls = (env->me_flags & MDB_NOTLS);
if (!new_notls && (rc=pthread_setspecific(env->me_txkey, r))) { if (!new_notls && (rc=pthread_setspecific(env->me_txkey, r))) {
@@ -2932,7 +2774,8 @@ mdb_txn_renew0(MDB_txn *txn)
} else { } else {
/* Not yet touching txn == env->me_txn0, it may be active */ /* Not yet touching txn == env->me_txn0, it may be active */
if (ti) { if (ti) {
if (LOCK_MUTEX(rc, env, MDB_MUTEX(env, w))) rc = mdb_mutex_lock(env, MDB_MUTEX(env, w));
if (unlikely(rc))
return rc; return rc;
txn->mt_txnid = ti->mti_txnid; txn->mt_txnid = ti->mti_txnid;
meta = env->me_metas[txn->mt_txnid & 1]; meta = env->me_metas[txn->mt_txnid & 1];
@@ -3247,7 +3090,7 @@ mdb_txn_reset0(MDB_txn *txn, const char *act_)
env->me_txn = NULL; env->me_txn = NULL;
/* The writer mutex was locked in mdb_txn_begin. */ /* The writer mutex was locked in mdb_txn_begin. */
if (env->me_txns) if (env->me_txns)
UNLOCK_MUTEX(MDB_MUTEX(env, w)); mdb_mutex_unlock(env, MDB_MUTEX(env, w));
} else { } else {
txn->mt_parent->mt_child = NULL; txn->mt_parent->mt_child = NULL;
env->me_pgstate = ((MDB_ntxn *)txn)->mnt_pgstate; env->me_pgstate = ((MDB_ntxn *)txn)->mnt_pgstate;
@@ -3948,7 +3791,7 @@ done:
mdb_dbis_update(txn, 1); mdb_dbis_update(txn, 1);
if (env->me_txns) if (env->me_txns)
UNLOCK_MUTEX(MDB_MUTEX(env, w)); mdb_mutex_unlock(env, MDB_MUTEX(env, w));
if (txn != env->me_txn0) if (txn != env->me_txn0)
free(txn); free(txn);
@@ -4206,10 +4049,6 @@ mdb_env_create(MDB_env **env)
e->me_fd = INVALID_HANDLE_VALUE; e->me_fd = INVALID_HANDLE_VALUE;
e->me_lfd = INVALID_HANDLE_VALUE; e->me_lfd = INVALID_HANDLE_VALUE;
e->me_mfd = INVALID_HANDLE_VALUE; e->me_mfd = INVALID_HANDLE_VALUE;
#ifdef MDB_USE_SYSV_SEM
e->me_rmutex.semid = -1;
e->me_wmutex.semid = -1;
#endif
e->me_pid = getpid(); e->me_pid = getpid();
GET_PAGESIZE(e->me_os_psize); GET_PAGESIZE(e->me_os_psize);
VALGRIND_CREATE_MEMPOOL(e,0,0); VALGRIND_CREATE_MEMPOOL(e,0,0);
@@ -4552,11 +4391,7 @@ mdb_env_excl_lock(MDB_env *env, int *excl)
(rc = errno) == EINTR) ; (rc = errno) == EINTR) ;
if (!rc) { if (!rc) {
*excl = 1; *excl = 1;
} else } else {
#ifdef MDB_USE_SYSV_SEM
if (*excl < 0) /* always true when !MDB_USE_SYSV_SEM */
#endif
{
lock_info.l_type = F_RDLCK; lock_info.l_type = F_RDLCK;
while ((rc = fcntl(env->me_lfd, F_SETLKW, &lock_info)) && while ((rc = fcntl(env->me_lfd, F_SETLKW, &lock_info)) &&
(rc = errno) == EINTR) ; (rc = errno) == EINTR) ;
@@ -4669,10 +4504,6 @@ static int ESECT
mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl) mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
{ {
int fdflags; int fdflags;
#ifdef MDB_USE_SYSV_SEM
int semid;
union semun semu;
#endif
int rc; int rc;
off_t size, rsize; off_t size, rsize;
void *m; void *m;
@@ -4719,28 +4550,17 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
env->me_txns = m; env->me_txns = m;
if (*excl > 0) { if (*excl > 0) {
#ifdef MDB_USE_SYSV_SEM
unsigned short vals[2] = {1, 1};
semid = semget(IPC_PRIVATE, 2, mode);
if (semid < 0)
goto fail_errno;
semu.array = vals;
if (semctl(semid, 0, SETALL, semu) < 0)
goto fail_errno;
env->me_txns->mti_semid = semid;
#else /* MDB_USE_SYSV_SEM */
