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* internals.h: Declare __pthread_max_stacksize.
	* pthread.c (__pthread_max_stacksize): New variable.
	(__pthread_initialize_manager): Determine __pthread_initialize_manager
	value.
	* manager.c (thread_segment): Return always NULL if FLOATING_STACKS.
	(pthread_allocate_stack): Allow kernel to choose stack address if
	FLOATING_STACKS.  This also handles variable-sized stacks.
	Always allocate stack and guardoage together.  Use mprotect to
	change guardpage access.
	* sysdeps/i386/useldt.h: Define FLOATING_STACKS and
	ARCH_STACK_MAX_SIZE.

	* attr.c (__pthread_attr_setstacksize): Also test value against
	upper limit.
This commit is contained in:
Ulrich Drepper 2000-08-05 06:15:04 +00:00
parent 0a8d92310f
commit 234dd7a6ba
6 changed files with 133 additions and 34 deletions
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15
linuxthreads/ChangeLog
View File

@ -1,5 +1,20 @@
2000-08-04 Ulrich Drepper <drepper@redhat.com>
* internals.h: Declare __pthread_max_stacksize.
* pthread.c (__pthread_max_stacksize): New variable.
(__pthread_initialize_manager): Determine __pthread_initialize_manager
value.
* manager.c (thread_segment): Return always NULL if FLOATING_STACKS.
(pthread_allocate_stack): Allow kernel to choose stack address if
FLOATING_STACKS. This also handles variable-sized stacks.
Always allocate stack and guardoage together. Use mprotect to
change guardpage access.
* sysdeps/i386/useldt.h: Define FLOATING_STACKS and
ARCH_STACK_MAX_SIZE.
* attr.c (__pthread_attr_setstacksize): Also test value against
upper limit.
* manager.c (__pthread_nonstandard_stacks): Define only if
THREAD_SELF is not defined.
(pthread_allocate_stack): Always initialize gardaddr to a correct

25
linuxthreads/attr.c
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@ -18,6 +18,7 @@
#include <string.h>
#include <unistd.h>
#include <sys/param.h>
#include <sys/resource.h>
#include "pthread.h"
#include "internals.h"
#include <shlib-compat.h>
@ -184,6 +185,30 @@ weak_alias (__pthread_attr_getstackaddr, pthread_attr_getstackaddr)
int __pthread_attr_setstacksize(pthread_attr_t *attr, size_t stacksize)
{
#ifdef FLOATING_STACKS
/* We have to check against the maximum allowed stack size. This is no
problem if the manager is already started and we determined it. If
this hasn't happened, we have to find the limit outself. */
if (__pthread_max_stacksize == 0)
{
struct rlimit limit;
getrlimit(RLIMIT_STACK, &limit);
# ifdef NEED_SEPARATE_REGISTER_STACK
__pthread_max_stacksize = limit.rlim_max / 2;
# else
__pthread_max_stacksize = limit.rlim_max;
# endif
}
if (stacksize > __pthread_max_stacksize)
return EINVAL;
#else
/* We have a fixed size limit. */
if (stacksize > STACK_SIZE)
return EINVAL;
#endif
/* We don't accept value smaller than PTHREAD_STACK_MIN. */
if (stacksize < PTHREAD_STACK_MIN)
return EINVAL;

5
linuxthreads/internals.h
View File

@ -272,6 +272,11 @@ extern int __pthread_manager_reader;
extern char *__pthread_manager_thread_bos;
extern char *__pthread_manager_thread_tos;
#ifdef FLOATING_STACKS
/* Maximum stack size. */
extern size_t __pthread_max_stacksize;
#endif
/* Pending request for a process-wide exit */
extern int __pthread_exit_requested, __pthread_exit_code;

