| 通信用虚拟实时操作系统： rtos_os |
以下代码就是一个典型的通信用实时操作系统：rtos_os，它支持平台 Windows、Linux、Unix、VxWorks等。它主要基于 GNU 编译器。
数据类型：
typedef unsigned char UINT8; /*headed with uc*/
typedef unsigned short UINT16; /*headed with us*/
typedef unsigned int UINT32; /*headed with ul*/
typedef unsigned char BOOLEAN; /*headed with b*/
#define NULL 0
基本操作系统函数：
/*memory management*/
void* rtosAllocMemory(UINT32 ulLength);
void rtosFreeMemory(void* pBuffer);
void rtosCopyMemory(void* pFrom, void* pTo, UINT32 ulLength);
void rtosFillMemory(void* pBuffer, UINT32 ulLength, UINT8 ucValue);
/*timer amangement*/
#define INVALID_TIMER_ID 0
UINT32 rtosCreateTimer(UINT8 ucMid, UINT8 ucTimerType, UINT32 ulTimerLength);
void rtosDeleteTimer(UINT32 ulTimerId);
/*message management*/
void rtosSendMsg(void* pMsg);
void rtosDoMessage();
/*system function*/
UINT16 rtosRead16(UINT16 usOld);
UINT32 rtosRead32(UINT32 ulOld);
UINT16 rtosWrite16(UINT16 usOld);
UINT32 rtosWrite32(UINT32 ulOld);
/*debug support*/
void rtosPrint(const char *pFormat, UINT32 *pValue);
通信系统模型（以 GPRS 为例）：
typedef enum
{
GPRS_MID_RF, /*RF layer*/
GPRS_MID_MAC, /*MAC layer*/
GPRS_MID_RLC, /*RLC layer*/
GPRS_MID_LLC, /*LLC layer*/
GPRS_MID_SNDC, /*SNDC layer*/
GPRS_MID_IP, /*IP layer*/
GPRS_MID_SIM, /*SIM card*/
}GPRS_MID_TYPE;
/*GPRS module APIs*/
extern void initGprsRf();
extern void onGprsRfMsg(GPRS_MSG_TYPE* pMsg);
extern void onGprsRfTimer(UINT8 ucTimerType);
extern void initGprsMac();
extern void onGprsMacMsg(GPRS_MSG_TYPE* pMsg);
extern void onGprsMacTimer(UINT8 ucTimerType);
extern void initGprsIp();
extern void onGprsIpMsg(GPRS_MSG_TYPE* pMsg);
extern void onGprsIpTimer(UINT8 ucTimerType);
/*GPRS APIs*/
void initGprs();
void onGprsMsg(GPRS_MSG_TYPE* pMsg);
void onGprsTimer(UINT32 ulValue);
条件编译选项：
/*os macro*/
/*#define LINUX_VERSION*/
/*#define UNIX_VERSION*/
#define VXWORKS_VERSION
/*#define WINDOWS_VERSION*/
/*compile tool macro*/
#define GNU_VERSION
/*debug version macro*/
#define DEBUG_VERSION