生产者消费者模型模版

#include <stdio.h>
#include <pthread.h>
#include <segypkg.h>

pthread_cond_t notEmpty=PTHREAD_COND_INITIALIZER;
pthread_cond_t notFull =PTHREAD_COND_INITIALIZER;
pthread_mutex_t mutex  =PTHREAD_MUTEX_INITIALIZER;
int full=0;
int empty=1;
int iadd=0;
int iremove=0; 

int n;
int n1,n2;

int nsum;

#define NELEM 100

int list[NELEM];

void *io_thread(void *arg);
void *sum_thread(void *arg);

segy trio,tr1,tr2;
double dtr1[2000],dtr2[2000];
unsigned char *buf;
int trsz=(sizeof(float)*2000+240);

typedef struct
{
int id;
int *result;
}sum_thread_t;

int main(int argc,char *argv[])
{
    pthread_t tio;
    pthread_t t1,t2;
    
    double ret,c1;
    
    sum_thread_t tt1,tt2;
    
    int it;
    FILE *fp;
    
    memset(dtr1,0,sizeof(double)*2000);
    memset(dtr2,0,sizeof(double)*2000);
    
    buf=(unsigned char*)malloc(  trsz*NELEM  );
    
    tt1.id=0;
    tt2.id=1;
    
    pthread_create(&tio,NULL,io_thread,NULL);

    pthread_create(&t1,NULL,sum_thread,&tt1);
    pthread_create(&t2,NULL,sum_thread,&tt2);
    
    pthread_join(tio,NULL);
    pthread_join(t1,NULL);
    pthread_join(t2,NULL);
    
    printf("here");
    
    /* get final sum */
    for (it=0;it<2000;++it)
    {
        dtr1[it]+=dtr2[it];
    }
    
    memset(&tr2,0,sizeof(tr2));
    memset(dtr2,0,sizeof(double)*2000);
    fp=fopen("crp.L1000.su","rb");
    while(fgettr(fp,&trio))
    {
        for (it=0;it<2000;++it)
        {
            dtr2[it]+=trio.data[it];
        }
    }
    fclose(fp);
    
    ret=0.0;
    for (it=0;it<2000;++it)
    {
        c1=dtr1[it]-dtr2[it];
        ret+=(c1*c1);
    }
    
    printf("n= %d ret=%lf nsum=%d n1=%d n2=%d\n",n,ret,nsum,n1,n2);
}

void *io_thread(void *arg)
{
    printf("in io\n");
    int ipill;
    
    FILE *fp;
    
    fp=fopen("crp.L1000.su","rb");
    
    while (fgettr(fp,&trio))
    {
        n++;
        
        pthread_mutex_lock(&mutex);
        while(full)
        {
            pthread_cond_wait(&notFull,&mutex);
        }
        
        
        empty=0;
        
        list[iadd]=1;
        
        memcpy(&buf[trsz*iadd],&trio,trsz);
        
        iadd++;
        if (iadd==NELEM)
            iadd=0;
        
        if (iadd==iremove)
            full=1;
        
        pthread_mutex_unlock(&mutex);
        pthread_cond_signal(&notEmpty);    
    }
    fclose(fp);
    for (ipill=0;ipill<2;++ipill)
    {
        pthread_mutex_lock(&mutex);
        while(full)
        {
            pthread_cond_wait(&notFull,&mutex);
        }
        
        empty=0;
        
        list[iadd]=-1;
        
        //memcpy(&buf[trsz*iadd],&trio,trsz);
        
        iadd++;
        if (iadd==NELEM)
            iadd=0;
        
        if (iadd==iremove)
            full=1;
        
        pthread_mutex_unlock(&mutex);
        pthread_cond_signal(&notEmpty);    
    }
    
    printf("end io\n");
    
}

void *sum_thread(void *arg)
{
    segy tr;
    int flag=0;
    
    sum_thread_t *p=(sum_thread_t*)arg;
    
    int id=p->id;
    int *result=p->result;
    int it;
    
    printf("in thread %d tr=%p\n",id,&tr);
    while (1)
    {
        pthread_mutex_lock(&mutex);
        while(empty)
        {
            pthread_cond_wait(&notEmpty,&mutex);
        }
        
        full=0;
        flag=0;
        if (list[iremove]==-1)
        {
            flag=1;
        }
        
        if (list[iremove]==1)
        {
            nsum++;
            list[iremove]=0;
        }
        
        memcpy(&tr,&buf[iremove*trsz],trsz);
        
        iremove++;
        if (iremove==NELEM)
        {
            iremove=0;
        }
        
        if (iremove==iadd)
        {
            empty=1;
        }
        
        pthread_mutex_unlock(&mutex);
        pthread_cond_signal(&notFull);
        
        if (flag==1)
        {
            break;
        }
        
        if (id==0)
            n1++;
        if (id==1)
            n2++;
        
        for (it=0;it<2000;++it)
        {
            if (id==0)
                dtr1[it]+=tr.data[it];
            if (id==1)
                dtr2[it]+=tr.data[it];
        }
        
    }    
    printf("end thread %d\n",id);
}

求和道用 double 如果用 float 那就有误差了，这个害我调试了整整一天。

来源：https://www.cnblogs.com/reedlau/p/4966371.html