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2000-08-04  Ulrich Drepper  <drepper@redhat.com>

	* manager.c (__pthread_nonstandard_stacks): Define only if
	THREAD_SELF is not defined.
	(pthread_allocate_stack): Always initialize gardaddr to a correct
	value.
	(pthread_handle_create): Unmap thread with one call.
	(pthread_free): Remove test for initial thread before removing stack.
	Unmap stack with one call.

	* pthread.c (__pthread_initial_thread): Initialize p_userstack to
	1 to avoid removing the stack.
This commit is contained in:
Ulrich Drepper 2000-08-05 03:10:51 +00:00
parent 21b2be883c
commit 0a8d92310f
3 changed files with 44 additions and 28 deletions
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13
linuxthreads/ChangeLog
View File

@ -1,3 +1,16 @@
2000-08-04 Ulrich Drepper <drepper@redhat.com>
* manager.c (__pthread_nonstandard_stacks): Define only if
THREAD_SELF is not defined.
(pthread_allocate_stack): Always initialize gardaddr to a correct
value.
(pthread_handle_create): Unmap thread with one call.
(pthread_free): Remove test for initial thread before removing stack.
Unmap stack with one call.
* pthread.c (__pthread_initial_thread): Initialize p_userstack to
1 to avoid removing the stack.
2000-07-27 Jes Sorensen <jes@linuxcare.com>
* linuxthreads/sysdeps/ia64/pspinlock.c (__pthread_spin_lock): Add

