Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/src/boost/libs/context/example/fiber/backtrace.cpp b/src/boost/libs/context/example/fiber/backtrace.cpp
new file mode 100644
index 000000000..42c739bba
--- /dev/null
+++ b/src/boost/libs/context/example/fiber/backtrace.cpp
@@ -0,0 +1,57 @@
+
+//          Copyright Oliver Kowalke 2016.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+
+#define UNW_LOCAL_ONLY
+
+#include <cstdlib>
+#include <iostream>
+
+#include <libunwind.h>
+
+#include <boost/context/fiber.hpp>
+
+namespace ctx = boost::context;
+
+void backtrace() {
+	unw_cursor_t cursor;
+	unw_context_t context;
+	unw_getcontext( & context);
+	unw_init_local( & cursor, & context);
+	while ( 0 < unw_step( & cursor) ) {
+		unw_word_t offset, pc;
+		unw_get_reg( & cursor, UNW_REG_IP, & pc);
+		if ( 0 == pc) {
+			break;
+		}
+		std::cout << "0x" << pc << ":";
+
+		char sym[256];
+		if ( 0 == unw_get_proc_name( & cursor, sym, sizeof( sym), & offset) ) {
+			std::cout << " (" << sym << "+0x" << offset << ")" << std::endl;
+		} else {
+			std::cout << " -- error: unable to obtain symbol name for this frame" << std::endl;
+		}
+	}
+}
+
+void bar() {
+	backtrace();
+}
+
+void foo() {
+	bar();
+}
+
+ctx::fiber f1( ctx::fiber && c) {
+    foo();
+    return std::move( c);
+}
+
+int main() {
+    ctx::fiber{ f1 }.resume();
+    std::cout << "main: done" << std::endl;
+    return EXIT_SUCCESS;
+}