Cleanup of thread-type (linuxthread or NTPL) detection code

Move get_thread_lib to mysys/my_pthread.c
Set 'thr_client_alarm' to signal number used by thr_alarm to give alarms


include/my_global.h:
  Fixed to be same as in 5.1
include/my_pthread.h:
  Move things around to be more in line with rest of code
mysys/default.c:
  Fixed two wrong pointer incrementations.
mysys/my_pthread.c:
  Cleanup: Use variable thr_client_alarm
mysys/my_thr_init.c:
  Detect thread library at startup.
  Set also thr_client_alarm signal here, so that we get
  it in init_signals() in mysqld
mysys/thr_alarm.c:
  Set thr_client_alarm depending on which thread library we are using
sql/mysqld.cc:
  Move get_thread_lib to mysys/my_pthread.c

include/my_global.h

@@ -348,10 +348,7 @@ int	__void__;
 #endif
 
 /* Define some useful general macros */
-#if defined(__cplusplus) && defined(__GNUC__)
-#define max(a, b)     ((a) >? (b))
-#define min(a, b)     ((a) <? (b))
-#elif !defined(max)
+#if !defined(max)
 #define max(a, b)	((a) > (b) ? (a) : (b))
 #define min(a, b)	((a) < (b) ? (a) : (b))
 #endif

include/my_pthread.h

@@ -28,14 +28,6 @@
 extern "C" {
 #endif /* __cplusplus */ 
 
-/* Thread library */
-
-#define THD_LIB_OTHER 1
-#define THD_LIB_NPTL  2
-#define THD_LIB_LT    4
-
-extern uint thd_lib_detected;
-
 #if defined(__WIN__) || defined(OS2)
 
 #ifdef OS2
@@ -684,6 +676,15 @@ extern struct st_my_thread_var *_my_thread_var(void) __attribute__ ((const));
 */
 extern pthread_t shutdown_th, main_th, signal_th;
 
+/* Which kind of thread library is in use */
+
+#define THD_LIB_OTHER 1
+#define THD_LIB_NPTL  2
+#define THD_LIB_LT    4
+
+extern uint thd_lib_detected;
+extern uint thr_client_alarm;
+
 	/* statistics_xxx functions are for not essential statistic */
 
 #ifndef thread_safe_increment

mysys/default.c

@@ -282,7 +282,7 @@ static int search_default_file(DYNAMIC_ARRAY *args, MEM_ROOT *alloc,
 {
   char **ext;
 
-  for (ext= (char**) f_extensions; *ext; *ext++)
+  for (ext= (char**) f_extensions; *ext; ext++)
   {
     int error;
     if ((error= search_default_file_with_ext(args, alloc, dir, *ext,
@@ -543,7 +543,7 @@ void print_defaults(const char *conf_file, const char **groups)
 #endif
     for (dirs=default_directories ; *dirs; dirs++)
     {
-      for (ext= (char**) f_extensions; *ext; *ext++)
+      for (ext= (char**) f_extensions; *ext; ext++)
       {
 	const char *pos;
 	char *end;

mysys/my_pthread.c

@@ -32,6 +32,7 @@
 #endif
 
 uint thd_lib_detected;
+uint thr_client_alarm;
 
 #ifndef my_pthread_setprio
 void my_pthread_setprio(pthread_t thread_id,int prior)
@@ -322,7 +323,9 @@ void *sigwait_thread(void *set_arg)
       sigaction(i, &sact, (struct sigaction*) 0);
     }
   }
-  sigaddset(set, thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1);
+  /* Ensure that init_thr_alarm() is called */
+  DBUG_ASSERT(thr_client_alarm);
+  sigaddset(set, thr_client_alarm);
   pthread_sigmask(SIG_UNBLOCK,(sigset_t*) set,(sigset_t*) 0);
   alarm_thread=pthread_self();			/* For thr_alarm */
 

mysys/my_thr_init.c

@@ -21,6 +21,7 @@
 
 #include "mysys_priv.h"
 #include <m_string.h>
+#include <signal.h>
 
 #ifdef THREAD
 #ifdef USE_TLS
@@ -44,6 +45,8 @@ pthread_mutexattr_t my_fast_mutexattr;
 pthread_mutexattr_t my_errchk_mutexattr;
 #endif
 
