Backported my_atomic from 6.0-codebase and added support for 64-bit atomics to enable removal of LOCK_thread_count from every query, removed LOCK_thread_count from use in dispatch_command and close of query which is used in every query, now uses atomic increments/decrements instead

include/Makefile.am

@@ -38,7 +38,7 @@ noinst_HEADERS =	config-win.h config-netware.h my_bit.h \
 			thr_lock.h t_ctype.h violite.h my_md5.h base64.h \
 			my_handler.h my_time.h \
 			my_vle.h my_user.h my_atomic.h atomic/nolock.h \
-			atomic/rwlock.h atomic/x86-gcc.h atomic/x86-msvc.h \
+			atomic/rwlock.h atomic/x86-gcc.h atomic/generic-msvc.h \
                         atomic/solaris.h \
 			atomic/gcc_builtins.h my_libwrap.h my_stacktrace.h
 

include/atomic/rwlock.h

@@ -1,3 +1,6 @@
+#ifndef ATOMIC_RWLOCK_INCLUDED
+#define ATOMIC_RWLOCK_INCLUDED
+
 /* Copyright (C) 2006 MySQL AB
 
    This program is free software; you can redistribute it and/or modify
@@ -13,7 +16,8 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
-typedef struct {pthread_rwlock_t rw;} my_atomic_rwlock_t;
+typedef struct {pthread_mutex_t rw;} my_atomic_rwlock_t;
+#define MY_ATOMIC_MODE_RWLOCKS 1
 
 #ifdef MY_ATOMIC_MODE_DUMMY
 /*
@@ -31,18 +35,27 @@ typedef struct {pthread_rwlock_t rw;} my_atomic_rwlock_t;
 #define my_atomic_rwlock_wrunlock(name)
 #define MY_ATOMIC_MODE "dummy (non-atomic)"
 #else
-#define my_atomic_rwlock_destroy(name)     pthread_rwlock_destroy(& (name)->rw)
+/*
-#define my_atomic_rwlock_init(name)        pthread_rwlock_init(& (name)->rw, 0)
+  we're using read-write lock macros but map them to mutex locks, and they're
-#define my_atomic_rwlock_rdlock(name)      pthread_rwlock_rdlock(& (name)->rw)
+  faster. Still, having semantically rich API we can change the
-#define my_atomic_rwlock_wrlock(name)      pthread_rwlock_wrlock(& (name)->rw)
+  underlying implementation, if necessary.
-#define my_atomic_rwlock_rdunlock(name)    pthread_rwlock_unlock(& (name)->rw)
+*/
-#define my_atomic_rwlock_wrunlock(name)    pthread_rwlock_unlock(& (name)->rw)
+#define my_atomic_rwlock_destroy(name)     pthread_mutex_destroy(& (name)->rw)
-#define MY_ATOMIC_MODE "rwlocks"
+#define my_atomic_rwlock_init(name)        pthread_mutex_init(& (name)->rw, 0)
+#define my_atomic_rwlock_rdlock(name)      pthread_mutex_lock(& (name)->rw)
+#define my_atomic_rwlock_wrlock(name)      pthread_mutex_lock(& (name)->rw)
+#define my_atomic_rwlock_rdunlock(name)    pthread_mutex_unlock(& (name)->rw)
+#define my_atomic_rwlock_wrunlock(name)    pthread_mutex_unlock(& (name)->rw)
+#define MY_ATOMIC_MODE "mutex"
+#ifndef MY_ATOMIC_MODE_RWLOCKS
+#define MY_ATOMIC_MODE_RWLOCKS 1
+#endif
 #endif
 
 #define make_atomic_add_body(S)     int ## S sav; sav= *a; *a+= v; v=sav;
-#define make_atomic_swap_body(S)    int ## S sav; sav= *a; *a= v; v=sav;
+#define make_atomic_fas_body(S)     int ## S sav; sav= *a; *a= v; v=sav;
 #define make_atomic_cas_body(S)     if ((ret= (*a == *cmp))) *a= set; else *cmp=*a;
 #define make_atomic_load_body(S)    ret= *a;
 #define make_atomic_store_body(S)   *a= v;
 
