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如题

要求：建立两个任务taskId1和taskId2,taskId1发送一个字符给taskId2,taskId2接收这个字符并且把该字符写入一个文件，然后发确认信息给taskId1，taskId1接到确认信息后，读上面那个文件，并打印到显示器，然后继续发一个字符给taskId2,这个循环持续不断
环境：Vxworks,Tornado2.2
程序
#include "VxWorks.h"
#include "taskLib.h"
#include "msgQLib.h"
#include "stdio.h"
#include "selectLib.h"
#include "sysLib.h"
#include "ioLib.h"
#include "stdlib.h"
#include "string.h"

char MSG;

void TASK1(void);
void TASK2(void);

int FD;
int taskId1,taskId2;

MSG_Q_ID msgQId1,msgQId2;

char buffer1[50],buffer2[50],buffer3[50];


STATUS progStart (void)
{
taskId1 = taskSpawn("task1",120,0,10240,(FUNCPTR)TASK1,0,0,0,0,0,0,0,0,0,0);
taskId2 = taskSpawn("task2",110,0,10240,(FUNCPTR)TASK2,0,0,0,0,0,0,0,0,0,0);
msgQId1 = msgQCreate(20,50,MSG_Q_FIFO);
msgQId2 = msgQCreate(20,50,MSG_Q_FIFO);
FD = creat("FILE1",O_RDWR);
return (OK);
}

void TASK1(void)
{
printf("Please input a character:");
scanf("%c",&MSG);
msgQSend(msgQId1,&MSG,sizeof(MSG),WAIT_FOREVER,MSG_PRI_NORMAL);
taskResume(taskId2);
taskSuspend(taskId1);
if(msgQReceive(msgQId2,buffer2,50,WAIT_FOREVER)=='o')
{
read(FD,buffer3,1);
printf("%s",buffer3);

}
taskRestart(taskId1);
}

void TASK2(void)
{
if(msgQReceive(msgQId1,buffer1,50,WAIT_FOREVER)!=ERROR);
{
char MSG1='o';
write(FD,buffer1,1);
printf("The char received is: %s",buffer1);
msgQSend(msgQId2,&MSG1,sizeof(MSG1),50,MSG_PRI_NORMAL);
taskResume(taskId1);
taskSuspend(taskId2);
}
taskRestart(taskId2);
}

void progStop (void)
{
taskDelete (taskId1);
taskDelete (taskId2);
msgQDelete(msgQId1);
msgQDelete(msgQId2);
printf ("BYE!
");
}

新人初学嵌入式，就遇到 voip的项目，请各位达人多指教了，谢谢，另外请推荐些嵌入式概念方面的电子书或书籍