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-rw-r--r--lib/libpthread/uthread/uthread_stack.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/lib/libpthread/uthread/uthread_stack.c b/lib/libpthread/uthread/uthread_stack.c
index 940f295efd3..43cbf7cc519 100644
--- a/lib/libpthread/uthread/uthread_stack.c
+++ b/lib/libpthread/uthread/uthread_stack.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: uthread_stack.c,v 1.1 1999/11/25 07:01:46 d Exp $ */
+/* $OpenBSD: uthread_stack.c,v 1.2 1999/11/25 19:00:19 deraadt Exp $ */
/*
* Thread stack allocation.
@@ -25,6 +25,7 @@ _thread_stack_alloc(base, size)
size_t size;
{
struct stack *stack;
+ int nbpg = getpagesize();
/* Maintain a queue of default-sized stacks that we can re-use. */
if (size == PTHREAD_STACK_DEFAULT) {
@@ -56,20 +57,20 @@ _thread_stack_alloc(base, size)
}
/* Allocate some storage for the stack, with some overhead: */
- stack->storage = malloc(size + NBPG * 2);
+ stack->storage = malloc(size + nbpg * 2);
if (stack->storage == NULL) {
free(stack);
return NULL;
}
/* The red zone is the first physical page of the storage: */
- stack->redzone = (void*)(((int)stack->storage + NBPG - 1) &
- ~(NBPG - 1));
- if (mprotect(stack->redzone, NBPG, 0) == -1)
+ stack->redzone = (void*)(((int)stack->storage + nbpg - 1) &
+ ~(nbpg - 1));
+ if (mprotect(stack->redzone, nbpg, 0) == -1)
PANIC("Cannot protect stack red zone");
/* Find the useful range of the stack. */
- stack->base = stack->redzone + NBPG;
+ stack->base = stack->redzone + nbpg;
stack->size = size;
return stack;
@@ -79,13 +80,16 @@ void
_thread_stack_free(stack)
struct stack *stack;
{
+ int nbpg = getpagesize();
+
/* Cache allocated stacks of default size. */
if (stack->storage != NULL && stack->size == PTHREAD_STACK_DEFAULT)
SLIST_INSERT_HEAD(&_stackq, stack, qe);
else {
/* Restore storage protection to what malloc expects: */
if (stack->redzone)
- mprotect(stack->redzone, NBPG, PROT_READ|PROT_WRITE);
+ mprotect(stack->redzone, nbpg,
+ PROT_READ|PROT_WRITE);
/* Free storage */
if (stack->storage)