pthread_mutexattr_t mattr; pthread_mutexattr_t mattr;
if ((rc = pthread_mutexattr_init(&mattr)) if ((rc = pthread_mutexattr_init(&mattr))
|| (rc = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED)) || (rc = pthread_mutexattr_setpshared(&mattr, PTHREAD_PROCESS_SHARED))
#ifdef MDB_ROBUST_SUPPORTED #ifdef EOWNERDEAD
|| (rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST)) || (rc = pthread_mutexattr_setrobust(&mattr, PTHREAD_MUTEX_ROBUST))
#endif #endif
|| (rc = pthread_mutex_init(&env->me_txns->mti_rmutex, &mattr)) || (rc = pthread_mutex_init(&env->me_txns->mti_rmutex, &mattr))
|| (rc = pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr))) || (rc = pthread_mutex_init(&env->me_txns->mti_wmutex, &mattr)))
goto fail; goto fail;
pthread_mutexattr_destroy(&mattr); pthread_mutexattr_destroy(&mattr);
#endif /* MDB_USE_SYSV_SEM */
env->me_txns->mti_magic = MDB_MAGIC; env->me_txns->mti_magic = MDB_MAGIC;
env->me_txns->mti_format = MDB_LOCK_FORMAT; env->me_txns->mti_format = MDB_LOCK_FORMAT;
@@ -4748,9 +4568,6 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
env->me_txns->mti_numreaders = 0; env->me_txns->mti_numreaders = 0;
} else { } else {
#ifdef MDB_USE_SYSV_SEM
struct semid_ds buf;
#endif
if (env->me_txns->mti_magic != MDB_MAGIC) { if (env->me_txns->mti_magic != MDB_MAGIC) {
mdb_debug("lock region has invalid magic"); mdb_debug("lock region has invalid magic");
rc = MDB_INVALID; rc = MDB_INVALID;
@@ -4766,25 +4583,7 @@ mdb_env_setup_locks(MDB_env *env, char *lpath, int mode, int *excl)
if (rc && rc != EACCES && rc != EAGAIN) { if (rc && rc != EACCES && rc != EAGAIN) {
goto fail; goto fail;
} }
#ifdef MDB_USE_SYSV_SEM
semid = env->me_txns->mti_semid;
semu.buf = &buf;
/* check for read access */
if (semctl(semid, 0, IPC_STAT, semu) < 0)
goto fail_errno;
/* check for write access */
if (semctl(semid, 0, IPC_SET, semu) < 0)
goto fail_errno;
#endif
} }
#ifdef MDB_USE_SYSV_SEM
env->me_rmutex.semid = semid;
env->me_wmutex.semid = semid;
env->me_rmutex.semnum = 0;
env->me_wmutex.semnum = 1;
env->me_rmutex.locked = &env->me_txns->mti_rlocked;
env->me_wmutex.locked = &env->me_txns->mti_wlocked;
#endif
return MDB_SUCCESS; return MDB_SUCCESS;
@@ -4929,16 +4728,15 @@ mdb_env_open(MDB_env *env, const char *path, unsigned flags, mode_t mode)
} }
leave: leave:
if (rc) { if (rc)
mdb_env_close0(env, excl); mdb_env_close0(env);
}
free(lpath); free(lpath);
return rc; return rc;
} }
/** Destroy resources from mdb_env_open(), clear our readers & DBIs */ /** Destroy resources from mdb_env_open(), clear our readers & DBIs */
static void ESECT static void ESECT
mdb_env_close0(MDB_env *env, int excl) mdb_env_close0(MDB_env *env)
{ {
int i; int i;
@@ -4990,17 +4788,6 @@ mdb_env_close0(MDB_env *env, int excl)
if (env->me_txns->mti_readers[i].mr_pid == pid) if (env->me_txns->mti_readers[i].mr_pid == pid)
env->me_txns->mti_readers[i].mr_pid = 0; env->me_txns->mti_readers[i].mr_pid = 0;
mdb_coherent_barrier(); mdb_coherent_barrier();
#ifdef MDB_USE_SYSV_SEM
if (env->me_rmutex.semid != -1) {
/* If we have the filelock: If we are the
* only remaining user, clean up semaphores.
