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lock3.c
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lock3.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#define N 100
#define CT 4
struct params {
int* p_buffer;
int id;
};
pthread_mutex_t mutex;
pthread_cond_t cond;
int g_count = 0;
void* function1(void* p_args)
{
int* p = (int*)p_args;
// 一共向buffer中添加了N个数字
for (int i = 0; i < N; i++)
{
pthread_mutex_lock(&mutex);
*(p + g_count) = g_count;
g_count++;
printf("Producer Thread add elemnet %d\n", g_count - 1);
if (g_count == 1)
{
pthread_cond_broadcast(&cond);
}
pthread_mutex_unlock(&mutex);
}
return p_args;
}
void* function2(void* p_args)
{
struct params *p = (struct params *)p_args;
int remain = N / CT;
while (remain != 0)
{
pthread_mutex_lock(&mutex);
while (g_count == 0)
{
printf("Consumer %d thread sleep, remain %d elements\n", p->id, remain);
pthread_cond_wait(&cond, &mutex);
printf("Consumer %d thread wake up, remain %d elements\n", p->id, remain);
}
// g_count > 0 说明buffer中有需要处理的值
p->p_buffer[--g_count] = -1;
printf("Consumer %d Thread delete element %d\n", p->id, g_count);
--remain;
pthread_mutex_unlock(&mutex);
}
printf("Consumer %d Thread exit...\n", p->id);
return p_args;
}
int main(void)
{
pthread_t producer;
pthread_t consumer[CT];
struct params data[CT];
int* p_buffer = (int*)malloc(sizeof(int) * N);
void* p_f1_ret = NULL;
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&cond, NULL);
for (int i = 0; i < CT; i++)
{
data[i].p_buffer = p_buffer;
data[i].id = i;
}
for (size_t i = 0; i < CT; i++)
{
pthread_create(&consumer[i], NULL, function2, (void*)&data[i]);
}
sleep(1);
pthread_create(&producer, NULL, function1, (void*)p_buffer);
for (size_t i = 0; i < CT; i++)
{
void* p_f2_ret = NULL;
pthread_join(consumer[i], &p_f2_ret);
}
pthread_join(producer, &p_f1_ret);
pthread_cond_destroy(&cond);
pthread_mutex_destroy(&mutex);
free(p_buffer);
return 0;
}