57
linuxthreads/manager.c
View File

@ -41,9 +41,11 @@ struct pthread_handle_struct __pthread_handles[PTHREAD_THREADS_MAX] =
/* For debugging purposes put the maximum number of threads in a variable. */
const int __linuxthreads_pthread_threads_max = PTHREAD_THREADS_MAX;
#ifndef THREAD_SELF
/* Indicate whether at least one thread has a user-defined stack (if 1),
or if all threads have stacks supplied by LinuxThreads (if 0). */
int __pthread_nonstandard_stacks;
#endif
/* Number of active entries in __pthread_handles (used by gdb) */
volatile int __pthread_handles_num = 2;
@ -319,9 +321,11 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
new_thread =
(pthread_descr) ((long)(attr->__stackaddr) & -sizeof(void *)) - 1;
new_thread_bottom = (char *) attr->__stackaddr - attr->__stacksize;
guardaddr = NULL;
guardaddr = new_thread_bottom;
guardsize = 0;
#ifndef THREAD_SELF
__pthread_nonstandard_stacks = 1;
#endif
}
else
{
@ -331,6 +335,8 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
#else
size_t granularity = pagesize;
#endif
void *map_addr;
/* Allocate space for stack and thread descriptor at default address */
if (attr != NULL)
{
@ -344,8 +350,8 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
guardsize = granularity;
stacksize = STACK_SIZE - granularity;
}
new_thread = default_new_thread;
#ifdef NEED_SEPARATE_REGISTER_STACK
new_thread = default_new_thread;
new_thread_bottom = (char *) (new_thread + 1) - stacksize - guardsize;
/* Includes guard area, unlike the normal case. Use the bottom
end of the segment as backing store for the register stack.
@ -376,11 +382,12 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
guardaddr = new_thread_bottom + stacksize/2;
/* We leave the guard area in the middle unmapped. */
#else /* !NEED_SEPARATE_REGISTER_STACK */
new_thread = default_new_thread;
new_thread_bottom = (char *) (new_thread + 1) - stacksize;
if (mmap((caddr_t)((char *)(new_thread + 1) - INITIAL_STACK_SIZE),
INITIAL_STACK_SIZE, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED | MAP_GROWSDOWN,
-1, 0) == MAP_FAILED)
map_addr = mmap((caddr_t)((char *)(new_thread + 1) - stacksize),
stacksize, PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
if (map_addr == MAP_FAILED)
/* Bad luck, this segment is already mapped. */
return -1;
/* We manage to get a stack. Now see whether we need a guard
@ -391,7 +398,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
if (stacksize == STACK_SIZE - pagesize)
{
/* We don't need a guard page. */
guardaddr = NULL;
guardaddr = new_thread_bottom;
guardsize = 0;
}
else
@ -402,7 +409,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
== MAP_FAILED)
{
/* We don't make this an error. */
guardaddr = NULL;
guardaddr = new_thread_bottom;
guardsize = 0;
}
}
@ -445,7 +452,8 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
return EAGAIN;
if (__pthread_handles[sseg].h_descr != NULL)
continue;
if (pthread_allocate_stack(attr, thread_segment(sseg), pagesize,
if (pthread_allocate_stack(attr, thread_segment(sseg),
pagesize,
&new_thread, &new_thread_bottom,
&guardaddr, &guardsize) == 0)
break;
@ -589,14 +597,11 @@ static int pthread_handle_create(pthread_t *thread, const pthread_attr_t *attr,
#ifdef NEED_SEPARATE_REGISTER_STACK
size_t stacksize = ((char *)(new_thread->p_guardaddr)
- new_thread_bottom);
munmap((caddr_t)new_thread_bottom, stacksize);
munmap((caddr_t)new_thread_bottom + stacksize
+ new_thread->p_guardsize, stacksize);
munmap((caddr_t)new_thread_bottom,
2 * stacksize + new_thread->p_guardsize);
#else
if (new_thread->p_guardsize != 0)
munmap(new_thread->p_guardaddr, new_thread->p_guardsize);
munmap((caddr_t)((char *)(new_thread+1) - INITIAL_STACK_SIZE),
INITIAL_STACK_SIZE);
size_t stacksize = (char *)(new_thread+1) - new_thread_bottom;
munmap(new_thread_bottom - guardsize, guardsize + stacksize);
#endif
}
__pthread_handles[sseg].h_descr = NULL;
@ -654,7 +659,6 @@ static void pthread_free(pthread_descr th)
}
/* If initial thread, nothing to free */
if (th == &__pthread_initial_thread) return;
if (!th->p_userstack)
{
size_t guardsize = th->p_guardsize;
@ -666,17 +670,16 @@ static void pthread_free(pthread_descr th)
guardsize is 0. This allows us to compute everything else. */
size_t stacksize = (char *)(th+1) - guardaddr - guardsize;
/* Unmap the register stack, which is below guardaddr. */
munmap((caddr_t)(guardaddr-stacksize), stacksize);
/* Unmap the main stack. */
munmap((caddr_t)(guardaddr+guardsize), stacksize);
munmap((caddr_t)(guardaddr-stacksize),
2 * stacksize + th->p_guardsize);
#else
/* The following assumes that we only allocate stacks of one
size. That's currently true but probably shouldn't be. This
looks like it fails for growing stacks if there was something
else mapped just below the stack? */
if (guardsize != 0)
munmap(th->p_guardaddr, guardsize);
munmap((caddr_t) ((char *)(th+1) - STACK_SIZE), STACK_SIZE);
char *guardaddr = th->p_guardaddr;
/* We unmap exactly what we mapped, in case there was something
else in the same region. Guardaddr is always set, eve if
guardsize is 0. This allows us to compute everything else. */
size_t stacksize = (char *)(th+1) - guardaddr - guardsize;
munmap (guardaddr, stacksize + guardsize);
#endif
}
}

2
linuxthreads/pthread.c
View File

@ -80,7 +80,7 @@ struct _pthread_descr_struct __pthread_initial_thread = {
/* struct pthread_start_args p_start_args */
{NULL}, /* void ** p_specific[PTHREAD_KEY_1STLEVEL_SIZE] */
{NULL}, /* void * p_libc_specific[_LIBC_TSD_KEY_N] */
0, /* int p_userstack */
1, /* int p_userstack */
NULL, /* void * p_guardaddr */
0, /* size_t p_guardsize */
0, /* Always index 0 */