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mariadb/storage/innobase/include/sync0rw.ic
aivanov@mysql.com d33b523271 Applied innodb-5.1-ss269 snapshot. 
Fixed BUGS:
  #3300: "UPDATE statement with no index column in where condition locks
    all rows"
    Implement semi-consistent read to reduce lock conflicts at the cost
    of breaking serializability.
    ha_innobase::unlock_row(): reset the "did semi consistent read" flag
    ha_innobase::was_semi_consistent_read(),
    ha_innobase::try_semi_consistent_read(): new methods
    row_prebuilt_t, row_create_prebuilt(): add field row_read_type for
    keeping track of semi-consistent reads
    row_vers_build_for_semi_consistent_read(),
    row_sel_build_committed_vers_for_mysql(): new functions
    row_search_for_mysql(): implement semi-consistent reads

  #9802: "Foreign key checks disallow alter table".
    Added test cases.

  #12456: "Cursor shows incorrect data - DML does not affect,
    probably caching"
    This patch implements a high-granularity read view to be used with
    cursors. In this high-granularity consistent read view modifications 
    done by the creating transaction after the cursor is created or 
   future transactions are not visible. But those modifications that 
   transaction did before the cursor was created are visible.

  #12701: "Support >4GB buffer pool and log files on 64-bit Windows"
    Do not call os_file_create_tmpfile() at runtime. Instead, create all
    tempfiles at startup and guard access to them with mutexes.

  #13778: "If FOREIGN_KEY_CHECKS=0, one can create inconsistent FOREIGN KEYs".
    When FOREIGN_KEY_CHECKS=0 we still need to check that datatypes between
    foreign key references are compatible.

  #14189: "VARBINARY and BINARY variables: trailing space ignored with InnoDB"
    innobase_init(): Assert that
    DATA_MYSQL_BINARY_CHARSET_COLL == my_charset_bin.number.
    dtype_get_pad_char(): Do not pad VARBINARY or BINARY columns.
    row_ins_cascade_calc_update_vec(): Refuse ON UPDATE CASCADE when trying
    to change the length of a VARBINARY column that refers to or is referenced
    by a BINARY column. BINARY columns are no longer padded on comparison,
    and thus they cannot be padded on storage either.

  #14747: "Race condition can cause btr_search_drop_page_hash_index() to crash"
    Note that buf_block_t::index should be protected by btr_search_latch
    or an s-latch or x-latch on the index page.
    btr_search_drop_page_hash_index(): Read block->index while holding
    btr_search_latch and use the cached value in the loop.  Remove some
    redundant assertions.

  #15108: "mysqld crashes when innodb_log_file_size is set > 4G"

  #15308: "Problem of Order with Enum Column in Primary Key"

  #15550: "mysqld crashes in printing a FOREIGN KEY error in InnoDB"
    row_ins_foreign_report_add_err(): When printing the parent record,
    use the index in the parent table rather than the index in the child table.

  #15653: "Slow inserts to InnoDB if many thousands of .ibd files"
    Keep track on unflushed modifications to file spaces.  When there are tens
    of thousands of file spaces, flushing all files in fil_flush_file_spaces()
    would be very slow.
    fil_flush_file_spaces(): Only flush unflushed file spaces.
    fil_space_t, fil_system_t: Add a list of unflushed spaces.

  #15991: "innodb-file-per-table + symlink database + rename = cr"
   os_file_handle_error(): Map the error codes EXDEV, ENOTDIR, and EISDIR
   to the new code OS_FILE_PATH_ERROR. Treat this code as OS_FILE_PATH_ERROR.
   This fixes the crash on RENAME TABLE when the .ibd file is a symbolic link
   to a different file system.

  #16157: "InnoDB crashes when main location settings are empty"
    This patch is from Heikki.

  #16298: "InnoDB segfaults in INSERTs in upgrade of 4.0 -> 5.0 tables
    with VARCHAR BINARY"
    dict_load_columns(): Set the charset-collation code
    DATA_MYSQL_BINARY_CHARSET_COLL for those binary string columns
    that lack a charset-collation code, i.e., the tables were created
    with an older version of MySQL/InnoDB than 4.1.2.

