From 0e673c44e65783cdbde6f7e7a3968f8608cc5872 Mon Sep 17 00:00:00 2001
From: jiskra <i@jiskra.net>
Date: Sat, 10 Jun 2017 13:30:45 +0800
Subject: [PATCH] =?UTF-8?q?=E9=98=85=E8=AF=BB=E4=BB=A3=E7=A0=81=E5=A2=9E?=
 =?UTF-8?q?=E5=8A=A0=E7=9A=84=E6=B3=A8=E9=87=8A?=
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---
 dump1090.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dump1090.c b/dump1090.c
index 698a1a7..2f73d14 100644
--- a/dump1090.c
+++ b/dump1090.c
@@ -340,6 +340,7 @@ void modesInitRTLSDR(void) {
 
     device_count = rtlsdr_get_device_count();
     if (!device_count) {
+        }
         fprintf(stderr, "No supported RTLSDR devices found.\n");
         exit(1);
     }
@@ -399,10 +400,10 @@ void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) {
      * on the start of the new buffer. */
     memcpy(Modes.data, Modes.data+MODES_DATA_LEN, (MODES_FULL_LEN-1)*4);
     /* Read the new data. */
-    memcpy(Modes.data+(MODES_FULL_LEN-1)*4, buf, len);
+    memcpy(Modes.data+(MODES_FULL_LEN-1)*4, buf, len);//memcpy（*dest，*src,LEN）
     Modes.data_ready = 1;
     /* Signal to the other thread that new data is ready */
-    pthread_cond_signal(&Modes.data_cond);
+    pthread_cond_signal(&Modes.data_cond); //pthread_cond_signal函数的作用是发送一个信号给另外一个处于阻塞状态的线程，使其脱离阻塞状态继续执行。
     pthread_mutex_unlock(&Modes.data_mutex);
 }