+#endif /* ATOMIC_RWLOCK_INCLUDED */

include/atomic/x86-gcc.h

@@ -42,15 +42,37 @@
 #endif
 
 #ifndef MY_ATOMIC_NO_XADD
-#define make_atomic_add_body(S)					\
+#define make_atomic_add_body(S)         make_atomic_add_body ## S
-  asm volatile (LOCK_prefix "; xadd %0, %1;" : "+r" (v) , "+m" (*a))
+#define make_atomic_cas_body(S)         make_atomic_cas_body ## S
 #endif
-#define make_atomic_fas_body(S)				\
+
-  asm volatile ("xchg %0, %1;" : "+q" (v) , "+m" (*a))
+#define make_atomic_add_body32                                  \
-#define make_atomic_cas_body(S)					\
+  asm volatile (LOCK_prefix "; xadd %0, %1;" : "+r" (v) , "+m" (*a))
+
+#define make_atomic_cas_body32                                  \
   asm volatile (LOCK_prefix "; cmpxchg %3, %0; setz %2;"	\
                : "+m" (*a), "+a" (*cmp), "=q" (ret): "r" (set))
 
+#define make_atomic_cas_bodyptr make_atomic_cas_body32
+
+#ifndef __x86_64__
+#define make_atomic_add_body64 make_atomic_add_body32
+#define make_atomic_cas_body64 make_atomic_cas_body32
+#else
+#define make_atomic_add_body64                                  \
+  int64 tmp=*a;                                                 \
+  while (!my_atomic_cas64(a, &tmp, tmp+v));                     \
+  v=tmp;
+#define make_atomic_cas_body64                                  \
+  int32 ebx=(set & 0xFFFFFFFF), ecx=(set >> 32);                \
+  asm volatile (LOCK_prefix "; cmpxchg8b %0; setz %2;"         \
+               : "+m" (*a), "+A" (*cmp), "=q" (ret)             \
+               :"b" (ebx), "c" (ecx))
+#endif
+
+#define make_atomic_fas_body(S)                                        \
+  asm volatile ("xchg %0, %1;" : "+r" (v) , "+m" (*a))
+
 #ifdef MY_ATOMIC_MODE_DUMMY
 #define make_atomic_load_body(S)   ret=*a
 #define make_atomic_store_body(S)  *a=v

include/my_atomic.h

@@ -37,7 +37,7 @@
   my_atomic_store#(&var, what)
     store 'what' in *var
 
-  '#' is substituted by a size suffix - 8, 16, 32, or ptr
+  '#' is substituted by a size suffix - 8, 16, 32, 64, or ptr
   (e.g. my_atomic_add8, my_atomic_fas32, my_atomic_casptr).
 
   NOTE This operations are not always atomic, so they always must be
@@ -129,6 +129,7 @@
 make_transparent_unions(8)
 make_transparent_unions(16)
 make_transparent_unions(32)
+make_transparent_unions(64)
 make_transparent_unions(ptr)
 #undef uintptr
 #undef make_transparent_unions
@@ -140,10 +141,12 @@ make_transparent_unions(ptr)
 #define U_8    int8
 #define U_16   int16
 #define U_32   int32
+#define U_64   int64
 #define U_ptr  intptr
 #define Uv_8   int8
 #define Uv_16  int16
 #define Uv_32  int32
+#define Uv_64  int64
 #define Uv_ptr intptr
 #define U_a    volatile *a
 #define U_cmp  *cmp
@@ -217,6 +220,7 @@ make_atomic_cas(8)
 make_atomic_cas(16)
 #endif
 make_atomic_cas(32)
+make_atomic_cas(64)
 make_atomic_cas(ptr)
 
 #ifdef MY_ATOMIC_HAS_8_16
@@ -224,12 +228,14 @@ make_atomic_add(8)
 make_atomic_add(16)
 #endif
 make_atomic_add(32)
+make_atomic_add(64)
 
 #ifdef MY_ATOMIC_HAS_8_16
 make_atomic_load(8)
 make_atomic_load(16)
 #endif
 make_atomic_load(32)
+make_atomic_load(64)
 make_atomic_load(ptr)
 
 #ifdef MY_ATOMIC_HAS_8_16
@@ -237,6 +243,7 @@ make_atomic_fas(8)
 make_atomic_fas(16)
 #endif
 make_atomic_fas(32)
+make_atomic_fas(64)
 make_atomic_fas(ptr)
 
 #ifdef MY_ATOMIC_HAS_8_16
@@ -244,6 +251,7 @@ make_atomic_store(8)
 make_atomic_store(16)
 #endif
 make_atomic_store(32)
+make_atomic_store(64)
 make_atomic_store(ptr)
 