  #16229: "MySQL/InnoDB uses full explicit table locks in trigger processing"
    Take a InnoDB table lock only if user has explicitly requested a table
    lock. Added some additional comments to store_lock() and external_lock().

  #16387: "InnoDB crash when dropping a foreign key <table>_ibfk_0"
    Do not mistake TABLENAME_ibfk_0 for auto-generated id.
    dict_table_get_highest_foreign_id(): Ignore foreign constraint
    identifiers starting with the pattern TABLENAME_ibfk_0.

  #16582: "InnoDB: Error in an adaptive hash index pointer to page"
    Account for a race condition when dropping the adaptive hash index
    for a B-tree page.
    btr_search_drop_page_hash_index(): Retry the operation if a hash index
    with different parameters was built meanwhile.  Add diagnostics for the
    case that hash node pointers to the page remain.
    btr_search_info_update_hash(), btr_search_info_update_slow():
    Document the parameter "info" as in/out.

  #16814: "SHOW INNODB STATUS format error in LATEST FOREIGN KEY ERROR
    section"
    Add a missing newline to the LAST FOREIGN KEY ERROR section in SHOW
    INNODB STATUS output.
    dict_foreign_error_report(): Always print a newline after invoking
    dict_print_info_on_foreign_key_in_create_format().

  #16827: "Better InnoDB error message if ibdata files omitted from my.cnf"

  #17126: "CHECK TABLE on InnoDB causes a short hang during check of adaptive
    hash"
    CHECK TABLE blocking other queries, by releasing the btr_search_latch
    periodically during the adaptive hash table validation.

  #17405: "Valgrind: conditional jump or move depends on unititialised values"
    buf_block_init(): Reset magic_n, buf_fix_count and io_fix to avoid
    testing uninitialized variables.
2006-03-10 19:22:21 +03:00

