restored run-time thread lib detection

sql/stacktrace.c:
  removed code duplication
sql/stacktrace.h:
  removed code duplication

include/my_pthread.h

@@ -701,6 +701,15 @@ extern uint my_thread_end_wait_time;
   Keep track of shutdown,signal, and main threads so that my_end() will not
   report errors with them
 */
+
+/* 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;
+
 	/* statistics_xxx functions are for not essential statistic */
 
 #ifndef thread_safe_increment

include/thr_alarm.h

@@ -24,11 +24,6 @@ extern "C" {
 #ifndef USE_ALARM_THREAD
 #define USE_ONE_SIGNAL_HAND		/* One must call process_alarm */
 #endif
-#ifdef HAVE_LINUXTHREADS
-#define THR_CLIENT_ALARM SIGALRM
-#else
-#define THR_CLIENT_ALARM SIGUSR1
-#endif
 #ifdef HAVE_rts_threads
 #undef USE_ONE_SIGNAL_HAND
 #define USE_ALARM_THREAD
@@ -90,6 +85,9 @@ typedef struct st_alarm {
   my_bool malloced;
 } ALARM;
 
+extern uint thr_client_alarm;
+extern pthread_t alarm_thread;
+
 #define thr_alarm_init(A) (*(A))=0
 #define thr_alarm_in_use(A) (*(A)!= 0)
 void init_thr_alarm(uint max_alarm);

mysys/my_pthread.c

@@ -31,6 +31,8 @@
 
 uint thd_lib_detected= 0;
 
+uint thd_lib_detected;
+
 #ifndef my_pthread_setprio
 void my_pthread_setprio(pthread_t thread_id,int prior)
 {
@@ -51,8 +53,6 @@ int my_pthread_getprio(pthread_t thread_id)
   int policy;
   if (!pthread_getschedparam(thread_id,&policy,&tmp_sched_param))
   {
-    DBUG_PRINT("thread",("policy: %d  priority: %d",
-			 policy,tmp_sched_param.sched_priority));
     return tmp_sched_param.sched_priority;
   }
 #endif
@@ -314,8 +314,6 @@ void sigwait_handle_sig(int sig)
   pthread_mutex_unlock(&LOCK_sigwait);
 }
 
-extern pthread_t alarm_thread;
-
 void *sigwait_thread(void *set_arg)
 {
   sigset_t *set=(sigset_t*) set_arg;
@@ -334,7 +332,9 @@ void *sigwait_thread(void *set_arg)
       sigaction(i, &sact, (struct sigaction*) 0);
     }
   }
-  sigaddset(set,THR_CLIENT_ALARM);
+  /* 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

@@ -20,6 +20,7 @@
 
 #include "mysys_priv.h"
 #include <m_string.h>
+#include <signal.h>
 
 #ifdef THREAD
 #ifdef USE_TLS
@@ -63,6 +64,8 @@ nptl_pthread_exit_hack_handler(void *arg __attribute((unused)))
 #endif
 
 
+static uint get_thread_lib(void);
+
 /*
   initialize thread environment
 
@@ -76,6 +79,8 @@ nptl_pthread_exit_hack_handler(void *arg __attribute((unused)))
 
 my_bool my_thread_global_init(void)
 {
+  thd_lib_detected= get_thread_lib();
+
   if (pthread_key_create(&THR_KEY_mysys,0))
   {
     fprintf(stderr,"Can't initialize threads: error %d\n",errno);
@@ -395,4 +400,20 @@ 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

@@ -34,6 +34,7 @@
 #define ETIME ETIMEDOUT
 #endif
 
+uint thr_client_alarm;
 static int alarm_aborted=1;			/* No alarm thread */
 my_bool thr_alarm_inited= 0;
 volatile my_bool alarm_thread_running= 0;
@@ -56,9 +57,7 @@ static void *alarm_handler(void *arg);
 #define reschedule_alarms() pthread_kill(alarm_thread,THR_SERVER_ALARM)
 #endif
 
