解释1:你可以把数据放到队列，每次采集到数据就放入队列，这样后面采集的，就是新增到队列，而分析线程等就是到队列中一个个读取。
解释2：
仅供参考：
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//循环向a函数每次发送200个字节长度（这个是固定的）的buffer,
//a函数中需要将循环传进来的buffer，组成240字节（也是固定的）的新buffer进行处理，
//在处理的时候每次从新buffer中取两个字节打印
#ifdef _MSC_VER
#pragma warning(disable:4996)
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifdef _MSC_VER
#include <windows.h>
#include <process.h>
#include <io.h>
#define MYVOID
void
#define vsnprintf _vsnprintf
#else
#include <unistd.h>
#include <sys/
time
.h>
#include <pthread.h>
#define CRITICAL_SECTION pthread_mutex_t
#define MYVOID
void
*
#endif
//Log{
#define MAXLOGSIZE 20000000
#define MAXLINSIZE 16000
#include <time.h>
#include <sys/timeb.h>
#include <stdarg.h>
char
logfilename1[]=
"MyLog1.log"
;
char
logfilename2[]=
"MyLog2.log"
;
static
char
logstr[MAXLINSIZE+1];
char
datestr[16];
char
timestr[16];
char
mss[4];
CRITICAL_SECTION cs_log;
FILE
*flog;
#ifdef _MSC_VER
void
Lock(CRITICAL_SECTION *l) {
EnterCriticalSection(l);
}
void
Unlock(CRITICAL_SECTION *l) {
LeaveCriticalSection(l);
}
void
sleep_ms(
int
ms) {
Sleep(ms);
}
#else
void
Lock(CRITICAL_SECTION *l) {
pthread_mutex_lock(l);
}
void
Unlock(CRITICAL_SECTION *l) {
pthread_mutex_unlock(l);
}
void
sleep_ms(
int
ms) {
usleep(ms*1000);
}
#endif
void
LogV(
const
char
*pszFmt,
va_list
argp) {
struct
tm
*now;
struct
timeb tb;
if
(NULL==pszFmt||0==pszFmt[0])
return
;
vsnprintf(logstr,MAXLINSIZE,pszFmt,argp);
ftime(&tb);
now=
localtime
(&tb.
time
);
sprintf
(datestr,
"%04d-%02d-%02d"
,now->tm_year+1900,now->tm_mon+1,now->tm_mday);
sprintf
(timestr,
"%02d:%02d:%02d"
,now->tm_hour ,now->tm_min ,now->tm_sec );
sprintf
(mss,
"%03d"
,tb.millitm);
printf
(
"%s %s.%s %s"
,datestr,timestr,mss,logstr);
flog=
fopen
(logfilename1,
"a"
);
if
(NULL!=flog) {
fprintf
(flog,
"%s %s.%s %s"
,datestr,timestr,mss,logstr);
if
(
ftell
(flog)>MAXLOGSIZE) {
fclose
(flog);
if
(
rename
(logfilename1,logfilename2)) {
remove
(logfilename2);
rename
(logfilename1,logfilename2);
}
}
else
{
fclose
(flog);
}
}
}
void
Log(
const
char
*pszFmt,...) {
va_list
argp;
Lock(&cs_log);
va_start
(argp,pszFmt);
LogV(pszFmt,argp);
va_end
(argp);
Unlock(&cs_log);
}
//Log}
#define ASIZE 200
#define BSIZE 240
#define CSIZE 2
char
Abuf[ASIZE];
char
Cbuf[CSIZE];
CRITICAL_SECTION cs_HEX;
CRITICAL_SECTION cs_BBB;
struct
FIFO_BUFFER {
int
head;
int
tail;
int
size;
char
data[BSIZE];
} BBB;
int
No_Loop=0;
void
HexDump(
int
cn,
char
*buf,
int
len) {
int
i,j,k;
char
binstr[80];
Lock(&cs_HEX);
for
(i=0;i<len;i++) {
if
(0==(i%16)) {
sprintf
(binstr,
"%03d %04x -"
,cn,i);
sprintf
(binstr,
"%s %02x"
,binstr,(unsigned
char
)buf[i]);
}
else
if
(15==(i%16)) {
sprintf
(binstr,
"%s %02x"
,binstr,(unsigned
char
)buf[i]);
sprintf
(binstr,
"%s "
,binstr);
for
(j=i-15;j<=i;j++) {
sprintf
(binstr,
"%s%c"
,binstr,(
'!'