*/
if (excl == 0)
mdb_env_excl_lock(env, &excl);
if (excl > 0)
semctl(env->me_rmutex.semid, 0, IPC_RMID);
}
#endif
munmap((void *)env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo)); munmap((void *)env->me_txns, (env->me_maxreaders-1)*sizeof(MDB_reader)+sizeof(MDB_txninfo));
} }
if (env->me_lfd != INVALID_HANDLE_VALUE) { if (env->me_lfd != INVALID_HANDLE_VALUE) {
@@ -5025,7 +4812,7 @@ mdb_env_close(MDB_env *env)
free(dp); free(dp);
} }
mdb_env_close0(env, 0); mdb_env_close0(env);
free(env); free(env);
} }
@@ -8919,15 +8706,9 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
pthread_mutex_init(&my.mc_mutex, NULL); pthread_mutex_init(&my.mc_mutex, NULL);
pthread_cond_init(&my.mc_cond, NULL); pthread_cond_init(&my.mc_cond, NULL);
#ifdef HAVE_MEMALIGN
my.mc_wbuf[0] = memalign(env->me_os_psize, MDB_WBUF*2);
if (my.mc_wbuf[0] == NULL)
return errno;
#else
rc = posix_memalign((void **)&my.mc_wbuf[0], env->me_os_psize, MDB_WBUF*2); rc = posix_memalign((void **)&my.mc_wbuf[0], env->me_os_psize, MDB_WBUF*2);
if (rc) if (rc)
return rc; return rc;
#endif
memset(my.mc_wbuf[0], 0, MDB_WBUF*2); memset(my.mc_wbuf[0], 0, MDB_WBUF*2);
my.mc_wbuf[1] = my.mc_wbuf[0] + MDB_WBUF; my.mc_wbuf[1] = my.mc_wbuf[0] + MDB_WBUF;
my.mc_wlen[0] = 0; my.mc_wlen[0] = 0;
@@ -9013,7 +8794,7 @@ static int ESECT
mdb_env_copyfd0(MDB_env *env, HANDLE fd) mdb_env_copyfd0(MDB_env *env, HANDLE fd)
{ {
MDB_txn *txn = NULL; MDB_txn *txn = NULL;
mdb_mutex_t *wmutex = NULL; pthread_mutex_t *wmutex = NULL;
int rc; int rc;
size_t wsize; size_t wsize;
char *ptr; char *ptr;
@@ -9033,12 +8814,13 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd)
/* Temporarily block writers until we snapshot the meta pages */ /* Temporarily block writers until we snapshot the meta pages */
wmutex = MDB_MUTEX(env, w); wmutex = MDB_MUTEX(env, w);
if (LOCK_MUTEX(rc, env, wmutex)) rc = mdb_mutex_lock(env, wmutex);
if (unlikely(rc))
goto leave; goto leave;
rc = mdb_txn_renew0(txn); rc = mdb_txn_renew0(txn);
if (rc) { if (rc) {
UNLOCK_MUTEX(wmutex); mdb_mutex_unlock(env, wmutex);
goto leave; goto leave;
} }
} }
@@ -9062,8 +8844,7 @@ mdb_env_copyfd0(MDB_env *env, HANDLE fd)
break; break;
} }
} }
if (wmutex) mdb_mutex_unlock(env, wmutex);
UNLOCK_MUTEX(wmutex);
if (rc) if (rc)
goto leave; goto leave;
@@ -9755,7 +9536,7 @@ mdb_reader_check(MDB_env *env, int *dead)
/** As #mdb_reader_check(). rlocked = <caller locked the reader mutex>. */ /** As #mdb_reader_check(). rlocked = <caller locked the reader mutex>. */
static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead) static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead)
{ {
mdb_mutex_t *rmutex = rlocked ? NULL : MDB_MUTEX(env, r); pthread_mutex_t *rmutex = rlocked ? NULL : MDB_MUTEX(env, r);
unsigned i, j, rdrs; unsigned i, j, rdrs;
MDB_reader *mr; MDB_reader *mr;
pid_t *pids, pid; pid_t *pids, pid;
@@ -9775,7 +9556,7 @@ static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead)
/* Stale reader found */ /* Stale reader found */
j = i; j = i;
if (rmutex) { if (rmutex) {
if ((rc = LOCK_MUTEX0(rmutex)) != 0) { if ((rc = pthread_mutex_lock(rmutex)) != 0) {
if ((rc = mdb_mutex_failed(env, rmutex, rc))) if ((rc = mdb_mutex_failed(env, rmutex, rc)))
break; break;
rdrs = 0; /* the above checked all readers */ rdrs = 0; /* the above checked all readers */
@@ -9793,7 +9574,7 @@ static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead)
count++; count++;
} }
if (rmutex) if (rmutex)
UNLOCK_MUTEX(rmutex); mdb_mutex_unlock(env, rmutex);
} }
} }
} }
@@ -9804,19 +9585,11 @@ static int mdb_reader_check0(MDB_env *env, int rlocked, int *dead)
return rc; return rc;
} }
#ifdef MDB_ROBUST_SUPPORTED static int mdb_mutex_failed(MDB_env *env, pthread_mutex_t *mutex, int rc)
/** Handle #LOCK_MUTEX0() failure.