91
linuxthreads/manager.c
View File

@ -64,25 +64,29 @@ volatile pthread_descr __pthread_last_event;
/* Stack segment numbers are also indices into the __pthread_handles array. */
/* Stack segment number 0 is reserved for the initial thread. */
#if FLOATING_STACKS
# define thread_segment(seq) NULL
#else
static inline pthread_descr thread_segment(int seg)
{
return (pthread_descr)(THREAD_STACK_START_ADDRESS - (seg - 1) * STACK_SIZE)
- 1;
}
#endif
/* Flag set in signal handler to record child termination */
static volatile int terminated_children = 0;
static volatile int terminated_children;
/* Flag set when the initial thread is blocked on pthread_exit waiting
for all other threads to terminate */
static int main_thread_exiting = 0;
static int main_thread_exiting;
/* Counter used to generate unique thread identifier.
Thread identifier is pthread_threads_counter + segment. */
static pthread_t pthread_threads_counter = 0;
static pthread_t pthread_threads_counter;
#ifdef NEED_SEPARATE_REGISTER_STACK
/* Signal masks for the manager. These have to be global only when clone2
@ -338,6 +342,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
void *map_addr;
/* Allocate space for stack and thread descriptor at default address */
#ifdef NEED_SEPARATE_REGISTER_STACK
if (attr != NULL)
{
guardsize = page_roundup (attr->__guardsize, granularity);
@ -350,7 +355,7 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
guardsize = granularity;
stacksize = STACK_SIZE - granularity;
}
#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
@ -361,6 +366,8 @@ static int pthread_allocate_stack(const pthread_attr_t *attr,
in the same region. The cost is that we might be able to map
slightly fewer stacks. */
/* XXX Fix for floating stacks with variable sizes. */
/* First the main stack: */
if (mmap((caddr_t)((char *)(new_thread + 1) - stacksize / 2),
stacksize / 2, PROT_READ | PROT_WRITE | PROT_EXEC,
@ -382,37 +389,63 @@ 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 */
# if FLOATING_STACKS
if (attr != NULL)
{
guardsize = page_roundup (attr->__guardsize, granularity);
stacksize = __pthread_max_stacksize - guardsize;
stacksize = MIN (stacksize,
page_roundup (attr->__stacksize, granularity));
}
else
{
guardsize = granularity;
stacksize = __pthread_max_stacksize - guardsize;
}
map_addr = mmap(NULL, stacksize + guardsize,
PROT_READ | PROT_WRITE | PROT_EXEC,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (map_addr == MAP_FAILED)
/* No more memory available. */
return -1;
guardaddr = map_addr;
if (guardsize > 0)
mprotect (guardaddr, guardsize, PROT_NONE);
new_thread_bottom = (char *) map_addr + guardsize;
new_thread = ((pthread_descr) (new_thread_bottom + stacksize)) - 1;
# else
if (attr != NULL)
{
guardsize = page_roundup (attr->__guardsize, granularity);
stacksize = STACK_SIZE - guardsize;
stacksize = MIN (stacksize,
page_roundup (attr->__stacksize, granularity));
}
else
{
guardsize = granularity;
stacksize = STACK_SIZE - granularity;
}
new_thread = default_new_thread;
new_thread_bottom = (char *) (new_thread + 1) - stacksize;
map_addr = mmap((caddr_t)((char *)(new_thread + 1) - stacksize),
stacksize, PROT_READ | PROT_WRITE | PROT_EXEC,
map_addr = mmap((caddr_t)((char *)(new_thread + 1) - stacksize - guardsize),
stacksize + guardsize,
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
and allocate it if necessary. Notice that the default
attributes (stack_size = STACK_SIZE - pagesize and guardsize
= pagesize) do not need a guard page, since the RLIMIT_STACK
soft limit prevents stacks from running into one another. */
if (stacksize == STACK_SIZE - pagesize)
{
/* We don't need a guard page. */
guardaddr = new_thread_bottom;
guardsize = 0;
}
else
{
/* Put a bad page at the bottom of the stack */
guardaddr = (void *)new_thread_bottom - guardsize;
if (mmap ((caddr_t) guardaddr, guardsize, 0, MAP_FIXED, -1, 0)
== MAP_FAILED)
{
/* We don't make this an error. */
guardaddr = new_thread_bottom;
guardsize = 0;
}
}
/* We manage to get a stack. Protect the guard area pages if
necessary. */
guardaddr = map_addr;
if (guardsize > 0)
mprotect (guardaddr, guardsize, PROT_NONE);
# endif
#endif /* !NEED_SEPARATE_REGISTER_STACK */
}
/* Clear the thread data structure. */

25
linuxthreads/pthread.c
View File

@ -182,6 +182,9 @@ char *__pthread_manager_thread_tos;
int __pthread_exit_requested;
int __pthread_exit_code;
/* Maximum stack size. */
size_t __pthread_max_stacksize;
/* Nozero if the machine has more than one processor. */
int __pthread_smp_kernel;
@ -455,20 +458,32 @@ int __pthread_initialize_manager(void)
struct rlimit limit;
int max_stack;
getrlimit(RLIMIT_STACK, &limit);
#ifdef FLOATING_STACKS
if (limit.rlim_cur == RLIM_INFINITY)
limit.rlim_cur = ARCH_STACK_MAX_SIZE;
# ifdef NEED_SEPARATE_REGISTER_STACK
max_stack = limit.rlim_cur / 2;
# else
max_stack = limit.rlim_cur;
#endif
__pthread_max_stacksize = max_stack;
#else
/* Play with the stack size limit to make sure that no stack ever grows
beyond STACK_SIZE minus one page (to act as a guard page). */
getrlimit(RLIMIT_STACK, &limit);
#ifdef NEED_SEPARATE_REGISTER_STACK
# ifdef NEED_SEPARATE_REGISTER_STACK
/* STACK_SIZE bytes hold both the main stack and register backing
store. The rlimit value applies to each individually. */
max_stack = STACK_SIZE/2 - __getpagesize();
#else
max_stack = STACK_SIZE/2 - __getpagesize ();
# else
max_stack = STACK_SIZE - __getpagesize();
#endif
# endif
if (limit.rlim_cur > max_stack) {
limit.rlim_cur = max_stack;
setrlimit(RLIMIT_STACK, &limit);
}
#endif
/* If basic initialization not done yet (e.g. we're called from a
constructor run before our constructor), do it now */
if (__pthread_initial_thread_bos == NULL) pthread_initialize();

6
linuxthreads/sysdeps/i386/useldt.h
View File

@ -169,3 +169,9 @@ extern int __modify_ldt (int, struct modify_ldt_ldt_s *, size_t);
member))); \
} \
})
/* We want the OS to assign stack addresses. */
#define FLOATING_STACKS 1
/* Maximum size o fthe stack if the rlimit is unlimited. */
#define ARCH_STACK_MAX_SIZE 8*1024*1024