<buf[j]&&buf[j]<=
'~'
)?buf[j]:
'.'
);
}
Log(
"%s\n"
,binstr);
}
else
{
sprintf
(binstr,
"%s %02x"
,binstr,(unsigned
char
)buf[i]);
}
}
if
(0!=(i%16)) {
k=16-(i%16);
for
(j=0;j<k;j++) {
sprintf
(binstr,
"%s "
,binstr);
}
sprintf
(binstr,
"%s "
,binstr);
k=16-k;
for
(j=i-k;j<i;j++) {
sprintf
(binstr,
"%s%c"
,binstr,(
'!'
<buf[j]&&buf[j]<=
'~'
)?buf[j]:
'.'
);
}
Log(
"%s\n"
,binstr);
}
Unlock(&cs_HEX);
}
int
GetFromRBuf(
int
cn,CRITICAL_SECTION *cs,
struct
FIFO_BUFFER *fbuf,
char
*buf,
int
len) {
int
lent,len1,len2;
lent=0;
Lock(cs);
if
(fbuf->size>=len) {
lent=len;
if
(fbuf->head+lent>BSIZE) {
len1=BSIZE-fbuf->head;
memcpy
(buf ,fbuf->data+fbuf->head,len1);
len2=lent-len1;
memcpy
(buf+len1,fbuf->data ,len2);
fbuf->head=len2;
}
else
{
memcpy
(buf ,fbuf->data+fbuf->head,lent);
fbuf->head+=lent;
}
fbuf->size-=lent;
}
Unlock(cs);
return
lent;
}
MYVOID thdB(
void
*pcn) {
char
*recv_buf;
int
recv_nbytes;
int
cn;
int
wc;
int
pb;
cn=(
int
)pcn;
Log(
"%03d thdB thread begin...\n"
,cn);
while
(1) {
sleep_ms(10);
recv_buf=(
char
*)Cbuf;
recv_nbytes=CSIZE;
wc=0;
while
(1) {
pb=GetFromRBuf(cn,&cs_BBB,&BBB,recv_buf,recv_nbytes);
if
(pb) {
Log(
"%03d recv %d bytes\n"
,cn,pb);
HexDump(cn,recv_buf,pb);
sleep_ms(1);
}
else
{
sleep_ms(1000);
}
if
(No_Loop)
break
;
//
wc++;
if
(wc>3600) Log(
"%03d %d==wc>3600!\n"
,cn,wc);
}
if
(No_Loop)
break
;
//
}
#ifndef _MSC_VER
pthread_exit(NULL);
#endif
}
int
PutToRBuf(
int
cn,CRITICAL_SECTION *cs,
struct
FIFO_BUFFER *fbuf,
char
*buf,
int
len) {
int
lent,len1,len2;
Lock(cs);
lent=len;
if
(fbuf->size+lent>BSIZE) {
lent=BSIZE-fbuf->size;
}
if
(fbuf->tail+lent>BSIZE) {
len1=BSIZE-fbuf->tail;
memcpy
(fbuf->data+fbuf->tail,buf ,len1);
len2=lent-len1;
memcpy
(fbuf->data ,buf+len1,len2);
fbuf->tail=len2;
}
else
{
memcpy
(fbuf->data+fbuf->tail,buf ,lent);
fbuf->tail+=lent;
}
fbuf->size+=lent;
Unlock(cs);
return
lent;
}
MYVOID thdA(
void
*pcn) {
char
*send_buf;
int
send_nbytes;
int
cn;
int
wc;
int
a;
int
pa;
cn=(
int
)pcn;
Log(
"%03d thdA thread begin...\n"
,cn);
a=0;
while
(1) {
sleep_ms(100);
memset
(Abuf,a,ASIZE);
a=(a+1)%256;
if
(16==a) {No_Loop=1;
break
;}
//去掉这句可以让程序一直循环直到按Ctrl+C或Ctrl+Break或当前目录下存在文件No_Loop