* Try to repair the lock file if the mutex owner died.
* @param[in] env the environment handle
* @param[in] mutex LOCK_MUTEX0() mutex
* @param[in] rc LOCK_MUTEX0() error (nonzero)
* @return 0 on success with the mutex locked, or an error code on failure.
*/
static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc)
{ {
int toggle, rlocked, rc2; #ifdef EOWNERDEAD
if (unlikely(rc == EOWNERDEAD)) {
if (rc == MDB_OWNERDEAD) { int rlocked, rc2;
/* We own the mutex. Clean up after dead previous owner. */ /* We own the mutex. Clean up after dead previous owner. */
rc = MDB_SUCCESS; rc = MDB_SUCCESS;
rlocked = (mutex == MDB_MUTEX(env, r)); rlocked = (mutex == MDB_MUTEX(env, r));
@@ -9824,7 +9597,7 @@ static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc)
/* Keep mti_txnid updated, otherwise next writer can /* Keep mti_txnid updated, otherwise next writer can
* overwrite data which latest meta page refers to. * overwrite data which latest meta page refers to.
*/ */
toggle = mdb_env_pick_meta(env); int toggle = mdb_env_pick_meta(env);
env->me_txns->mti_txnid = env->me_metas[toggle]->mm_txnid; env->me_txns->mti_txnid = env->me_metas[toggle]->mm_txnid;
/* env is hosed if the dead thread was ours */ /* env is hosed if the dead thread was ours */
if (env->me_txn) { if (env->me_txn) {
@@ -9837,18 +9610,33 @@ static int mdb_mutex_failed(MDB_env *env, mdb_mutex_t *mutex, int rc)
(rc ? "this process' env is hosed" : "recovering")); (rc ? "this process' env is hosed" : "recovering"));
rc2 = mdb_reader_check0(env, rlocked, NULL); rc2 = mdb_reader_check0(env, rlocked, NULL);
if (rc2 == 0) if (rc2 == 0)
rc2 = mdb_mutex_consistent(mutex); rc2 = pthread_mutex_consistent(mutex);
if (rc || (rc = rc2)) { if (rc || (rc = rc2)) {
mdb_debug("LOCK_MUTEX recovery failed, %s", mdb_strerror(rc)); mdb_debug("mutex recovery failed, %s", mdb_strerror(rc));
UNLOCK_MUTEX(mutex); pthread_mutex_unlock(mutex);
} }
} else { }
mdb_debug("LOCK_MUTEX failed, %s", mdb_strerror(rc)); #endif /* EOWNERDEAD */
if (unlikely(rc)) {
mdb_debug("lock mutex failed, %s", mdb_strerror(rc));
env->me_flags |= MDB_FATAL_ERROR;
rc = MDB_PANIC;
} }
return rc; return rc;
} }
#endif /* MDB_ROBUST_SUPPORTED */
static int mdb_mutex_lock(MDB_env *env, pthread_mutex_t *mutex) {
int rc = pthread_mutex_lock(mutex);
if (unlikely(rc))
rc = mdb_mutex_failed(env, mutex, rc);
return rc;
}
static void mdb_mutex_unlock(MDB_env *env, pthread_mutex_t *mutex) {
int rc = pthread_mutex_unlock(mutex);
mdb_assert(env, rc == 0);
}
void void
mdb_env_set_oomfunc(MDB_env *env, MDB_oom_func *oomfunc) mdb_env_set_oomfunc(MDB_env *env, MDB_oom_func *oomfunc)