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/******************************************************
The read-write lock (for threads)
(c) 1995 Innobase Oy
Created 9/11/1995 Heikki Tuuri
*******************************************************/
/**********************************************************************
Lock an rw-lock in shared mode for the current thread. If the rw-lock is
locked in exclusive mode, or there is an exclusive lock request waiting,
the function spins a preset time (controlled by SYNC_SPIN_ROUNDS),
waiting for the lock before suspending the thread. */
void
rw_lock_s_lock_spin(
/*================*/
rw_lock_t* lock, /* in: pointer to rw-lock */
ulint pass, /* in: pass value; != 0, if the lock will
be passed to another thread to unlock */
const char* file_name,/* in: file name where lock requested */
ulint line); /* in: line where requested */
#ifdef UNIV_SYNC_DEBUG
/**********************************************************************
Inserts the debug information for an rw-lock. */
void
rw_lock_add_debug_info(
/*===================*/
rw_lock_t* lock, /* in: rw-lock */
ulint pass, /* in: pass value */
ulint lock_type, /* in: lock type */
const char* file_name, /* in: file where requested */
ulint line); /* in: line where requested */
/**********************************************************************
Removes a debug information struct for an rw-lock. */
void
rw_lock_remove_debug_info(
/*======================*/
rw_lock_t* lock, /* in: rw-lock */
ulint pass, /* in: pass value */
ulint lock_type); /* in: lock type */
#endif /* UNIV_SYNC_DEBUG */
/************************************************************************
Accessor functions for rw lock. */
UNIV_INLINE
ulint
rw_lock_get_waiters(
/*================*/
rw_lock_t* lock)
{
return(lock->waiters);
}
UNIV_INLINE
void
rw_lock_set_waiters(
/*================*/
rw_lock_t* lock,
ulint flag)
{
lock->waiters = flag;
}
UNIV_INLINE
ulint
rw_lock_get_writer(
/*===============*/
rw_lock_t* lock)
{
return(lock->writer);
}
UNIV_INLINE
void
rw_lock_set_writer(
/*===============*/
rw_lock_t* lock,
ulint flag)
{
lock->writer = flag;
}
UNIV_INLINE
ulint
rw_lock_get_reader_count(
/*=====================*/
rw_lock_t* lock)
{
return(lock->reader_count);
}
UNIV_INLINE
void
rw_lock_set_reader_count(
/*=====================*/
rw_lock_t* lock,
ulint count)
{
lock->reader_count = count;
}
UNIV_INLINE
mutex_t*
rw_lock_get_mutex(
/*==============*/
rw_lock_t* lock)
{
return(&(lock->mutex));
}
/**********************************************************************
Returns the value of writer_count for the lock. Does not reserve the lock
mutex, so the caller must be sure it is not changed during the call. */
UNIV_INLINE
ulint
rw_lock_get_x_lock_count(
/*=====================*/
/* out: value of writer_count */
rw_lock_t* lock) /* in: rw-lock */
{
return(lock->writer_count);
}
/**********************************************************************
Low-level function which tries to lock an rw-lock in s-mode. Performs no
spinning. */
UNIV_INLINE
ibool
rw_lock_s_lock_low(
/*===============*/
/* out: TRUE if success */
rw_lock_t* lock, /* in: pointer to rw-lock */
ulint pass __attribute__((unused)),
/* in: pass value; != 0, if the lock will be
passed to another thread to unlock */
const char* file_name, /* in: file name where lock requested */
ulint line) /* in: line where requested */
{
#ifdef UNIV_SYNC_DEBUG
ut_ad(mutex_own(rw_lock_get_mutex(lock)));
#endif /* UNIV_SYNC_DEBUG */
/* Check if the writer field is free */
if (UNIV_LIKELY(lock->writer == RW_LOCK_NOT_LOCKED)) {
/* Set the shared lock by incrementing the reader count */
lock->reader_count++;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, pass, RW_LOCK_SHARED, file_name,
line);
#endif
lock->last_s_file_name = file_name;
lock->last_s_line = line;
return(TRUE); /* locking succeeded */
}
return(FALSE); /* locking did not succeed */
}
/**********************************************************************
Low-level function which locks an rw-lock in s-mode when we know that it
is possible and none else is currently accessing the rw-lock structure.
Then we can do the locking without reserving the mutex. */
UNIV_INLINE
void
rw_lock_s_lock_direct(
/*==================*/
rw_lock_t* lock, /* in: pointer to rw-lock */
const char* file_name, /* in: file name where requested */
