ST: Add example for backtrace.

trunk/research/st/backtrace.cpp

@@ -0,0 +1,29 @@
+/*
+g++ backtrace.cpp ../../objs/st/libst.a -g -O0 -o backtrace && ./backtrace
+*/
+#include <stdio.h>
+#include "../../objs/st/st.h"
+
+void* pfn(void* arg) {
+    for (;;) {
+        printf("Hello, coroutine\n");
+        st_sleep(1);
+    }
+    return NULL;
+}
+
+int bar(int argc) {
+    st_thread_create(pfn, NULL, 0, 0);
+    return argc + 1;
+}
+
+int foo(int argc) {
+    return bar(argc);
+}
+
+int main(int argc, char** argv) {
+    st_init();
+    foo(argc);
+    st_thread_exit(NULL);
+    return 0;
+}