 #ifdef _atomic_h_cleanup_
@@ -254,10 +262,12 @@ make_atomic_store(ptr)
 #undef U_8
 #undef U_16
 #undef U_32
+#undef U_64
 #undef U_ptr
 #undef Uv_8
 #undef Uv_16
 #undef Uv_32
+#undef Uv_64
 #undef Uv_ptr
 #undef a
 #undef cmp

include/my_global.h

@@ -832,6 +832,8 @@ typedef SOCKET_SIZE_TYPE size_socket;
 #endif
 #endif /* defined (HAVE_LONG_LONG) && !defined(ULONGLONG_MAX)*/
 
+#define INT_MIN64       (~0x7FFFFFFFFFFFFFFFLL)
+#define INT_MAX64       0x7FFFFFFFFFFFFFFFLL
 #define INT_MIN32       (~0x7FFFFFFFL)
 #define INT_MAX32       0x7FFFFFFFL
 #define UINT_MAX32      0xFFFFFFFFL

sql/event_scheduler.cc

@@ -132,9 +132,10 @@ post_init_event_thread(THD *thd)
   pthread_mutex_lock(&LOCK_thread_count);
   threads.append(thd);
   thread_count++;
-  thread_running++;
   pthread_mutex_unlock(&LOCK_thread_count);
-
+  my_atomic_rwlock_wrlock(&global_query_id_lock);
+  inc_thread_running();
+  my_atomic_rwlock_wrunlock(&global_query_id_lock);
   return FALSE;
 }
 
@@ -156,10 +157,12 @@ deinit_event_thread(THD *thd)
   DBUG_PRINT("exit", ("Event thread finishing"));
   pthread_mutex_lock(&LOCK_thread_count);
   thread_count--;
-  thread_running--;
   delete thd;
   pthread_cond_broadcast(&COND_thread_count);
   pthread_mutex_unlock(&LOCK_thread_count);
+  my_atomic_rwlock_wrlock(&global_query_id_lock);
+  dec_thread_running();
+  my_atomic_rwlock_wrunlock(&global_query_id_lock);
 }
 
 
@@ -417,10 +420,12 @@ Event_scheduler::start()
     net_end(&new_thd->net);
     pthread_mutex_lock(&LOCK_thread_count);
     thread_count--;
-    thread_running--;
     delete new_thd;
     pthread_cond_broadcast(&COND_thread_count);
     pthread_mutex_unlock(&LOCK_thread_count);
+    my_atomic_rwlock_wrlock(&global_query_id_lock);
+    dec_thread_running();
+    my_atomic_rwlock_wrunlock(&global_query_id_lock);
   }
 end:
   UNLOCK_DATA();
@@ -550,10 +555,12 @@ error:
     net_end(&new_thd->net);
     pthread_mutex_lock(&LOCK_thread_count);
     thread_count--;
-    thread_running--;
     delete new_thd;
     pthread_cond_broadcast(&COND_thread_count);
     pthread_mutex_unlock(&LOCK_thread_count);
+    my_atomic_rwlock_wrlock(&global_query_id_lock);
+    dec_thread_running();
+    my_atomic_rwlock_wrunlock(&global_query_id_lock);
   }
   delete event_name;
   DBUG_RETURN(TRUE);

sql/log_event.cc

@@ -3026,9 +3026,9 @@ int Query_log_event::do_apply_event(Relay_log_info const *rli,
   {
     thd->set_time((time_t)when);
     thd->set_query((char*)query_arg, q_len_arg);
-    VOID(pthread_mutex_lock(&LOCK_thread_count));
+    my_atomic_rwlock_wrlock(&global_query_id_lock);
     thd->query_id = next_query_id();
-    VOID(pthread_mutex_unlock(&LOCK_thread_count));
+    my_atomic_rwlock_wrunlock(&global_query_id_lock);
     thd->variables.pseudo_thread_id= thread_id;		// for temp tables
     DBUG_PRINT("query",("%s",thd->query));
 
@@ -4504,9 +4504,9 @@ int Load_log_event::do_apply_event(NET* net, Relay_log_info const *rli,
   if (rpl_filter->db_ok(thd->db))
   {
     thd->set_time((time_t)when);
-    VOID(pthread_mutex_lock(&LOCK_thread_count));
+    my_atomic_rwlock_wrlock(&global_query_id_lock);
     thd->query_id = next_query_id();
-    VOID(pthread_mutex_unlock(&LOCK_thread_count));
+    my_atomic_rwlock_wrunlock(&global_query_id_lock);
     /*
       Initing thd->row_count is not necessary in theory as this variable has no
       influence in the case of the slave SQL thread (it is used to generate a
@@ -8025,9 +8025,9 @@ int Table_map_log_event::do_apply_event(Relay_log_info const *rli)
   DBUG_ASSERT(rli->sql_thd == thd);
 
