fix progress bar deadlock

client.c

@@ -419,6 +419,7 @@ int main(int argc, const char *argv[]){
 
     init_bench_data();
     if(parse_arg(argc,argv) < 0) return EXIT_FAILURE;
+    ready_progress_bar();
 
     err = getsockaddrbyname(AF_INET,SOCK_STREAM,0,cmd_args.server_name,(struct sockaddr *)&addr);
     if (err != 0){
@@ -480,6 +481,6 @@ int main(int argc, const char *argv[]){
         fprintf(stdout,"operation: %lf us/op\n",avg / 1000.0);
         fprintf(stdout,"resolution: %ld sec %ld ns\n",bench.resolution.tv_sec,bench.resolution.tv_nsec);
     }
-    
+    quit_progress_bar();
     return retval;
 }

display_bar.c

@@ -6,6 +6,9 @@
 #include<unistd.h>
 #include<termio.h>
 #include<pthread.h>
+#include<stdlib.h>
+#include<unistd.h>
+#include<fcntl.h>
 
 #include "display_bar.h"
 #include "timerhelper.h"
@@ -25,15 +28,34 @@ enum{
 
 static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 static raw_progress_bar_t scrolled = 1;
+static int tty_fd = STDIN_FILENO;
+#ifdef DEBUG
+static int deadlock = 0;
+#endif
 
 void ready_progress_bar(){
     fflush(stdout);
+    if(!isatty(STDIN_FILENO)){
+        char * buf = ctermid(NULL);
+        tty_fd = open(buf,O_RDONLY);
+    }
 }
 
 void lock_scrolled(){
+#ifdef DEBUG
+    deadlock++;
+    if (deadlock > 1)
+    {
+        fprintf(stderr,"deadlock occur\n");
+        exit(EXIT_FAILURE);
+    }
+#endif
     pthread_mutex_lock(&mutex);
 }
 void unlock_scrolled(){
+#ifdef DEBUG
+    deadlock--;
+#endif
     pthread_mutex_unlock(&mutex);
 }
 
@@ -75,7 +97,10 @@ void RawDisplayProgressBar(raw_progress_bar_t bar,size_t offset,size_t total,con
     }//optimization.
     //if ioctl failed? what should i do...
     ioctl(STDIN_FILENO,TIOCGWINSZ,(char *)&wnd_size);
-    if (wnd_size.ws_row < pos) return;
+    if (wnd_size.ws_row < pos){
+        unlock_scrolled();
+        return;
+    }
     fprintf(stdout,"\x1b[%dA[%s]: %.2f%% %s bytes: %ld/%ld \x1b[%dB\r",pos,buf,cur_progress,filename,total,offset,pos);
     fflush(stdout);
     unlock_scrolled();
@@ -116,3 +141,9 @@ void DisplayProgressBar(progress_bar_t * bar,size_t offset,size_t total,const ch
     bar->last_update = ts;
     RawDisplayProgressBar(bar->bar,offset,total,filename);
 }
+
+void quit_progress_bar(){
+    if(tty_fd != STDIN_FILENO){
+        close(tty_fd);
+    }
+}

display_bar.h

@@ -13,6 +13,8 @@ void unlock_scrolled();
 
 void ready_progress_bar();
 
+void quit_progress_bar();
+
 void add_scrolled_unlocked(unsigned int i);
 
 raw_progress_bar_t create_raw_progress_bar();