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阅读代码增加的注释

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jiskra 2017-06-10 13:30:45 +08:00
parent a474281377
commit 0e673c44e6
1 changed files with 3 additions and 2 deletions
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dump1090.c
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@ -340,6 +340,7 @@ void modesInitRTLSDR(void) {
device_count = rtlsdr_get_device_count(); device_count = rtlsdr_get_device_count();
if (!device_count) { if (!device_count) {
}
fprintf(stderr, "No supported RTLSDR devices found.\n"); fprintf(stderr, "No supported RTLSDR devices found.\n");
exit(1); exit(1);
} }
@ -399,10 +400,10 @@ void rtlsdrCallback(unsigned char *buf, uint32_t len, void *ctx) {
* on the start of the new buffer. */ * on the start of the new buffer. */
memcpy(Modes.data, Modes.data+MODES_DATA_LEN, (MODES_FULL_LEN-1)*4); memcpy(Modes.data, Modes.data+MODES_DATA_LEN, (MODES_FULL_LEN-1)*4);
/* Read the new data. */ /* 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; Modes.data_ready = 1;
/* Signal to the other thread that new data is ready */ /* 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); pthread_mutex_unlock(&Modes.data_mutex);
} }