-#if THR_CLIENT_ALARM != SIGALRM || defined(USE_ALARM_THREAD)
 static sig_handler thread_alarm(int sig __attribute__((unused)));
-#endif
 
 static int compare_ulong(void *not_used __attribute__((unused)),
 			 byte *a_ptr,byte* b_ptr)
@@ -77,9 +76,13 @@ void init_thr_alarm(uint max_alarms)
   sigfillset(&full_signal_set);			/* Neaded to block signals */
   pthread_mutex_init(&LOCK_alarm,MY_MUTEX_INIT_FAST);
   pthread_cond_init(&COND_alarm,NULL);
-#if THR_CLIENT_ALARM != SIGALRM || defined(USE_ALARM_THREAD)
-  my_sigset(THR_CLIENT_ALARM,thread_alarm);
+  thr_client_alarm= thd_lib_detected == THD_LIB_LT ?  SIGALRM : SIGUSR1;
+#ifndef USE_ALARM_THREAD
+  if (thd_lib_detected != THD_LIB_LT)
 #endif
+  {
+    my_sigset(thr_client_alarm, thread_alarm);
+  }
   sigemptyset(&s);
   sigaddset(&s, THR_SERVER_ALARM);
   alarm_thread=pthread_self();
@@ -97,10 +100,11 @@ void init_thr_alarm(uint max_alarms)
   }
 #elif defined(USE_ONE_SIGNAL_HAND)
   pthread_sigmask(SIG_BLOCK, &s, NULL);		/* used with sigwait() */
-#if THR_SERVER_ALARM == THR_CLIENT_ALARM
-  my_sigset(THR_CLIENT_ALARM,process_alarm);	/* Linuxthreads */
-  pthread_sigmask(SIG_UNBLOCK, &s, NULL);
-#endif
+  if (thd_lib_detected == THD_LIB_LT)
+  {
+    my_sigset(thr_client_alarm, process_alarm);        /* Linuxthreads */
+    pthread_sigmask(SIG_UNBLOCK, &s, NULL);
+  }
 #else
   my_sigset(THR_SERVER_ALARM, process_alarm);
   pthread_sigmask(SIG_UNBLOCK, &s, NULL);
@@ -152,7 +156,7 @@ my_bool thr_alarm(thr_alarm_t *alrm, uint sec, ALARM *alarm_data)
 
   now=(ulong) time((time_t*) 0);
   pthread_sigmask(SIG_BLOCK,&full_signal_set,&old_mask);
-  pthread_mutex_lock(&LOCK_alarm);	/* Lock from threads & alarms */
+  pthread_mutex_lock(&LOCK_alarm);        /* Lock from threads & alarms */
   if (alarm_aborted > 0)
   {					/* No signal thread */
     DBUG_PRINT("info", ("alarm aborted"));
@@ -273,18 +277,17 @@ sig_handler process_alarm(int sig __attribute__((unused)))
   This must be first as we can't call DBUG inside an alarm for a normal thread
 */
 
-#if THR_SERVER_ALARM == THR_CLIENT_ALARM
-  if (!pthread_equal(pthread_self(),alarm_thread))
+  if (thd_lib_detected == THD_LIB_LT &&
+      !pthread_equal(pthread_self(),alarm_thread))
   {
 #if defined(MAIN) && !defined(__bsdi__)
     printf("thread_alarm in process_alarm\n"); fflush(stdout);
 #endif
 #ifdef DONT_REMEMBER_SIGNAL
-    my_sigset(THR_CLIENT_ALARM,process_alarm);	/* int. thread system calls */
+    my_sigset(thr_client_alarm, process_alarm);	/* int. thread system calls */
 #endif
     return;
   }
-#endif
 
   /*
     We have to do do the handling of the alarm in a sub function,
@@ -328,7 +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, THR_CLIENT_ALARM))
+	    pthread_kill(alarm_data->thread, thr_client_alarm))
 	{
 #ifdef MAIN
 	  printf("Warning: pthread_kill couldn't find thread!!!\n");
@@ -352,7 +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, THR_CLIENT_ALARM))
+	    pthread_kill(alarm_data->thread, thr_client_alarm))
 	{
 #ifdef MAIN
 	  printf("Warning: pthread_kill couldn't find thread!!!\n");
@@ -488,7 +491,7 @@ void thr_alarm_info(ALARM_INFO *info)
   ARGSUSED
 */
 
