Really use user-provided stack

* pthread/pt-create.c (__pthread_create_internal): When the user provides a
`stackaddr`, use it instead of allocating a stack.
* pthread/pt-detach.c (pthread_detach): Only deallocate the stack when it
was allocated by libpthread.
* pthread/pt-join.c (pthread_join): Likewise.

1 files changed, 12 insertions, 6 deletions

diff --git a/pthread/pt-create.c b/pthread/pt-create.c
index 723aa81..fd6800f 100644
--- a/pthread/pt-create.c
+++ b/pthread/pt-create.c
@@ -129,13 +129,19 @@ __pthread_create_internal (struct __pthread **thread,
     }
   else
     {
-      err = __pthread_stack_alloc (&pthread->stackaddr,
-				   setup->stacksize);
-      if (err)
-	goto failed_stack_alloc;
-
       pthread->stacksize = setup->stacksize;
-      pthread->stack = 1;
+
+      if (setup->stackaddr)
+	pthread->stackaddr = setup->stackaddr;
+      else
+	{
+	  err = __pthread_stack_alloc (&pthread->stackaddr,
+				       setup->stacksize);
+	  if (err)
+	    goto failed_stack_alloc;
+
+	  pthread->stack = 1;
+	}
     }
 
   /* Allocate the kernel thread and other required resources.  */