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authorRich Felker <dalias@aerifal.cx>2012-06-09 19:53:29 -0400
committerRich Felker <dalias@aerifal.cx>2012-06-09 19:53:29 -0400
commit819006a88b9473872fee91135b06f4e23231d97e (patch)
treea123767e77980a5feeee0e05a21ea2fe2b2a2b8e /src/thread/pthread_attr_setstack.c
parentf457b1cb0d49f1b47bc7baf4bb516f1860816f03 (diff)
downloadmusl-819006a88b9473872fee91135b06f4e23231d97e.tar.gz
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.
Diffstat (limited to 'src/thread/pthread_attr_setstack.c')
-rw-r--r--src/thread/pthread_attr_setstack.c14
1 files changed, 14 insertions, 0 deletions
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;
+}