diff options
| author | Ted Unangst <tedu@cvs.openbsd.org> | 2005-12-21 00:53:29 +0000 |
|---|---|---|
| committer | Ted Unangst <tedu@cvs.openbsd.org> | 2005-12-21 00:53:29 +0000 |
| commit | 0e4fd55dc208bc4388e93e9803a984f9f4e11d12 (patch) | |
| tree | d1cd5c144431ce092906f5cd4965d142a6a83c65 /lib | |
| parent | 37e7e911d7ca49b327a987582e5f4cce44a4f14b (diff) | |
make alloc_stack take an optional base, preparation for stack attributes
deal with machines that have upside down stacks
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/librthread/rthread.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/lib/librthread/rthread.c b/lib/librthread/rthread.c index e4218e7bd3f..98988c63ab4 100644 --- a/lib/librthread/rthread.c +++ b/lib/librthread/rthread.c @@ -1,4 +1,4 @@ -/* $OpenBSD: rthread.c,v 1.12 2005/12/21 00:49:07 tedu Exp $ */ +/* $OpenBSD: rthread.c,v 1.13 2005/12/21 00:53:28 tedu Exp $ */ /* * Copyright (c) 2004,2005 Ted Unangst <tedu@openbsd.org> * All Rights Reserved. @@ -115,19 +115,28 @@ thread_init(void) } static struct stack * -alloc_stack(size_t len) +alloc_stack(size_t len, void *base) { struct stack *stack; stack = malloc(sizeof(*stack)); if (!stack) return (NULL); - stack->base = mmap(NULL, len, PROT_READ | PROT_WRITE, MAP_ANON, -1, 0); - if (stack->base == MAP_FAILED) { - free(stack); - return (NULL); + if (base) { + stack->base = base; + } else { + stack->base = mmap(NULL, len, PROT_READ | PROT_WRITE, + MAP_ANON, -1, 0); + if (stack->base == MAP_FAILED) { + free(stack); + return (NULL); + } } +#ifdef MACHINE_STACK_GROWS_UP + stack->sp = (void *)(((size_t)stack->base + 16) & ~15); +#else stack->sp = (void *)(((size_t)stack->base + len - 16) & ~15); +#endif stack->len = len; return (stack); } @@ -222,7 +231,7 @@ pthread_create(pthread_t *threadp, const pthread_attr_t *attr, if (!thread) return (errno); memset(thread, 0, sizeof(*thread)); - thread->stack = alloc_stack(64 * 1024); + thread->stack = alloc_stack(64 * 1024, NULL); if (!thread->stack) { rc = errno; goto fail1; |