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2001-11-30  Andreas Schwab  <schwab@suse.de>

	* pthread.c (pthread_handle_sigcancel) [THREAD_SELF]: Double check
	that self is the manager thread, and initialize the thread
	register if not.
	(thread_self_stack) [THREAD_SELF]: New function to find self via
	stack pointer.
	* manager.c (pthread_handle_create): Don't block cancel signal any
	more.

	(THREAD_GETMEM_NC):
This commit is contained in:
Ulrich Drepper 2001-11-30 21:14:09 +00:00
parent 096f115125
commit c3317d1e8b
3 changed files with 47 additions and 17 deletions
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12
linuxthreads/ChangeLog
View File

@ -1,3 +1,13 @@
2001-11-30 Andreas Schwab <schwab@suse.de>
* pthread.c (pthread_handle_sigcancel) [THREAD_SELF]: Double check
that self is the manager thread, and initialize the thread
register if not.
(thread_self_stack) [THREAD_SELF]: New function to find self via
stack pointer.
* manager.c (pthread_handle_create): Don't block cancel signal any
more.
2001-11-29 Andreas Jaeger <aj@suse.de>
* sysdeps/x86_64/pt-machine.h: Use %gs as thread specific
@ -5,7 +15,7 @@
(THREAD_SELF): New.
(INIT_THREAD_SELF): New.
(THREAD_GETMEM): New.
(THREAD_GETMEM_NC):
(THREAD_GETMEM_NC):
(THREAD_SETMEM): New.
(THREAD_SETMEM_NC): New.
(FLOATING_STACKS): Define.

13
linuxthreads/manager.c
View File

@ -534,7 +534,6 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
size_t guardsize = 0;
int pagesize = __getpagesize();
int saved_errno;
sigset_t newmask, oldmask;
/* First check whether we have to change the policy and if yes, whether
we can do this. Normally this should be done by examining the
@ -620,11 +619,6 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
if ((mask & (__pthread_threads_events.event_bits[idx]
| event_maskp->event_bits[idx])) != 0)
{
/* Block cancel signal in the child until it is fully
initialized. */
sigemptyset(&newmask);
sigaddset(&newmask, __pthread_sig_cancel);
sigprocmask(SIG_BLOCK, &newmask, &oldmask);
/* Lock the mutex the child will use now so that it will stop. */
__pthread_lock(new_thread->p_lock, NULL);
@ -653,7 +647,6 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
__pthread_sig_cancel, new_thread);
#endif
saved_errno = errno;
sigprocmask(SIG_SETMASK, &oldmask, NULL);
if (pid != -1)
{
/* Now fill in the information about the new thread in
@ -679,11 +672,6 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
}
if (pid == 0)
{
/* Block cancel signal in the child until it is fully
initialized. */
sigemptyset(&newmask);
sigaddset(&newmask, __pthread_sig_cancel);
sigprocmask(SIG_BLOCK, &newmask, &oldmask);
#ifdef NEED_SEPARATE_REGISTER_STACK
pid = __clone2(pthread_start_thread,
(void **)new_thread_bottom,
@ -700,7 +688,6 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
__pthread_sig_cancel, new_thread);
#endif /* !NEED_SEPARATE_REGISTER_STACK */
saved_errno = errno;
sigprocmask(SIG_SETMASK, &oldmask, NULL);
}
/* Check if cloning succeeded */
if (pid == -1) {

39
linuxthreads/pthread.c
View File

@ -709,7 +709,7 @@ int pthread_equal(pthread_t thread1, pthread_t thread2)
#ifndef THREAD_SELF
pthread_descr __pthread_find_self()
pthread_descr __pthread_find_self(void)
{
char * sp = CURRENT_STACK_FRAME;
pthread_handle h;
@ -721,6 +721,21 @@ pthread_descr __pthread_find_self()
return h->h_descr;
}
#else
static pthread_descr thread_self_stack(void)
{
char *sp = CURRENT_STACK_FRAME;
pthread_handle h;
if (sp >= __pthread_manager_thread_bos && sp < __pthread_manager_thread_tos)
return &__pthread_manager_thread;
h = __pthread_handles + 2;
while (! (sp <= (char *) h->h_descr && sp >= h->h_bottom))
h++;
return h->h_descr;
}
#endif
/* Thread scheduling */
@ -769,7 +784,7 @@ int pthread_getschedparam(pthread_t thread, int *policy,
return 0;
}
int __pthread_yield ()
int __pthread_yield (void)
{
/* For now this is equivalent with the POSIX call. */
return sched_yield ();
@ -841,8 +856,26 @@ static void pthread_handle_sigcancel(int sig)
if (self == &__pthread_manager_thread)
{
#ifdef THREAD_SELF
/* A new thread might get a cancel signal before it is fully
initialized, so that the thread register might still point to the
manager thread. Double check that this is really the manager
thread. */
pthread_descr real_self = thread_self_stack();
if (real_self == &__pthread_manager_thread)
{
__pthread_manager_sighandler(sig);
return;
}
/* Oops, thread_self() isn't working yet.. */
self = real_self;
# ifdef INIT_THREAD_SELF
INIT_THREAD_SELF(self, self->p_nr);
# endif
#else
__pthread_manager_sighandler(sig);
return;
#endif
}
if (__builtin_expect (__pthread_exit_requested, 0)) {
/* Main thread should accumulate times for thread manager and its
@ -884,7 +917,7 @@ static void pthread_handle_sigdebug(int sig)
Notice that we can't free the stack segments, as the forked thread
may hold pointers into them. */
void __pthread_reset_main_thread()
void __pthread_reset_main_thread(void)
{
pthread_descr self = thread_self();
struct rlimit limit;