pthread_attr_setstack, pthread_attr_getstack — set/get stack attributes in thread attributes object
||const pthread_attr_t *attr,|
Compile and link with
function sets the stack address and stack size attributes of
the thread attributes object referred to by
attr to the values specified in
respectively. These attributes specify the location and size
of the stack that should be used by a thread that is created
using the thread attributes object
point to the lowest addressable byte of a buffer of
stacksize bytes that
was allocated by the caller. The pages of the allocated
buffer should be both readable and writable.
function returns the stack address and stack size attributes
of the thread attributes object referred to by
attr in the buffers pointed to
fail with the following error:
PTHREAD_STACK_MIN (16384) bytes. On
some systems, this error may also occur if
stackaddr or stackaddr + stacksize is not
POSIX.1 also documents an EACCES error if the stack area described
stacksize is not both
readable and writable by the caller.
For an explanation of the terms used in this section, see attributes(7).
These functions are provided for applications that must ensure that a thread's stack is placed in a particular location. For most applications, this is not necessary, and the use of these functions should be avoided. (Use pthread_attr_setstacksize(3) if an application simply requires a stack size other than the default.)
When an application employs
pthread_attr_setstack(), it takes over the
responsibility of allocating the stack. Any guard size value
that was set using pthread_attr_setguardsize(3)
is ignored. If deemed necessary, it is the application's
responsibility to allocate a guard area (one or more pages
protected against reading and writing) to handle the
possibility of stack overflow.
The address specified in
stackaddr should be suitably
aligned: for full portability, align it on a page boundary
posix_memalign(3) may be
useful for allocation. Probably,
stacksize should also be a
multiple of the system page size.
attr is used to
create multiple threads, then the caller must change the
stack address attribute between calls to pthread_create(3);
otherwise, the threads will attempt to use the same memory
area for their stacks, and chaos will ensue.
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