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when a thread ends, GDB consider the program exited, i.e. I can't debug 
the codes after pthread_create. 

Reproducible: Always
Steps to Reproduce:
1.create a new thread and wait it
2.the new thread ends
3.now GDB considers the program exited normally

Actual Results: 
[...]$ cat main.c
#include <stdlib.h>
#include <stdio.h>
#include <pthread.h>

void MyProc()
{
	printf( "MyProc : .......Thread : %d......\r\n", (int)
pthread_self() );
}

void *ThreadProc( void *pParam )
{
	printf( "ThreadProc : \r\n" );
	MyProc();
	return NULL;
}

int main(int argc, char *argv[])
{
	pthread_t aThread = 0;
	void		*pRet = NULL;

	pthread_create( &aThread, NULL, ThreadProc, NULL );

	MyProc();

	pthread_join( aThread, &pRet );
	printf( "Main : ...\r\n" );

	return 0;
}

[...]$ gcc -lpthread -g -Wall -othread main.c
[...]$ gdb ./thread
GNU gdb 5.0
Copyright 2000 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you 
are
welcome to change it and/or distribute copies of it under certain 
conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "i386-redhat-linux"...
(gdb) r
Starting program: /home/jizy/./thread
[New Thread 1024 (LWP 12127)]
[New Thread 2049 (LWP 12128)]
[New Thread 1026 (LWP 12129)]
ThreadProc:
MyProc : .......Thread : 1026......

Program exited normally.
(gdb) q


Expected Results:  "Main : ..." and "MyProc : .......Thread : 
1024......"should be outputed.