   /* Step the query id to mark what columns that are actually used. */
-  pthread_mutex_lock(&LOCK_thread_count);
+  my_atomic_rwlock_wrlock(&global_query_id_lock);
   thd->query_id= next_query_id();
-  pthread_mutex_unlock(&LOCK_thread_count);
+  my_atomic_rwlock_wrunlock(&global_query_id_lock);
 
   if (!(memory= my_multi_malloc(MYF(MY_WME),
                                 &table_list, (uint) sizeof(RPL_TABLE_LIST),

sql/mysql_priv.h

@@ -43,6 +43,7 @@
 #include "sql_array.h"
 #include "sql_plugin.h"
 #include "scheduler.h"
+#include <my_atomic.h>
 
 class Parser_state;
 
@@ -75,11 +76,49 @@ typedef ulong nesting_map;  /* Used for flags of nesting constructs */
 typedef ulonglong nested_join_map;
 
 /* query_id */
-typedef ulonglong query_id_t;
+typedef int64 query_id_t;
 extern query_id_t global_query_id;
+extern int32 thread_running;
+extern my_atomic_rwlock_t global_query_id_lock;
 
 /* increment query_id and return it.  */
-inline query_id_t next_query_id() { return global_query_id++; }
+inline query_id_t next_query_id()
+{
+  query_id_t id;
+  id= my_atomic_add64(&global_query_id, 1);
+  return (id+1);
+}
+
+inline query_id_t get_query_id()
+{
+  query_id_t id;
+  id= my_atomic_load64(&global_query_id);
+  return id;
+}
+
+inline int32
+inc_thread_running()
+{
+  int32 num_thread_running;
+  num_thread_running= my_atomic_add32(&thread_running, 1);
+  return (num_thread_running+1);
+}
+
+inline int32
+dec_thread_running()
+{
+  int32 num_thread_running;
+  num_thread_running= my_atomic_add32(&thread_running, -1);
+  return (num_thread_running-1);
+}
+
+inline int32
+get_thread_running()
+{
+  int32 num_thread_running;
+  num_thread_running= my_atomic_load32(&thread_running);
+  return num_thread_running;
+}
 
 /* useful constants */
 extern MYSQL_PLUGIN_IMPORT const key_map key_map_empty;
@@ -1994,7 +2033,7 @@ extern bool opt_ignore_builtin_innodb;
 extern my_bool opt_character_set_client_handshake;
 extern bool volatile abort_loop, shutdown_in_progress;
 extern bool in_bootstrap;
-extern uint volatile thread_count, thread_running, global_read_lock;
+extern uint volatile thread_count, global_read_lock;
 extern uint connection_count;
 extern my_bool opt_sql_bin_update, opt_safe_user_create, opt_no_mix_types;
 extern my_bool opt_safe_show_db, opt_local_infile, opt_myisam_use_mmap;

sql/mysqld.cc

@@ -523,7 +523,8 @@ uint mysqld_port_timeout;
 uint delay_key_write_options, protocol_version;
 uint lower_case_table_names;
 uint tc_heuristic_recover= 0;
-uint volatile thread_count, thread_running;
+uint volatile thread_count;
+int32 thread_running;
 ulonglong thd_startup_options;
 ulong back_log, connect_timeout, concurrency, server_id;
 ulong table_cache_size, table_def_size;
@@ -539,6 +540,7 @@ ulonglong  max_binlog_cache_size=0;
 ulong query_cache_size=0;
 ulong refresh_version;  /* Increments on each reload */
 query_id_t global_query_id;
+my_atomic_rwlock_t global_query_id_lock;
 ulong aborted_threads, aborted_connects;
 ulong delayed_insert_timeout, delayed_insert_limit, delayed_queue_size;
 ulong delayed_insert_threads, delayed_insert_writes, delayed_rows_in_use;
@@ -1349,6 +1351,7 @@ void clean_up(bool print_message)
   DBUG_PRINT("quit", ("Error messages freed"));
   /* Tell main we are ready */
   logger.cleanup_end();
+  my_atomic_rwlock_destroy(&global_query_id_lock);
   (void) pthread_mutex_lock(&LOCK_thread_count);
   DBUG_PRINT("quit", ("got thread count lock"));
   ready_to_exit=1;
@@ -7730,6 +7733,7 @@ static int mysql_init_variables(void)
   what_to_log= ~ (1L << (uint) COM_TIME);
   refresh_version= 1L;	/* Increments on each reload */
   global_query_id= thread_id= 1L;
+  my_atomic_rwlock_init(&global_query_id_lock);
   strmov(server_version, MYSQL_SERVER_VERSION);
   myisam_recover_options_str= sql_mode_str= "OFF";
   myisam_stats_method_str= "nulls_unequal";

sql/sp_head.cc

@@ -2702,9 +2702,9 @@ sp_lex_keeper::reset_lex_and_exec_core(THD *thd, uint *nextp,
   */
   thd->lex= m_lex;
 
