diff options
Diffstat (limited to 'linuxthreads/manager.c')
| -rw-r--r-- | linuxthreads/manager.c | 46 |
1 files changed, 31 insertions, 15 deletions
diff --git a/linuxthreads/manager.c b/linuxthreads/manager.c index 8442629c08..c48ce76c55 100644 --- a/linuxthreads/manager.c +++ b/linuxthreads/manager.c @@ -345,6 +345,8 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, /* Allocate space for stack and thread descriptor at default address */ #ifdef NEED_SEPARATE_REGISTER_STACK + void *res_addr; + if (attr != NULL) { guardsize = page_roundup (attr->__guardsize, granularity); @@ -371,18 +373,26 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, /* 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, - MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0) - == MAP_FAILED) - /* Bad luck, this segment is already mapped. */ - return -1; + map_addr = (caddr_t)((char *)(new_thread + 1) - stacksize / 2); + res_addr = mmap(map_addr, stacksize / 2, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); + if (res_addr != map_addr) + { + /* Bad luck, this segment is already mapped. */ + if (res_addr != MAP_FAILED) + munmap(res_addr, stacksize / 2); + return -1; + } /* Then the register stack: */ - if (mmap((caddr_t)new_thread_bottom, stacksize/2, - PROT_READ | PROT_WRITE | PROT_EXEC, - MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0) - == MAP_FAILED) + map_addr = (caddr_t)new_thread_bottom; + res_addr = mmap(map_addr, stacksize/2, + PROT_READ | PROT_WRITE | PROT_EXEC, + MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXES, -1, 0); + if (res_addr != map_addr) { + if (res_addr != MAP_FAILED) + munmap(res_addr, stacksize / 2); munmap((caddr_t)((char *)(new_thread + 1) - stacksize/2), stacksize/2); return -1; @@ -419,6 +429,8 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, new_thread_bottom = (char *) map_addr + guardsize; new_thread = ((pthread_descr) (new_thread_bottom + stacksize)) - 1; # else /* !FLOATING_STACKS */ + void *res_addr; + if (attr != NULL) { guardsize = page_roundup (attr->__guardsize, granularity); @@ -434,13 +446,17 @@ static int pthread_allocate_stack(const pthread_attr_t *attr, new_thread = default_new_thread; new_thread_bottom = (char *) (new_thread + 1) - stacksize; - map_addr = mmap((caddr_t)((char *)(new_thread + 1) - stacksize - guardsize), - stacksize + guardsize, + map_addr = new_thread_bottom - guardsize; + res_addr = mmap(map_addr, 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; + if (res_addr != map_addr) + { + /* Bad luck, this segment is already mapped. */ + if (res_addr != MAP_FAILED) + munmap (res_addr, stacksize + guardsize); + return -1; + } /* We manage to get a stack. Protect the guard area pages if necessary. */ |