+static uint get_thread_lib(void);
+
 /*
   initialize thread environment
 
@@ -57,6 +60,12 @@ pthread_mutexattr_t my_errchk_mutexattr;
 
 my_bool my_thread_global_init(void)
 {
+  thd_lib_detected= get_thread_lib();
+  if (thd_lib_detected == THD_LIB_LT)
+    thr_client_alarm= SIGALRM;
+  else
+    thr_client_alarm= SIGUSR1;
+
   if (pthread_key_create(&THR_KEY_mysys,0))
   {
     fprintf(stderr,"Can't initialize threads: error %d\n",errno);
@@ -276,4 +285,20 @@ const char *my_thread_name(void)
 }
 #endif /* DBUG_OFF */
 
+
+static uint get_thread_lib(void)
+{
+  char buff[64];
+    
+#ifdef _CS_GNU_LIBPTHREAD_VERSION
+  confstr(_CS_GNU_LIBPTHREAD_VERSION, buff, sizeof(buff));
+
+  if (!strncasecmp(buff, "NPTL", 4))
+    return THD_LIB_NPTL;
+  if (!strncasecmp(buff, "linuxthreads", 12))
+    return THD_LIB_LT;
+#endif
+  return THD_LIB_OTHER;
+}
+
 #endif /* THREAD */

mysys/thr_alarm.c

@@ -82,8 +82,7 @@ void init_thr_alarm(uint max_alarms)
   if (thd_lib_detected != THD_LIB_LT)
 #endif
   {
-    my_sigset(thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1,
-	      thread_alarm);
+    my_sigset(thr_client_alarm, thread_alarm);
   }
   sigemptyset(&s);
   sigaddset(&s, THR_SERVER_ALARM);
@@ -104,8 +103,7 @@ void init_thr_alarm(uint max_alarms)
   pthread_sigmask(SIG_BLOCK, &s, NULL);		/* used with sigwait() */
   if (thd_lib_detected == THD_LIB_LT)
   {
-    my_sigset(thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1,
-              process_alarm);        /* Linuxthreads */
+    my_sigset(thr_client_alarm, process_alarm);        /* Linuxthreads */
     pthread_sigmask(SIG_UNBLOCK, &s, NULL);
   }
 #else
@@ -286,8 +284,7 @@ sig_handler process_alarm(int sig __attribute__((unused)))
     printf("thread_alarm in process_alarm\n"); fflush(stdout);
 #endif
 #ifdef DONT_REMEMBER_SIGNAL
-    my_sigset(thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1,
-              process_alarm);	/* int. thread system calls */
+    my_sigset(thr_client_alarm, process_alarm);	/* int. thread system calls */
 #endif
     return;
   }
@@ -334,8 +331,7 @@ static sig_handler process_alarm_part2(int sig __attribute__((unused)))
 	alarm_data=(ALARM*) queue_element(&alarm_queue,i);
 	alarm_data->alarmed=1;			/* Info to thread */
 	if (pthread_equal(alarm_data->thread,alarm_thread) ||
-	    pthread_kill(alarm_data->thread,
-			 thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1))
+	    pthread_kill(alarm_data->thread, thr_client_alarm))
 	{
 #ifdef MAIN
 	  printf("Warning: pthread_kill couldn't find thread!!!\n");
@@ -359,8 +355,7 @@ static sig_handler process_alarm_part2(int sig __attribute__((unused)))
 	alarm_data->alarmed=1;			/* Info to thread */
 	DBUG_PRINT("info",("sending signal to waiting thread"));
 	if (pthread_equal(alarm_data->thread,alarm_thread) ||
-	    pthread_kill(alarm_data->thread,
-			 thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1))
+	    pthread_kill(alarm_data->thread, thr_client_alarm))
 	{
 #ifdef MAIN
 	  printf("Warning: pthread_kill couldn't find thread!!!\n");
@@ -948,7 +943,7 @@ static void *signal_hand(void *arg __attribute__((unused)))
 #endif
 #endif /* OS2 */
   printf("server alarm: %d  thread alarm: %d\n",
-	 THR_SERVER_ALARM, thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1);
+         THR_SERVER_ALARM, thr_client_alarm);
   DBUG_PRINT("info",("Starting signal and alarm handling thread"));
   for(;;)
   {
@@ -1020,11 +1015,11 @@ int main(int argc __attribute__((unused)),char **argv __attribute__((unused)))
   sigaddset(&set,SIGTSTP);
 #endif
   sigaddset(&set,THR_SERVER_ALARM);
-  sigdelset(&set, thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1);
+  sigdelset(&set, thr_client_alarm);
   (void) pthread_sigmask(SIG_SETMASK,&set,NULL);
 #ifdef NOT_USED
   sigemptyset(&set);
-  sigaddset(&set, thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1);
+  sigaddset(&set, thr_client_alarm);
   VOID(pthread_sigmask(SIG_UNBLOCK, &set, (sigset_t*) 0));
 #endif
 #endif /* OS2 */

sql/mysqld.cc

@@ -459,6 +459,7 @@ pthread_cond_t COND_refresh,COND_thread_count, COND_slave_stopped,
 pthread_cond_t COND_thread_cache,COND_flush_thread_cache;
 pthread_t signal_thread;
 pthread_attr_t connection_attrib;
+static uint thr_kill_signal;
 