ulint line) /* in: line where lock requested */
{
ut_ad(lock->writer == RW_LOCK_NOT_LOCKED);
ut_ad(rw_lock_get_reader_count(lock) == 0);
/* Set the shared lock by incrementing the reader count */
lock->reader_count++;
lock->last_s_file_name = file_name;
lock->last_s_line = line;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, 0, RW_LOCK_SHARED, file_name, line);
#endif
}
/**********************************************************************
Low-level function which locks an rw-lock in x-mode when we know that it
is not locked and none else is currently accessing the rw-lock structure.
Then we can do the locking without reserving the mutex. */
UNIV_INLINE
void
rw_lock_x_lock_direct(
/*==================*/
rw_lock_t* lock, /* in: pointer to rw-lock */
const char* file_name, /* in: file name where requested */
ulint line) /* in: line where lock requested */
{
ut_ad(rw_lock_validate(lock));
ut_ad(rw_lock_get_reader_count(lock) == 0);
ut_ad(rw_lock_get_writer(lock) == RW_LOCK_NOT_LOCKED);
rw_lock_set_writer(lock, RW_LOCK_EX);
lock->writer_thread = os_thread_get_curr_id();
lock->writer_count++;
lock->pass = 0;
lock->last_x_file_name = file_name;
lock->last_x_line = line;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, 0, RW_LOCK_EX, file_name, line);
#endif
}
/**********************************************************************
NOTE! Use the corresponding macro, not directly this function! Lock an
rw-lock in shared mode for the current thread. If the rw-lock is locked
in exclusive mode, or there is an exclusive lock request waiting, the
function spins a preset time (controlled by SYNC_SPIN_ROUNDS), waiting for
the lock, before suspending the thread. */
UNIV_INLINE
void
rw_lock_s_lock_func(
/*================*/
rw_lock_t* lock, /* in: pointer to rw-lock */
ulint pass, /* in: pass value; != 0, if the lock will
be passed to another thread to unlock */
const char* file_name,/* in: file name where lock requested */
ulint line) /* in: line where requested */
{
/* NOTE: As we do not know the thread ids for threads which have
s-locked a latch, and s-lockers will be served only after waiting
x-lock requests have been fulfilled, then if this thread already
owns an s-lock here, it may end up in a deadlock with another thread
which requests an x-lock here. Therefore, we will forbid recursive
s-locking of a latch: the following assert will warn the programmer
of the possibility of a tjis kind of deadlock. If we want to implement
safe recursive s-locking, we should keep in a list the thread ids of
the threads which have s-locked a latch. This would use some CPU
time. */
#ifdef UNIV_SYNC_DEBUG
ut_ad(!rw_lock_own(lock, RW_LOCK_SHARED)); /* see NOTE above */
#endif /* UNIV_SYNC_DEBUG */
mutex_enter(rw_lock_get_mutex(lock));
if (UNIV_LIKELY(rw_lock_s_lock_low(lock, pass, file_name, line))) {
mutex_exit(rw_lock_get_mutex(lock));
return; /* Success */
} else {
/* Did not succeed, try spin wait */
mutex_exit(rw_lock_get_mutex(lock));
rw_lock_s_lock_spin(lock, pass, file_name, line);
return;
}
}
/**********************************************************************
NOTE! Use the corresponding macro, not directly this function! Lock an
rw-lock in shared mode for the current thread if the lock can be acquired
immediately. */
UNIV_INLINE
ibool
rw_lock_s_lock_func_nowait(
/*=======================*/
/* out: TRUE if success */
rw_lock_t* lock, /* in: pointer to rw-lock */
const char* file_name,/* in: file name where lock requested */
ulint line) /* in: line where requested */
{
ibool success = FALSE;
mutex_enter(rw_lock_get_mutex(lock));
if (lock->writer == RW_LOCK_NOT_LOCKED) {
/* Set the shared lock by incrementing the reader count */
lock->reader_count++;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, 0, RW_LOCK_SHARED, file_name,
line);
#endif
lock->last_s_file_name = file_name;
lock->last_s_line = line;
success = TRUE;
}
mutex_exit(rw_lock_get_mutex(lock));
return(success);
}
/**********************************************************************
NOTE! Use the corresponding macro, not directly this function! Lock an
rw-lock in exclusive mode for the current thread if the lock can be
obtained immediately. */
UNIV_INLINE
ibool
rw_lock_x_lock_func_nowait(
/*=======================*/
/* out: TRUE if success */
rw_lock_t* lock, /* in: pointer to rw-lock */
