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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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25
linuxthreads/pthread.c
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@@ -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();