-#if THR_CLIENT_ALARM != SIGALRM || defined(USE_ALARM_THREAD)
+
 static sig_handler thread_alarm(int sig)
 {
 #ifdef MAIN
@@ -498,7 +501,6 @@ static sig_handler thread_alarm(int sig)
   my_sigset(sig,thread_alarm);		/* int. thread system calls */
 #endif
 }
-#endif
 
 
 #ifdef HAVE_TIMESPEC_TS_SEC
@@ -784,9 +786,7 @@ static void *signal_hand(void *arg __attribute__((unused)))
   sigaddset(&set,SIGINT);
   sigaddset(&set,SIGQUIT);
   sigaddset(&set,SIGTERM);
-#if THR_CLIENT_ALARM != SIGHUP
   sigaddset(&set,SIGHUP);
-#endif
 #ifdef SIGTSTP
   sigaddset(&set,SIGTSTP);
 #endif
@@ -797,7 +797,7 @@ static void *signal_hand(void *arg __attribute__((unused)))
   puts("Starting signal handling thread");
 #endif
   printf("server alarm: %d  thread alarm: %d\n",
-	 THR_SERVER_ALARM,THR_CLIENT_ALARM);
+         THR_SERVER_ALARM, thr_client_alarm);
   DBUG_PRINT("info",("Starting signal and alarm handling thread"));
   for(;;)
   {
@@ -865,11 +865,11 @@ int main(int argc __attribute__((unused)),char **argv __attribute__((unused)))
   sigaddset(&set,SIGTSTP);
 #endif
   sigaddset(&set,THR_SERVER_ALARM);
-  sigdelset(&set,THR_CLIENT_ALARM);
+  sigdelset(&set, thr_client_alarm);
   (void) pthread_sigmask(SIG_SETMASK,&set,NULL);
 #ifdef NOT_USED
   sigemptyset(&set);
-  sigaddset(&set,THR_CLIENT_ALARM);
+  sigaddset(&set, thr_client_alarm);
   VOID(pthread_sigmask(SIG_UNBLOCK, &set, (sigset_t*) 0));
 #endif
 

sql/mysqld.cc

@@ -195,12 +195,6 @@ inline void reset_floating_point_exceptions()
 
 } /* cplusplus */
 
-
-#if defined(HAVE_LINUXTHREADS)
-#define THR_KILL_SIGNAL SIGINT
-#else
-#define THR_KILL_SIGNAL SIGUSR2		// Can't use this with LinuxThreads
-#endif
 #define MYSQL_KILL_SIGNAL SIGTERM
 
 #ifdef HAVE_GLIBC2_STYLE_GETHOSTBYNAME_R
@@ -605,6 +599,7 @@ pthread_mutex_t  LOCK_server_started;
 pthread_cond_t  COND_server_started;
 
 int mysqld_server_started= 0;
+static uint thr_kill_signal;
 
 File_parser_dummy_hook file_parser_dummy_hook;
 
@@ -788,7 +783,7 @@ static void close_connections(void)
     DBUG_PRINT("info",("Waiting for select thread"));
 
 #ifndef DONT_USE_THR_ALARM
-    if (pthread_kill(select_thread,THR_CLIENT_ALARM))
+    if (pthread_kill(select_thread, thr_client_alarm))
       break;					// allready dead
 #endif
     set_timespec(abstime, 2);
@@ -2294,7 +2289,9 @@ static void init_signals(void)
   DBUG_ENTER("init_signals");
 
   if (test_flags & TEST_SIGINT)
-    my_sigset(THR_KILL_SIGNAL,end_thread_signal);
+  {
+    my_sigset(thr_kill_signal, end_thread_signal);
+  }
   my_sigset(THR_SERVER_ALARM,print_signal_warning); // Should never be called!
 
