From e7846b374d25716d35eb49e7235ddd36e22299a7 Mon Sep 17 00:00:00 2001
From: Ed Gonzalez <ed.gonzalez@flex-radio.com>
Date: Thu, 15 Jan 2015 09:52:29 -0600
Subject: [PATCH] Add shutdown semaphore for termination instead of endless
 loop

---
 DSP_API/main.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/DSP_API/main.c b/DSP_API/main.c
index 7313eef..74120c7 100644
--- a/DSP_API/main.c
+++ b/DSP_API/main.c
@@ -61,6 +61,8 @@
 const char* APP_NAME = "FreeDV";            // Name of Application
 const char* CFG_FILE = "/home/root/FreeDV.cfg";        // Name of associated configuration file
 
+static sem_t shutdown_sem;
+
 /* This structure mirrors the one found in /usr/include/asm/ucontext.h */
 typedef struct _sig_ucontext {
 	unsigned long     uc_flags;
@@ -124,16 +126,20 @@ void setup_segfault_handler(void)
 // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 // 	main()
 
-int main(void) {
+int main(void)
+{
+
+	/* Semaphore will be used to signal end of execution */
+	sem_init(&shutdown_sem, 0, 0);
 
 	setup_segfault_handler();
+
     SmartSDR_API_Init();
 
-    while(1) {
-    	usleep(100000);
-    }
+    /* Wait to be notified of shutdown */
+    sem_wait(&shutdown_sem);
 
-    return 1;
+    return 0;
 }