-  VOID(pthread_mutex_lock(&LOCK_thread_count));
+  my_atomic_rwlock_wrlock(&global_query_id_lock);
   thd->query_id= next_query_id();
-  VOID(pthread_mutex_unlock(&LOCK_thread_count));
+  my_atomic_rwlock_wrunlock(&global_query_id_lock);
 
   if (thd->prelocked_mode == NON_PRELOCKED)
   {

sql/sql_parse.cc

@@ -505,7 +505,9 @@ pthread_handler_t handle_bootstrap(void *arg)
       We don't need to obtain LOCK_thread_count here because in bootstrap
       mode we have only one thread.
     */
+    my_atomic_rwlock_wrlock(&global_query_id_lock);
     thd->query_id=next_query_id();
+    my_atomic_rwlock_wrunlock(&global_query_id_lock);
     thd->set_time();
     mysql_parse(thd, thd->query, length, & found_semicolon);
     close_thread_tables(thd);			// Free tables
@@ -971,29 +973,30 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   thd->enable_slow_log= TRUE;
   thd->lex->sql_command= SQLCOM_END; /* to avoid confusing VIEW detectors */
   thd->set_time();
-  VOID(pthread_mutex_lock(&LOCK_thread_count));
+  my_atomic_rwlock_wrlock(&global_query_id_lock);
-  thd->query_id= global_query_id;
+  {
-
+    query_id_t query_id;
-  switch( command ) {
+    switch( command ) {
-  /* Ignore these statements. */
+    /* Ignore these statements. */
-  case COM_STATISTICS:
+    case COM_STATISTICS:
-  case COM_PING:
+    case COM_PING:
-    break;
+      query_id= get_query_id();
-  /* Only increase id on these statements but don't count them. */
+      break;
-  case COM_STMT_PREPARE: 
+    /* Only increase id on these statements but don't count them. */
-  case COM_STMT_CLOSE:
+    case COM_STMT_PREPARE: 
-  case COM_STMT_RESET:
+    case COM_STMT_CLOSE:
-    next_query_id();
+    case COM_STMT_RESET:
-    break;
+      query_id= next_query_id() - 1;
-  /* Increase id and count all other statements. */
+      break;
-  default:
+    /* Increase id and count all other statements. */
-    statistic_increment(thd->status_var.questions, &LOCK_status);
+    default:
-    next_query_id();
+      statistic_increment(thd->status_var.questions, &LOCK_status);
+      query_id= next_query_id() - 1;
+    }
+    thd->query_id= query_id;
   }
-
+  inc_thread_running();
-  thread_running++;
+  my_atomic_rwlock_wrunlock(&global_query_id_lock);
-  /* TODO: set thd->lex->sql_command to SQLCOM_END here */
-  VOID(pthread_mutex_unlock(&LOCK_thread_count));
 
   /**
     Clear the set of flags that are expected to be cleared at the
@@ -1259,15 +1262,15 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
                         (char *) thd->security_ctx->host_or_ip);
 
       thd->set_query(beginning_of_next_stmt, length);
-      VOID(pthread_mutex_lock(&LOCK_thread_count));
       /*
         Count each statement from the client.
       */
       statistic_increment(thd->status_var.questions, &LOCK_status);
+      my_atomic_rwlock_wrlock(&global_query_id_lock);
       thd->query_id= next_query_id();
+      my_atomic_rwlock_wrunlock(&global_query_id_lock);
       thd->set_time(); /* Reset the query start time. */
       /* TODO: set thd->lex->sql_command to SQLCOM_END here */
-      VOID(pthread_mutex_unlock(&LOCK_thread_count));
       mysql_parse(thd, beginning_of_next_stmt, length, &end_of_stmt);
     }
 
