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Commit b28a44e9 authored by ingo@mysql.com's avatar ingo@mysql.com
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Bug#10602 - LOAD INDEX INTO CACHE deadlocks 

Fixed two deadlocks.
Made minor changes.
parent effd338f
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Inline Side-by-side
Showing with 91 additions and 30 deletions
mysys/mf_keycache.c
View file @ b28a44e9
......@@ -184,10 +184,18 @@ static void test_key_cache(KEY_CACHE *keycache,
static FILE *keycache_debug_log=NULL;
static void keycache_debug_print _VARARGS((const char *fmt,...));
#define KEYCACHE_DEBUG_OPEN \
if (!keycache_debug_log) keycache_debug_log=fopen(KEYCACHE_DEBUG_LOG, "w")
if (!keycache_debug_log) \
{ \
keycache_debug_log= fopen(KEYCACHE_DEBUG_LOG, "w"); \
(void) setvbuf(keycache_debug_log, NULL, _IOLBF, BUFSIZ); \
}
#define KEYCACHE_DEBUG_CLOSE \
if (keycache_debug_log) { fclose(keycache_debug_log); keycache_debug_log=0; }
if (keycache_debug_log) \
{ \
fclose(keycache_debug_log); \
keycache_debug_log= 0; \
}
#else
#define KEYCACHE_DEBUG_OPEN
#define KEYCACHE_DEBUG_CLOSE
......@@ -213,7 +221,7 @@ static long keycache_thread_id;
#define KEYCACHE_THREAD_TRACE_BEGIN(l) \
{ struct st_my_thread_var *thread_var= my_thread_var; \
keycache_thread_id= my_thread_var->id; \
keycache_thread_id= thread_var->id; \
KEYCACHE_DBUG_PRINT(l,("[thread %ld",keycache_thread_id)) }
#define KEYCACHE_THREAD_TRACE_END(l) \
......@@ -240,12 +248,10 @@ static int keycache_pthread_cond_wait(pthread_cond_t *cond,
static int keycache_pthread_mutex_lock(pthread_mutex_t *mutex);
static void keycache_pthread_mutex_unlock(pthread_mutex_t *mutex);
static int keycache_pthread_cond_signal(pthread_cond_t *cond);
static int keycache_pthread_cond_broadcast(pthread_cond_t *cond);
#else
#define keycache_pthread_mutex_lock pthread_mutex_lock
#define keycache_pthread_mutex_unlock pthread_mutex_unlock
#define keycache_pthread_cond_signal pthread_cond_signal
#define keycache_pthread_cond_broadcast pthread_cond_broadcast
#endif /* defined(KEYCACHE_DEBUG) */
static uint next_power(uint value)
......@@ -508,6 +514,8 @@ int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
keycache->can_be_used= 0;
while (keycache->cnt_for_resize_op)
{
KEYCACHE_DBUG_PRINT("resize_key_cache: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend, &keycache->cache_lock);
}
......@@ -520,7 +528,11 @@ finish:
unlink_from_queue(wqueue, thread);
/* Signal for the next resize request to proceeed if any */
if (wqueue->last_thread)
{
KEYCACHE_DBUG_PRINT("resize_key_cache: signal",
("thread %ld", wqueue->last_thread->next->id));
keycache_pthread_cond_signal(&wqueue->last_thread->next->suspend);
}
keycache_pthread_mutex_unlock(&keycache->cache_lock);
return blocks;
}
......@@ -544,7 +556,11 @@ static inline void dec_counter_for_resize_op(KEY_CACHE *keycache)
struct st_my_thread_var *last_thread;
if (!--keycache->cnt_for_resize_op &&
(last_thread= keycache->resize_queue.last_thread))
{
KEYCACHE_DBUG_PRINT("dec_counter_for_resize_op: signal",
("thread %ld", last_thread->next->id));
keycache_pthread_cond_signal(&last_thread->next->suspend);
}
}
/*
......@@ -761,8 +777,8 @@ static void release_queue(KEYCACHE_WQUEUE *wqueue)
do
{
thread=next;
keycache_pthread_cond_signal(&thread->suspend);
KEYCACHE_DBUG_PRINT("release_queue: signal", ("thread %ld", thread->id));
keycache_pthread_cond_signal(&thread->suspend);
next=thread->next;
thread->next= NULL;
}
......@@ -876,7 +892,8 @@ static void link_block(KEY_CACHE *keycache, BLOCK_LINK *block, my_bool hot,
BLOCK_LINK **pins;
KEYCACHE_DBUG_ASSERT(! (block->hash_link && block->hash_link->requests));
if (!hot && keycache->waiting_for_block.last_thread) {
if (!hot && keycache->waiting_for_block.last_thread)
{
