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[BZ #3123]

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2006-09-08  Ulrich Drepper  <drepper@redhat.com>
	[BZ #3123]
	* sysdeps/pthread/pthread_cond_wait.c (__condvar_cleanup): Don't
	increment WAKEUP_SEQ if this would increase the value beyond TOTAL_SEQ.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.c: Likewise.
	* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.c: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.c: Likewise.
	* Makefile (tests): Add tst-cond22.
	* tst-cond22.c: New file.
This commit is contained in:
Ulrich Drepper 2006-09-08 10:41:17 +00:00
parent 469615bdd4
commit 346e6ad401
7 changed files with 208 additions and 13 deletions
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11
nptl/ChangeLog
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@ -1,3 +1,14 @@
2006-09-08 Ulrich Drepper <drepper@redhat.com>
[BZ #3123]
* sysdeps/pthread/pthread_cond_wait.c (__condvar_cleanup): Don't
increment WAKEUP_SEQ if this would increase the value beyond TOTAL_SEQ.
* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.c: Likewise.
* sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.c: Likewise.
* sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.c: Likewise.
* Makefile (tests): Add tst-cond22.
* tst-cond22.c: New file.
2006-09-05 Ulrich Drepper <drepper@redhat.com>
[BZ #3124]

2
nptl/Makefile
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@ -207,7 +207,7 @@ tests = tst-typesizes \
tst-cond1 tst-cond2 tst-cond3 tst-cond4 tst-cond5 tst-cond6 tst-cond7 \
tst-cond8 tst-cond9 tst-cond10 tst-cond11 tst-cond12 tst-cond13 \
tst-cond14 tst-cond15 tst-cond16 tst-cond17 tst-cond18 tst-cond19 \
tst-cond20 tst-cond21 \
tst-cond20 tst-cond21 tst-cond22 \
tst-robust1 tst-robust2 tst-robust3 tst-robust4 tst-robust5 \
tst-robust6 tst-robust7 tst-robust8 \
tst-robustpi1 tst-robustpi2 tst-robustpi3 tst-robustpi4 \

10
nptl/sysdeps/pthread/pthread_cond_wait.c
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@ -1,4 +1,4 @@
/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
@ -50,8 +50,12 @@ __condvar_cleanup (void *arg)
if (cbuffer->bc_seq == cbuffer->cond->__data.__broadcast_seq)
{
/* This thread is not waiting anymore. Adjust the sequence counters
appropriately. */
++cbuffer->cond->__data.__wakeup_seq;
appropriately. We do not increment WAKEUP_SEQ if this would
bump it over the value of TOTAL_SEQ> This can happen if a thread
was woken and then canceled. */
if (cbuffer->cond->__data.__wakeup_seq
< cbuffer->cond->__data.__total_seq)
++cbuffer->cond->__data.__wakeup_seq;
++cbuffer->cond->__data.__woken_seq;
++cbuffer->cond->__data.__futex;
}

17
nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_timedwait.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -406,10 +406,21 @@ __condvar_tw_cleanup:
cmpl 20(%esp), %eax
jne 3f
addl $1, wakeup_seq(%ebx)
/* We increment the woken_seq counter only if it is lower than
total_seq. If this is not the case the thread was woken and
then canceled. In this case we ignore the signal. */
movl total_seq(%ebx), %eax
movl total_seq+4(%ebx), %edi
cmpl wakeup_seq+4(%ebx), %edi
jb 6f
ja 7f
cmpl wakeup_seq(%ebx), %eax
jbe 7f
6: addl $1, wakeup_seq(%ebx)
adcl $0, wakeup_seq+4(%ebx)
addl $1, cond_futex(%ebx)
7: addl $1, cond_futex(%ebx)
addl $1, woken_seq(%ebx)
adcl $0, woken_seq+4(%ebx)

18
nptl/sysdeps/unix/sysv/linux/i386/i486/pthread_cond_wait.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2004, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -297,11 +297,21 @@ __condvar_w_cleanup:
cmpl 12(%esp), %eax
jne 3f
addl $1, wakeup_seq(%ebx)
/* We increment the woken_seq counter only if it is lower than
total_seq. If this is not the case the thread was woken and
then canceled. In this case we ignore the signal. */
movl total_seq(%ebx), %eax
movl total_seq+4(%ebx), %edi
cmpl wakeup_seq+4(%ebx), %edi
jb 6f
ja 7f
cmpl wakeup_seq(%ebx), %eax
jbe 7f
6: addl $1, wakeup_seq(%ebx)
adcl $0, wakeup_seq+4(%ebx)
addl $1, cond_futex(%ebx)
7: addl $1, cond_futex(%ebx)
addl $1, woken_seq(%ebx)
adcl $0, woken_seq+4(%ebx)

