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Commit c90673de authored by joerg@mysql.com's avatar joerg@mysql.com
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Change "mf_keycache.c" so that it can be compiled without thread support (bug#11680): 

"configure --without-server"   (without giving "--enable-thread-safe-client").
parent 028e8926
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Showing with 70 additions and 2 deletions
mysys/mf_keycache.c
View file @ c90673de
......@@ -161,10 +161,12 @@ KEY_CACHE *dflt_key_cache= &dflt_key_cache_var;
#define FLUSH_CACHE 2000 /* sort this many blocks at once */
static int flush_all_key_blocks(KEY_CACHE *keycache);
#ifdef THREAD
static void link_into_queue(KEYCACHE_WQUEUE *wqueue,
struct st_my_thread_var *thread);
static void unlink_from_queue(KEYCACHE_WQUEUE *wqueue,
struct st_my_thread_var *thread);
#endif
static void free_block(KEY_CACHE *keycache, BLOCK_LINK *block);
static void test_key_cache(KEY_CACHE *keycache,
const char *where, my_bool lock);
......@@ -215,6 +217,7 @@ static void keycache_debug_print _VARARGS((const char *fmt,...));
#endif /* defined(KEYCACHE_DEBUG_LOG) && defined(KEYCACHE_DEBUG) */
#if defined(KEYCACHE_DEBUG) || !defined(DBUG_OFF)
#ifdef THREAD
static long keycache_thread_id;
#define KEYCACHE_THREAD_TRACE(l) \
KEYCACHE_DBUG_PRINT(l,("|thread %ld",keycache_thread_id))
......@@ -226,6 +229,11 @@ static long keycache_thread_id;
#define KEYCACHE_THREAD_TRACE_END(l) \
KEYCACHE_DBUG_PRINT(l,("]thread %ld",keycache_thread_id))
#else /* THREAD */
#define KEYCACHE_THREAD_TRACE(l) KEYCACHE_DBUG_PRINT(l,(""))
#define KEYCACHE_THREAD_TRACE_BEGIN(l) KEYCACHE_DBUG_PRINT(l,(""))
#define KEYCACHE_THREAD_TRACE_END(l) KEYCACHE_DBUG_PRINT(l,(""))
#endif /* THREAD */
#else
#define KEYCACHE_THREAD_TRACE_BEGIN(l)
#define KEYCACHE_THREAD_TRACE_END(l)
......@@ -492,6 +500,7 @@ int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
keycache_pthread_mutex_lock(&keycache->cache_lock);
#ifdef THREAD
wqueue= &keycache->resize_queue;
thread= my_thread_var;
link_into_queue(wqueue, thread);
......@@ -500,6 +509,7 @@ int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
{
keycache_pthread_cond_wait(&thread->suspend, &keycache->cache_lock);
}
#endif
keycache->resize_in_flush= 1;
if (flush_all_key_blocks(keycache))
......@@ -512,12 +522,16 @@ int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
}
keycache->resize_in_flush= 0;
keycache->can_be_used= 0;
#ifdef THREAD
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);
}
#else
KEYCACHE_DBUG_ASSERT(keycache->cnt_for_resize_op == 0);
#endif
end_key_cache(keycache, 0); /* Don't free mutex */
/* The following will work even if use_mem is 0 */
......@@ -525,6 +539,7 @@ int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
division_limit, age_threshold);
finish:
#ifdef THREAD
unlink_from_queue(wqueue, thread);
/* Signal for the next resize request to proceeed if any */
if (wqueue->last_thread)
......@@ -533,6 +548,7 @@ int resize_key_cache(KEY_CACHE *keycache, uint key_cache_block_size,
("thread %ld", wqueue->last_thread->next->id));
keycache_pthread_cond_signal(&wqueue->last_thread->next->suspend);
}
#endif
keycache_pthread_mutex_unlock(&keycache->cache_lock);
return blocks;
}
......@@ -553,6 +569,7 @@ static inline void inc_counter_for_resize_op(KEY_CACHE *keycache)
*/
static inline void dec_counter_for_resize_op(KEY_CACHE *keycache)
{
#ifdef THREAD
struct st_my_thread_var *last_thread;
if (!--keycache->cnt_for_resize_op &&
(last_thread= keycache->resize_queue.last_thread))
......@@ -561,6 +578,9 @@ static inline void dec_counter_for_resize_op(KEY_CACHE *keycache)
("thread %ld", last_thread->next->id));
keycache_pthread_cond_signal(&last_thread->next->suspend);
}
#else
keycache->cnt_for_resize_op--;
#endif
}
/*
......@@ -649,6 +669,7 @@ writes: %ld r_requests: %ld reads: %ld",
} /* end_key_cache */
#ifdef THREAD
/*
Link a thread into double-linked queue of waiting threads.
