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* threads.c (do_thread_exit, scm_cancel_thread,

Browse source 
scm_set_thread_cleanup_x, scm_thread_cleanup): Lock on thread-specific
	admin mutex instead of `thread_admin_mutex'.
	* threads.h (scm_i_thread)[admin_mutex]: New field.
	* throw.c (make_jmpbuf): Don't enter critical section during thread
	spawn -- there is a possibility of deadlock if other threads are
	exiting.
This commit is contained in:
Neil Jerram 2008-02-07 01:24:31 +00:00
parent 0ea659f3ba
commit 86a597f8b3
5 changed files with 37 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

1
NEWS
View file

@ -54,6 +54,7 @@ system and library calls.
** Fixed compilation of `numbers.c' with Sun Studio (Solaris 9)
** Fixed wrong-type-arg errors when creating zero length SRFI-4
uniform vectors on AIX.
** Fixed a deadlock that occurs upon GC with multiple threads.
* New modules (see the manual for details)

10
libguile/ChangeLog
View file

@ -1,3 +1,13 @@
2008-02-07 Julian Graham <joolean@gmail.com>
* threads.c (do_thread_exit, scm_cancel_thread,
scm_set_thread_cleanup_x, scm_thread_cleanup): Lock on thread-specific
admin mutex instead of `thread_admin_mutex'.
* threads.h (scm_i_thread)[admin_mutex]: New field.
* throw.c (make_jmpbuf): Don't enter critical section during thread
spawn -- there is a possibility of deadlock if other threads are
exiting.
2008-02-06 Neil Jerram <neil@ossau.uklinux.net>
* gc-malloc.c (scm_gc_malloc): Return NULL if requested size is 0.

35
libguile/threads.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -435,6 +435,7 @@ guilify_self_1 (SCM_STACKITEM *base)
/* XXX - check for errors. */
pipe (t->sleep_pipe);
scm_i_pthread_mutex_init (&t->heap_mutex, NULL);
scm_i_pthread_mutex_init (&t->admin_mutex, NULL);
t->clear_freelists_p = 0;
t->gc_running_p = 0;
t->canceled = 0;
@ -494,7 +495,7 @@ do_thread_exit (void *v)
scm_handle_by_message_noexit, NULL);
}
scm_i_scm_pthread_mutex_lock (&thread_admin_mutex);
scm_i_scm_pthread_mutex_lock (&t->admin_mutex);
t->exited = 1;
close (t->sleep_pipe[0]);
@ -502,7 +503,7 @@ do_thread_exit (void *v)
while (scm_is_true (unblock_from_queue (t->join_queue)))
;
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
return NULL;
}
@ -931,15 +932,15 @@ SCM_DEFINE (scm_cancel_thread, "cancel-thread", 1, 0, 0,
SCM_VALIDATE_THREAD (1, thread);
t = SCM_I_THREAD_DATA (thread);
scm_i_scm_pthread_mutex_lock (&thread_admin_mutex);
scm_i_scm_pthread_mutex_lock (&t->admin_mutex);
if (!t->canceled)
{
t->canceled = 1;
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
scm_i_pthread_cancel (t->pthread);
}
else
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
return SCM_UNSPECIFIED;
}
@ -957,13 +958,13 @@ SCM_DEFINE (scm_set_thread_cleanup_x, "set-thread-cleanup!", 2, 0, 0,
if (!scm_is_false (proc))
SCM_VALIDATE_THUNK (2, proc);
scm_i_pthread_mutex_lock (&thread_admin_mutex);
t = SCM_I_THREAD_DATA (thread);
scm_i_pthread_mutex_lock (&t->admin_mutex);
if (!(t->exited || t->canceled))
t->cleanup_handler = proc;
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
return SCM_UNSPECIFIED;
}
@ -979,10 +980,10 @@ SCM_DEFINE (scm_thread_cleanup, "thread-cleanup", 1, 0, 0,
SCM_VALIDATE_THREAD (1, thread);
scm_i_pthread_mutex_lock (&thread_admin_mutex);
t = SCM_I_THREAD_DATA (thread);
scm_i_pthread_mutex_lock (&t->admin_mutex);
ret = (t->exited || t->canceled) ? SCM_BOOL_F : t->cleanup_handler;
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
return ret;
}
@ -1001,24 +1002,24 @@ SCM_DEFINE (scm_join_thread, "join-thread", 1, 0, 0,
if (scm_is_eq (scm_current_thread (), thread))
SCM_MISC_ERROR ("cannot join the current thread", SCM_EOL);
scm_i_scm_pthread_mutex_lock (&thread_admin_mutex);
t = SCM_I_THREAD_DATA (thread);
scm_i_scm_pthread_mutex_lock (&t->admin_mutex);
if (!t->exited)
{
while (1)
{
block_self (t->join_queue, thread, &thread_admin_mutex, NULL);
block_self (t->join_queue, thread, &t->admin_mutex, NULL);
if (t->exited)
break;
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
SCM_TICK;
scm_i_scm_pthread_mutex_lock (&thread_admin_mutex);
scm_i_scm_pthread_mutex_lock (&t->admin_mutex);
}
}
res = t->result;
scm_i_pthread_mutex_unlock (&thread_admin_mutex);
scm_i_pthread_mutex_unlock (&t->admin_mutex);
return res;
}

5
libguile/threads.h
View file

@ -3,7 +3,7 @@
#ifndef SCM_THREADS_H
#define SCM_THREADS_H
/* Copyright (C) 1996,1997,1998,2000,2001, 2002, 2003, 2004, 2006, 2007 Free Software Foundation, Inc.
/* Copyright (C) 1996,1997,1998,2000,2001, 2002, 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -52,6 +52,9 @@ typedef struct scm_i_thread {
SCM cleanup_handler;
SCM join_queue;
scm_i_pthread_mutex_t admin_mutex;
SCM result;
int canceled;
int exited;

12
libguile/throw.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003, 2004, 2006 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,2000,2001, 2003, 2004, 2006, 2008 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@ -75,13 +75,9 @@ static SCM
make_jmpbuf (void)
{
SCM answer;
SCM_CRITICAL_SECTION_START;
{
SCM_NEWSMOB2 (answer, tc16_jmpbuffer, 0, 0);
SETJBJMPBUF(answer, (jmp_buf *)0);
DEACTIVATEJB(answer);
}
SCM_CRITICAL_SECTION_END;
SCM_NEWSMOB2 (answer, tc16_jmpbuffer, 0, 0);
SETJBJMPBUF(answer, (jmp_buf *)0);
DEACTIVATEJB(answer);
return answer;
}