How is this tackled in the glibc/Linux support? Is the exact layout of
the structures really interesting for Ada? I guess its sufficient to
tell Ada the size and alignment of pthread_attr_t for example.
On 29/10/15 22:10, Jan Sommer wrote:
_NCPUWORDS is defined in newlib in newlib/libc/sys/rtems/sys/cpuset.h and used
to define the type cpu_set_t there.
typedef struct _cpuset {
cpu_set_word_t __bits[_NCPUWORDS];
} cpu_set_t;
cpu_set_t is used for a field in the struct pthread_attr_t in file
newlib/libc/include/types.h
The Gnat Ada runtime uses POSIX-threads for tasking, therefore the
pthread-types have to be declared in Ada in order to import them.
As the fixed size array in cpu_set_t depends on the value of _NCPUWORDS it is
exported with the symbol _ada_ncpuwords in order to access it from within the
Ada runtime.
The Ada declaration of pthread_attr_t is located in gcc/ada/s-osinte-rtems.ads
and _ada_ncpuwords is imported there.
---
cpukit/libgnat/adasupp.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/cpukit/libgnat/adasupp.c b/cpukit/libgnat/adasupp.c
index 662b1cc..cde36b6 100644
--- a/cpukit/libgnat/adasupp.c
+++ b/cpukit/libgnat/adasupp.c
@@ -10,6 +10,10 @@
#include <rtems/posix/pthreadimpl.h>
#include <rtems/score/stackimpl.h>
+
+/* export _NCPUWORDS for Ada */
+const size_t _ada_ncpuwords = _NCPUWORDS - 1;
+
/*
* _ada_pthread_minimum_stack_size
*
--
Sebastian Huber, embedded brains GmbH
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