70 lines
2.1 KiB
OCaml
70 lines
2.1 KiB
OCaml
external mycallback1 : ('a -> 'b) -> 'a -> 'b = "mycallback1"
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external mycallback2 : ('a -> 'b -> 'c) -> 'a -> 'b -> 'c = "mycallback2"
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external mycallback3 : ('a -> 'b -> 'c -> 'd) -> 'a -> 'b -> 'c -> 'd = "mycallback3"
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external mycallback4 : ('a -> 'b -> 'c -> 'd -> 'e) -> 'a -> 'b -> 'c -> 'd -> 'e = "mycallback4"
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let rec tak (x, y, z as tuple) =
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if x > y then tak(tak (x-1, y, z), tak (y-1, z, x), tak (z-1, x, y))
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else z
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let tak2 x (y, z) = tak (x, y, z)
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let tak3 x y z = tak (x, y, z)
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let tak4 x y z u = tak (x, y, z + u)
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let raise_exit () = (raise Exit : unit)
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let trapexit () =
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begin try
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mycallback1 raise_exit ()
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with Exit ->
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()
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end;
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tak (18, 12, 6)
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external mypushroot : 'a -> ('b -> 'c) -> 'b -> 'a = "mypushroot"
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external mycamlparam : 'a -> ('b -> 'c) -> 'b -> 'a = "mycamlparam"
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let tripwire f =
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let s = String.make 5 'a' in
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f s trapexit ()
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(* Test callbacks performed to handle signals *)
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let sighandler signo =
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(*
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print_string "Got signal, triggering garbage collection...";
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print_newline();
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*)
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(* Thoroughly wipe the minor heap *)
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tak (18, 12, 6);
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()
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external unix_getpid : unit -> int = "unix_getpid" "noalloc"
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external unix_kill : int -> int -> unit = "unix_kill" "noalloc"
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let callbacksig () =
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let pid = unix_getpid() in
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(* Allocate a block in the minor heap *)
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let s = String.make 5 'b' in
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(* Send a signal to self. We want s to remain in a register and
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not be spilled on the stack, hence we declare unix_kill
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"noalloc". *)
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unix_kill pid Sys.sigusr1;
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(* Allocate some more so that the signal will be tested *)
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let u = (s, s) in
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fst u
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let _ =
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print_int(mycallback1 tak (18, 12, 6)); print_newline();
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print_int(mycallback2 tak2 18 (12, 6)); print_newline();
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print_int(mycallback3 tak3 18 12 6); print_newline();
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print_int(mycallback4 tak4 18 12 3 3); print_newline();
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print_int(trapexit ()); print_newline();
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print_string(tripwire mypushroot); print_newline();
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print_string(tripwire mycamlparam); print_newline();
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Sys.signal Sys.sigusr1 (Sys.Signal_handle sighandler);
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print_string(callbacksig ()); print_newline()
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