 #ifdef __WIN__
 #undef	 getpid
@@ -499,7 +500,6 @@ static void clean_up(bool print_message);
 static void clean_up_mutexes(void);
 static int test_if_case_insensitive(const char *dir_name);
 static void create_pid_file();
-static uint get_thread_lib(void);
 
 /****************************************************************************
 ** Code to end mysqld
@@ -539,8 +539,7 @@ static void close_connections(void)
     DBUG_PRINT("info",("Waiting for select_thread"));
 
 #ifndef DONT_USE_THR_ALARM
-    if (pthread_kill(select_thread,
-		     thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1))
+    if (pthread_kill(select_thread, thr_client_alarm))
       break;					// allready dead
 #endif
     set_timespec(abstime, 2);
@@ -1838,8 +1837,7 @@ static void init_signals(void)
 
   if (test_flags & TEST_SIGINT)
   {
-    my_sigset(thd_lib_detected == THD_LIB_LT ? SIGINT : SIGUSR2,
-              end_thread_signal);
+    my_sigset(thr_kill_signal, end_thread_signal);
   }
   my_sigset(THR_SERVER_ALARM, print_signal_warning); // Should never be called!
 
@@ -1904,10 +1902,10 @@ static void init_signals(void)
   if (test_flags & TEST_SIGINT)
   {
     // May be SIGINT
-    sigdelset(&set, thd_lib_detected == THD_LIB_LT ? SIGINT : SIGUSR2);
+    sigdelset(&set, thr_kill_signal);
   }
   // For alarms
-  sigdelset(&set, thd_lib_detected == THD_LIB_LT ? SIGALRM : SIGUSR1);
+  sigdelset(&set, thr_client_alarm);
   sigprocmask(SIG_SETMASK,&set,NULL);
   pthread_sigmask(SIG_SETMASK,&set,NULL);
   DBUG_VOID_RETURN;
@@ -1962,7 +1960,7 @@ extern "C" void *signal_hand(void *arg __attribute__((unused)))
   */
   init_thr_alarm(max_connections +
 		 global_system_variables.max_insert_delayed_threads + 10);
-  if (thd_lib_detected != THD_LIB_LT && test_flags & TEST_SIGINT)
+  if (thd_lib_detected != THD_LIB_LT && (test_flags & TEST_SIGINT))
   {
     (void) sigemptyset(&set);			// Setup up SIGINT for debug
     (void) sigaddset(&set,SIGINT);		// For debugging
@@ -2235,7 +2233,6 @@ int main(int argc, char **argv)
   MY_INIT(argv[0]);		// init my_sys library & pthreads
   tzset();			// Set tzname
 
-  thd_lib_detected= get_thread_lib();
   start_time=time((time_t*) 0);
 #ifdef OS2
   {
@@ -2253,6 +2250,9 @@ int main(int argc, char **argv)
   }
 #endif
 
+  /* Set signal used to kill MySQL */
+  thr_kill_signal= thd_lib_detected == THD_LIB_LT ? SIGINT : SIGUSR2;
+
   /*
     Init mutexes for the global MYSQL_LOG objects.
     As safe_mutex depends on what MY_INIT() does, we can't init the mutexes of
@@ -5548,22 +5548,6 @@ static void create_pid_file()
 }
 
 
-static uint get_thread_lib(void)
-{
-  char buff[64];
-    
-#ifdef _CS_GNU_LIBPTHREAD_VERSION
-  confstr(_CS_GNU_LIBPTHREAD_VERSION, buff, sizeof(buff));
-
-  if (!strncasecmp(buff, "NPTL", 4))
-    return THD_LIB_NPTL;
-  else if (!strncasecmp(buff, "linuxthreads", 12))
-    return THD_LIB_LT;
-#endif
-  return THD_LIB_OTHER;
-}
-
-
 /*****************************************************************************
   Instantiate templates
 *****************************************************************************/