const char* file_name,/* in: file name where lock requested */
ulint line) /* in: line where requested */
{
ibool success = FALSE;
os_thread_id_t curr_thread = os_thread_get_curr_id();
mutex_enter(rw_lock_get_mutex(lock));
if (UNIV_UNLIKELY(rw_lock_get_reader_count(lock) != 0)) {
} else if (UNIV_LIKELY(rw_lock_get_writer(lock)
== RW_LOCK_NOT_LOCKED)) {
rw_lock_set_writer(lock, RW_LOCK_EX);
lock->writer_thread = curr_thread;
lock->pass = 0;
relock:
lock->writer_count++;
#ifdef UNIV_SYNC_DEBUG
rw_lock_add_debug_info(lock, 0, RW_LOCK_EX, file_name, line);
#endif
lock->last_x_file_name = file_name;
lock->last_x_line = line;
success = TRUE;
} else if (rw_lock_get_writer(lock) == RW_LOCK_EX
&& lock->pass == 0
&& os_thread_eq(lock->writer_thread, curr_thread)) {
goto relock;
}
mutex_exit(rw_lock_get_mutex(lock));
ut_ad(rw_lock_validate(lock));
return(success);
}
/**********************************************************************
Releases a shared mode lock. */
UNIV_INLINE
void
rw_lock_s_unlock_func(
/*==================*/
rw_lock_t* lock /* in: rw-lock */
#ifdef UNIV_SYNC_DEBUG
,ulint pass /* in: pass value; != 0, if the lock may have
been passed to another thread to unlock */
#endif
)
{
mutex_t* mutex = &(lock->mutex);
ibool sg = FALSE;
/* Acquire the mutex protecting the rw-lock fields */
mutex_enter(mutex);
/* Reset the shared lock by decrementing the reader count */
ut_ad(lock->reader_count > 0);
lock->reader_count--;
#ifdef UNIV_SYNC_DEBUG
rw_lock_remove_debug_info(lock, pass, RW_LOCK_SHARED);
#endif
/* If there may be waiters and this was the last s-lock,
signal the object */
if (UNIV_UNLIKELY(lock->waiters)
&& lock->reader_count == 0) {
sg = TRUE;
rw_lock_set_waiters(lock, 0);
}
mutex_exit(mutex);
if (UNIV_UNLIKELY(sg)) {
sync_array_signal_object(sync_primary_wait_array, lock);
}
ut_ad(rw_lock_validate(lock));
#ifdef UNIV_SYNC_PERF_STAT
rw_s_exit_count++;
#endif
}
/**********************************************************************
Releases a shared mode lock when we know there are no waiters and none
else will access the lock during the time this function is executed. */
UNIV_INLINE
void
rw_lock_s_unlock_direct(
/*====================*/
rw_lock_t* lock) /* in: rw-lock */
{
/* Reset the shared lock by decrementing the reader count */
ut_ad(lock->reader_count > 0);
lock->reader_count--;
#ifdef UNIV_SYNC_DEBUG
rw_lock_remove_debug_info(lock, 0, RW_LOCK_SHARED);
#endif
ut_ad(!lock->waiters);
ut_ad(rw_lock_validate(lock));
#ifdef UNIV_SYNC_PERF_STAT
rw_s_exit_count++;
#endif
}
/**********************************************************************
Releases an exclusive mode lock. */
UNIV_INLINE
void
rw_lock_x_unlock_func(
/*==================*/
rw_lock_t* lock /* in: rw-lock */
#ifdef UNIV_SYNC_DEBUG
,ulint pass /* in: pass value; != 0, if the lock may have
been passed to another thread to unlock */
#endif
)
{
ibool sg = FALSE;
/* Acquire the mutex protecting the rw-lock fields */
mutex_enter(&(lock->mutex));
/* Reset the exclusive lock if this thread no longer has an x-mode
lock */
ut_ad(lock->writer_count > 0);
lock->writer_count--;
if (lock->writer_count == 0) {
rw_lock_set_writer(lock, RW_LOCK_NOT_LOCKED);
}
#ifdef UNIV_SYNC_DEBUG
rw_lock_remove_debug_info(lock, pass, RW_LOCK_EX);
#endif
/* If there may be waiters, signal the lock */
if (UNIV_UNLIKELY(lock->waiters)
&& lock->writer_count == 0) {
sg = TRUE;
rw_lock_set_waiters(lock, 0);
}
mutex_exit(&(lock->mutex));
if (UNIV_UNLIKELY(sg)) {
sync_array_signal_object(sync_primary_wait_array, lock);
}
ut_ad(rw_lock_validate(lock));
#ifdef UNIV_SYNC_PERF_STAT
rw_x_exit_count++;
#endif
}
/**********************************************************************
Releases an exclusive mode lock when we know there are no waiters, and
none else will access the lock durint the time this function is executed. */
UNIV_INLINE
void
rw_lock_x_unlock_direct(
/*====================*/
rw_lock_t* lock) /* in: rw-lock */
{
/* Reset the exclusive lock if this thread no longer has an x-mode
lock */
ut_ad(lock->writer_count > 0);
lock->writer_count--;
if (lock->writer_count == 0) {
rw_lock_set_writer(lock, RW_LOCK_NOT_LOCKED);
}
#ifdef UNIV_SYNC_DEBUG
rw_lock_remove_debug_info(lock, 0, RW_LOCK_EX);
#endif
ut_ad(!lock->waiters);
ut_ad(rw_lock_validate(lock));
#ifdef UNIV_SYNC_PERF_STAT
rw_x_exit_count++;
#endif
}
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