/* Signal that in the LRU warm sub-chain an available block has appeared */
struct st_my_thread_var *last_thread=
keycache->waiting_for_block.last_thread;
......@@ -894,6 +911,7 @@ static void link_block(KEY_CACHE *keycache, BLOCK_LINK *block, my_bool hot,
*/
if ((HASH_LINK *) thread->opt_info == hash_link)
{
KEYCACHE_DBUG_PRINT("link_block: signal", ("thread %ld", thread->id));
keycache_pthread_cond_signal(&thread->suspend);
unlink_from_queue(&keycache->waiting_for_block, thread);
block->requests++;
......@@ -1000,8 +1018,7 @@ static void reg_requests(KEY_CACHE *keycache, BLOCK_LINK *block, int count)
linking it to the LRU chain if it's the last request
SYNOPSIS
unreg_block()
unreg_request()
keycache pointer to a key cache data structure
block pointer to the block to link to the LRU chain
at_end <-> to link the block at the end of the LRU chain
......@@ -1086,6 +1103,9 @@ static inline void wait_for_readers(KEY_CACHE *keycache, BLOCK_LINK *block)
struct st_my_thread_var *thread= my_thread_var;
while (block->hash_link->requests)
{
KEYCACHE_DBUG_PRINT("wait_for_readers: wait",
("suspend thread %ld block %u",
thread->id, BLOCK_NUMBER(block)));
block->condvar= &thread->suspend;
keycache_pthread_cond_wait(&thread->suspend, &keycache->cache_lock);
block->condvar= NULL;
......@@ -1143,6 +1163,7 @@ static void unlink_hash(KEY_CACHE *keycache, HASH_LINK *hash_link)
*/
if (page->file == hash_link->file && page->filepos == hash_link->diskpos)
{
KEYCACHE_DBUG_PRINT("unlink_hash: signal", ("thread %ld", thread->id));
keycache_pthread_cond_signal(&thread->suspend);
unlink_from_queue(&keycache->waiting_for_hash_link, thread);
}
......@@ -1225,6 +1246,8 @@ restart:
page.filepos= filepos;
thread->opt_info= (void *) &page;
link_into_queue(&keycache->waiting_for_hash_link, thread);
KEYCACHE_DBUG_PRINT("get_hash_link: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
thread->opt_info= NULL;
......@@ -1343,6 +1366,8 @@ restart:
add_to_queue(&block->wqueue[COND_FOR_SAVED], thread);
do
{
KEYCACHE_DBUG_PRINT("find_key_block: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
}
......@@ -1360,7 +1385,9 @@ restart:
/* This is a request for a page to be removed from cache */
KEYCACHE_DBUG_PRINT("find_key_block",
("request for old page in block %u",BLOCK_NUMBER(block)));
("request for old page in block %u "
"wrmode: %d block->status: %d",
BLOCK_NUMBER(block), wrmode, block->status));
/*
Only reading requests can proceed until the old dirty page is flushed,
all others are to be suspended, then resubmitted
......@@ -1379,6 +1406,8 @@ restart:
/* Wait until the request can be resubmitted */
do
{
KEYCACHE_DBUG_PRINT("find_key_block: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
}
......@@ -1448,6 +1477,8 @@ restart:
link_into_queue(&keycache->waiting_for_block, thread);
do
{
KEYCACHE_DBUG_PRINT("find_key_block: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
}
......@@ -1528,9 +1559,13 @@ restart:
else
{
/* This is for secondary requests for a new page only */
page_status= block->hash_link == hash_link &&
(block->status & BLOCK_READ) ?
PAGE_READ : PAGE_WAIT_TO_BE_READ;
KEYCACHE_DBUG_PRINT("find_key_block",
("block->hash_link: %p hash_link: %p "
"block->status: %u", block->hash_link,
hash_link, block->status ));
page_status= (((block->hash_link == hash_link) &&
(block->status & BLOCK_READ)) ?
PAGE_READ : PAGE_WAIT_TO_BE_READ);
}
}
keycache->global_cache_read++;
......@@ -1538,17 +1573,22 @@ restart:
else
{
reg_requests(keycache, block, 1);
page_status = block->hash_link == hash_link &&
(block->status & BLOCK_READ) ?
PAGE_READ : PAGE_WAIT_TO_BE_READ;
KEYCACHE_DBUG_PRINT("find_key_block",
("block->hash_link: %p hash_link: %p "
"block->status: %u", block->hash_link,
hash_link, block->status ));
page_status= (((block->hash_link == hash_link) &&
(block->status & BLOCK_READ)) ?