@@ -1610,9 +1613,9 @@ bool dispatch_command(enum enum_server_command command, THD *thd,
   thd_proc_info(thd, "cleaning up");
   thd->set_query(NULL, 0);
   thd->command=COM_SLEEP;
-  VOID(pthread_mutex_lock(&LOCK_thread_count)); // For process list
+  my_atomic_rwlock_wrlock(&global_query_id_lock);
-  thread_running--;
+  dec_thread_running();
-  VOID(pthread_mutex_unlock(&LOCK_thread_count));
+  my_atomic_rwlock_wrunlock(&global_query_id_lock);
   thd_proc_info(thd, 0);
   thd->packet.shrink(thd->variables.net_buffer_length);	// Reclaim some memory
   free_root(thd->mem_root,MYF(MY_KEEP_PREALLOC));

unittest/mysys/my_atomic-t.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 2006 MySQL AB
+/* Copyright (C) 2006-2008 MySQL AB, 2008 Sun Microsystems, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -13,10 +13,7 @@
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
-#include <my_global.h>
+#include "thr_template.c"
-#include <my_sys.h>
-#include <my_atomic.h>
-#include <tap.h>
 
 /* at least gcc 3.4.5 and 3.4.6 (but not 3.2.3) on RHEL */
 #if __GNUC__ == 3 && __GNUC_MINOR__ == 4
@@ -25,181 +22,162 @@
 #define GCC_BUG_WORKAROUND
 #endif
 
-int32 a32,b32,c32;
+volatile uint32 b32;
+volatile int32  c32;
 my_atomic_rwlock_t rwl;
 
-pthread_attr_t thr_attr;
-pthread_mutex_t mutex;
-pthread_cond_t cond;
-int N;
-
 /* add and sub a random number in a loop. Must get 0 at the end */
-pthread_handler_t test_atomic_add_handler(void *arg)
+pthread_handler_t test_atomic_add(void *arg)
 {
-  int    m=*(int *)arg;
+  int    m= (*(int *)arg)/2;
   GCC_BUG_WORKAROUND int32 x;
-  for (x=((int)((long)(&m))); m ; m--)
+  for (x= ((int)(intptr)(&m)); m ; m--)
   {
-    x=x*m+0x87654321;
+    x= (x*m+0x87654321) & INT_MAX32;
     my_atomic_rwlock_wrlock(&rwl);
-    my_atomic_add32(&a32, x);
+    my_atomic_add32(&bad, x);
     my_atomic_rwlock_wrunlock(&rwl);
 
     my_atomic_rwlock_wrlock(&rwl);
-    my_atomic_add32(&a32, -x);
+    my_atomic_add32(&bad, -x);
     my_atomic_rwlock_wrunlock(&rwl);
   }
   pthread_mutex_lock(&mutex);
-  N--;
+  if (!--running_threads) pthread_cond_signal(&cond);
-  if (!N) pthread_cond_signal(&cond);
   pthread_mutex_unlock(&mutex);
   return 0;
 }
 
+volatile int64 a64;
+/* add and sub a random number in a loop. Must get 0 at the end */
+pthread_handler_t test_atomic_add64(void *arg)
+{
+  int    m= (*(int *)arg)/2;
+  GCC_BUG_WORKAROUND int64 x;
+  for (x= ((int64)(intptr)(&m)); m ; m--)
+  {
+    x= (x*m+0xfdecba987654321LL) & INT_MAX64;
+    my_atomic_rwlock_wrlock(&rwl);
+    my_atomic_add64(&a64, x);
+    my_atomic_rwlock_wrunlock(&rwl);
+
+    my_atomic_rwlock_wrlock(&rwl);
+    my_atomic_add64(&a64, -x);
+    my_atomic_rwlock_wrunlock(&rwl);
+  }
+  pthread_mutex_lock(&mutex);
+  if (!--running_threads)
+  {
+    bad= (a64 != 0);
+    pthread_cond_signal(&cond);
+  }
+  pthread_mutex_unlock(&mutex);
+  return 0;
+}
+
+
 /*
   1. generate thread number 0..N-1 from b32
-  2. add it to a32
+  2. add it to bad
   3. swap thread numbers in c32
   4. (optionally) one more swap to avoid 0 as a result
-  5. subtract result from a32
+  5. subtract result from bad
-  must get 0 in a32 at the end
+  must get 0 in bad at the end
 */
-pthread_handler_t test_atomic_swap_handler(void *arg)
+pthread_handler_t test_atomic_fas(void *arg)
 {
-  int    m=*(int *)arg;
+  int    m= *(int *)arg;
-  int32 x;
+  int32  x;
 
   my_atomic_rwlock_wrlock(&rwl);
-  x=my_atomic_add32(&b32, 1);
+  x= my_atomic_add32(&b32, 1);
   my_atomic_rwlock_wrunlock(&rwl);
 
