From 819006a88b9473872fee91135b06f4e23231d97e Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 9 Jun 2012 19:53:29 -0400 Subject: add pthread_attr_setstack interface (and get) i originally omitted these (optional, per POSIX) interfaces because i considered them backwards implementation details. however, someone later brought to my attention a fairly legitimate use case: allocating thread stacks in memory that's setup for sharing and/or fast transfer between CPU and GPU so that the thread can move data to a GPU directly from automatic-storage buffers without having to go through additional buffer copies. perhaps there are other situations in which these interfaces are useful too. --- src/thread/pthread_attr_setstack.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) create mode 100644 src/thread/pthread_attr_setstack.c (limited to 'src/thread/pthread_attr_setstack.c') diff --git a/src/thread/pthread_attr_setstack.c b/src/thread/pthread_attr_setstack.c new file mode 100644 index 00000000..c51ad34d --- /dev/null +++ b/src/thread/pthread_attr_setstack.c @@ -0,0 +1,14 @@ +#include "pthread_impl.h" + +/* pthread_key_create.c overrides this */ +static const size_t dummy = 0; +weak_alias(dummy, __pthread_tsd_size); + +int pthread_attr_setstack(pthread_attr_t *a, void *addr, size_t size) +{ + if (size-PTHREAD_STACK_MIN-__pthread_tsd_size > SIZE_MAX/4) + return EINVAL; + a->_a_stackaddr = (size_t)addr + size; + a->_a_stacksize = size - DEFAULT_STACK_SIZE; + return 0; +} -- cgit v1.2.1