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#include "myisam_priv.h"
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#include "drizzled/charset_info.h"
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#include <drizzled/util/test.h>
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using namespace drizzled;
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#include "myisamdef.h"
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#include <mystrings/m_ctype.h>
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#include <mysys/my_tree.h>
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#include <mysys/queues.h>
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/* lock table by F_UNLCK, F_RDLCK or F_WRLCK */
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int mi_lock_database(MI_INFO *info, int lock_type)
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MYISAM_SHARE *share=info->s;
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info->s->in_use= new list<Session *>;
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if (share->options & HA_OPTION_READ_ONLY_DATA ||
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info->lock_type == lock_type)
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if (lock_type == F_EXTRA_LCK) /* Used by TMP tables */
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++share->tot_locks;
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info->lock_type= lock_type;
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info->s->in_use->push_front(info->in_use);
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info->s->in_use= list_add(info->s->in_use, &info->in_use);
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pthread_mutex_lock(&share->intern_lock);
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if (share->kfile >= 0) /* May only be false on windows */
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switch (lock_type) {
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count= --share->w_locks;
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--share->tot_locks;
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if (info->lock_type == F_WRLCK && !share->w_locks &&
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!share->delay_key_write && flush_key_blocks(share->getKeyCache(),
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!share->delay_key_write && flush_key_blocks(share->key_cache,
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share->kfile,FLUSH_KEEP))
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mi_print_error(info->s, HA_ERR_CRASHED);
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mi_mark_crashed(info); /* Mark that table must be checked */
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if (share->changed && !share->w_locks)
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if ((info->s->mmaped_length != info->s->state.state.data_file_length) &&
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(info->s->nonmmaped_inserts > MAX_NONMAPPED_INSERTS))
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if (info->s->concurrent_insert)
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rw_wrlock(&info->s->mmap_lock);
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mi_remap_file(info, info->s->state.state.data_file_length);
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info->s->nonmmaped_inserts= 0;
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if (info->s->concurrent_insert)
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rw_unlock(&info->s->mmap_lock);
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share->state.process= share->last_process=share->this_process;
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share->state.unique= info->last_unique= info->this_unique;
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share->state.update_count= info->last_loop= ++info->this_loop;
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if (mi_state_info_write(share->kfile, &share->state, 1))
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if (my_sync(share->kfile, MYF(0)))
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if (my_sync(info->dfile, MYF(0)))
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share->not_flushed=1;
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mi_print_error(info->s, HA_ERR_CRASHED);
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if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
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if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
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_mi_test_if_changed(info);
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VOID(_mi_test_if_changed(info));
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share->r_locks++;
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share->tot_locks++;
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info->lock_type=lock_type;
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info->s->in_use->push_front(info->in_use);
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info->s->in_use= list_add(info->s->in_use, &info->in_use);
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if (info->lock_type == F_RDLCK)
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if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
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_mi_test_if_changed(info);
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VOID(_mi_test_if_changed(info));
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info->lock_type=lock_type;
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info->invalidator=info->s->invalidator;
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share->w_locks++;
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share->tot_locks++;
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info->s->in_use->push_front(info->in_use);
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info->s->in_use= list_add(info->s->in_use, &info->in_use);
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break; /* Impossible */
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pthread_mutex_unlock(&share->intern_lock);
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#if defined(FULL_LOG) || defined(_lint)
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lock_type|=(int) (flag << 8); /* Set bit to set if real lock */
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myisam_log_command(MI_LOG_LOCK,info,(unsigned char*) &lock_type,sizeof(lock_type),
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myisam_log_command(MI_LOG_LOCK,info,(uchar*) &lock_type,sizeof(lock_type),
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/****************************************************************************
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The following functions are called by thr_lock() in threaded applications
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****************************************************************************/
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Create a copy of the current status for the table
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param Pointer to Myisam handler
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concurrent_insert Set to 1 if we are going to do concurrent inserts
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(THR_WRITE_CONCURRENT_INSERT was used)
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void mi_get_status(void* param, int concurrent_insert)
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MI_INFO *info=(MI_INFO*) param;
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info->save_state=info->s->state.state;
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info->state= &info->save_state;
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info->append_insert_at_end= concurrent_insert;
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void mi_update_status(void* param)
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MI_INFO *info=(MI_INFO*) param;
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Because someone may have closed the table we point at, we only
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update the state if its our own state. This isn't a problem as
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we are always pointing at our own lock or at a read lock.
