add option: flush stdout

Added the option to forcefully flush STDOUT, which may be useful when running the miner through a pipe instead than a shell.
If STDOUT is a shell, it's unbuffered by default.
If STDOUT is a pipe, it's buffered by default.

2 files changed, 8 insertions, 0 deletions

diff --git a/xmrstak/misc/console.cpp b/xmrstak/misc/console.cpp
index ba34bb3..ce63bcb 100644
--- a/xmrstak/misc/console.cpp
+++ b/xmrstak/misc/console.cpp
@@ -156,6 +156,7 @@ printer::printer()
 {
 	verbose_level = LINF;
 	logfile = nullptr;
+	b_flush_stdout = false;
 }
 
 bool printer::open_logfile(const char* file)
@@ -193,6 +194,11 @@ void printer::print_msg(verbosity verbose, const char* fmt, ...)
 	std::unique_lock<std::mutex> lck(print_mutex);
 	fputs(buf, stdout);
 
+	if (b_flush_stdout)
+	{
+		fflush(stdout);
+	}
+
 	if(logfile != nullptr)
 	{
 		fputs(buf, logfile);
diff --git a/xmrstak/misc/console.hpp b/xmrstak/misc/console.hpp
index 4d5be78..97e86bd 100644
--- a/xmrstak/misc/console.hpp
+++ b/xmrstak/misc/console.hpp
@@ -35,6 +35,7 @@ public:
 	};
 
 	inline void set_verbose_level(size_t level) { verbose_level = (verbosity)level; }
+	inline void set_flush_stdout(bool status) { b_flush_stdout = status; }
 	void print_msg(verbosity verbose, const char* fmt, ...);
 	void print_str(const char* str);
 	bool open_logfile(const char* file);
@@ -44,6 +45,7 @@ private:
 
 	std::mutex print_mutex;
 	verbosity verbose_level;
+	bool b_flush_stdout;
 	FILE* logfile;
 };