diff options
Diffstat (limited to 'lib/libc_r/uthread')
| -rw-r--r-- | lib/libc_r/uthread/uthread_stack.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/lib/libc_r/uthread/uthread_stack.c b/lib/libc_r/uthread/uthread_stack.c index 940f295efd3..43cbf7cc519 100644 --- a/lib/libc_r/uthread/uthread_stack.c +++ b/lib/libc_r/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) |