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  • Committer: Brian Aker
  • Date: 2009-03-17 06:05:42 UTC
  • mfrom: (934.2.17 small-cleanups)
  • Revision ID: brian@tangent.org-20090317060542-a7ggj7l686cvxw31
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drizzled/xid.cc
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 */
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#include <drizzled/global.h>
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#include <stdint.h>
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#include <string.h>
 
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#include <mysys/hash.h>
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#include <drizzled/xid.h>
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XID::XID()
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{
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  return sizeof(gtrid_length)+sizeof(bqual_length)+gtrid_length+bqual_length;
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}
 
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/***************************************************************************
 
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  Handling of XA id cacheing
 
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***************************************************************************/
 
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pthread_mutex_t LOCK_xid_cache;
 
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HASH xid_cache;
 
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extern "C" unsigned char *xid_get_hash_key(const unsigned char *, size_t *, bool);
 
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extern "C" void xid_free_hash(void *);
 
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unsigned char *xid_get_hash_key(const unsigned char *ptr, size_t *length,
 
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                        bool )
 
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{
 
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  *length=((XID_STATE*)ptr)->xid.key_length();
 
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  return ((XID_STATE*)ptr)->xid.key();
 
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}
 
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void xid_free_hash(void *ptr)
 
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{
 
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  if (!((XID_STATE*)ptr)->in_session)
 
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    free((unsigned char*)ptr);
 
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}
 
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bool xid_cache_init()
 
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{
 
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  pthread_mutex_init(&LOCK_xid_cache, MY_MUTEX_INIT_FAST);
 
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  return hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
 
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                   xid_get_hash_key, xid_free_hash, 0) != 0;
 
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}
 
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void xid_cache_free()
 
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{
 
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  if (hash_inited(&xid_cache))
 
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  {
 
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    hash_free(&xid_cache);
 
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    pthread_mutex_destroy(&LOCK_xid_cache);
 
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  }
 
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}
 
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XID_STATE *xid_cache_search(XID *xid)
 
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{
 
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  pthread_mutex_lock(&LOCK_xid_cache);
 
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  XID_STATE *res=(XID_STATE *)hash_search(&xid_cache, xid->key(), xid->key_length());
 
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  pthread_mutex_unlock(&LOCK_xid_cache);
 
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  return res;
 
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}
 
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bool xid_cache_insert(XID *xid, enum xa_states xa_state)
 
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{
 
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  XID_STATE *xs;
 
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  bool res;
 
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  pthread_mutex_lock(&LOCK_xid_cache);
 
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  if (hash_search(&xid_cache, xid->key(), xid->key_length()))
 
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    res=0;
 
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  else if (!(xs=(XID_STATE *)malloc(sizeof(*xs))))
 
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    res=1;
 
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  else
 
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  {
 
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    xs->xa_state=xa_state;
 
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    xs->xid.set(xid);
 
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    xs->in_session=0;
 
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    res=my_hash_insert(&xid_cache, (unsigned char*)xs);
 
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  }
 
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  pthread_mutex_unlock(&LOCK_xid_cache);
 
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  return res;
 
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}
 
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bool xid_cache_insert(XID_STATE *xid_state)
 
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{
 
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  pthread_mutex_lock(&LOCK_xid_cache);
 
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  assert(hash_search(&xid_cache, xid_state->xid.key(),
 
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                          xid_state->xid.key_length())==0);
 
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  bool res=my_hash_insert(&xid_cache, (unsigned char*)xid_state);
 
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  pthread_mutex_unlock(&LOCK_xid_cache);
 
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  return res;
 
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}
 
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void xid_cache_delete(XID_STATE *xid_state)
 
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{
 
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  pthread_mutex_lock(&LOCK_xid_cache);
 
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  hash_delete(&xid_cache, (unsigned char *)xid_state);
 
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  pthread_mutex_unlock(&LOCK_xid_cache);
 
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}