   if (!(test_flags & TEST_NO_STACKTRACE) || (test_flags & TEST_CORE_ON_SIGNAL))
@@ -2351,8 +2348,12 @@ static void init_signals(void)
 #endif
   sigaddset(&set,THR_SERVER_ALARM);
   if (test_flags & TEST_SIGINT)
-    sigdelset(&set,THR_KILL_SIGNAL);		// May be SIGINT
-  sigdelset(&set,THR_CLIENT_ALARM);		// For alarms
+  {
+    // May be SIGINT
+    sigdelset(&set, thr_kill_signal);
+  }
+  // For alarms
+  sigdelset(&set, thr_client_alarm);
   sigprocmask(SIG_SETMASK,&set,NULL);
   pthread_sigmask(SIG_SETMASK,&set,NULL);
   DBUG_VOID_RETURN;
@@ -2415,23 +2416,19 @@ pthread_handler_t signal_hand(void *arg __attribute__((unused)))
   */
   init_thr_alarm(thread_scheduler.max_threads +
 		 global_system_variables.max_insert_delayed_threads + 10);
-#if SIGINT != THR_KILL_SIGNAL
-  if (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
     (void) pthread_sigmask(SIG_UNBLOCK,&set,NULL);
   }
-#endif
   (void) sigemptyset(&set);			// Setup up SIGINT for debug
 #ifdef USE_ONE_SIGNAL_HAND
   (void) sigaddset(&set,THR_SERVER_ALARM);	// For alarms
 #endif
 #ifndef IGNORE_SIGHUP_SIGQUIT
   (void) sigaddset(&set,SIGQUIT);
-#if THR_CLIENT_ALARM != SIGHUP
   (void) sigaddset(&set,SIGHUP);
-#endif
 #endif
   (void) sigaddset(&set,SIGTERM);
   (void) sigaddset(&set,SIGTSTP);
@@ -3626,6 +3623,13 @@ int main(int argc, char **argv)
   MY_INIT(argv[0]);		// init my_sys library & pthreads
   /* nothing should come before this line ^^^ */
 
+  /* Set signal used to kill MySQL */
+#if defined(SIGUSR2)
+  thr_kill_signal= thd_lib_detected == THD_LIB_LT ? SIGINT : SIGUSR2;
+#else
+  thr_kill_signal= SIGINT;
+#endif
+
   /*
     Perform basic logger initialization logger. Should be called after
     MY_INIT, as it initializes mutexes. Log tables are inited later.

sql/stacktrace.c

@@ -55,19 +55,6 @@ void safe_print_str(const char* name, const char* val, int max_len)
 
 static my_bool is_nptl;
 
-/* Check if we are using NPTL or LinuxThreads on Linux */
-void check_thread_lib(void)
-{
-  char buf[5];
-
-#ifdef _CS_GNU_LIBPTHREAD_VERSION
-  confstr(_CS_GNU_LIBPTHREAD_VERSION, buf, sizeof(buf));
-  is_nptl = !strncasecmp(buf, "NPTL", sizeof(buf));
-#else
-  is_nptl = 0;
-#endif
-}
-
 #if defined(__alpha__) && defined(__GNUC__)
 /*
   The only way to backtrace without a symbol table on alpha
@@ -173,8 +160,8 @@ terribly wrong...\n");
 #endif  /* __alpha__ */
 
   /* We are 1 frame above signal frame with NPTL and 2 frames above with LT */
-  sigreturn_frame_count = is_nptl ? 1 : 2;
-  
+  sigreturn_frame_count = thd_lib_detected == THD_LIB_LT ? 2 : 1;
+
   while (fp < (uchar**) stack_bottom)
   {
 #if defined(__i386__) || defined(__x86_64__)

sql/stacktrace.h

@@ -27,11 +27,9 @@ extern char* heap_start;
 
 #define init_stacktrace() do {                                 \
                             heap_start = (char*) &__bss_start; \
-                            check_thread_lib();                \
                           } while(0);
 void print_stacktrace(gptr stack_bottom, ulong thread_stack);
 void safe_print_str(const char* name, const char* val, int max_len);
-void check_thread_lib(void);  
 #endif /* (defined (__i386__) || (defined(__alpha__) && defined(__GNUC__))) */
 #endif /* TARGET_OS_LINUX */