10
nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -67,8 +67,14 @@ __condvar_cleanup:
cmpl 4(%r8), %edx
jne 3f
/* We increment the woken_seq counter only if it is lower than
total_seq. If this is not the case the thread was woken and
then canceled. In this case we ignore the signal. */
movq total_seq(%rdi), %rax
cmpq wakeup_seq(%rdi), %rax
jbe 6f
incq wakeup_seq(%rdi)
incq woken_seq(%rdi)
6: incq woken_seq(%rdi)
incl cond_futex(%rdi)
3: subl $(1 << clock_bits), cond_nwaiters(%rdi)

153
nptl/tst-cond22.c Normal file
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@ -0,0 +1,153 @@
#include <pthreadP.h>
#include <stdio.h>
static pthread_barrier_t b;
static pthread_cond_t c = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
static void
cl (void *arg)
{
pthread_mutex_unlock (&m);
}
static void *
tf (void *arg)
{
if (pthread_mutex_lock (&m) != 0)
{
printf ("%s: mutex_lock failed\n", __func__);
exit (1);
}
int e = pthread_barrier_wait (&b);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("%s: barrier_wait failed\n", __func__);
exit (1);
}
pthread_cleanup_push (cl, NULL);
if (pthread_cond_wait (&c, &m) != 0)
{
printf ("%s: cond_wait failed\n", __func__);
exit (1);
}
pthread_cleanup_pop (0);
if (pthread_mutex_unlock (&m) != 0)
{
printf ("%s: mutex_unlock failed\n", __func__);
exit (1);
}
return NULL;
}
static int
do_test (void)
{
int status = 0;
if (pthread_barrier_init (&b, NULL, 2) != 0)
{
puts ("barrier_init failed");
return 1;
}
pthread_t th;
if (pthread_create (&th, NULL, tf, NULL) != 0)
{
puts ("1st create failed");
return 1;
}
int e = pthread_barrier_wait (&b);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("1st barrier_wait failed");
return 1;
}
if (pthread_mutex_lock (&m) != 0)
{
puts ("1st mutex_lock failed");
return 1;
}
if (pthread_cond_signal (&c) != 0)
{
puts ("1st cond_signal failed");
return 1;
}
if (pthread_cancel (th) != 0)
{
puts ("cancel failed");
return 1;
}
if (pthread_mutex_unlock (&m) != 0)
{
puts ("1st mutex_unlock failed");
return 1;
}
void *res;
if (pthread_join (th, &res) != 0)
{
puts ("1st join failed");
return 1;
}
if (res != PTHREAD_CANCELED)
{
puts ("first thread not canceled");
status = 1;
}
printf ("cond = { %d, %x, %lld, %lld, %lld, %p, %u, %u }\n",
c.__data.__lock, c.__data.__futex, c.__data.__total_seq,
c.__data.__wakeup_seq, c.__data.__woken_seq, c.__data.__mutex,
c.__data.__nwaiters, c.__data.__broadcast_seq);
if (pthread_create (&th, NULL, tf, NULL) != 0)
{
puts ("2nd create failed");
return 1;
}
e = pthread_barrier_wait (&b);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("2nd barrier_wait failed");
return 1;
}
if (pthread_mutex_lock (&m) != 0)
{
puts ("2nd mutex_lock failed");
return 1;
}
if (pthread_cond_signal (&c) != 0)
{
puts ("2nd cond_signal failed");
return 1;
}
if (pthread_mutex_unlock (&m) != 0)
{
puts ("2nd mutex_unlock failed");
return 1;
}
if (pthread_join (th, &res) != 0)
{
puts ("2nd join failed");
return 1;
}
if (res != NULL)
{
puts ("2nd thread canceled");
status = 1;
}
printf ("cond = { %d, %x, %lld, %lld, %lld, %p, %u, %u }\n",
c.__data.__lock, c.__data.__futex, c.__data.__total_seq,
c.__data.__wakeup_seq, c.__data.__woken_seq, c.__data.__mutex,
c.__data.__nwaiters, c.__data.__broadcast_seq);
return status;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"