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Add signal and fiber/can-resume?.

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These additions, along with the change that user signals 0-4 cannot
be resumed, allow delimited continuation semantics, while repsecting
existing forms like `defer`, `with`, `with-vars`, etc.
This commit is contained in:
Calvin Rose
2020-02-23 13:31:27 -06:00
parent 20d5d560f3
commit 6a13703e32
4 changed files with 61 additions and 7 deletions
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25
src/core/corelib.c
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@@ -489,6 +489,26 @@ ret_false:
return janet_wrap_false();
}
static Janet janet_core_signal(int32_t argc, Janet *argv) {
janet_arity(argc, 1, 2);
int sig;
if (janet_checkint(argv[0])) {
int32_t s = janet_unwrap_integer(argv[0]);
if (s < 0 || s > 9) {
janet_panicf("expected user signal between 0 and 9, got %d", s);
}
sig = JANET_SIGNAL_USER0 + s;
} else {
JanetKeyword kw = janet_getkeyword(argv, 0);
if (!janet_cstrcmp(kw, "yield")) sig = JANET_SIGNAL_YIELD;
if (!janet_cstrcmp(kw, "error")) sig = JANET_SIGNAL_ERROR;
if (!janet_cstrcmp(kw, "debug")) sig = JANET_SIGNAL_DEBUG;
janet_panicf("unknown signal, expected :yield, :error, or :debug, got %v", argv[0]);
}
Janet payload = argc == 2 ? argv[1] : janet_wrap_nil();
janet_signalv(sig, payload);
}
static const JanetReg corelib_cfuns[] = {
{
"native", janet_core_native,
@@ -679,6 +699,11 @@ static const JanetReg corelib_cfuns[] = {
JDOC("(slice x &opt start end)\n\n"
"Extract a sub-range of an indexed data strutrue or byte sequence.")
},
{
"signal", janet_core_signal,
JDOC("(signal what x)\n\n"
"Raise a signal with payload x. ")
},
{NULL, NULL, NULL}
};