   my_atomic_rwlock_wrlock(&rwl);
-  my_atomic_add32(&a32, x);
+  my_atomic_add32(&bad, x);
   my_atomic_rwlock_wrunlock(&rwl);
 
   for (; m ; m--)
   {
     my_atomic_rwlock_wrlock(&rwl);
-    x=my_atomic_swap32(&c32, x);
+    x= my_atomic_fas32(&c32, x);
     my_atomic_rwlock_wrunlock(&rwl);
   }
 
   if (!x)
   {
     my_atomic_rwlock_wrlock(&rwl);
-    x=my_atomic_swap32(&c32, x);
+    x= my_atomic_fas32(&c32, x);
     my_atomic_rwlock_wrunlock(&rwl);
   }
 
   my_atomic_rwlock_wrlock(&rwl);
-  my_atomic_add32(&a32, -x);
+  my_atomic_add32(&bad, -x);
   my_atomic_rwlock_wrunlock(&rwl);
 
   pthread_mutex_lock(&mutex);
-  N--;
+  if (!--running_threads) pthread_cond_signal(&cond);
-  if (!N) pthread_cond_signal(&cond);
   pthread_mutex_unlock(&mutex);
   return 0;
 }
 
 /*
-  same as test_atomic_add_handler, but my_atomic_add32 is emulated with
+  same as test_atomic_add, but my_atomic_add32 is emulated with
-  (slower) my_atomic_cas32
+  my_atomic_cas32 - notice that the slowdown is proportional to the
+  number of CPUs
 */
-pthread_handler_t test_atomic_cas_handler(void *arg)
+pthread_handler_t test_atomic_cas(void *arg)
 {
-  int    m=*(int *)arg, ok;
+  int    m= (*(int *)arg)/2, ok= 0;
-  GCC_BUG_WORKAROUND int32 x,y;
+  GCC_BUG_WORKAROUND int32 x, y;
-  for (x=((int)((long)(&m))); m ; m--)
+  for (x= ((int)(intptr)(&m)); m ; m--)
   {
     my_atomic_rwlock_wrlock(&rwl);
-    y=my_atomic_load32(&a32);
+    y= my_atomic_load32(&bad);
     my_atomic_rwlock_wrunlock(&rwl);
-
+    x= (x*m+0x87654321) & INT_MAX32;
-    x=x*m+0x87654321;
     do {
       my_atomic_rwlock_wrlock(&rwl);
-      ok=my_atomic_cas32(&a32, &y, y+x);
+      ok= my_atomic_cas32(&bad, &y, (uint32)y+x);
       my_atomic_rwlock_wrunlock(&rwl);
-    } while (!ok);
+    } while (!ok) ;
     do {
       my_atomic_rwlock_wrlock(&rwl);
-      ok=my_atomic_cas32(&a32, &y, y-x);
+      ok= my_atomic_cas32(&bad, &y, y-x);
       my_atomic_rwlock_wrunlock(&rwl);
-    } while (!ok);
+    } while (!ok) ;
   }
   pthread_mutex_lock(&mutex);
-  N--;
+  if (!--running_threads) pthread_cond_signal(&cond);
-  if (!N) pthread_cond_signal(&cond);
   pthread_mutex_unlock(&mutex);
   return 0;
 }
 
-void test_atomic(const char *test, pthread_handler handler, int n, int m)
+
+void do_tests()
 {
-  pthread_t t;
+  plan(6);
-  ulonglong now=my_getsystime();
 
-  a32= 0;
+  bad= my_atomic_initialize();
-  b32= 0;
+  ok(!bad, "my_atomic_initialize() returned %d", bad);
-  c32= 0;
 
-  diag("Testing %s with %d threads, %d iterations... ", test, n, m);
-  for (N=n ; n ; n--)
-  {
-    if (pthread_create(&t, &thr_attr, handler, &m) != 0)
-    {
-      diag("Could not create thread");
-      a32= 1;
-      goto err;
-    }
-  }
-
-  pthread_mutex_lock(&mutex);
-  while (N)
-    pthread_cond_wait(&cond, &mutex);
-  pthread_mutex_unlock(&mutex);
-  now=my_getsystime()-now;
-err:
-  ok(a32 == 0, "tested %s in %g secs", test, ((double)now)/1e7);
-}
-
-int main()
-{
-  int err;
-  MY_INIT("my_atomic-t.c");
-
-  diag("N CPUs: %d", my_getncpus());
-  err= my_atomic_initialize();
-
-  plan(4);
-  ok(err == 0, "my_atomic_initialize() returned %d", err);
-
-  pthread_attr_init(&thr_attr);
-  pthread_attr_setdetachstate(&thr_attr,PTHREAD_CREATE_DETACHED);
-  pthread_mutex_init(&mutex, 0);
-  pthread_cond_init(&cond, 0);
   my_atomic_rwlock_init(&rwl);
 