PAGE_READ : PAGE_WAIT_TO_BE_READ);
}
}
KEYCACHE_DBUG_ASSERT(page_status != -1);
*page_st=page_status;
KEYCACHE_DBUG_PRINT("find_key_block",
("fd: %u pos %lu page_status %lu",
(uint) file,(ulong) filepos,(uint) page_status));
("fd: %u pos %lu block->status %u page_status %lu",
(uint) file, (ulong) filepos, block->status,
(uint) page_status));
#if !defined(DBUG_OFF) && defined(EXTRA_DEBUG)
DBUG_EXECUTE("check_keycache2",
......@@ -1604,6 +1644,10 @@ static void read_block(KEY_CACHE *keycache,
/* Page is not in buffer yet, is to be read from disk */
keycache_pthread_mutex_unlock(&keycache->cache_lock);
/*
Here other threads may step in and register as secondary readers.
They will register in block->wqueue[COND_FOR_REQUESTED].
*/
got_length= my_pread(block->hash_link->file, block->buffer,
read_length, block->hash_link->diskpos, MYF(0));
keycache_pthread_mutex_lock(&keycache->cache_lock);
......@@ -1634,6 +1678,8 @@ static void read_block(KEY_CACHE *keycache,
add_to_queue(&block->wqueue[COND_FOR_REQUESTED], thread);
do
{
KEYCACHE_DBUG_PRINT("read_block: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
}
......@@ -1855,6 +1901,10 @@ int key_cache_insert(KEY_CACHE *keycache,
/* The requested page is to be read into the block buffer */
#if !defined(SERIALIZED_READ_FROM_CACHE)
keycache_pthread_mutex_unlock(&keycache->cache_lock);
/*
Here other threads may step in and register as secondary readers.
They will register in block->wqueue[COND_FOR_REQUESTED].
*/
#endif
/* Copy data from buff */
......@@ -1865,9 +1915,15 @@ int key_cache_insert(KEY_CACHE *keycache,
#if !defined(SERIALIZED_READ_FROM_CACHE)
keycache_pthread_mutex_lock(&keycache->cache_lock);
/* Here we are alone again. */
#endif
block->status= BLOCK_READ;
block->length= read_length+offset;
KEYCACHE_DBUG_PRINT("key_cache_insert",
("primary request: new page in cache"));
/* Signal that all pending requests for this now can be processed. */
if (block->wqueue[COND_FOR_REQUESTED].last_thread)
release_queue(&block->wqueue[COND_FOR_REQUESTED]);
}
remove_reader(block);
......@@ -2074,9 +2130,16 @@ static void free_block(KEY_CACHE *keycache, BLOCK_LINK *block)
{
KEYCACHE_THREAD_TRACE("free block");
KEYCACHE_DBUG_PRINT("free_block",
("block %u to be freed",BLOCK_NUMBER(block)));
("block %u to be freed, hash_link %p",
BLOCK_NUMBER(block), block->hash_link));
if (block->hash_link)
{
/*
While waiting for readers to finish, new readers might request the
block. But since we set block->status|= BLOCK_REASSIGNED, they
will wait on block->wqueue[COND_FOR_SAVED]. They must be signalled
later.
*/
block->status|= BLOCK_REASSIGNED;
wait_for_readers(keycache, block);
unlink_hash(keycache, block->hash_link);
......@@ -2102,6 +2165,10 @@ static void free_block(KEY_CACHE *keycache, BLOCK_LINK *block)
keycache->free_block_list= block;
/* Keep track of the number of currently unused blocks. */
keycache->blocks_unused++;
/* All pending requests for this page must be resubmitted. */
if (block->wqueue[COND_FOR_SAVED].last_thread)
release_queue(&block->wqueue[COND_FOR_SAVED]);
}
......@@ -2334,6 +2401,8 @@ restart:
add_to_queue(&block->wqueue[COND_FOR_SAVED], thread);
do
{
KEYCACHE_DBUG_PRINT("flush_key_blocks_int: wait",
("suspend thread %ld", thread->id));
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
}
......@@ -2685,14 +2754,6 @@ static int keycache_pthread_cond_signal(pthread_cond_t *cond)
}
static int keycache_pthread_cond_broadcast(pthread_cond_t *cond)
{
int rc;
KEYCACHE_THREAD_TRACE("signal");
rc= pthread_cond_broadcast(cond);
return rc;
}
#if defined(KEYCACHE_DEBUG_LOG)
......
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