......@@ -785,6 +806,7 @@ static void release_queue(KEYCACHE_WQUEUE *wqueue)
while (thread != last);
wqueue->last_thread= NULL;
}
#endif
/*
......@@ -892,6 +914,7 @@ 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));
#ifdef THREAD
if (!hot && keycache->waiting_for_block.last_thread)
{
/* Signal that in the LRU warm sub-chain an available block has appeared */
......@@ -928,6 +951,10 @@ static void link_block(KEY_CACHE *keycache, BLOCK_LINK *block, my_bool hot,
#endif
return;
}
#else /* THREAD */
KEYCACHE_DBUG_ASSERT(! (!hot && keycache->waiting_for_block.last_thread));
/* Condition not transformed using DeMorgan, to keep the text identical */
#endif /* THREAD */
pins= hot ? &keycache->used_ins : &keycache->used_last;
ins= *pins;
if (ins)
......@@ -1100,6 +1127,7 @@ static inline void remove_reader(BLOCK_LINK *block)
static inline void wait_for_readers(KEY_CACHE *keycache, BLOCK_LINK *block)
{
#ifdef THREAD
struct st_my_thread_var *thread= my_thread_var;
while (block->hash_link->requests)
{
......@@ -1110,6 +1138,9 @@ static inline void wait_for_readers(KEY_CACHE *keycache, BLOCK_LINK *block)
keycache_pthread_cond_wait(&thread->suspend, &keycache->cache_lock);
block->condvar= NULL;
}
#else
KEYCACHE_DBUG_ASSERT(block->hash_link->requests == 0);
#endif
}
......@@ -1139,6 +1170,7 @@ static void unlink_hash(KEY_CACHE *keycache, HASH_LINK *hash_link)
if ((*hash_link->prev= hash_link->next))
hash_link->next->prev= hash_link->prev;
hash_link->block= NULL;
#ifdef THREAD
if (keycache->waiting_for_hash_link.last_thread)
{
/* Signal that a free hash link has appeared */
......@@ -1174,6 +1206,9 @@ static void unlink_hash(KEY_CACHE *keycache, HASH_LINK *hash_link)
hash_link);
return;
}
#else /* THREAD */
KEYCACHE_DBUG_ASSERT(! (keycache->waiting_for_hash_link.last_thread));
#endif /* THREAD */
hash_link->next= keycache->free_hash_list;
keycache->free_hash_list= hash_link;
}
......@@ -1239,6 +1274,7 @@ static HASH_LINK *get_hash_link(KEY_CACHE *keycache,
}
else
{
#ifdef THREAD
/* Wait for a free hash link */
struct st_my_thread_var *thread= my_thread_var;
KEYCACHE_DBUG_PRINT("get_hash_link", ("waiting"));
......@@ -1251,6 +1287,9 @@ static HASH_LINK *get_hash_link(KEY_CACHE *keycache,
keycache_pthread_cond_wait(&thread->suspend,
&keycache->cache_lock);
thread->opt_info= NULL;
#else
KEYCACHE_DBUG_ASSERT(0);
#endif
goto restart;
}
hash_link->file= file;
......@@ -1362,6 +1401,7 @@ static BLOCK_LINK *find_key_block(KEY_CACHE *keycache,
/* Wait intil the page is flushed on disk */
hash_link->requests--;
{
#ifdef THREAD
struct st_my_thread_var *thread= my_thread_var;
add_to_queue(&block->wqueue[COND_FOR_SAVED], thread);
do
......@@ -1372,6 +1412,16 @@ static BLOCK_LINK *find_key_block(KEY_CACHE *keycache,
&keycache->cache_lock);
}
while(thread->next);
#else
KEYCACHE_DBUG_ASSERT(0);
/*
Given the use of "resize_in_flush", it seems impossible
that this whole branch is ever entered in single-threaded case
because "(wrmode && keycache->resize_in_flush)" cannot be true.