send_buf=(
char
*)Abuf;
send_nbytes=ASIZE;
Log(
"%03d sending %d bytes\n"
,cn,send_nbytes);
HexDump(cn,send_buf,send_nbytes);
wc=0;
while
(1) {
pa=PutToRBuf(cn,&cs_BBB,&BBB,send_buf,send_nbytes);
Log(
"%03d sent %d bytes\n"
,cn,pa);
HexDump(cn,send_buf,pa);
send_buf+=pa;
send_nbytes-=pa;
if
(send_nbytes<=0)
break
;
//
sleep_ms(1000);
if
(No_Loop)
break
;
//
wc++;
if
(wc>3600) Log(
"%03d %d==wc>3600!\n"
,cn,wc);
}
if
(No_Loop)
break
;
//
}
#ifndef _MSC_VER
pthread_exit(NULL);
#endif
}
int
main() {
#ifdef _MSC_VER
InitializeCriticalSection(&cs_log);
InitializeCriticalSection(&cs_HEX);
InitializeCriticalSection(&cs_BBB);
#else
pthread_t threads[2];
int
threadsN;
int
rc;
pthread_mutex_init(&cs_log,NULL);
pthread_mutex_init(&cs_HEX,NULL);
pthread_mutex_init(&cs_BBB,NULL);
#endif
Log(
"Start===========================================================\n"
);
BBB.head=0;
BBB.tail=0;
BBB.size=0;
#ifdef _MSC_VER
_beginthread((
void
(__cdecl *)(
void
*))thdA,0,(
void
*)1);
_beginthread((
void
(__cdecl *)(
void
*))thdB,0,(
void
*)2);
#else
threadsN=0;
rc=pthread_create(&(threads[threadsN++]),NULL,thdA,(
void
*)1);
if
(rc) Log(
"%d=pthread_create %d error!\n"
,rc,threadsN-1);
rc=pthread_create(&(threads[threadsN++]),NULL,thdB,(
void
*)2);
if
(rc) Log(
"%d=pthread_create %d error!\n"
,rc,threadsN-1);
#endif
if
(!access(
"No_Loop"
,0)) {
remove
(
"No_Loop"
);
if
(!access(
"No_Loop"
,0)) {
No_Loop=1;
}
}
while
(1) {
sleep_ms(1000);
if
(No_Loop)
break
;
//
if
(!access(
"No_Loop"
,0)) {
No_Loop=1;
}
}
sleep_ms(3000);
Log(
"End=============================================================\n"
);
#ifdef _MSC_VER
DeleteCriticalSection(&cs_BBB);
DeleteCriticalSection(&cs_HEX);
DeleteCriticalSection(&cs_log);
#else
pthread_mutex_destroy(&cs_BBB);
pthread_mutex_destroy(&cs_HEX);
pthread_mutex_destroy(&cs_log);
#endif
return
0;
}
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任何收发两端速度不一致的通讯，都需要在它们之间使用一个足够大的FIFO缓冲区。
对任何FIFO缓冲区的使用，都需要仔细考虑接收端接收时超时无数据和发送端发送时FIFO缓冲区已满这两种情况下该如何做。
这些概念都在这段经典代码中有所体现。
这段经典代码还包括以下必须考虑的因素：
◆跨Windows和Linux平台
◆多线程锁
◆多线程日志
◆日志文件占用的磁盘空间可控
◆日志中的时间包括毫秒
◆传输的数据对应的每个字节到底是几
◆如何退出多线程程序
◆……
转：https://bbs.csdn.net/topics/392217131?page=1