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(This is enforced by thr_multi_lock.c)
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if (info->state == &info->save_state)
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info->s->state.state= *info->state;
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info->state= &info->s->state.state;
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info->append_insert_at_end= 0;
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We have to flush the write cache here as other threads may start
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reading the table before mi_lock_database() is called
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if (info->opt_flag & WRITE_CACHE_USED)
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if (end_io_cache(&info->rec_cache))
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mi_print_error(info->s, HA_ERR_CRASHED);
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mi_mark_crashed(info);
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info->opt_flag&= ~WRITE_CACHE_USED;
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void mi_restore_status(void *param)
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MI_INFO *info= (MI_INFO*) param;
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info->state= &info->s->state.state;
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info->append_insert_at_end= 0;
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void mi_copy_status(void* to,void *from)
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((MI_INFO*) to)->state= &((MI_INFO*) from)->save_state;
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Check if should allow concurrent inserts
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Allow concurrent inserts if we don't have a hole in the table or
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if there is no active write lock and there is active read locks and
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myisam_concurrent_insert == 2. In this last case the new
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row('s) are inserted at end of file instead of filling up the hole.
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The last case is to allow one to inserts into a heavily read-used table
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even if there is holes.
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If there is a an rtree indexes in the table, concurrent inserts are
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disabled in mi_open()
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0 ok to use concurrent inserts
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bool mi_check_status(void *param)
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MI_INFO *info=(MI_INFO*) param;
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The test for w_locks == 1 is here because this thread has already done an
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external lock (in other words: w_locks == 1 means no other threads has
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return (my_bool) !(info->s->state.dellink == HA_OFFSET_ERROR ||
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(myisam_concurrent_insert == 2 && info->s->r_locks &&
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info->s->w_locks == 1));
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/****************************************************************************
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** functions to read / write the state
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****************************************************************************/
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if (mi_state_info_read_dsk(share->kfile, &share->state, 1))
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int error=errno ? errno : -1;
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int error=my_errno ? my_errno : -1;
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if (check_keybuffer)
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_mi_test_if_changed(info);
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VOID(_mi_test_if_changed(info));
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info->invalidator=info->s->invalidator;
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else if (lock_type == F_WRLCK && info->lock_type == F_RDLCK)
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errno=EACCES; /* Not allowed to change */
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my_errno=EACCES; /* Not allowed to change */
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return(-1); /* when have read_lock() */
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if (share->tot_locks == 0)
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olderror=errno; /* Remember last error */
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olderror=my_errno; /* Remember last error */
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{ /* Two threads can't be here */
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share->state.process= share->last_process= share->this_process;
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share->state.unique= info->last_unique= info->this_unique;
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share->state.update_count= info->last_loop= ++info->this_loop;
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if ((error=mi_state_info_write(share->kfile, &share->state, 1)))
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_commit(share->kfile);
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_commit(info->dfile);
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else if (operation)
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share->changed= 1; /* Mark keyfile changed */
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share->state.update_count != info->last_loop)
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{ /* Keyfile has changed */
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if (share->state.process != share->this_process)
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flush_key_blocks(share->getKeyCache(), share->kfile, FLUSH_RELEASE);
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VOID(flush_key_blocks(share->key_cache, share->kfile, FLUSH_RELEASE));
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share->last_process=share->state.process;
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info->last_unique= share->state.unique;
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info->last_loop= share->state.update_count;
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int _mi_decrement_open_count(MI_INFO *info)
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unsigned char buff[2];
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register MYISAM_SHARE *share=info->s;
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int lock_error=0,write_error=0;
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if (share->global_changed)
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uint32_t old_lock=info->lock_type;
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uint old_lock=info->lock_type;
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share->global_changed=0;
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lock_error=mi_lock_database(info,F_WRLCK);
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/* Its not fatal even if we couldn't get the lock ! */