-#ifdef HPUX11
+  b32= c32= 0;
-#define CYCLES 1000
+  test_concurrently("my_atomic_add32", test_atomic_add, THREADS, CYCLES);
-#else
+  b32= c32= 0;
-#define CYCLES 10000
+  test_concurrently("my_atomic_fas32", test_atomic_fas, THREADS, CYCLES);
-#endif
+  b32= c32= 0;
-#define THREADS 100
+  test_concurrently("my_atomic_cas32", test_atomic_cas, THREADS, CYCLES);
-  test_atomic("my_atomic_add32", test_atomic_add_handler, THREADS, CYCLES);
+
-  test_atomic("my_atomic_swap32", test_atomic_swap_handler, THREADS, CYCLES);
+  {
-  test_atomic("my_atomic_cas32", test_atomic_cas_handler, THREADS, CYCLES);
+    int64 b=0x1000200030004000LL;
-  /*
+    a64=0;
-    workaround until we know why it crashes randomly on some machine
+    my_atomic_add64(&a64, b);
-    (BUG#22320).
+    ok(a64==b, "add64");
-  */
+  }
-  sleep(2);
+  a64=0;
+  test_concurrently("my_atomic_add64", test_atomic_add64, THREADS, CYCLES);
 
-  pthread_mutex_destroy(&mutex);
-  pthread_cond_destroy(&cond);
-  pthread_attr_destroy(&thr_attr);
   my_atomic_rwlock_destroy(&rwl);
-  return exit_status();
 }
-

unittest/mysys/thr_template.c

@@ -0,0 +1,92 @@
+/* Copyright (C) 2006-2008 MySQL AB, 2008 Sun Microsystems, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
+
+#include <my_global.h>
+#include <my_sys.h>
+#include <my_atomic.h>
+#include <tap.h>
+
+volatile uint32 bad;
+pthread_attr_t thr_attr;
+pthread_mutex_t mutex;
+pthread_cond_t cond;
+uint running_threads;
+
+void do_tests();
+
+void test_concurrently(const char *test, pthread_handler handler, int n, int m)
+{
+  pthread_t t;
+  ulonglong now= my_getsystime();
+
+  bad= 0;
+
+  diag("Testing %s with %d threads, %d iterations... ", test, n, m);
+  for (running_threads= n ; n ; n--)
+  {
+    if (pthread_create(&t, &thr_attr, handler, &m) != 0)
+    {
+      diag("Could not create thread");
+      abort();
+    }
+  }
+  pthread_mutex_lock(&mutex);
+  while (running_threads)
+    pthread_cond_wait(&cond, &mutex);
+  pthread_mutex_unlock(&mutex);
+
+  now= my_getsystime()-now;
+  ok(!bad, "tested %s in %g secs (%d)", test, ((double)now)/1e7, bad);
+}
+
+int main(int argc __attribute__((unused)), char **argv)
+{
+  MY_INIT("thd_template");
+
+  if (argv[1] && *argv[1])
+    DBUG_SET_INITIAL(argv[1]);
+
+  pthread_mutex_init(&mutex, 0);
+  pthread_cond_init(&cond, 0);
+  pthread_attr_init(&thr_attr);
+  pthread_attr_setdetachstate(&thr_attr,PTHREAD_CREATE_DETACHED);
+
+#ifdef MY_ATOMIC_MODE_RWLOCKS
+#if defined(HPUX11) || defined(__POWERPC__) /* showed to be very slow (scheduler-related) */
+#define CYCLES 300
+#else
+#define CYCLES 3000
+#endif
+#else
+#define CYCLES 3000
+#endif
+#define THREADS 30
+
+  diag("N CPUs: %d, atomic ops: %s", my_getncpus(), MY_ATOMIC_MODE);
+
+  do_tests();
+
+  /*
+    workaround until we know why it crashes randomly on some machine
+    (BUG#22320).
+  */
+  sleep(2);
+  pthread_mutex_destroy(&mutex);
+  pthread_cond_destroy(&cond);
+  pthread_attr_destroy(&thr_attr);
+  my_end(0);
+  return exit_status();
+}
+