2 * support for dynamic binding from C
6 * This software is part of the SBCL system. See the README file for
9 * This software is derived from the CMU CL system, which was
10 * written at Carnegie Mellon University and released into the
11 * public domain. The software is in the public domain and is
12 * provided with absolutely no warranty. See the COPYING and CREDITS
13 * files for more information.
24 #include "pseudo-atomic.h"
25 #include "genesis/symbol.h"
26 #include "genesis/binding.h"
27 #include "genesis/thread.h"
28 #include "genesis/static-symbols.h"
30 #if defined(BINDING_STACK_POINTER)
31 #define GetBSP() ((struct binding *)SymbolValue(BINDING_STACK_POINTER,thread))
32 #define SetBSP(value) SetSymbolValue(BINDING_STACK_POINTER, (lispobj)(value),thread)
34 #define GetBSP() ((struct binding *)current_binding_stack_pointer)
35 #define SetBSP(value) (current_binding_stack_pointer=(lispobj *)(value))
38 void bind_variable(lispobj symbol
, lispobj value
, void *th
)
40 struct binding
*binding
;
41 struct thread
*thread
=(struct thread
*)th
;
44 #ifdef LISP_FEATURE_SB_THREAD
46 struct symbol
*sym
=(struct symbol
*)native_pointer(symbol
);
48 lispobj
*tls_index_lock
=
49 &((struct symbol
*)native_pointer(TLS_INDEX_LOCK
))->value
;
50 FSHOW_SIGNAL((stderr
, "entering dynbind tls alloc\n"));
51 set_pseudo_atomic_atomic(th
);
52 get_spinlock(tls_index_lock
,(long)th
);
54 sym
->tls_index
=SymbolValue(FREE_TLS_INDEX
,0);
55 SetSymbolValue(FREE_TLS_INDEX
,
56 make_fixnum(fixnum_value(sym
->tls_index
)+1),0);
57 if(fixnum_value(sym
->tls_index
)>=TLS_SIZE
) {
58 lose("Thread local storage exhausted.");
61 release_spinlock(tls_index_lock
);
62 FSHOW_SIGNAL((stderr
, "exiting dynbind tls alloc\n"));
63 clear_pseudo_atomic_atomic(th
);
64 if (get_pseudo_atomic_interrupted(th
))
65 do_pending_interrupt();
69 binding
->value
= SymbolTlValue(symbol
, thread
);
70 binding
->symbol
= symbol
;
71 SetTlSymbolValue(symbol
, value
, thread
);
77 struct thread
*thread
=(struct thread
*)th
;
78 struct binding
*binding
;
81 binding
= GetBSP() - 1;
83 symbol
= binding
->symbol
;
85 SetTlSymbolValue(symbol
, binding
->value
,thread
);
94 unbind_to_here(lispobj
*bsp
,void *th
)
96 struct thread
*thread
=(struct thread
*)th
;
97 struct binding
*target
= (struct binding
*)bsp
;
98 struct binding
*binding
= GetBSP();
101 while (target
< binding
) {
104 symbol
= binding
->symbol
;
106 if (symbol
!= UNBOUND_MARKER_WIDETAG
) {
107 SetTlSymbolValue(symbol
, binding
->value
,thread
);