TODO: Check this, and then put the whole branch into the
"#ifdef THREAD" guard.
*/
#endif
}
/* Invalidate page in the block if it has not been done yet */
if (block->status)
......@@ -1400,6 +1450,7 @@ static BLOCK_LINK *find_key_block(KEY_CACHE *keycache,
KEYCACHE_DBUG_PRINT("find_key_block",
("request waiting for old page to be saved"));
{
#ifdef THREAD
struct st_my_thread_var *thread= my_thread_var;
/* Put the request into the queue of those waiting for the old page */
add_to_queue(&block->wqueue[COND_FOR_SAVED], thread);
......@@ -1412,6 +1463,10 @@ static BLOCK_LINK *find_key_block(KEY_CACHE *keycache,
&keycache->cache_lock);
}
while(thread->next);
#else
KEYCACHE_DBUG_ASSERT(0);
/* No parallel requests in single-threaded case */
#endif
}
KEYCACHE_DBUG_PRINT("find_key_block",
("request for old page resubmitted"));
......@@ -1470,6 +1525,7 @@ static BLOCK_LINK *find_key_block(KEY_CACHE *keycache,
all of them must get the same block
*/
#ifdef THREAD
if (! keycache->used_last)
{
struct st_my_thread_var *thread= my_thread_var;
......@@ -1485,6 +1541,9 @@ static BLOCK_LINK *find_key_block(KEY_CACHE *keycache,
while (thread->next);
thread->opt_info= NULL;
}
#else
KEYCACHE_DBUG_ASSERT(keycache->used_last);
#endif
block= hash_link->block;
if (! block)
{
......@@ -1673,6 +1732,7 @@ static void read_block(KEY_CACHE *keycache,
KEYCACHE_DBUG_PRINT("read_block",
("secondary request waiting for new page to be read"));
{
#ifdef THREAD
struct st_my_thread_var *thread= my_thread_var;
/* Put the request into a queue and wait until it can be processed */
add_to_queue(&block->wqueue[COND_FOR_REQUESTED], thread);
......@@ -1684,6 +1744,10 @@ static void read_block(KEY_CACHE *keycache,
&keycache->cache_lock);
}
while (thread->next);
#else
KEYCACHE_DBUG_ASSERT(0);
/* No parallel requests in single-threaded case */
#endif
}
KEYCACHE_DBUG_PRINT("read_block",
("secondary request: new page in cache"));
......@@ -1821,7 +1885,7 @@ byte *key_cache_read(KEY_CACHE *keycache,
#ifndef THREAD
/* This is only true if we where able to read everything in one block */
if (return_buffer)
return (block->buffer);
DBUG_RETURN(block->buffer);
#endif
buff+= read_length;
filepos+= read_length+offset;
......@@ -2397,6 +2461,7 @@ static int flush_key_blocks_int(KEY_CACHE *keycache,
#endif
block= first_in_switch;
{
#ifdef THREAD
struct st_my_thread_var *thread= my_thread_var;
add_to_queue(&block->wqueue[COND_FOR_SAVED], thread);
do
......@@ -2407,6 +2472,10 @@ static int flush_key_blocks_int(KEY_CACHE *keycache,
&keycache->cache_lock);
}
while (thread->next);
#else
KEYCACHE_DBUG_ASSERT(0);
/* No parallel requests in single-threaded case */
#endif
}
#if defined(KEYCACHE_DEBUG)
cnt++;
......@@ -2573,7 +2642,6 @@ static void test_key_cache(KEY_CACHE *keycache __attribute__((unused)),
static void keycache_dump(KEY_CACHE *keycache)
{
FILE *keycache_dump_file=fopen(KEYCACHE_DUMP_FILE, "w");
struct st_my_thread_var *thread_var= my_thread_var;
struct st_my_thread_var *last;
struct st_my_thread_var *thread;
BLOCK_LINK *block;
......
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