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(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.

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This commit is contained in:
Ulrich Drepper
2004-12-22 20:10:10 +00:00
parent 0ecb606cb6
commit a334319f65
6215 changed files with 304673 additions and 494300 deletions
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80
nptl/pthread_join.c
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@ -1,4 +1,4 @@
/* Copyright (C) 2002, 2003, 2005, 2006 Free Software Foundation, Inc.
/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -20,18 +20,14 @@
#include <errno.h>
#include <stdlib.h>
#include <atomic.h>
#include "atomic.h"
#include "pthreadP.h"
static void
cleanup (void *arg)
{
/* If we already changed the waiter ID, reset it. The call cannot
fail for any reason but the thread not having done that yet so
there is no reason for a loop. */
atomic_compare_and_exchange_bool_acq ((struct pthread **) arg, NULL,
THREAD_SELF);
*(void **) arg = NULL;
}
@ -40,6 +36,7 @@ pthread_join (threadid, thread_return)
pthread_t threadid;
void **thread_return;
{
struct pthread *self;
struct pthread *pd = (struct pthread *) threadid;
/* Make sure the descriptor is valid. */
@ -52,23 +49,12 @@ pthread_join (threadid, thread_return)
/* We cannot wait for the thread. */
return EINVAL;
struct pthread *self = THREAD_SELF;
int result = 0;
/* During the wait we change to asynchronous cancellation. If we
are canceled the thread we are waiting for must be marked as
un-wait-ed for again. */
pthread_cleanup_push (cleanup, &pd->joinid);
/* Switch to asynchronous cancellation. */
int oldtype = CANCEL_ASYNC ();
if ((pd == self
|| (self->joinid == pd
&& (pd->cancelhandling
& (CANCELING_BITMASK | CANCELED_BITMASK | EXITING_BITMASK
| TERMINATED_BITMASK)) == 0))
&& !CANCEL_ENABLED_AND_CANCELED (self->cancelhandling))
self = THREAD_SELF;
if (pd == self
|| (self->joinid == pd
&& (pd->cancelhandling
& (CANCELING_BITMASK | CANCELED_BITMASK | EXITING_BITMASK
| TERMINATED_BITMASK)) == 0))
/* This is a deadlock situation. The threads are waiting for each
other to finish. Note that this is a "may" error. To be 100%
sure we catch this error we would have to lock the data
@ -76,17 +62,28 @@ pthread_join (threadid, thread_return)
two threads are really caught in this situation they will
deadlock. It is the programmer's problem to figure this
out. */
result = EDEADLK;
return EDEADLK;
/* Wait for the thread to finish. If it is already locked something
is wrong. There can only be one waiter. */
else if (__builtin_expect (atomic_compare_and_exchange_bool_acq (&pd->joinid,
self,
NULL), 0))
if (__builtin_expect (atomic_compare_and_exchange_bool_acq (&pd->joinid,
self,
NULL), 0))
/* There is already somebody waiting for the thread. */
result = EINVAL;
else
/* Wait for the child. */
lll_wait_tid (pd->tid);
return EINVAL;
/* During the wait we change to asynchronous cancellation. If we
are cancelled the thread we are waiting for must be marked as
un-wait-ed for again. */
pthread_cleanup_push (cleanup, &pd->joinid);
/* Switch to asynchronous cancellation. */
int oldtype = CANCEL_ASYNC ();
/* Wait for the child. */
lll_wait_tid (pd->tid);
/* Restore cancellation mode. */
@ -96,19 +93,16 @@ pthread_join (threadid, thread_return)
pthread_cleanup_pop (0);
if (__builtin_expect (result == 0, 1))
{
/* We mark the thread as terminated and as joined. */
pd->tid = -1;
/* We mark the thread as terminated and as joined. */
pd->tid = -1;
/* Store the return value if the caller is interested. */
if (thread_return != NULL)
*thread_return = pd->result;
/* Store the return value if the caller is interested. */
if (thread_return != NULL)
*thread_return = pd->result;
/* Free the TCB. */
__free_tcb (pd);
}
/* Free the TCB. */
__free_tcb (pd);
return result;
return 0;
}