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Begin adding support for multiple lightweight threads.

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Can be used to implement coroutines, error handling,
and more.
This commit is contained in:
Calvin Rose 2017-05-08 17:07:16 -04:00
parent 6246c43e22
commit 8aa99556e7
1 changed files with 30 additions and 0 deletions
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30
core/stl.c
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@ -399,6 +399,34 @@ int gst_stl_string(Gst *vm) {
gst_c_return(vm, gst_wrap_string(gst_string_end(vm, str)));
}
/* Create a thread */
int gst_stl_thread(Gst *vm) {
GstThread *t;
GstValue callee = gst_arg(vm, 0);
if (callee.type != GST_FUNCTION && callee.type != GST_CFUNCTION)
gst_c_throwc(vm, "expected function");
t = gst_thread(vm, callee, 10);
t->parent = vm->thread;
gst_c_return(vm, gst_wrap_thread(t));
}
/* Transfer to a new thread */
int gst_stl_transfer(Gst *vm) {
GstThread *t;
GstValue ret = gst_arg(vm, 1);
if (!gst_check_thread(vm, 0, &t))
gst_c_throwc(vm, "expected thread");
if (t->status == GST_THREAD_DEAD)
gst_c_throwc(vm, "cannot transfer to dead thread");
if (t->status == GST_THREAD_ALIVE)
gst_c_throwc(vm, "cannot transfer to current thread");
gst_thread_beginframe(vm, t, gst_wrap_nil(), 0);
vm->thread->status = GST_THREAD_PENDING;
t->status = GST_THREAD_ALIVE;
vm->thread = t;
gst_c_return(vm, ret);
}
/* Associative get */
int gst_stl_get(Gst *vm) {
GstValue ret;
@ -810,6 +838,8 @@ static const GstModuleItem const std_module[] = {
{"struct", gst_stl_struct},
{"buffer", gst_stl_buffer},
{"string", gst_stl_string},
{"thread", gst_stl_thread},
{"transfer", gst_stl_transfer},
{"print", gst_stl_print},
{"tostring", gst_stl_tostring},
{"exit", gst_stl_exit},